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Forced Induction Forum Sponsored by Active Autowerke
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Old 09-08-2006, 01:54 PM   #1
laurentiucantar
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supercharged with steptronic

hey guys what do you think about mounting on a 330ci steptronic a kompresor kit?how is it going to work on a car with step?is it going to afect the tranny?
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Old 09-08-2006, 01:59 PM   #2
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It will give way. It's a matter of time. Everyone I know with a SC'd 3L M54 engine have problems with their step tranny. It will slip, refuse to shift up to 5th...etc. We're talking SK1 and above kits. Maybe the tranny can still take it with an SK+ kit. Don't know for sure.

They either rebuild it adding additional clutch plates or swap to manual.

Or you could drive your car really gently, which defeats the whole purpose of SC...

My car is a 320i with an SK1 kit with an 11PSI pulley. I swapped my 320i step tranny with an 330i step tranny. It's holding up ok but I can feel I'm really pushing the limit already. I run an ATF cooler to help prolong the life, but the torque output of my engine is already much more than the rating for a 330i step tranny. So you can imagine how much more torque an 3L engine will push out...

Last edited by chickenbutt; 09-08-2006 at 02:13 PM.
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Old 09-08-2006, 02:03 PM   #3
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i know that ess offers a new soft for step tranny-
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Old 09-08-2006, 02:12 PM   #4
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I don't think it's a matter of software.

A 330 step tranny hardware is designed to take maybe 345nm of torque MAX? I have friends who have SC'd their 3L and are pushing out more than 450nm of torque.

It's physically quite difficult for all the components to be able to take that kinda stress.
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Old 09-08-2006, 02:16 PM   #5
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from what i've gathered reading on here and other sites, from tuners to experienced individuals (Mr Paddle.Shift, MarvelPhx amongst others), keeping the power output at about ~300 hp and torque at ~295 lbs/ft (or lower) is the general consensus if you want to keep your transmission for a while. this power is achieved with a 5.5 or 6 psi pulley. there are certain ZF transmission models that handle high power better than others, Alpina uses one such ZF transmission in one of their cars (don't remember the exact transmission model - Mr Paddle.Shift does).

then there are members who have 330s @ 6.5 psi producing 330 hp (Shinobi) who has had no problems this far, and others with the same kit but headers and/or cams in addition who's had their transmissions fail.

personally i'd go with 300 hp to play it safe(r) - i put "safer" because there are no guarantees.
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Old 09-08-2006, 02:18 PM   #6
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I don't think it's a matter of software.

A 330 step tranny hardware is designed to take maybe 345nm of torque MAX? I have friends who have SC'd their 3L and are pushing out more than 450nm of torque.

It's physically quite difficult for all the components to be able to take that kinda stress.
what should i expect at?more details if u can
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Old 09-08-2006, 02:19 PM   #7
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what should i expect at?more details if u can
there are a lot of guys with step and sc
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Old 09-08-2006, 02:24 PM   #8
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As BayerrischeMW mentioned, just keep your boost low enough to keep your power and torque outputs low. You should be fine.'

If you want big fat power and torque, go manual.
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Old 09-08-2006, 02:27 PM   #9
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Originally Posted by BayerischeMW View Post
from what i've gathered reading on here and other sites, from tuners to experienced individuals (Mr Paddle.Shift, MarvelPhx amongst others), keeping the power output at about ~300 hp and torque at ~295 lbs/ft (or lower) is the general consensus if you want to keep your transmission for a while. this power is achieved with a 5.5 or 6 psi pulley. there are certain ZF transmission models that handle high power better than others, Alpina uses one such ZF transmission in one of their cars (don't remember the exact transmission model - Mr Paddle.Shift does).

then there are members who have 330s @ 6.5 psi producing 330 hp (Shinobi) who has had no problems this far, and others with the same kit but headers and/or cams in addition who's had their transmissions fail.

personally i'd go with 300 hp to play it safe(r) - i put "safer" because there are no guarantees.
do you have 300hp and steptronic?how manny km on board ?
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Old 09-08-2006, 02:28 PM   #10
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no, i'm not currently supercharged.

i've read up on this subject because it's interesting, because i'd like to get supercharged and because you learn a lot about your car from reading about forced induction (not only power figures ). with a steptronic transmission you really need to know what you're getting yourself into, what to expect and how to not blow up your transmission.
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Old 09-08-2006, 02:43 PM   #11
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no, i'm not currently supercharged.

i've read up on this subject because it's interesting, because i'd like to get supercharged and because you learn a lot about your car from reading about forced induction (not only power figures ). with a steptronic transmission you really need to know what you're getting yourself into, what to expect and how to not blow up your transmission.
is your car step too?what modification do you have on engine?
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Old 09-08-2006, 02:47 PM   #12
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I have the sk+ kit at 6.5 psi. Probably right around 300-310 chp. Dynoed at 245 at 5.5psi. Should be somewhere in the neighborhood of 255 right now. Its been running awesome for almost a year now. I can probably slap on some headers too, but don't want the car too loud.
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Old 09-08-2006, 02:53 PM   #13
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I have the sk+ kit at 6.5 psi. Probably right around 300-310 chp. Dynoed at 245 at 5.5psi. Should be somewhere in the neighborhood of 255 right now. Its been running awesome for almost a year now. I can probably slap on some headers too, but don't want the car too loud.
you have 245 rwhp?do u have step too?
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Old 09-08-2006, 04:25 PM   #14
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ya step... probably somewhere between 255-260 whp now
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Old 09-08-2006, 05:28 PM   #15
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^

i was just gonna say isn't boost limited to 6.5 psi on steps? they still make pretty damn good power though! nice car by the way-
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Old 09-08-2006, 06:37 PM   #16
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boost isn't "limited" in the sense that you can't boost more than 6.5 psi. you can always put on a smaller pulley and raise the boost.
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Old 09-08-2006, 09:00 PM   #17
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^

i was just gonna say isn't boost limited to 6.5 psi on steps? they still make pretty damn good power though! nice car by the way-
thanks but i to your 300+whp
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Old 09-09-2006, 02:13 AM   #18
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ya step... probably somewhere between 255-260 whp now
the Sk+ is the system which delivers about 55hp and it is without intercooler?
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Old 09-09-2006, 12:09 PM   #19
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the Sk+ is the system which delivers about 55hp and it is without intercooler?
yup, no intercooler.
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