Losing boost in 4/3 gear WOT

mgrych · 07-21-2014, 12:32 PM

Well, with everything that i'm running (FBO, and JB4 with E35 (map 5)) I hit what appears to be about 15 PSI at WOT in 1-3 but in 4-6 it has the tendency to drop dranstically and then spike then drop again.

I had an issue with breaking the nipple on the manifold that connects to the BOV but i feel as though i fixed it properly.. plus it would hold boost in the lower gears but not the higher ones..

Anyone have an idea of what the issue could be? Also why im not hitting 17 psi with map 5 ?

Little side note, upon changing to an aftermarket charge pipe.. there was a substantial amount of oil in the old one running down into the intercooler.. Also noticed that my car mysteriously goes through about 1 qt every 1000 miles.. but no leaks... hmmm related to the issue above?

Biggs07 · 07-21-2014, 01:30 PM

I too discovered a lot of oil in my stock pipe. I was assuming this is normal. I don't go through a lot of oil tho. Maybe 1 qt every 5-6k miles.

Zombie1 · 07-21-2014, 01:53 PM

these motors are known to blow oil into the charge pipe intercooler area. upgrade your PCV valve to a robbeck one it should help alot. also an oilcatch can is nice for peace of mind.

mgrych · 07-21-2014, 05:12 PM

Im wondering if the fuel pump has anything to do with it..

MuNkY6913 · 07-21-2014, 10:16 PM

Take some logs of it and post in the support section of N54tuning. That's going to be your best first course of action.

07-21-2014, 12:32 PM	#1
mgrych Private First Class 24 Rep 163 Posts Drives: 08 BMW 135i M-Sport Join Date: Oct 2013 Location: Green Bay iTrader: (0)	Losing boost in 4/3 gear WOT Well, with everything that i'm running (FBO, and JB4 with E35 (map 5)) I hit what appears to be about 15 PSI at WOT in 1-3 but in 4-6 it has the tendency to drop dranstically and then spike then drop again. I had an issue with breaking the nipple on the manifold that connects to the BOV but i feel as though i fixed it properly.. plus it would hold boost in the lower gears but not the higher ones.. Anyone have an idea of what the issue could be? Also why im not hitting 17 psi with map 5 ? Little side note, upon changing to an aftermarket charge pipe.. there was a substantial amount of oil in the old one running down into the intercooler.. Also noticed that my car mysteriously goes through about 1 qt every 1000 miles.. but no leaks... hmmm related to the issue above? __________________ 08 BMW 135i--JB4--DCI--CPE Downpipes--AFE Exhaust--FMIC--ER Charge Pipe W/TiAL BOV--EC-7 Wheels--Rieger Diffuser
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07-21-2014, 01:30 PM	#2
Biggs07 Second Lieutenant 10 Rep 244 Posts Drives: 08 135i..its a love hate thing Join Date: Jul 2011 Location: Hagerstown, MD iTrader: (1)	I too discovered a lot of oil in my stock pipe. I was assuming this is normal. I don't go through a lot of oil tho. Maybe 1 qt every 5-6k miles.
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07-21-2014, 01:53 PM	#3
Zombie1 Colonel 172 Rep 2,347 Posts Drives: BMW 135i 2010 Join Date: Jul 2012 Location: Island long iTrader: (6)	these motors are known to blow oil into the charge pipe intercooler area. upgrade your PCV valve to a robbeck one it should help alot. also an oilcatch can is nice for peace of mind. __________________ Mods:-Berkexhaust -alpinaB3flash -CobbAP -Cobb FMIC -ER charge pipe tialQ bov -M3 front sway bar -M3 subframe bushings -M3 front upper and lower control arms -M3 guide rods -M3 rear upper control arms -Mfactory LSD -defiv lockdown kit -TC Kline SA coilovers /camber plates- HP rear toe arms
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07-21-2014, 05:12 PM	#4
mgrych Private First Class 24 Rep 163 Posts Drives: 08 BMW 135i M-Sport Join Date: Oct 2013 Location: Green Bay iTrader: (0)	Im wondering if the fuel pump has anything to do with it.. __________________ 08 BMW 135i--JB4--DCI--CPE Downpipes--AFE Exhaust--FMIC--ER Charge Pipe W/TiAL BOV--EC-7 Wheels--Rieger Diffuser
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07-21-2014, 10:16 PM	#5
MuNkY6913 The Crowing 111 Rep 2,005 Posts Drives: BMW 135i Join Date: Feb 2010 Location: State College, PA iTrader: (4) Garage List 2009 135i [8.00]	Take some logs of it and post in the support section of N54tuning. That's going to be your best first course of action. __________________ 2009 135i : BMS JB4 G5 ISO,CXRacing FMIC Kit,Injen Cold Air Intake,Evolution Raceworks Charge Pipe,Walboro Inline Fuel Pump, E85 BMS Backend Flash w/ 60% E85,BMS Meth injection (trunkmount),BMS dual meth nozzles,Spec stage 2+ clutch w/ steel SWFW,BMS Catless Downpipes,Berk Tech Race Axleback
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