JB4 RPM Jumping...Clutch Slip? - BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)

SunnyD · 11-16-2012, 01:57 PM

Ever since I installed my JB4, the RPMs will jump for a second between half and full throttle before accelerating. I don't think it's related to wheel spin since I don't hear anything out of the ordinary.

Could this be a sign of my clutch slipping? I notice it happening in 3rd gear on. Only mods are BMS DCI and I'm running map 1.

Thanks!

Spoolin Montego · 11-16-2012, 03:33 PM

How many miles on your car? It could also you're not used to how the turbo spools with increased boost.

SunnyD · 11-16-2012, 03:35 PM

Car has 39k miles. You might be right about me not being used to the turbos spooling since this is my first turbo car. Would going with catless DPs help the turbos spool faster?

alexmtl_135i · 11-16-2012, 04:25 PM

If your RPMs raise then it means the turbos have already done their job at this point.

Either clutch or tires slip, but in 3rd gear that sounds a little hard to make the tires slip.

Spoolin Montego · 11-16-2012, 04:28 PM

Quote:

Originally Posted by SunnyD

Car has 39k miles. You might be right about me not being used to the turbos spooling since this is my first turbo car. Would going with catless DPs help the turbos spool faster?

Downpipes definitely help them spool faster. Sometimes I feel like my clutch is slipping by the way it drives, but it's not yet. I drive it pretty hard too and mine holds good at 48k. You should have a lot more miles on that clutch with just intake and tune.

Dom1nique · 11-17-2012, 03:06 AM

Quote:

Originally Posted by SunnyD

Ever since I installed my JB4, the RPMs will jump for a second between half and full throttle before accelerating. I don't think it's related to wheel spin since I don't hear anything out of the ordinary.

Could this be a sign of my clutch slipping? I notice it happening in 3rd gear on. Only mods are BMS DCI and I'm running map 1.

Thanks!

If you are gripping on tires and clutch... are you feeling the pull when the RPMs slam upward??? If so, you just arent used to the turbo lag/boost. Keep checking to see about when you see it jump... remember where you are supposed to feel the boost! If it's happening at the right spot you can sleep peacefully!

11-16-2012, 01:57 PM	#1
SunnyD Lieutenant Drives: 09 135 6MT Join Date: Dec 2006 Location: Playa Vista, CA Posts: 422 iTrader: (0)	JB4 RPM Jumping...Clutch Slip? Ever since I installed my JB4, the RPMs will jump for a second between half and full throttle before accelerating. I don't think it's related to wheel spin since I don't hear anything out of the ordinary. Could this be a sign of my clutch slipping? I notice it happening in 3rd gear on. Only mods are BMS DCI and I'm running map 1. Thanks! __________________ 2009 AW/Blk 135 6MT - [JB4] [BMS DCI] 339whp 363wtq 2006 ///M5 - Gone 2007 ///M Coupe - Gone
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11-16-2012, 03:33 PM	#2
Spoolin Montego Second Lieutenant Drives: 09 135i Join Date: Mar 2012 Location: Orange County Posts: 214 iTrader: (0)	How many miles on your car? It could also you're not used to how the turbo spools with increased boost. __________________ 2009 135i 6 Speed \| aFe Downpipes \| Evolution Racewerks Intercooler \| aFe Dual Cone \| Cobb Stage 2+ \| Apex ARC8

11-16-2012, 03:35 PM	#3
SunnyD Lieutenant Drives: 09 135 6MT Join Date: Dec 2006 Location: Playa Vista, CA Posts: 422 iTrader: (0)	Car has 39k miles. You might be right about me not being used to the turbos spooling since this is my first turbo car. Would going with catless DPs help the turbos spool faster? __________________ 2009 AW/Blk 135 6MT - [JB4] [BMS DCI] 339whp 363wtq 2006 ///M5 - Gone 2007 ///M Coupe - Gone

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11-16-2012, 04:25 PM	#4
alexmtl_135i Private First Class Drives: N55 135i M Sport DCT Join Date: Oct 2011 Location: Montreal, Canada Posts: 176 iTrader: (0)	If your RPMs raise then it means the turbos have already done their job at this point. Either clutch or tires slip, but in 3rd gear that sounds a little hard to make the tires slip.