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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 05-14-2016, 11:51 AM
NickyBMW NickyBMW is offline
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Location: New York City
 
Join Date: May 2016
Posts: 6
Mein Auto: 11' E92 N55
Possible Boost Leak N55 e92

So i get my car, i add the intake and then the jb4. A few months later i get a blow off valve check engine and the boost stops being consistantly 12 lbs. i bring to the shop[ and add a new charge pipe without the 90 degree angle hoping it will fix the issue. i also add a megan racing downpipe. i have not seen double digit boost since. Now i know that boost varies but the car feels slower. Any thoughts? i think i have a boost leak somehwere as it only reads about 9 pounds now and it seems the downpipe and charge pipe just negated the boost leak and its just as fast as stock with intake and jb4.
Should i upgrade diver tor valve? will the FMIC fix a possible leak? i read there are other valves that sometimes leak? Will the charge of charge pipe and downpipes effect my boost so much that i go from 12 -14 p[ounds depending on map consistantly to 8-9 pounds and a power loss?
anybody experience this before?
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Old 05-17-2016, 09:50 PM
NickyBMW NickyBMW is offline
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Mein Auto: 11' E92 N55
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  #3  
Old 05-18-2016, 06:17 PM
08 335Ci's Avatar
08 335Ci 08 335Ci is offline
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Location: Pocono Mts. Pa USA
 
Join Date: Nov 2011
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Mein Auto: 2008 335Ci
Things that affect Boost:

Clogged or collapsed air filter, intake charge pipes
Waste gates, were they buggered during the DP install?
Restriction in intercooler (oil from a bad PCV system)
Clogged exhaust

Is the JB4 map 0-6 limiting your boost?
Are you in 'valet mode'?
Are you due for a valve cleaning?

You may also want to look at this thread
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Last edited by 08 335Ci; 05-21-2016 at 04:18 AM. Reason: Added link.
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