register gallery
 

Go Back   Mazdaspeed Forums >
MAZDASPEED SECTION
>
Mazdaspeed 3/6 MZR Gen1 Forums (2006-2009)
> MazdaSpeed 3/6 - Turbo Induction

MazdaSpeed 3/6 - Turbo Induction MazdaSpeed 3/6 - Turbo Induction - Have a turbo, intercooler, downpipe question? Anything turbo related belongs here!


Welcome to Mazdaspeed Forums .

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

*When you join MSF as a registered user, there will be No Ads.

*Registered Members get access to the Off Topic Area of the Forum

*Registered Members have an opportunity to upgrade their accounts to VIP, which brings a host of goddies for supporting MSF such as Raffles, Additional Forum Access, More PM Storage, The ability to upload more Images and many other enhancements.

*Registered members also get access to the live chat box!
Like Tree1Likes
  • 1 Post By MSMS3
Reply
 
Bookmark and Share LinkBack Thread Tools Search this Thread Display Modes
 Old 08-15-2019, 04:03 AM   #1
 
BR1JZL's Avatar
 
Join Date: Jan 2019
Location: Straya
Posts: 22   (View Stats)
iTrader: (0)
Rep Power: 0
BR1JZL has a spectacular aura aboutBR1JZL has a spectacular aura aboutBR1JZL has a spectacular aura about
Thanks: 7
Thanked 4 Times in 4 Posts
Groans: 0
Groaned at 0 Times in 0 Posts
(Thread Starter)
Not Ranked  0 score     
Default Boost Leak Test Correctly?

Hi all,

So I am wanting to make sure that I am doing a boost leak test correctly, as I have been having a lack of power issue.

I have made a basic boost leak tester which goes into the stock intake (post MAF) and has a tyre valve and boost gauge. I then block the line going to the rocker cover and regulate the air compressor to 25psi. I have not blocked off the throttle body or anything else.

When I try to connect compressed air or even a smoke tester, there are no leaks to be found, but the pressure doesn't hold.

I even tried this method: how to find boost leaks, guaranteed

Am I missing something or doing this incorrectly?
__________________
Mods slowly coming along!!!! Autotech HPFP, CircuitWerks Down/Testpipe, Cobb Accessport V2 and a CPE Turbo Inlet Pipe (Waiting to put it on)

Last edited by BR1JZL; 08-15-2019 at 04:36 AM. Reason: Additional Information
BR1JZL is offline   Reply With Quote
 Old 08-15-2019, 04:33 AM   #2
 
BR1JZL's Avatar
 
Join Date: Jan 2019
Location: Straya
Posts: 22   (View Stats)
iTrader: (0)
Rep Power: 0
BR1JZL has a spectacular aura aboutBR1JZL has a spectacular aura aboutBR1JZL has a spectacular aura about
Thanks: 7
Thanked 4 Times in 4 Posts
Groans: 0
Groaned at 0 Times in 0 Posts
(Thread Starter)
Not Ranked  0 score     
Default

Also to give some background, I have a stock intake, but a downpipe, Autotech HPFP, and a Cobb AP V2 and Corksport BPV. Other work done includes JBR TIG for TB and Intake, valves have been cleaned, 1 step colder Denso plugs, new NTK O2 sensors, fuel pressure regulator valve, Toyota injector seals, all clamps changed to solid band hose clamps, PCV Valve and Damond EGR Block off. The previous owner had changed the timing chain, VVT Acuator and removed and polished the crankshaft with new race bearings.

When I have started the car today and taken it for a drive, the FT was around -11 at idle on stock tune and if changed to a Stage 1+ MAP, FT changed to -15. So thought I would do a MAF calibration, but I was watching the AFR and at cruising, it went as high as 32, with a 28 constant, but no Knock. So to avoid ZZB it is on jacks in the garage, so I won't be able to get a datalog.
__________________
Mods slowly coming along!!!! Autotech HPFP, CircuitWerks Down/Testpipe, Cobb Accessport V2 and a CPE Turbo Inlet Pipe (Waiting to put it on)
BR1JZL is offline   Reply With Quote
 Old 08-15-2019, 05:58 AM   #3
Police - Grammarhead
 
