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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 > Waste gate/dv's boost leak?



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      02-15-2012, 11:27 PM   #1
Randomaccess335
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Waste gate/dv's boost leak?

I have a JB4 in map 7 using race gas fmic dp's and dc street tires ran a 12.3@114.... Thought things are great But no
Sent logs into terry of my recently installed ww meth kit and was told I'm way under boost, so than I sent in my logs from the day of and day after my night at the strip. Found I was only hitting 13 something psi in map 7, should be 16.5.
I've redid all piping fittings, clean and tight. next I'm checking vacuum lines.

Need advice on how to Test stock dv's and check if it's waste gate leaks
I'm going to do the 15 ohm mod also but to find the leak first
Thanks
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      02-16-2012, 04:02 AM   #2
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      02-16-2012, 08:21 AM   #3
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      02-16-2012, 11:38 AM   #4
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boost leak test it. you'll find every leak possible if you force 25psi of shop air into the system. check the smallest things.
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      02-16-2012, 02:26 PM   #5
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I will do that, but what about the waste gates?
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      02-16-2012, 05:20 PM   #6
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Yea your def way under boost if your only hitting around 13 on map 7. If I was you I would do a leak down test and again, it will show every possible leak. If your wastegates are having issues then you might need to get them fixed and in most cases, have your turbo's replaced Dont jump to conclusions though, first do the air test to see if you have even the slightest leak. If so, even being so small, it can cause the symptoms your having.
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      02-16-2012, 07:38 PM   #7
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K thanks I'm going to buy DIY stuff for the leak down test this weekend. Thanks for advise
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