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      01-17-2013, 12:35 PM   #1
Second Lieutenant
09BMW335i's Avatar

Drives: 2009 335i
Join Date: Nov 2012
Location: northwest burbs, IL

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Has this happened to anyone

A few weeks back i added Macht Schnell cat-less downpipe and Clutch Mod to my 335i.

I have noticed now that all of a sudden when i down shift from 6-5 ( around 80-90 MPH) ( 3000-3500RPM) I get a spike in RPM after the clutchhas been released and re-engaged and I get on the gas.( 3500-4500) it almost seems like i am spinning the tires, but i know i am not.

Could this be the clutch slipping? or something else? I have auto clear for codes on due to the downpipe and havent noticed any other codes.

I recentley updated the JB4 to 15C and just saw a new update going to to install that tonight

I am thinking of taking the car to the dealer and disable the JB4 would i have voided the warrenty on the car with the downpipes?

The car is a 09 with 16K have 3 year extended war on it
I have a JB4, DCI and Downpipes.

Just want to make sure if I take it in what i need to do so if it is something the warrenty will cover it.
09 335i Sport --MHD (Tune by Wedge )--Inlet System by Trueform Technologies --Tial BOV--Macht Schnell Catless Downpipes--AMS FMIC--Walbro 455 LPFP--HPF Gen2 Exhaust--SPEC Stage 3+ clutch / billet steel flywheel--