[omarmarji]

The outcome of this thread will determine my fate with the money i have for spending purposed obviously on my e90....

My 335 is undergoing a Single Turbo swap, now with that being said i'm basically afraid my auto trans will go kaboom like everyone elses...was there a solution discovered that no one knows about besides swapping to MT? if so what is it! if not then i will be ordering all the manual parts like i said my fate depends on the outcome of this thread. thank you

[Taron]

try swapping to 6hp26 from 335d, there are some thread on the net how this probably can be done, however noone tested, i'm on 335xi and I will go with mt on the last end, swapping to 6hp26 is my next try (

Originally Posted by omarmarji

The outcome of this thread will determine my fate with the money i have for spending purposed obviously on my e90....

My 335 is undergoing a Single Turbo swap, now with that being said i'm basically afraid my auto trans will go kaboom like everyone elses...was there a solution discovered that no one knows about besides swapping to MT? if so what is it! if not then i will be ordering all the manual parts like i said my fate depends on the outcome of this thread. thank you

[psychosinmylobby]

Originally Posted by omarmarji

The outcome of this thread will determine my fate with the money i have for spending purposed obviously on my e90....

My 335 is undergoing a Single Turbo swap, now with that being said i'm basically afraid my auto trans will go kaboom like everyone elses...was there a solution discovered that no one knows about besides swapping to MT? if so what is it! if not then i will be ordering all the manual parts like i said my fate depends on the outcome of this thread. thank you

What parts are you referring to is transmission specific?

There are a few people running ST and 6AT no problem. I would stick with the 6AT + Sonnax Zip Kit + new ATF until it blows then consider a swap (MT / DCT). This will allow more time for solutions to develop / get proven.

I think swapping to a 6hp26 is not proven to work / take the power. May or maynot cost you later on if it fails.

[omarmarji]

I already get trans fault codes for 4-5th gear slippage but I don't notice it at all but it goes away once the car is off I just think that's due to heat and low fluid but , zip kit ?

[psychosinmylobby]

Originally Posted by omarmarji

I already get trans fault codes for 4-5th gear slippage but I don't notice it at all but it goes away once the car is off I just think that's due to heat and low fluid but , zip kit ?

Is your ATF fluid low?

I used to have slippage (but no codes). I checked my trans while I did my *** and there was ATF all over the bottom side due to leaking mechatronics sleeve. Checked my ATF and it was low. Filled it back up and it never slipped even after the additional power.

Sonnax Zip Kit may give positive results but it isn't proven with numbers. But people have done it and reviewed it to have positive impact.

I don't want to get your hopes up tho, your slippage issues sounds much more serious since you got codes. If it is cheaper to do the swap now than later, you should do the swap.

[omarmarji]

But my trans doesn't slip at all the the funny part

[TwistedTuning]

if your trans doesn't slip i would just stick with it. keep good clean fluids in it and etc. then if it goes as stated go for the MT swap. just my opinion.

[omarmarji]

Originally Posted by TwistedTuning

if your trans doesn't slip i would just stick with it. keep good clean fluids in it and etc. then if it goes as stated go for the MT swap. just my opinion.

i share the same opinion, but i dont know if i should give the trans a chance or just go straight for the MT swap

[TwistedTuning]

I say give it a chance. I mean there are several people putting down pretty decent power with them. Maybe do minimal things to it for now to help it cope.

The Zip kit that was mentioned as stated seems to have good reviews. Definitely either upgrade or add a trans oil cooler to keep heat down as much as possible. and just see what happens.

[omarmarji]

good advise, i will take it, i already have my oil cooler set up and everything i just need to connect the lines now

[Race8877]

PURE TURBOS:


Insider ZF knowledge:

Replace your Front Stator bushing with the Omega upgraded part:

http://www.omegamachine.com/db/ZF6HP...hing%20kit.asp

The front stator bushing is what causes most 4th, 5th, and 6th gear problems. It can be done without disassembling the whole trans.