Vansquish's Avatar
 
Join Date: Sep 2009
Location: Metro Detroit, MI
Posts: 6,185
iTrader: (1)
Rep Power: 3682
Vansquish is the leader of the worldVansquish is the leader of the worldVansquish is the leader of the worldVansquish is the leader of the worldVansquish is the leader of the worldVansquish is the leader of the worldVansquish is the leader of the worldVansquish is the leader of the worldVansquish is the leader of the worldVansquish is the leader of the worldVansquish is the leader of the world
Thanks: 8,639
Thanked 6,941 Times in 2,755 Posts
Groans: 1,894
Groaned at 45 Times in 26 Posts
Default

If your car is pulling fuel on both the stock tune and on the Stage 1+ map at idle, that means your car is running rich at idle. That means that you've probably got a substantial boost leak. That is, air is escaping from the system before passing into the engine, and the exhaust constituents are low in oxygen. Thus, the O2 sensors would report a rich running condition.

Given that you say you're running 28-32:1 AFR at cruise, I'm a little confused though.
As far as I'm aware, the leanest possible AFR is 29.3:1. I want to see the data supporting your statements.

Do you have any datalogs showing your car's symptoms? If so, please post them here.
__________________
Having trouble finding something on MSF? Use MS3Shadow's search tool:SEARCH MSF HERE!

Vansquish is offline   Reply With Quote
The Following User Says Thank You to Vansquish For This Useful Post:
BR1JZL (08-16-2019)
 Old 08-15-2019, 02:18 PM   #4
 
BR1JZL's Avatar
 
Join Date: Jan 2019
Location: Straya
Posts: 22   (View Stats)
iTrader: (0)
Rep Power: 0
BR1JZL has a spectacular aura aboutBR1JZL has a spectacular aura aboutBR1JZL has a spectacular aura about
Thanks: 7
Thanked 4 Times in 4 Posts
Groans: 0
Groaned at 0 Times in 0 Posts
(Thread Starter)
Not Ranked  0 score     
Default

Thanks for the response, for the datalog, my fiance was checking the AP, so I am going off her numbers, but I will get back later and take a datalog and post up.

In the mean time, is the way I am doing the boost leak test right? I can't even hear any air escaping.
__________________
Mods slowly coming along!!!! Autotech HPFP, CircuitWerks Down/Testpipe, Cobb Accessport V2 and a CPE Turbo Inlet Pipe (Waiting to put it on)
BR1JZL is offline   Reply With Quote
 Old 08-15-2019, 02:55 PM   #5
 
whatsabrooklyn's Avatar
 
Join Date: May 2015
Posts: 110   (View Stats)
iTrader: (0)
Rep Power: 0
whatsabrooklyn is a splendid one to beholdwhatsabrooklyn is a splendid one to beholdwhatsabrooklyn is a splendid one to beholdwhatsabrooklyn is a splendid one to beholdwhatsabrooklyn is a splendid one to beholdwhatsabrooklyn is a splendid one to beholdwhatsabrooklyn is a splendid one to beholdwhatsabrooklyn is a splendid one to behold
Thanks: 39
Thanked 19 Times in 17 Posts
Groans: 0
Groaned at 5 Times in 4 Posts
Not Ranked  0 score     
Default

Understanding Fuel Trims & Using Them To Detect Leaks

so i was reading this and i think it may apply... so post turbo leak to the throttle body can make it rich under vacuum, correct? @Vansquish;

also a exhaust leak throw off #'s as well, right?

