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SINasTER SINasTER is offline
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Posts: 79
Join Date: Dec 2015
Car: BMW 335xi E90
Exclamation N63 with N20 TMAPs probelms - 04-04-2020, 02:40 PM

Hello all,

I have somewhat of a pickle happening right now. I have upgraded my TMAPs with 3.5bar (N20) and since first start I have issues.

Obviously, I enabled the N20 fonction in the JB4 settings before starting the car.

First start was hellish, got multiple codes for both TMAPs including a short to ground signal, extremely rough idle and engine died... restarted and idle was ok, so I cleared the codes.

Let engine idle for a couple minutes and drove about 10 minutes after that while taking it easy and ramp it up to more throttle. But I get rough acceleration if I push it a bit more than regular driving.

The pickle on top of that is that now, I donít have any boost displayed on my JB4 screen and the u/o boost dial always displays a negative value.

Canít figure out anything about this, need help!

Thanks 🙏


BMW 550 M-Sport xDrive 2011
HPE DME Stage 2 tune
JB4 backend flash
Custom valved exhaust with 3" quad tips
Custom 3" D.P.s
ESR RF2 19" wheels
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