Revs suddenly climb then drop during WOT

dbworld4k · 07-21-2014, 10:13 AM

Installed my FMIC and upped my Cobb to Stage 1 + FMIC Aggressive.
Noticed that during heavy throttle (ie. more than 50%) in 4th/5th/6th, the revs will shoot up almost like the clutch is slipping and then stabilize and the car continues to pull hard again. This doesn't happen if I take the tune off, which makes sense if the clutch is indeed on it's way out then stock power levels are less demanding of it.

Anyone else experience this? Could this be boost related if there's a leak, or is it just the clutch?

Miller335 · 07-21-2014, 10:25 AM

Sounds exactly like a slipping clutch.

If you log you will see a plateau in your rpm during the event.

rholden614 · 09-12-2015, 06:23 PM

I have the same problem with my 08' 335i 6mt. did you ever figure out what it was?

dbworld4k · 09-12-2015, 10:28 PM

Quote:

Originally Posted by rholden614

I have the same problem with my 08' 335i 6mt. did you ever figure out what it was?

Yup, my pressure plate was scorched. Clutch had decent life left but the PP wasn't holding up. Swapped to a 335iS kit and never had an issue since.

924er · 09-13-2015, 12:12 PM

That's why I got an automatic but I still miss my 6mt. Way more fun

Miller335 · 09-13-2015, 01:06 PM

Quote:

Originally Posted by 924er

That's why I got an automatic

??

924er · 09-13-2015, 03:41 PM

Quote:

Originally Posted by Miller335

Quote:

Originally Posted by 924er

That's why I got an automatic

??

Meaning I didn't wanna deal with clutch problems

Miller335 · 09-13-2015, 04:16 PM

Quote:

Originally Posted by 924er

Meaning I didn't wanna deal with clutch problems

If you're only ever going to stick to stock turbos I would agree.
Otherwise all bets are off and a simple clutch upgrade and it will hold whatever power you want to throw at it.

924er · 09-13-2015, 08:44 PM

Quote:

Originally Posted by Miller335

Quote:

Originally Posted by 924er

Meaning I didn't wanna deal with clutch problems

If you're only ever going to stick to stock turbos I would agree.
Otherwise all bets are off and a simple clutch upgrade and it will hold whatever power you want to throw at it.

Yeah this is my first 6AT car. Not as fun but I like that It can hold power without having to change parts: plus I'm getting old

07-21-2014, 10:13 AM	#1
dbworld4k Banned 583 Rep 2,233 Posts Drives: '12 M3 Join Date: Mar 2008 Location: YYZ iTrader: (5) Garage List 2002 BMW M5 [10.00] 2009 BMW 335i [10.00]	Revs suddenly climb then drop during WOT Installed my FMIC and upped my Cobb to Stage 1 + FMIC Aggressive. Noticed that during heavy throttle (ie. more than 50%) in 4th/5th/6th, the revs will shoot up almost like the clutch is slipping and then stabilize and the car continues to pull hard again. This doesn't happen if I take the tune off, which makes sense if the clutch is indeed on it's way out then stock power levels are less demanding of it. Anyone else experience this? Could this be boost related if there's a leak, or is it just the clutch?
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07-21-2014, 10:25 AM	#2
Miller335 Colonel 291 Rep 2,189 Posts Drives: 2007 E92 Join Date: Oct 2013 Location: Portland, OR iTrader: (0)	Sounds exactly like a slipping clutch. If you log you will see a plateau in your rpm during the event.
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09-12-2015, 06:23 PM	#3
rholden614 Registered 0 Rep 1 Posts Drives: 2008 335i Join Date: Sep 2015 Location: Va iTrader: (0)	Same problem I have the same problem with my 08' 335i 6mt. did you ever figure out what it was?
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09-13-2015, 12:12 PM	#5
924er Colonel 352 Rep 2,050 Posts Drives: e92 335i '10 Join Date: Feb 2014 Location: Socal iTrader: (0)	That's why I got an automatic but I still miss my 6mt. Way more fun __________________ '10 e92 N54 DCI intakes, ER chargepipe, TIAL BOV, VRSF 5in FMIC, BMS Downpipes COBB e30
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