Last edited by whatsabrooklyn; 08-15-2019 at 03:31 PM.
whatsabrooklyn is offline   Reply With Quote
The Following User Says Thank You to whatsabrooklyn For This Useful Post:
BR1JZL (08-16-2019)
 Old 08-16-2019, 04:35 AM   #6
 
BR1JZL's Avatar
 
Join Date: Jan 2019
Location: Straya
Posts: 22   (View Stats)
iTrader: (0)
Rep Power: 0
BR1JZL has a spectacular aura aboutBR1JZL has a spectacular aura aboutBR1JZL has a spectacular aura about
Thanks: 7
Thanked 4 Times in 4 Posts
Groans: 0
Groaned at 0 Times in 0 Posts
(Thread Starter)
Not Ranked  0 score     
Default

Hey all, wanted to update, I watched the AP this time and the AFR stayed around 14.7 at cruising, didn't go higher than 29.3 under acceleration, the only is the LTFT's, even at idle it is around -18 (datalog attached). I also tried to get a 3rd gear WOT datalog, for some reason on the AP it shows as been 99% for throttle position and a max of 12PSI, but on the datalog it shows 70% throttle position :/ (also attached). I have also attached a 2nd gear MAF Calibration datalog, pretty much had to hit redline to get 100g/s. This is all on a Stage 1+ MAP
Attached Files
File Type: csv IDLE Fuel Trims.csv (4.7 KB, 3 views)
File Type: csv 3rd Gear WOT.csv (16.8 KB, 6 views)
File Type: csv MAF Cal.csv (33.8 KB, 2 views)
__________________
Mods slowly coming along!!!! Autotech HPFP, CircuitWerks Down/Testpipe, Cobb Accessport V2 and a CPE Turbo Inlet Pipe (Waiting to put it on)

Last edited by BR1JZL; 08-16-2019 at 04:36 AM. Reason: Additional Information
BR1JZL is offline   Reply With Quote
 Old 08-16-2019, 05:39 AM   #7
Police - Grammarhead
 
Vansquish's Avatar
 
Join Date: Sep 2009
Location: Metro Detroit, MI
Posts: 6,185
iTrader: (1)
Rep Power: 3682
Vansquish is the leader of the worldVansquish is the leader of the worldVansquish is the leader of the worldVansquish is the leader of the worldVansquish is the leader of the worldVansquish is the leader of the worldVansquish is the leader of the worldVansquish is the leader of the worldVansquish is the leader of the worldVansquish is the leader of the worldVansquish is the leader of the world
Thanks: 8,639
Thanked 6,941 Times in 2,755 Posts
Groans: 1,894
Groaned at 45 Times in 26 Posts
Default

OK. I've taken a look at your logs, but before I get to them, here are a few comments based on your post only.

1. AFRs of 29.3 should only be occurring when you're off the throttle. That is, they should spike to 29.3 during shifts, but under acceleration your AFRs should be between about 10:1 and 14.7:1 depending on the conditions.

2. Accelerator pedal position (APP) and Throttle position (TP) are not the same thing. It sounds like you are describing APP which can go as high as 99% at WOT, but WOT is only 70%-ish for throttle position.

3. If you're doing a MAF calibration run properly, then you probably won't get to 100g/s until quite close to redline. It's easier to do a MAF calibration log in a higher gear, as loads increase substantially with gear ratios.

4. The OTS maps are almost universally awful. After COBBS V100-series OTS maps, the tunes have all been neutered and weak. I'm not surprised that you're only hitting 13psi.

Now to the datalogs themselves:

1. You are risking serious engine damage the way that you are doing your WOT runs. It is well known that going WOT at very low revs on an undersquare engine is a recipe for bent connecting rods and blown motors. On our platform specifically, there is almost universal agreement that you should NOT go WOT below 3000rpm. Period.

2. At WOT, your car is adding fuel at a substantial rate to try and make AFR targets. That is, you appear to have a pre-turbo, post MAF sensor leak. However, you are hitting your AFR targets at WOT.

Additionally, your extremely short idle log (I mean, really? You expect us to diagnose something in a 3 second-long log?) suggests that your car is running rich at idle the entire time, as the ECU is pulling fuel for the whole log. This suggests that your engine is receiving less air than expected for the amount of fuel being injected.

Since the WOT, MAF Cal and Idle logs all say slightly different things, I would guess that you may just not be using a map that is appropriate for your modifications.

3. Your MAF calibration log seems to support this, as a significant amount of the log, up to around 4200rpm, shows that your ECU is trying to pull fuel to meet AFR targets. That is, you are running rich to that point. Above about 4200 RPM, your car suddenly starts adding fuel to meet AFR targets. You're in vacuum, rather than boost for pretty much the entire time.

