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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > AT Hard Shifting at WOT...HELP!



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      Yesterday, 11:22 PM   #1
EP11
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AT Hard Shifting at WOT...HELP!

Hey everyone,

Recently my cars transmission seems to be acting up. The car is automatic but when I'm at WOT the car jerks/stutters very badly between 1st and 2nd. My car has VRSF downpipes, JB4 G5, Alpina Trans Flash, BT backend flash, and a drop in filter. Has anyone else ever experienced this problem? I've attached a video of my car doing it and if you watch closely the RPMs stutter/jerk badly when shifting between 1st and 2nd. This change is the only one that does this and the rest are smooth.

P.S. I know my car was extremely low on gas, the video was taken right before I pulled into the gas station. I very rarely drive my car with very low gas.

Thanks,
Elvis

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      Yesterday, 11:37 PM   #2
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1st and 2nd gear aren't the smoothest of all shifts. Mine are jerky too sometimes especially if I shift early when WOT.
U might have misfiring going on. Check that out first

Video looks okay to me but why are u redlining ? This ain't no v8. Shift at 5500rpm you have an n54!!

And damn Xi makes a big difference in 1st hear. I don't even take off on 1st anymore, my car would go sideways
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      Today, 10:16 AM   #3
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Yeah I'll check the misfires, the car has new OEM plugs less than 3,000 miles on them. However I have never changed the coils. And the reason the car shifted like that was because it was manually put into first and then proceeded to shift the rest of the gears automatically.

I'll look into replacing the coils and post back with what happens.

-Elvis
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      Today, 12:00 PM   #4
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DTC on or off?

And why you redlining it? that could be part of the issue.
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      Today, 01:26 PM   #5
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DTC on, like I said I manually put it into first and then let the car shift from there...I'm guessing that the general consensus is to just let in start from second
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      Today, 01:36 PM   #6
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if you are going to manually put it in 1st, you have to shift it out. otherwise it over revs and the shifting can be rough

and if you arent manually shifting when in manual mode, da fuq you putting it in manual mode for?
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