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 Old 10-30-2011, 08:13 PM   #1
 
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Default Big Turbo boost by gear?

Just like the title asks. Anyone try running boost by gear on a big turbo? Spinning till 80 is a novelty that has now worn off. I am on an MBC right now but am thinking of picking up a grimspeed ebc and trying to run lower psi in gears 1 through 3 to get some driveability back. Wastegate on my 3076 is set to 10 psi and will hold it without a spike or surge so I have room to drop boost. Any tips would be appriciated. Guess it is going to be time to learn to boost tune.
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 Old 10-31-2011, 08:17 AM   #2
 
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I guess I must be asking stupid questions lately. lol. Just want to know if it feels odd driving a car that has vastly reduced boost in the lower gears and if it improves the driving dynamics to tune it this way or if it is better to just adjust with throttle modulation?
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 Old 10-31-2011, 10:56 AM   #3
 
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i say do it. what good is power if you cant use it?
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 Old 10-31-2011, 11:01 AM   #4
 
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Originally Posted by dsmluck View Post
I guess I must be asking stupid questions lately. lol. Just want to know if it feels odd driving a car that has vastly reduced boost in the lower gears and if it improves the driving dynamics to tune it this way or if it is better to just adjust with throttle modulation?
Dano and Cld12pk2go use the APP translation tables and that would save you the $ on the Grimmspeed.

I believe they cut the wot (i.e. 100% app) down to as little as 60%.

(not a stupid q. btw)
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 Old 10-31-2011, 11:06 AM   #5
 
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Originally Posted by rfinkle2 View Post
Dano and Cld12pk2go use the APP translation tables and that would save you the $ on the Grimmspeed.

I believe they cut the wot (i.e. 100% app) down to as little as 60%.

(not a stupid q. btw)
App translation tables?? Never heard of this. If it can save me the money while I can lower some power where I need it I am game. Any links to how this is done? Does it just close the throttle?
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 Old 10-31-2011, 11:10 AM   #6
 
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Originally Posted by dsmluck View Post
App translation tables?? Never heard of this. If it can save me the money while I can lower some power where I need it I am game. Any links to how this is done? Does it just close the throttle?
The APP tables = accelerator pedal position. You'll see in those tables (gen2 has 3 which are all set the same).

They tell the ecu (drive by wire) how much pedal you are requesting with pedal input.

You can effectively tell the ecu "with my foot to the floor", I only want 60% worth of what would normally be 100%.

There is no specific thread that I know of, although I remember where I saw it and will link to it here.

(I believe it may be a process of trial and error, but will get the starting values from the conversation).

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 Old 10-31-2011, 11:12 AM   #7
 
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Originally Posted by dsmluck View Post
App translation tables?? Never heard of this. If it can save me the money while I can lower some power where I need it I am game. Any links to how this is done? Does it just close the throttle?
basically your making your throttle input read less to your throttle body. you can make it so 100% throttle input is 50%, and you can change it across the whole range. so instead of tuning boost percentages with a grimmspeed you can just cut throttle down until you read desired boost/power.

Edit: finkle is fast
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 Old 10-31-2011, 11:17 AM   #8
 
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Here is the beginning of the discussion (hyperlinked)...

I bet @Dano wouldn't mind sharing his findings with you though.

http://www.mazdaspeedforums.org/foru...39/#post672053
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 Old 10-31-2011, 12:51 PM   #9
 
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Originally Posted by rfinkle2 View Post
Here is the beginning of the discussion (hyperlinked)...

I bet @Dano wouldn't mind sharing his findings with you though.

http://www.mazdaspeedforums.org/foru...39/#post672053
Thanks! The tables are by gear right? I will read that post when I get home tonight.
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 Old 10-31-2011, 03:01 PM   #10
 
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Originally Posted by dsmluck View Post
Thanks! The tables are by gear right? I will read that post when I get home tonight.
Yes sir! .