If you had a vacuum leak, your car's behavior would likely be a bit different. With a pre-turbo vacuum leak, when your car was in vacuum and under boost, you would be running lean, and the ECU would be adding a bunch of fuel to the mixture. With a post-turbo vacuum leak, when your car was in vacuum you would be running lean, but when your car was in boost, you would be running rich (air would be escaping the system).

Your car has the opposite symptoms. You are running rich in vacuum and lean at WOT. Therefore, it is not a typical pre or post-turbo leak. Accordingly, you probably are running an inappropriate tune.
__________________
Having trouble finding something on MSF? Use MS3Shadow's search tool:SEARCH MSF HERE!

Vansquish is offline   Reply With Quote
The Following User Says Thank You to Vansquish For This Useful Post:
BR1JZL (08-18-2019)
 Old 08-18-2019, 05:47 PM   #8
 
BR1JZL's Avatar
 
Join Date: Jan 2019
Location: Straya
Posts: 22   (View Stats)
iTrader: (0)
Rep Power: 0
BR1JZL has a spectacular aura aboutBR1JZL has a spectacular aura aboutBR1JZL has a spectacular aura about
Thanks: 7
Thanked 4 Times in 4 Posts
Groans: 0
Groaned at 0 Times in 0 Posts
(Thread Starter)
Not Ranked  0 score     
Default

Thank you for your detailed and insightful post, for the actual datalog it is especially great to know not to go WOT under 3k, I have been reading all kinds of conflicting information.

Just in regards to the Boost Leak Test itself, is the method described in the first post correct?

I have seen videos where people have said they can build steady pressure, usually around 15 Psi
__________________
Mods slowly coming along!!!! Autotech HPFP, CircuitWerks Down/Testpipe, Cobb Accessport V2 and a CPE Turbo Inlet Pipe (Waiting to put it on)
BR1JZL is offline   Reply With Quote
 Old 08-18-2019, 06:22 PM   #9
 
MSMS3's Avatar
 
Join Date: Jun 2009
Posts: 2,586   (View Stats)
iTrader: (0)
Rep Power: 1081
MSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the world
Thanks: 1,355
Thanked 1,854 Times in 1,003 Posts
Groans: 144
Groaned at 47 Times in 31 Posts
Not Ranked  0 score     
Default

15.5 psi (ish) is stock peak boost. With your downpipe (what are you doing for a racepipe/midpipe?) and racepipe it will want to build to 18 psi on the stock tune. But that is with dangerous spikes to 22 or more. The stock MAP sensor will max out at 22.5, so you could be higher and not know it. With a proper tune, you’ll see 17-17.5 psi or so peak with taper toward redline.

You need a good midpipe (catless - called a racepipe) as the stock one has a restrictive catalytic converter and is not 3”. It’s ok (actually good) to run the stock CBE because gasses have cooled enough by then that it flows well. But, coming out of the downpipe they are still hot enough that they benefit from a 3” diameter until they cool a bit more.

There is NO confusion about going wide open throttle below 3,000 rpm. Don’t do it if you value your block. Bent and broken connecting rods will help you ventilate it with nice big holes in unwanted locations.
__________________
2017 Audi Q5 3.0 T (supercharged) Stage 2+ EPL tune, JHM overdrive crank pulley, EPL supercharger pulley, ZF8 TCU tune, aFe/034 intake, modified air box. 480 hp.

Sunlight Silver '08 MS3 GT Mods: (Sold 1/25/2019 after 10 years of ownership)
BNR Stage 1 (to fix smoking K04 turbo), TurboXS 3" Catless DP/RP "Stealthback" into stock CBE, Vibrant 3 inch Ultra Quiet Resonator in RP section, Magnaflow 3 1/2" exhaust tip, Mazdaspeed CAI w/air straightener and K&N conical filter, NGK 6510 Iridium IX one step colder plugs, Hypertech tune, Autotech HPFP internals, Stock BPV (works perfectly), Yokohama Advan Neova AD08R's (stock size on stock rims); Hawk HPS pads; SURE RMM; Grimmspeed EBCS (2 port mode), Bilstein B6's, SPC rear camber arms.
MSMS3 is offline   Reply With Quote
 Old 08-18-2019, 07:31 PM   #10
 
