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 Old 07-12-2018, 03:34 PM   #1
 
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Default Can't hit more than 10psi

I can't get more than 10psi peak boost. It doesn't sound like I have an air leak but I am thinking that might be the problem. What do you guys think? I attached some logs from a couple short pulls. I went around and tightened up everything I could find but still can't get much boost.

2007 MS6
SRI - CorkSport with K&N filter
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Power Steering Cooler Upgrade - DamondMotorsport
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 Old 07-12-2018, 07:35 PM   #2
 
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Since you registered 5.66 g/s air flow at 5466 RPM, I'm gonna go out on a limb and say it's your MAF sensor lol
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 Old 07-13-2018, 12:34 AM   #3
 
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Well, your primary O2 sensor is shot. 14.85AFR across the board. Change it and try again. I recommend either OEM or NGK.

Originally Posted by Solarsurge View Post
Since you registered 5.66 g/s air flow at 5466 RPM, I'm gonna go out on a limb and say it's your MAF sensor lol
Well, he shifter to next gear at that point.
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Last edited by mituc; 07-13-2018 at 12:34 AM. Reason: MSF Database - Automerged Doublepost
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 Old 07-13-2018, 12:43 AM   #4
 
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Originally Posted by mituc View Post
Well, he shifter to next gear at that point.
Good catch. I'm so used to seeing single gear pulls I didn't even see that lol. Those air flows are really low for WOT at 5500 RPM though, so I wasn't even looking at the shifts. I was just seeing really low flow rates dropping to even lower flow rates. I wouldn't be surprised if he has a dirty MAF too. But yea, now that I see the shift...O2 sensor.
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 Old 07-13-2018, 06:02 AM   #5
 
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Just had to replace primary O2 sensor for same reason months ago - constant 14.85 AFR. That sensor is definitely dead. For my '08 MS3 I replaced it with the NGK NTK 24357 Oxygen Sensor ($120 on Amazon/$115 on Rockauto). It has been working great.
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 Old 07-13-2018, 05:01 PM   #6
 
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Strange that it doesn't show an engine code. I'm afraid to order the wrong one. Are you sure that one will work for me?

This is what I found as same part number but I don't want to pay 300...

http://www.sparespro.com.au/ngk-oxygen-sensor-lza07-md1
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 Old 07-13-2018, 05:07 PM   #7
 
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They sell a NGK O2 sensor on Edge Autosport for about the same price, maybe a little more. I would trust NGK before NTK any day the week If you don’t want to go with OEM


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 Old 07-13-2018, 05:25 PM   #8
 
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Is Denso oem? Because this is what I ordered:

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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 Old 07-13-2018, 05:33 PM   #9
 
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Isn't NTK an NGK brand? The part always comes up as NGK NTK 24357. Interesting though that Edge sells it as NGK 24357 for $40-45 more and show retail price as like $330... seems like the same part to me despite the disparities. Am I wrong?
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 Old 07-13-2018, 06:15 PM   #10
 
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Default Can't hit more than 10psi

I’ll be damned. Learn something new every day. I had no idea they were the same company. Carry on. Nothing to see here lol

Edit: For the record, I ONLY buy OEM sensors, so I’ve never actually bought anything from NGK/NTK other than spark plugs.

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 Old 07-14-2018, 04:56 AM   #11
 
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Originally Posted by njdurkin View Post
Is Denso oem? Because this is what I ordered:

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
See above post.
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 Old 07-14-2018, 06:25 AM   #12
 
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I see no mention of that Denso part anywhere for an MS6 - definitely not the part I would try. Looks like the NGK part number for 2006/2007 MS6 primary O2 sensor is ngk 24354. Looks like it's about $140 on Amazon.
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 Old 07-14-2018, 07:04 AM   #13
 
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What is OEM then?
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 Old 07-14-2018, 10:26 AM   #14
 
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Edge lists L3M6188G1F as OEM parts for your MS6, Rock Auto does show that Denso as a part for your MS6. Hopefully an MS6 owner can weigh in and confirm...
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 Old 07-15-2018, 01:22 AM   #15
 
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Originally Posted by njdurkin View Post
What is OEM then?
The OEM is like $30 more than an aftermarket, why do you like complicating your life for 30 bucks?! This is the price of an average meal or 3 fancy ice creams... while that O2 sensor will stay in the car for a lot longer than you'd enjoy that meal or icecreams...
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 Old 07-15-2018, 12:55 PM   #16
 
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Well I was trying to get OEM but I couldn't find what OEM was. I ordered the denso one but the part actually says NTK on it with the same maching number as the one I pulled off.

UPDATE:
New o2 sensor installed. Thank you for helping me identify my false AFRs. Now, I noticed a difference. The numbers obviously change now, but I did experience a tiny bit more power and I even hit over 11 psi on one of the 2 3rd gear pulls I have attached. I still think I have a boost leak or something. I should be hitting 15psi peak with the tune I am running. I'm on the 91 tune right now but I still think it peaks at 15psi. Can you see anything in my data logs?

Thanks!
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 Old 07-16-2018, 08:28 AM   #17
 
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Sounds like a leak to me although I'd probably start with reflashing your map now that you have that O2 sensor replaced. If you don't have a boost leak tester I'd physically tighten/check all connections on air intake and turbo inlet pipe. Those connections might look OK when you're just looking at them but allowing air to leak once the systems are pressurized to 10 PSI, a boost leak tester would help isolate this since you would see pressure drop once pressurizing to 10 PSI. I'd also check the CS BPV, I've never used that one personally but I believe you're supposed to be disassembling and lubricating/servicing 1-2 times a year.

Sorry not the most helpful post but hopefully the post bump will get someone to look at this thread with better advice.
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 Old 07-16-2018, 08:50 AM   #18
 
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Originally Posted by njdurkin View Post
Can you see anything in my data logs?
Reflash and see where that gets you. As far as I can tell there is no boost leak judging by the actual AFRs and the BPV is not leaking either. The WGDCs tell that your ECU simply doesn't want to get more air that it pulls in now, so this may be a result of some kind of semi-limp mode.
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 Old 07-16-2018, 02:58 PM   #19
 
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I reflashed, tightened everything up AGAIN it is super tight and still same exact problem. I uploaded the stage1+IC with 93 and also took apart the bpv and it looks very good. Like brand new. I cleaned it and put the grease they recommended in it. Test drove it again, still cannot get over 11.25lbs. I don't know, maybe 11.25 is normal for boos pressure starting out at 3k rpms. Maybe the 15, 16 lbs they are talking about are when building from 2k rpms? Anybody have any experience with a stage 1 or 2 cobb setup? The only 2 things I know to do right now is find someone with a boost leak tester and contact cobb and hope they can shed some light on the situation.

Things to note: I do have a slight exhaust leak somewhere (not sure where) and I also think it needs a valve cover gasket because I have oil all round the valve cover. Could these two items affect my boost pressure?
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 Old 07-19-2018, 12:00 PM   #20
 
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Borrow an EBCS from someone else and see how things will look like.
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Installed CAI and now only have 10psi of boost dbrier MazdaSpeed 3/6 - Turbo Induction 2 06-08-2009 12:57 PM
Only boosting 10PSI ?? glocK23 MazdaSpeed 3/6 - Troubleshoot/Diagnostics 6 05-18-2009 01:35 PM
took off mbc and only seeing 10psi b-ron MazdaSpeed 3/6 - Turbo Induction 2 07-29-2008 10:01 PM


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