The front stator bushing is not only a shaft support bushing, but more importantly: seals oil pressure to the E clutch (4,5,6). The OE ZF bushing is inferior, the bearing babbitt fails especially with increased torque.

Our shop 135i OE bushing was worn out, with a measured clearance of .008", OE spec is .0015". The excessive wear bleeds off the much needed engagement pressure for the E clutch.

Most ZF6HP21 trans problems are caused by this bushing. But of course, trans shops won't tell you this.

[TwistedTuning]

Originally Posted by Race8877

PURE TURBOS:


Insider ZF knowledge:

Replace your Front Stator bushing with the Omega upgraded part:

http://www.omegamachine.com/db/ZF6HP...hing%20kit.asp

The front stator bushing is what causes most 4th, 5th, and 6th gear problems. It can be done without disassembling the whole trans.

The front stator bushing is not only a shaft support bushing, but more importantly: seals oil pressure to the E clutch (4,5,6). The OE ZF bushing is inferior, the bearing babbitt fails especially with increased torque.

Our shop 135i OE bushing was worn out, with a measured clearance of .008", OE spec is .0015". The excessive wear bleeds off the much needed engagement pressure for the E clutch.

Most ZF6HP21 trans problems are caused by this bushing. But of course, trans shops won't tell you this.

GREAT POST and very informative

[omarmarji]

i agree but damn im so convinced to manual swap it

[psychosinmylobby]

Originally Posted by Race8877

PURE TURBOS:


Insider ZF knowledge:

Replace your Front Stator bushing with the Omega upgraded part:

http://www.omegamachine.com/db/ZF6HP...hing%20kit.asp

The front stator bushing is what causes most 4th, 5th, and 6th gear problems. It can be done without disassembling the whole trans.

The front stator bushing is not only a shaft support bushing, but more importantly: seals oil pressure to the E clutch (4,5,6). The OE ZF bushing is inferior, the bearing babbitt fails especially with increased torque.

Our shop 135i OE bushing was worn out, with a measured clearance of .008", OE spec is .0015". The excessive wear bleeds off the much needed engagement pressure for the E clutch.

Most ZF6HP21 trans problems are caused by this bushing. But of course, trans shops won't tell you this.

Very interesting. Any DIYs out there for this?

Originally Posted by omarmarji

i agree but damn im so convinced to manual swap it

Until the 4l80e has been figured out, MT is the best option to handle power period.

[AUbeast86]

Great info! This could be worth doing on my spare transmission. I'll start tearing it apart to see just how involved it is.

[psychosinmylobby]

Originally Posted by AUbeast86

Great info! This could be worth doing on my spare transmission. I'll start tearing it apart to see just how involved it is.

It would be tremendous help if you could do a DIY if you are able to do this.

Looks like Sonnax makes a set for the 6hp21 as well with upgraded materials.

[Terry @ BMS]

The full lvl10 build is good for 600whp or so, at least for awhile. Beyond that there is no known AT solution. It becomes MT swap time.

[natedog7700]

A single swap on a AT is a recipe for disaster unless you plan on running no more power than standard RB's. Then what's the point?

[Ocean]

https://www.youtube.com/watch?v=zYxuHPV02gY

Pure porn

http://sales.omegamachine.com/ZF6HP19_Bushing_kit_p/14500.htm
$99

[psychosinmylobby]

So tranny removal is required. At that point, swap to a MT for sure.

[Dmac @ BMS/DMD]

Save yourself the headache later and MT swap it for now. Then 4L80E swap down the road whenever that kit is ready.

[omarmarji]

4l80 kit will cost more than a manual swap lol

[Van3]

What would one have to do for a manual swap? IS there any DIY ?

[omarmarji]

No but from my experience it's pretty straight forward

[psychosinmylobby]

Anyone know the hp/tq limits of a DCT + Dodson clutches? That's another option.