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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 > boost oscillating



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      09-12-2013, 01:42 PM   #1
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boost oscillating

haha its funny, typically oscillates between 80 - 100 mph, between 5 - 10 psi in increments of upto 2 psi depending on pedal... my rear turbo was leaking oil - no smoke yet, is that the cause ?

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      09-12-2013, 03:47 PM   #2
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Without knowing more details it's impossible to know.
What tune and other modifications are on the car? Mileage? Male/Female? (JK )
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      09-12-2013, 10:18 PM   #3
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Quote:
Originally Posted by Transport3r View Post
Without knowing more details it's impossible to know.
What tune and other modifications are on the car? Mileage? Male/Female? (JK )
jb4 map5 :: Afe intake :: E85 50% :: i think its a boost leak over 5psi causing oscillation, i'll be inspecting hoses this weekend
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      09-13-2013, 12:16 AM   #4
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What are you measuring the boost with? log?
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      09-13-2013, 12:24 AM   #5
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      09-13-2013, 09:12 AM   #6
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hijacked fuel guage, i'll take a video
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      09-13-2013, 09:44 AM   #7
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Quote:
Originally Posted by 007_e350 View Post
hijacked fuel guage, i'll take a video
Not very accurate. Its a close enough for government measurement. You need to read the logs & see the actual boost numbers.
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      09-13-2013, 11:29 AM   #8
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Just log it properly and send it to bms....
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      09-13-2013, 12:53 PM   #9
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what do you guys think about boost leak - I'm prob leaking > 5 psi thats when turbos work harder and it leaks again.. logging doesn't tell a whole lot, you'll see the blue line sinosiding around target boost screw that
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