RPM's fly to Redline when WOT???

robsta813 · 06-27-2016, 08:24 AM

This has been happening for the past 2 weeks. I have an 09 E92 335i FBO with inlets/outlets running MHD E40 Map V6. It was running fine and then one day I went WOT and it screamed to redline in a split second (almost as if the clutch was slipping). I have an upgraded ACT HD clutch and flywheel so I know that's not it, however it does not seem to want to hold boost under WOT. Just replaced 3.5 bar T-map sensor and adapter.

If I give it three quarters throttle, I see 17+ psi just fine.

Anyone have any idea what this could be?

Thanks in advance!

TGNY 335 · 06-27-2016, 08:29 AM

Quote:

Originally Posted by robsta813

This has been happening for the past 2 weeks. I have an 09 E92 335i FBO with inlets/outlets running MHD E40 Map V6. It was running fine and then one day I went WOT and it screamed to redline in a split second (almost as if the clutch was slipping). I have an upgraded ACT HD clutch and flywheel so I know that's not it, however it does not seem to want to hold boost under WOT. Just replaced 3.5 bar T-map sensor and adapter.

If I give it three quarters throttle, I see 17+ psi just fine.

Anyone have any idea what this could be?

Thanks in advance!

if you are 6MT and you are in gear. and go full throttle and the RPM's shoot up but the car doesn't accelerate in correlation to the speed the RPM's rise. your clutch is slipping, or your tires are spinning.

RJ_ · 06-27-2016, 10:18 AM

Quote:

Originally Posted by TGNY 335

if you are 6MT and you are in gear. and go full throttle and the RPM's shoot up but the car doesn't accelerate in correlation to the speed the RPM's rise. your clutch is slipping, or your tires are spinning.

+1

patents · 06-28-2016, 09:44 PM

RPMs going to redline is pretty much what's supposed to happen at WOT.

TGNY 335 · 06-28-2016, 09:58 PM

Quote:

Originally Posted by patents

RPMs going to redline is pretty much what's supposed to happen at WOT.

Not without the car accelerating with it

patents · 06-29-2016, 03:50 PM

Quote:

Originally Posted by TGNY 335

Not without the car accelerating with it

Did OP's car accelerate?

robsta813 · 06-30-2016, 07:36 AM

Car engages and accelerates fine until gauge flies to redline in which I'm then coasting. Car does not continue accelerating when this happens. Again, this only happens at WOT. 3/4 throttle seems to be holding fine. :/

ferocity02 · 06-30-2016, 03:26 PM

As mentioned, something is slipping. The only two things that can slip in your MT are the clutch and the tires.

MightyMouseTech · 06-30-2016, 03:35 PM

Quote:

Originally Posted by ferocity02

As mentioned, something is slipping. The only two things that can slip in your MT are the clutch and the tires.

This. Clutch or tires. If you are driving with the traction control on, then it is your clutch.

TGNY 335 · 07-01-2016, 09:26 AM

its your clutch. it can no longer hold the power level youre at. Hence why its fine when you arent giving it full throttle.

robsta813 · 03-15-2017, 03:27 PM

Sorry for super late update, but felt I should have addressed this after fixing the simple problem causing my RPM's to fly to redline. The culprit turned out to be a boost leak.

The clutch was perfectly fine. My lower charge pipe popped off the intercooler and was no longer connected. Once this was addressed, the car has run perfectly since.

06-27-2016, 08:24 AM	#1
robsta813 Enlisted Member 8 Rep 35 Posts Drives: 2009 E92 335i 6MT Join Date: Feb 2016 Location: Tampa, Florida iTrader: (0)	RPM's fly to Redline when WOT??? This has been happening for the past 2 weeks. I have an 09 E92 335i FBO with inlets/outlets running MHD E40 Map V6. It was running fine and then one day I went WOT and it screamed to redline in a split second (almost as if the clutch was slipping). I have an upgraded ACT HD clutch and flywheel so I know that's not it, however it does not seem to want to hold boost under WOT. Just replaced 3.5 bar T-map sensor and adapter. If I give it three quarters throttle, I see 17+ psi just fine. Anyone have any idea what this could be? Thanks in advance!
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06-28-2016, 09:44 PM	#4
patents Lieutenant 164 Rep 598 Posts Drives: 2008 328i Join Date: Aug 2014 Location: Memphis, TN iTrader: (0)	RPMs going to redline is pretty much what's supposed to happen at WOT.
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06-30-2016, 07:36 AM	#7
robsta813 Enlisted Member 8 Rep 35 Posts Drives: 2009 E92 335i 6MT Join Date: Feb 2016 Location: Tampa, Florida iTrader: (0)	Car engages and accelerates fine until gauge flies to redline in which I'm then coasting. Car does not continue accelerating when this happens. Again, this only happens at WOT. 3/4 throttle seems to be holding fine. :/
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06-30-2016, 03:26 PM	#8
ferocity02 Colonel 530 Rep 2,083 Posts Drives: 2013 135is Join Date: May 2014 Location: USA iTrader: (8)	As mentioned, something is slipping. The only two things that can slip in your MT are the clutch and the tires. __________________ 2013 135is DCT Carbon Black Metallic
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07-01-2016, 09:26 AM	#10
TGNY 335 Banned 195 Rep 212 Posts Drives: 2007 335xi 6MT Join Date: Nov 2015 Location: US iTrader: (0)	its your clutch. it can no longer hold the power level youre at. Hence why its fine when you arent giving it full throttle.
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03-15-2017, 03:27 PM	#11
robsta813 Enlisted Member 8 Rep 35 Posts Drives: 2009 E92 335i 6MT Join Date: Feb 2016 Location: Tampa, Florida iTrader: (0)	Sorry for super late update, but felt I should have addressed this after fixing the simple problem causing my RPM's to fly to redline. The culprit turned out to be a boost leak. The clutch was perfectly fine. My lower charge pipe popped off the intercooler and was no longer connected. Once this was addressed, the car has run perfectly since.
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