BR1JZL's Avatar
 
Join Date: Jan 2019
Location: Straya
Posts: 22   (View Stats)
iTrader: (0)
Rep Power: 0
BR1JZL has a spectacular aura aboutBR1JZL has a spectacular aura aboutBR1JZL has a spectacular aura about
Thanks: 7
Thanked 4 Times in 4 Posts
Groans: 0
Groaned at 0 Times in 0 Posts
(Thread Starter)
Not Ranked  0 score     
Default

Hi MSMS3,

Thanks for the input. For clarification, the circuitwerks is a racepipe by definition then, it has replaced the existing stock cats, I will correct this in my sig, thank you for the education lesson.

In regards to the PSI under driving conditions, I am actually peaking at 13PSI with mods and tune.

In regards to my previous post, I was more referring to the system holding 15PSI, like in this video: https://www.youtube.com/watch?v=bN8f4PWfvnA. I am not getting any pressure holding at all, so I am not sure if I am doing the boost leak correctly?
__________________
Mods slowly coming along!!!! Autotech HPFP, CircuitWerks Down/Testpipe, Cobb Accessport V2 and a CPE Turbo Inlet Pipe (Waiting to put it on)
BR1JZL is offline   Reply With Quote
The Following User Says Thank You to BR1JZL For This Useful Post:
MSMS3 (Yesterday)
 Old Yesterday, 07:05 AM   #11
 
MSMS3's Avatar
 
Join Date: Jun 2009
Posts: 2,586   (View Stats)
iTrader: (0)
Rep Power: 1081
MSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the world
Thanks: 1,355
Thanked 1,854 Times in 1,003 Posts
Groans: 144
Groaned at 47 Times in 31 Posts
Not Ranked  0 score     
Default

Originally Posted by BR1JZL View Post
Hi MSMS3,

Thanks for the input. For clarification, the circuitwerks is a racepipe by definition then, it has replaced the existing stock cats, I will correct this in my sig, thank you for the education lesson.

In regards to the PSI under driving conditions, I am actually peaking at 13PSI with mods and tune.

In regards to my previous post, I was more referring to the system holding 15PSI, like in this video: https://www.youtube.com/watch?v=bN8f4PWfvnA. I am not getting any pressure holding at all, so I am not sure if I am doing the boost leak correctly?
Are you sure about that Circuitwerks product? Do you have a photo? Our upper pre-CBE exhaust is two separate pieces with two separate cats. Most aftermarket downpipes only replace the downpipe and not the midpipe. The catted midpipe gets replaced by a separate straight open pipe (racepipe). Some companies sell matching dp/rp sets, but I’ve never seen a combined one piece dp/rp. I’m not familiar with Circuitwerkes. It must be a new product for our platform. Certainly not something commonly encountered here. A photo would answer the question.
__________________
2017 Audi Q5 3.0 T (supercharged) Stage 2+ EPL tune, JHM overdrive crank pulley, EPL supercharger pulley, ZF8 TCU tune, aFe/034 intake, modified air box. 480 hp.

Sunlight Silver '08 MS3 GT Mods: (Sold 1/25/2019 after 10 years of ownership)
BNR Stage 1 (to fix smoking K04 turbo), TurboXS 3" Catless DP/RP "Stealthback" into stock CBE, Vibrant 3 inch Ultra Quiet Resonator in RP section, Magnaflow 3 1/2" exhaust tip, Mazdaspeed CAI w/air straightener and K&N conical filter, NGK 6510 Iridium IX one step colder plugs, Hypertech tune, Autotech HPFP internals, Stock BPV (works perfectly), Yokohama Advan Neova AD08R's (stock size on stock rims); Hawk HPS pads; SURE RMM; Grimmspeed EBCS (2 port mode), Bilstein B6's, SPC rear camber arms.
MSMS3 is offline   Reply With Quote
 Old Yesterday, 02:28 PM   #12
 