They are in the throttle table folder.
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 Old 10-31-2011, 04:04 PM   #11
 
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you can also limit load by gear or mess with the boost comp or something.


just as a note though, i have the 3076r with iwg too and you can limit boost down low, but it will creep to like 30 @ redline no matter what you do i think


edit... lol didnt mean to mention redline sorry
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 Old 10-31-2011, 04:36 PM   #12
 
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Originally Posted by TWOptSL0W View Post
you can also limit load by gear or mess with the boost comp or something.


just as a note though, i have the 3076r with iwg too and you can limit boost down low, but it will creep to like 30 @ redline no matter what you do i think


edit... lol didnt mean to mention redline sorry
I am on a MBC so load and boost adjustments wont do anything. Does your 3076 creep that bad? Maybe I wasn't understanding but do you mean that no matter how you set boost it will always hit 30 psi at redline?? I don't know I had mine set for 10 psi after the install and it held a steady 10-12 psi throughout the entire rpm band. Maybe I am crazy but I remember thinking that the turbo really held steady boost for being at such a low PSI.
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 Old 10-31-2011, 04:39 PM   #13
 
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dam i meant 20 lol sorry. i thought you were switching to an ebc. maybe its just mine, but i would go to 12 psi which i believe was spring pressure and then slowly creep to about 20 psi
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Originally Posted by dsmluck View Post
I am on a MBC so load and boost adjustments wont do anything. Does your 3076 creep that bad? Maybe I wasn't understanding but do you mean that no matter how you set boost it will always hit 30 psi at redline?? I don't know I had mine set for 10 psi after the install and it held a steady 10-12 psi throughout the entire rpm band. Maybe I am crazy but I remember thinking that the turbo really held steady boost for being at such a low PSI.
if he has an early ATP3076 IWG they are known to have creep issues. the newer ones are ported better but most people do extra porting to ensure there isn't creep
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 Old 10-31-2011, 04:54 PM   #15
 
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Originally Posted by snailD View Post
if he has an early ATP3076 IWG they are known to have creep issues. the newer ones are ported better but most people the extra porting to ensure there isn't creep
Makes sense. I picked up my 3076 a few months back from EdgeAutoSports with the anti surge porting. It doesn't creep as far as I can tell.
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 Old 10-31-2011, 09:15 PM   #16
 
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Ok just went and peaked at the tables. Seems easy enough but what are the DBW Trottle A,B,C? I know its a drive by wire throttle but those tables show a max of 80%?? Is this why my logged throttle position maxes out around 80% even while WOT? Is that normal?
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 Old 10-31-2011, 09:22 PM   #17
 
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Originally Posted by dsmluck View Post
Ok just went and peaked at the tables. Seems easy enough but what are the DBW Trottle A,B,C? I know its a drive by wire throttle but those tables show a max of 80%?? Is this why my logged throttle position maxes out around 80% even while WOT? Is that normal?
that is the number cobb implemented into their tables. i always bump mine a little just to make sure I'm hitting max throttle, but no your throttle position is always around 75-80 because thats the max of the actuator. if you log accel pedal position it will be 99.9%
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I like to use the app translation tables along with the load per gear tables to help control boost. As snaild said, the max the throttle plate will actually open is about 77%

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 Old 11-01-2011, 05:56 AM   #19
 
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My 1st and 2nd gears are controlled by app tables. I cut a 2.1 60' on all season continental's on my first pass at the track with the big turbo using app tables to control throttle in 1st and 2nd gear.

Here are the values for my first two gears.

1st
Code:
0.00	0.25	0.65	1.68	3.25	4.50	6.00	7.50	9.00	10.00	11.50	13.00	14.50	16.00	18.00	18.61	20.14	21.67	23.19	24.72	26.25	27.78	29.31	30.83	32.36	33.89	35.42	36.18	36.94	38.47	40.00
2nd
Code:
0.00	0.25	0.65	1.68	3.25	4.50	6.00	7.50	9.00	10.00	11.50	13.00	14.50	16.00	16.92	17.84	20.14	22.43	24.73	27.03	29.33	31.62	33.92	36.22	38.52	40.81	43.11	44.26	45.41	47.71	50.00
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 Old 11-01-2011, 04:00 PM   #20
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late to the party as usual...what are we trying to do...limit power per gear?

with boost targeting APP is the best way...but then again seems Gen2s Boost Comp works where gen1s doesn't

Load tuning.... TRLx gear is the ticket.
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