beef up step tranny?

Luke WL. · 01-25-2004, 09:35 PM

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?

gmhl10 · 01-26-2004, 04:35 AM

Quote:

Originally Posted by Luke WL.

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.

325i-Vizon · 01-26-2004, 10:31 AM

i vant to know as well

teamdfl · 01-26-2004, 03:53 PM

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

Mr Paddle.Shift · 01-26-2004, 04:56 PM

Quote:

Originally Posted by teamdfl

You can't afford to go that fast.
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.

crazy1323 · 02-11-2004, 11:04 PM

Bump

xS3x · 02-12-2004, 12:18 AM

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

Mr Paddle.Shift · 02-12-2004, 06:18 PM

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

sfzBimmer2 · 02-12-2004, 07:38 PM

Quote:

Originally Posted by Mr Paddle.Shift

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?

xS3x · 02-12-2004, 09:07 PM

I doubt the tranny will bolt up though?

Chi-Town · 02-17-2004, 04:43 PM

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.

Mr Paddle.Shift · 02-17-2004, 05:00 PM

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.

crazy1323 · 02-18-2004, 09:48 PM

so how much power can the ZF transmission hold?

01-25-2004, 09:35 PM	#1
Luke WL. Registered User Join Date: Mar 2003 Location: Fort Myers, FL Posts: 838 My Ride: 2003 ///M3 View My Garage	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? __________________ old New

01-26-2004, 10:31 AM	#3
325i-Vizon I hate grad school. Join Date: Aug 2002 Location: Bloomington, IN Posts: 2,050 My Ride: 2001 325i View My Garage	i vant to know as well __________________

01-26-2004, 03:53 PM	#4
teamdfl Lemony Fresh Join Date: Dec 1969 Location: Awesome, NJ Posts: 3,976 My Ride: Rattle trap View My Garage	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 __________________ Mod the driver first. Participate in your local BMWCCA driving school. Have you joined BMWCCA yet? My Track Schedule

02-11-2004, 11:04 PM	#6
crazy1323 Registered User Join Date: Mar 2003 Location: Memphis Posts: 873 My Ride: '02 330Ci View My Garage	Bump __________________ '02 330Ci A Bimmer, a Porsche, and an old Dodge, I am too lazy to list and update.

02-12-2004, 12:18 AM	#7
xS3x mi casa @ technik Join Date: Dec 1969 Location: Taipei Posts: 6,298 My Ride: 2002 330Ci View My Garage	i have a steptronic transmission for sale if anyone needs it for a rebuild __________________ EUROPROJEKTZ car for sale.. http://forum.e46fanatics.com/showthr...61#post4963161

02-12-2004, 06:18 PM	#8
Mr Paddle.Shift PhD Mech. Eng. Join Date: Dec 1969 Location: By that double apexes Posts: 1,987 My Ride: B3 epsilon View My Garage	You need a ZF 5HP24. This is what Alpina uses in their B10 V8s and V8 Roadster. __________________ Technik Engineering ASA Stage 1. Supercharged E46 M54B25. NASA TTD So Cal. Track blog.

02-12-2004, 09:07 PM	#10
xS3x mi casa @ technik Join Date: Dec 1969 Location: Taipei Posts: 6,298 My Ride: 2002 330Ci View My Garage	I doubt the tranny will bolt up though? __________________ EUROPROJEKTZ car for sale.. http://forum.e46fanatics.com/showthr...61#post4963161

02-17-2004, 04:43 PM	#11
Chi-Town Registered User Join Date: Feb 2004 Location: Chicago Posts: 78 My Ride: 01 325i View My Garage	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.

02-17-2004, 05:00 PM	#12
Mr Paddle.Shift PhD Mech. Eng. Join Date: Dec 1969 Location: By that double apexes Posts: 1,987 My Ride: B3 epsilon View My Garage	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. __________________ Technik Engineering ASA Stage 1. Supercharged E46 M54B25. NASA TTD So Cal. Track blog.

02-18-2004, 09:48 PM	#13
crazy1323 Registered User Join Date: Mar 2003 Location: Memphis Posts: 873 My Ride: '02 330Ci View My Garage	so how much power can the ZF transmission hold? __________________ '02 330Ci A Bimmer, a Porsche, and an old Dodge, I am too lazy to list and update.

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