BR1JZL's Avatar
 
Join Date: Jan 2019
Location: Straya
Posts: 22   (View Stats)
iTrader: (0)
Rep Power: 0
BR1JZL has a spectacular aura aboutBR1JZL has a spectacular aura aboutBR1JZL has a spectacular aura about
Thanks: 7
Thanked 4 Times in 4 Posts
Groans: 0
Groaned at 0 Times in 0 Posts
(Thread Starter)
Not Ranked  0 score     
Default

Originally Posted by MSMS3 View Post
Are you sure about that Circuitwerks product? Do you have a photo? Our upper pre-CBE exhaust is two separate pieces with two separate cats. Most aftermarket downpipes only replace the downpipe and not the midpipe. The catted midpipe gets replaced by a separate straight open pipe (racepipe). Some companies sell matching dp/rp sets, but Iíve never seen a combined one piece dp/rp. Iím not familiar with Circuitwerkes. It must be a new product for our platform. Certainly not something commonly encountered here. A photo would answer the question.
I have attached a picture of the Circuitwerks dp/racepipe for reference, which is in place of the stock 2 cats. I have also tested it for leaks (smoke test and soapy water test) and the welds and flex are all good.


In regards to the boost test, are we meant to block off anywhere, other than the hose going from the inlet pipe to the VC?
Attached Images
File Type: jpg Circuitwerks.jpg (5.4 KB, 12 views)
__________________
Mods slowly coming along!!!! Autotech HPFP, CircuitWerks Down/Testpipe, Cobb Accessport V2 and a CPE Turbo Inlet Pipe (Waiting to put it on)
BR1JZL is offline   Reply With Quote
The Following User Says Thank You to BR1JZL For This Useful Post:
MSMS3 (Yesterday)
 Old Yesterday, 04:32 PM   #13
 
MSMS3's Avatar
 
Join Date: Jun 2009
Posts: 2,586   (View Stats)
iTrader: (0)
Rep Power: 1081
MSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the world
Thanks: 1,355
Thanked 1,854 Times in 1,003 Posts
Groans: 144
Groaned at 47 Times in 31 Posts
Not Ranked  0 score     
Default

Originally Posted by BR1JZL View Post
I have attached a picture of the Circuitwerks dp/racepipe for reference, which is in place of the stock 2 cats. I have also tested it for leaks (smoke test and soapy water test) and the welds and flex are all good.


In regards to the boost test, are we meant to block off anywhere, other than the hose going from the inlet pipe to the VC?
I see that it is one piece. Thanks. Haven't seen one like that before. Where are the bungs for the primary and secondary O2 sensors? Looks like there might be one right on top of the downpipe arch, but I can't tell for sure. And the one for the secondary sensor downstream?

It's been a while since I've done a boost test and I sold my car and the tester with it back in January. But, I don't recall blocking off anything because my tester was usually connected directly to the compressor side of the turbo, bypassing the TIP for the test. My tester was made to fit to the turbo.
__________________
2017 Audi Q5 3.0 T (supercharged) Stage 2+ EPL tune, JHM overdrive crank pulley, EPL supercharger pulley, ZF8 TCU tune, aFe/034 intake, modified air box. 480 hp.

Sunlight Silver '08 MS3 GT Mods: (Sold 1/25/2019 after 10 years of ownership)
BNR Stage 1 (to fix smoking K04 turbo), TurboXS 3" Catless DP/RP "Stealthback" into stock CBE, Vibrant 3 inch Ultra Quiet Resonator in RP section, Magnaflow 3 1/2" exhaust tip, Mazdaspeed CAI w/air straightener and K&N conical filter, NGK 6510 Iridium IX one step colder plugs, Hypertech tune, Autotech HPFP internals, Stock BPV (works perfectly), Yokohama Advan Neova AD08R's (stock size on stock rims); Hawk HPS pads; SURE RMM; Grimmspeed EBCS (2 port mode), Bilstein B6's, SPC rear camber arms.
MSMS3 is offline   Reply With Quote
 Old Yesterday, 04:37 PM   #14
 
BR1JZL's Avatar
 
Join Date: Jan 2019
Location: Straya
Posts: 22   (View Stats)
iTrader: (0)
Rep Power: 0
BR1JZL has a spectacular aura aboutBR1JZL has a spectacular aura aboutBR1JZL has a spectacular aura about
Thanks: 7
Thanked 4 Times in 4 Posts
Groans: 0
Groaned at 0 Times in 0 Posts
(Thread Starter)
Not Ranked  0 score     
Default

There is a bung before the flex and one after, I've actually attached another picture for clarification.

