beef up step tranny?
 

Ive heard that the step tranny can only hold about 300hp and 310lb/ft torque? if this is true (if i were to get a turbo) is there a way to beef up the tranny to hold some where arround 370 hp?

Me wants to know too!!!
For "educational" purposes. ;)

i vant to know as well :craig:

You can't afford to go that fast.


Actually, I have heard of guys getting performance rebuilds on factory ZF slushboxes with improved bands, clutches, sprags, and whatever the hell else keeps an automatic from grenading. The problem is cost. A ZF reman runs $2k + and a performance slushbox will run at least double that if you can find anyone who will stand behind their work. Don't forget about a larger transmission cooler too. If you want a higher stall speed, plan on spending $1k + for a custom torque converter.


Ed

Bingo.

I have a Step and somehow I am not bothered by this. I see it as a way to curb my mod-spending habit. As of now, the car is more than what I need for track events. In fact, the first thing I did after installing ASA was to track the car, not to dyno. :loco:

Bump

i have a steptronic transmission for sale if anyone needs it for a rebuild :thumbup:

You need a ZF 5HP24. This is what Alpina uses in their B10 V8s and V8 Roadster.

Would this be an easier swap than a manual transmission swap, in terms of software especially?

I doubt the tranny will bolt up though? :dunno:

Isn't the e46 auto trans gm/pontiac though? With that being said couldn't you just have a transmission shop rebuild it? I know there has to be someone running some type of F/I on an auto trans.

I have to clear something up as well. So there are two models of Steptronic tranny available and the corresponding E46s.

A5S 360R GM 5

323i/Ci/Cic :6/98 to 3/00,323it:1/00 to 3/01,
328i/Ci/Cic:6/98 to 6/00,330Xi:from 6/00,
325Xi:from 9/00


A5S 325Z 5HP 19 ZF

323i/Ci/Cic :3/00 to 8/00,323it:from4/01,
330i/Ci/Cic:from 6/00,325i/Ci/Cic:from 9/00

A lot of people have disputed that the GM model is less than satisfactory compared to the ZF one. Fact is, the GM model is not a part that is taken off the shelves but a part BMW has modified. This is done through the GM Power Train Division of Strasbourg in France. Note that GM Europe and GM USA have very different design philosophies.

so how much power can the ZF transmission hold?