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Braap · 02-17-2013, 11:42 PM

So I've had my car out several times now and regularly am having drivability issues at race speeds. The car is a 2013 135is DCT, it does have a JB4 tune and BMS intake.

What happens is severe sputtering/power loss when shifting at higher RPMs. Just today however, it professed to throwing a CEL and reduced power mode on me. I shut the car down and re started it immediately, everything was fine again. Makes no sense to me.

It is also notable that I tried running the stock tune, bypassing the JB4 completely, and experienced the same issues.

Anyone have any input?

02-17-2013, 11:42 PM	#1
Braap Banned 11 Rep 183 Posts Drives: AW 2013 135is Join Date: Nov 2012 Location: Los Angeles iTrader: (3)	135is issues at the track... So I've had my car out several times now and regularly am having drivability issues at race speeds. The car is a 2013 135is DCT, it does have a JB4 tune and BMS intake. What happens is severe sputtering/power loss when shifting at higher RPMs. Just today however, it professed to throwing a CEL and reduced power mode on me. I shut the car down and re started it immediately, everything was fine again. Makes no sense to me. It is also notable that I tried running the stock tune, bypassing the JB4 completely, and experienced the same issues. Anyone have any input?
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