Ok cool, I have tried both methods for the boost leak test and I am getting the same result.

Do you remember if you regulated the amount of air via the air compressor (eg set it to 30psi)?
Attached Images
File Type: jpg Circuitwerks.jpg (9.3 KB, 9 views)
__________________
Mods slowly coming along!!!! Autotech HPFP, CircuitWerks Down/Testpipe, Cobb Accessport V2 and a CPE Turbo Inlet Pipe (Waiting to put it on)
BR1JZL is offline   Reply With Quote
The Following User Says Thank You to BR1JZL For This Useful Post:
MSMS3 (Yesterday)
 Old Yesterday, 04:54 PM   #15
 
MSMS3's Avatar
 
Join Date: Jun 2009
Posts: 2,586   (View Stats)
iTrader: (0)
Rep Power: 1081
MSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the world
Thanks: 1,355
Thanked 1,854 Times in 1,003 Posts
Groans: 144
Groaned at 47 Times in 31 Posts
Neutral  +1 score     
Default

Originally Posted by BR1JZL View Post
There is a bung before the flex and one after, I've actually attached another picture for clarification.

Ok cool, I have tried both methods for the boost leak test and I am getting the same result.

Do you remember if you regulated the amount of air via the air compressor (eg set it to 30psi)?
I do remember this much:

1. Yes, I used a regulated air supply from my air compressor, setting it at no more than 25 psi. My tester connected by silicone hose directly to the compressor side of the turbo. It also had its own gauge. I used both my air compressor gauge to make sure my incoming air was not too high to damage anything. 25 psi is fine. My tester had an NP 1/4 inch male air hose fitting so I could connect directly to it with the hose from my air compressor.

2. I then would pressurize the system with air I knew to be at 25 psi and watch the gauge on top of the tester to see if it was building and holding pressure. If there was a leak, I would usually hear it and the gauge on top would have trouble getting to 25 psi if at all. A bad leak will usually show up by the time you get to 10-12 psi. I could then must squirt water on the area where the air sound was coming from, see the bubbles and fix the problem. Always was a clamp. I never blew a boost tube the entire almost 11 years I owned the car, although others here have.
BR1JZL likes this.
__________________
2017 Audi Q5 3.0 T (supercharged) Stage 2+ EPL tune, JHM overdrive crank pulley, EPL supercharger pulley, ZF8 TCU tune, aFe/034 intake, modified air box. 480 hp.

Sunlight Silver '08 MS3 GT Mods: (Sold 1/25/2019 after 10 years of ownership)
BNR Stage 1 (to fix smoking K04 turbo), TurboXS 3" Catless DP/RP "Stealthback" into stock CBE, Vibrant 3 inch Ultra Quiet Resonator in RP section, Magnaflow 3 1/2" exhaust tip, Mazdaspeed CAI w/air straightener and K&N conical filter, NGK 6510 Iridium IX one step colder plugs, Hypertech tune, Autotech HPFP internals, Stock BPV (works perfectly), Yokohama Advan Neova AD08R's (stock size on stock rims); Hawk HPS pads; SURE RMM; Grimmspeed EBCS (2 port mode), Bilstein B6's, SPC rear camber arms.
MSMS3 is offline   Reply With Quote
 Old Today, 02:48 AM   #16
 
BR1JZL's Avatar
 
Join Date: Jan 2019
Location: Straya
Posts: 22   (View Stats)
iTrader: (0)
Rep Power: 0
BR1JZL has a spectacular aura aboutBR1JZL has a spectacular aura aboutBR1JZL has a spectacular aura about
Thanks: 7
Thanked 4 Times in 4 Posts
Groans: 0
Groaned at 0 Times in 0 Posts
(Thread Starter)
Not Ranked  0 score     
Default

Originally Posted by Vansquish View Post
OK. I've taken a look at your logs, but before I get to them, here are a few comments based on your post only.

