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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications Pure Stage 2 BM3 Boost drop off at 5000 RPM
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      11-16-2019, 04:15 PM   #1
PepMo
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Pure Stage 2 BM3 Boost drop off at 5000 RPM

Anyone have this problem on the F10 535? I've already had it tested for boost leaks and vacuum leaks and non was found. It will overboost at 4K RPM and under boost from 55K RPM.

http://www.bootmod3.net/log?id=5dcd08e0c090c64ba0b7e77e
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      11-16-2019, 04:28 PM   #2
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Quote:
Originally Posted by PepMo View Post
Anyone have this problem on the F10 535? I've already had it tested for boost leaks and vacuum leaks and non was found. It will overboost at 4K RPM and under boost from 55K RPM.

http://www.bootmod3.net/log?id=5dcd08e0c090c64ba0b7e77e
PWG or EWG? I got PWG and I see my car not hitting boost targets so I am going to replace boost selenoid. You might have that issue if your car is PWG.
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      11-16-2019, 07:28 PM   #3
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Have you upgraded the ridiculously restrictive factory turbo inlet pipe yet?
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      11-17-2019, 03:58 AM   #4
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Originally Posted by ziekxq View Post
PWG or EWG? I got PWG and I see my car not hitting boost targets so I am going to replace boost selenoid. You might have that issue if your car is PWG.
I have PWG. I also replaced the boost solenoid. It did not help.
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      11-17-2019, 03:59 AM   #5
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Originally Posted by Stück View Post
Have you upgraded the ridiculously restrictive factory turbo inlet pipe yet?
Yes I got the FTP turbo inlet also.
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      11-17-2019, 04:13 AM   #6
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By the way Stück I've been following your build threads for awhile to help me in my build. Thank you for your posts.

This under boosting problem is getting very frustrating. I think I've spent $1000 just for diagnose and changing out parts that did nothing to solve the problem.

I have stock intake with just a drop in filter , an AR catted DP, and stock exhaust pipes from cat back. Are these too restrictive for the boost I'm trying to make up top? The turbo overboost like crazy at 3-4K RPM, but after that it will just drop off a cliff.
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