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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 > Once Again - 6AT Auto Transmission - Anyone with high power please respond.



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      07-11-2016, 03:55 PM   #23
CeeWhizzle
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You'll most likely need to wait a few months to a year before a solid solution comes into play for the AT's. The level 10's seem to be a hit and miss and for 10k, that's really not worth it. I myself just decided to do the manual swap since I didn't want to just run the power anyways (750whp on a top mount single and e85) and risk destroying the AT trans. I have one available if any of you want it (for a great price too!) for testing/backup trans or whatever.

I loved the auto transmission in our cars due to its amazingly quick shifts and smoothness for daily driving. But when it comes to making power - a manual swap isn't all that hard nor is it costly in any way if done yourself. Plus, less moving parts, less chances of failures and cheaper maintenance. But I know what you mean when you say you want to keep the AT. Just need to be patient and wait on someone to engineer some quality upgrades for the transmissions internals/TC.
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      07-11-2016, 04:03 PM   #24
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Quote:
Originally Posted by wren57 View Post
Yeah but an AT with about 150 less HP can still hang with a MT

Just curious on the actual specs. Boost, actual HP, ETC
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      07-11-2016, 04:19 PM   #25
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Quote:
Originally Posted by Jeff@TopGearSolutions View Post
Just curious on the actual specs. Boost, actual HP, ETC
It's in the video description:

AT N54 (OEM 3.46 gearing)
-Pure Turbos Stage 2 (23psi peak, taper to 21psi)
-Dynonjet results were 570/513wtq

MT N54 (changed to 3.46 gearing)
-JpWorks PTE 6266 Gen1 TwinScroll (30psi)
-Dyno'd 737whp/674wtq
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      07-12-2016, 04:24 AM   #26
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I just did the pan and fluid swap on my 6AT with 7.5 quarts of Redline D4. Had 97K on the original fluid. Shifts are much more stout with authority now, and a little less slip under peak torque shifts.
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      07-12-2016, 05:59 AM   #27
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For the sake of argument and this question isn't directed at OP for obvious reasons, but for those that have done a Manual swap from 6AT, considering doing one, or others whom of which are worried about the 6AT longevity when pushing 600whp+, why not swap to DCT instead? From what I've read, it's around the same cost and it's arguable that the DCT can hold great power.

Just look at FBO F10 M5's running on DCT as well as M3/M4's.. am I missing something or?
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      07-12-2016, 09:49 AM   #28
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Quote:
Originally Posted by YouAreMyWorld View Post
For the sake of argument and this question isn't directed at OP for obvious reasons, but for those that have done a Manual swap from 6AT, considering doing one, or others whom of which are worried about the 6AT longevity when pushing 600whp+, why not swap to DCT instead? From what I've read, it's around the same cost and it's arguable that the DCT can hold great power.

Just look at FBO F10 M5's running on DCT as well as M3/M4's.. am I missing something or?
Getting everything to play correctly together takes work. Certain cars have modules in the ecu and other dont, ect. David with the vargas 135i did a dct swap recently and was talking about it somewhere on here (fb, bb, n54t). it turns out not to be as cheap as you think it will be.
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      07-12-2016, 04:09 PM   #29
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Quote:
Originally Posted by YouAreMyWorld View Post
For the sake of argument and this question isn't directed at OP for obvious reasons, but for those that have done a Manual swap from 6AT, considering doing one, or others whom of which are worried about the 6AT longevity when pushing 600whp+, why not swap to DCT instead? From what I've read, it's around the same cost and it's arguable that the DCT can hold great power.
DCT swap is far more expensive than MT swap. A used DCT trans alone will run you around $2000, while a 6MT can be had for $800. With the DCT you'll want to upgrade the clutch to hold more power. I believe the only solution currently is Dodson which is around $3500. Upgraded 6MT clutch and flywheel are far far cheaper. I know some people have been slipping the DCT transmission, but can't find the threads with the numbers.

Then depending on your year, you may need a to get a new MSD81 ECU for the DCT trans. And a new DSC pump.

I priced out a 6MT swap last year using mostly used OEM eBay and junkyard parts and it was just under $2000 not including labor. Obviously you'll want to upgrade the clutch and flyhweel at the same time.
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      11-17-2019, 04:06 PM   #30
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So it's been a couple of years since this thread was made and I was wondering if there has been any advancements with the 6at transmission. My car has upgraded turbos and it is only a matter of time when it will fail with the added power. Just not sure which direction I should take when it fails..

1. Buy another used 6at until it blows up again.
2. Convert it to a manual car
3. Buy a manual car and transfer over all of the mods

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      11-18-2019, 03:49 AM   #31
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Quote:
Originally Posted by ragingpanda View Post
So it's been a couple of years since this thread was made and I was wondering if there has been any advancements with the 6at transmission. My car has upgraded turbos and it is only a matter of time when it will fail with the added power. Just not sure which direction I should take when it fails..

1. Buy another used 6at until it blows up again.
2. Convert it to a manual car
3. Buy a manual car and transfer over all of the mods

you could try upgrading the AT trans and flashing it with xhp
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      11-18-2019, 01:58 PM   #32
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How much extra torque holding ability does the xHP stage-3 flash add to the stock transmission?
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