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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 > High boost Cobb Stage 1 accesport 91 spot



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      08-28-2013, 07:17 AM   #1
Xdrive335
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High boost Cobb Stage 1 accesport 91 spot

I just installed my accessport on my 2009 335xi and took it for a spin. I had the accesport set to show boost gauge while driving. My first drive it showed my max boost was 16psi which is 5psi more than it should be. My second time out I did a third gear pull and it said max boost was 21.6 psi.

I read that you can't trust the max boost because pressure can momentarily buil up behind throttle plate but 21.6 seems way to high.

Should I just do a log run and see what the boost actually is through the rpm range? Or is it to risky with boost getting that high?
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      08-28-2013, 07:26 AM   #2
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Quote:
Originally Posted by Xdrive335 View Post
I just installed my accessport on my 2009 335xi and took it for a spin. I had the accesport set to show boost gauge while driving. My first drive it showed my max boost was 16psi which is 5psi more than it should be. My second time out I did a third gear pull and it said max boost was 21.6 psi.

I read that you can't trust the max boost because pressure can momentarily buil up behind throttle plate but 21.6 seems way to high.

Should I just do a log run and see what the boost actually is through the rpm range? Or is it to risky with boost getting that high?
Always log but 21.6 is from the throttle plate closing when you let off the gas. It's not actually your boost.

Max boost of 16psi is fine because it is in the lower rpm where that is within the efficiency of the turbos.

Feel free to post logs. If you want something custom tuned let us know.
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      08-28-2013, 12:21 PM   #3
Xdrive335
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datalogs

2 datalogs if anyone wants to look at them for me

Thanks

Opened on a PC they are readable but on a IPad it is gibberish
Attached Files
File Type: txt datlog e90post.txt (22.2 KB, 31 views)
File Type: txt datalog e90post 2.txt (27.1 KB, 26 views)

Last edited by Xdrive335; 08-28-2013 at 02:42 PM.
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      08-28-2013, 10:00 PM   #4
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Bump?
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      08-29-2013, 01:04 AM   #5
blacknbean
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you would get a lot better response if you graphed the logs instead of making people download and look into. here is the first log. everything looks ok to me.
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      08-29-2013, 06:34 AM   #6
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Originally Posted by blacknbean View Post
you would get a lot better response if you graphed the logs instead of making people download and look into. here is the first log. everything looks ok to me.
Thanks MUCH appreciated I have no idea how to do that any tips you could give me?
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      08-29-2013, 06:51 AM   #7
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Should my tps actual not be more or less the same as my accelerator pedal position?
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      08-29-2013, 11:08 AM   #8
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Originally Posted by Xdrive335 View Post
Should my tps actual not be more or less the same as my accelerator pedal position?
It's normal the way it is.
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      08-29-2013, 11:25 AM   #9
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Originally Posted by Xdrive335 View Post
Thanks MUCH appreciated I have no idea how to do that any tips you could give me?
Search for "Zasquatch's COBB grapher."
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