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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Slight Overboost - help?



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      03-22-2015, 08:10 PM   #23
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Originally Posted by jwebb335xi View Post
Thanks for the comments guys.

So, just to be clear, are you saying I should (1) ignore/trash the updated map i created that didn't do the trick, (2) start back at Cobb Stage 1 +, (3) lower the D multiplier on the Cobb Stage 1+ and then (4) increase load request 3% across the board in both load target and load target AT tables?

As to temps, it was about 60 when I did these logs and the car was showing intake temps in the upper 70s, low 80s even when pressed pretty hard. It seems this FMIC is keeping temps close to ambient than the stock FMIC by a pretty wide margin.
I would go back to base Map, increase request load to 185 is a good thought. Then start with the pid adjustments. Let's see what that gets u, keep the other map but I'm thinking PID can address this.
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      03-22-2015, 08:27 PM   #24
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Originally Posted by JNAT* View Post
Cobb cut this table in half for all their maps.
I thought the same thing, but for whatever reason, Cobb only cut the D-factor table in half on the 402 (+FMIC) and 403 (race) maps. v401 OTS maps still have the full value.

Not really an issue since OP is starting with Stage 1+ as a base, just wanted to point it out
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      03-22-2015, 08:54 PM   #25
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Originally Posted by RSL View Post
I thought the same thing, but for whatever reason, Cobb only cut the D-factor table in half on the 402 (+FMIC) and 403 (race) maps. v401 OTS maps still have the full value.

Not really an issue since OP is starting with Stage 1+ as a base, just wanted to point it out
Noted.
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      03-22-2015, 09:37 PM   #26
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Quote:
Originally Posted by jwebb335xi View Post
Thanks for the comments guys.

So, just to be clear, are you saying I should (1) ignore/trash the updated map i created that didn't do the trick, (2) start back at Cobb Stage 1 +, (3) lower the D multiplier on the Cobb Stage 1+ and then (4) increase load request 3% across the board in both load target and load target AT tables?

As to temps, it was about 60 when I did these logs and the car was showing intake temps in the upper 70s, low 80s even when pressed pretty hard. It seems this FMIC is keeping temps close to ambient than the stock FMIC by a pretty wide margin.
1) Technically I dont know how much wgdc base you chopped away to determine to throw it away or not. So just start over with the OTS map. My method is the wgdc base should be the last thing to touch, not the first thing.

2) Yes

3) Yes

4) Yes
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      03-22-2015, 10:00 PM   #27
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Originally Posted by BuraQ View Post
1) Technically I dont know how much wgdc base you chopped away to determine to throw it away or not. So just start over with the OTS map. My method is the wgdc base should be the last thing to touch, not the first thing.

2) Yes

3) Yes

4) Yes
Thanks for all the help guys. I'll toss out the last attempt, start with the OTS Stage 1+, add load and trim the multiplier table as noted above. I hope to do this all and run some logs on Wednesday if the weather holds. I'll post up the results and let you know how the butt dyno reacts to the changes as well.

On a side note, my wife commented that the car seems really fast now!
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      03-25-2015, 08:04 PM   #28
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Quote:
Originally Posted by BuraQ View Post
1) Technically I dont know how much wgdc base you chopped away to determine to throw it away or not. So just start over with the OTS map. My method is the wgdc base should be the last thing to touch, not the first thing.

2) Yes

3) Yes

4) Yes
Thanks again. I just programmed a new MAP. D-factor multiplier is decreased to 95% of Cobb Stage 1+ LT Sport begging with 4,000-RPMs. I've also upped the Cobb Stage 1+ LT Sport "load target" and "load target AT" tables by multiplying by 103% across the board. My load at mid range looks really close to Cobb Stage 1+ LT Aggressive.

I'll log tomorrow if it's dry. That said, if I see over-boost or throttle closure, I'll go back and reduce the D-factor multiplier by another 5%. If that fails, i may go into the base table, which addressed throttle closure last time, but didn't eliminate over-boost. Hence, I started over as suggested above.

Thanks again guys!
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