1. AFRs of 29.3 should only be occurring when you're off the throttle. That is, they should spike to 29.3 during shifts, but under acceleration your AFRs should be between about 10:1 and 14.7:1 depending on the conditions.

2. Accelerator pedal position (APP) and Throttle position (TP) are not the same thing. It sounds like you are describing APP which can go as high as 99% at WOT, but WOT is only 70%-ish for throttle position.

3. If you're doing a MAF calibration run properly, then you probably won't get to 100g/s until quite close to redline. It's easier to do a MAF calibration log in a higher gear, as loads increase substantially with gear ratios.

4. The OTS maps are almost universally awful. After COBBS V100-series OTS maps, the tunes have all been neutered and weak. I'm not surprised that you're only hitting 13psi.

Now to the datalogs themselves:

1. You are risking serious engine damage the way that you are doing your WOT runs. It is well known that going WOT at very low revs on an undersquare engine is a recipe for bent connecting rods and blown motors. On our platform specifically, there is almost universal agreement that you should NOT go WOT below 3000rpm. Period.

2. At WOT, your car is adding fuel at a substantial rate to try and make AFR targets. That is, you appear to have a pre-turbo, post MAF sensor leak. However, you are hitting your AFR targets at WOT.

Additionally, your extremely short idle log (I mean, really? You expect us to diagnose something in a 3 second-long log?) suggests that your car is running rich at idle the entire time, as the ECU is pulling fuel for the whole log. This suggests that your engine is receiving less air than expected for the amount of fuel being injected.

Since the WOT, MAF Cal and Idle logs all say slightly different things, I would guess that you may just not be using a map that is appropriate for your modifications.

3. Your MAF calibration log seems to support this, as a significant amount of the log, up to around 4200rpm, shows that your ECU is trying to pull fuel to meet AFR targets. That is, you are running rich to that point. Above about 4200 RPM, your car suddenly starts adding fuel to meet AFR targets. You're in vacuum, rather than boost for pretty much the entire time.

If you had a vacuum leak, your car's behavior would likely be a bit different. With a pre-turbo vacuum leak, when your car was in vacuum and under boost, you would be running lean, and the ECU would be adding a bunch of fuel to the mixture. With a post-turbo vacuum leak, when your car was in vacuum you would be running lean, but when your car was in boost, you would be running rich (air would be escaping the system).

Your car has the opposite symptoms. You are running rich in vacuum and lean at WOT. Therefore, it is not a typical pre or post-turbo leak. Accordingly, you probably are running an inappropriate tune.
I forgot to ask @Vanquish, how do I know what is an appropriate tune then? I am trying the tunes that match the mods (even given the Cobb OTS maps are universally horrible), but the LTFT seems to be getting worse? I have attached the latest logs
Attached Files
File Type: csv 3rd WOT 20th Aug.csv (29.8 KB, 0 views)
File Type: csv IDLE FT 20th Aug.csv (21.8 KB, 0 views)
File Type: csv MAF CAL 20th Aug.csv (37.1 KB, 0 views)
__________________
Mods slowly coming along!!!! Autotech HPFP, CircuitWerks Down/Testpipe, Cobb Accessport V2 and a CPE Turbo Inlet Pipe (Waiting to put it on)
BR1JZL is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Boost leak test caused an oil to leak from dipstick shazy MazdaSpeed 3/6 - Turbo Induction 13 08-06-2019 05:27 AM
Boost leak test Brendanb Gen2 MS3 General Discussion 6 01-04-2014 11:49 PM
Trying to test for boost leak, could use some help ChavesB1 Mazdaspeed3/6 General Discussion 6 03-31-2013 07:11 AM


All times are GMT -7. The time now is 03:20 AM.
Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
SEO by vBSEO ©2011, Crawlability, Inc.
vB.Sponsors
Template-Modifications by TMS
©Copyright 2008 ; 2019 Cymru Internet Services LLC | FYHNô Autosports HQ
Ad Management plugin by RedTyger
Page generated in 0.35727 seconds with 24 queries