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glyts glyts is offline
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Join Date: May 2019
Car: E92 335i xDrive DCT
Unhappy N55 JB4 & Boost inconsistency Problems - 05-10-2019, 02:01 AM

hey guys,
First time posting in a forum. Usually, the rest of the threads were enough to cover my questions.

I recently bought a 2010 335ix, 90k kilometres, N55 engine(PWG). Last week I installed a JB4, which I managed to get to work last night. Never underestimate software updates people.

Now lets jump straight to the issue. I have attached a video showing the strange behaviour of my engine after running on Map 1.

Boost Bouncing Around.mov - Google Drive

Boost is inconsistent, making me believe that there is a boost leak somewhere. However, when JB4 is disabled, the car runs butter smooth again. Could it be that my pneumatic wastegate is faulty? any input, advice appreciated.

Last edited by glyts; 05-10-2019 at 07:24 AM..
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