[sajakh]

The ZF designation for this auto is 6HP28 for a max torque of 700Nm (516 ft-lbs). Interesting tidbits about the future of auto vs DSG.

http://www.just-auto.com/article.aspx?id=90340

[bmwzimmer]

The Xede/PROcede/Prana? is already making 405 ft/lb @ the wheels with exhaust and 93 octane, you're looking at around 460-480 at the crank already so guys with 6AT's need to be aware that they are approaching this limit....

[2007/335i/coupe]

Originally Posted by bmwzimmer

The Xede/PROcede/Prana? is already making 405 ft/lb @ the wheels with exhaust and 93 octane, you're looking at around 460-480 at the crank already so guys with 6AT's need to be aware that they are approaching this limit....

There was discussion about drivetrain losses and that it's more a fixed value rather than a percentage when power has been increased. Assuming this, it's more likely around 445lb-ft. Since the car is probably underrated and actually has about 320 to 325lb-ft instead of the advertised 300, that would be loss of roughly 40lb-ft (my car put down 282lb-ft before the Xede, 358lb-ft after Xede). But it is amazing how fast the limit is approaching!

[grkm3]

Im sure the trannys can take some abuse...BMW is known to have solid tranny's

There are plenty of people making over 600whp with stock e36 M3 transmitions over on bimmerforums

If anything,the tranny is not the problem,its breaking other things with the added power,like rear ends,diff bolts,shock mounts,drive shafts ect.

[Dannys M3]

[ArmyBimmerDude]

Originally Posted by Dannys 335i

+1

[Soupboy]

That makes sense...(pause)...NOT!

Originally Posted by Brisk

^^^^ im sure we are gonna see those come very quick just give some people time and some mileage....

two downsides to the PROcede, might void warranty, its a risk some people dont wanna take my cuzin has a cold air intake on his 328xi his service engine soon light came on and he was just scared to bring it to the dealer, didnt wanna loose his engine warranty his jaw dropped but overnight it went away, but not after he took the whole cold air system off and put stock one back on. if he had a PROcede and something like that happen, go to ur dealer with fingers crossed espcially when a check engine light comes on and they plug the comp in or somethign .. and the other being the toll it might take on drivetrain parts and other components. im sure the car wont last as long as a stock engine will, more wear and tear of course on all the cars parts, imo the HP gain and lb ft. gain are awesome, downside= wear and tear goes up by alot, also downside warrany risk, another downside, not the most impressive times.

[OCNYBMW]

The other thing to consider is that they are using the same tranny for the diesels. They are already pushing high torque, so the tranny are able to take it.

[OpenFlash]

Originally Posted by Brisk

it does give performance but not the performance i was being lead to believe...

With an exhaust and PROcede, on 91oct gas, the car trapped the 1/4 mile at over 111mph. This is at sea level with stock tires and a bad 60'. That's 6-9mph faster than stock cars tested on the same track. That's a pretty big difference

just my 2c,
shiv

[IrishFlush03]

Originally Posted by shiv@vishnu

With an exhaust and PROcede, on 91oct gas, the car trapped the 1/4 mile at over 111mph. This is at sea level with stock tires and a bad 60'. That's 6-9mph faster than stock cars tested on the same track. That's a pretty big difference
shiv

What exhaust were you running here?

[OpenFlash]

Originally Posted by IrishFlush03

What exhaust were you running here?

Just a crush-bent prototype cat-back exhaust we had made a muffer shop. Nice sounding but nothing fancy.

[OpenFlash]

Originally Posted by Brisk

ur right Shiv it is, just the numbers i was guessing to be abit better, but i guess this can because of traction of course but a PROcede equipped 335i with 93 octane would have to buy better tires and wheels to take full advantage of the extra power correct to get the numbers were hoping for with the extra power? and what do u think about the trannys capabilities?

http://www.e90post.com/forums/showth...4&goto=newpost


thanks for the info and replys.



-lumi

No problem. As for numbers, the only real numbers that matter when it comes to talking about power output is trap speed. As for traction, the car hooks up far better on a street than it did at the drag strip. I actually get traction in 2nd gear on the street and I have logs to prove it. 0-60mph in 4.3-4.4 seconds

The only real problem with dragstrip style acceleration results is that revs are always above 5000rpm which means at no time are you taking advantage of the 100+ extra lbft of torque between 2500rpm and 4000rpm-- the range in which you drive in 95% of the time!

cheers,
shiv

[sajakh]

Shiv, I have a question,


For those who have an auto tranny, can you comment in your professional opinion about whether this tranny can take an additional 60-75 lb-ft of torque. I know you may have a bias since you are selling this, but for the past several months I have been watching your posts and am impressed with you professionalism and knowledge.

We know about the "pay to play" rules of tuning but do you think this particular tranny is at its limits in terms of torque handling ability stock?

Thanks in advance.

[Shawn_speed]

What is interesting about the OP's linked article is that it does not link a specific transmission model to a specific BMW model. There is another thread in the general e90 section where the OP claims ZF tech support have responded to him directly and claimed that the e92 335i uses the HP21 tranny.

I don't have a dog in this fight since I am allergic to autos but it would be nice to know for sure.

Shawn
Self appointed N54 is not based on M54 police
Phoenix

[Shawn_speed]

This article seems to confirm 6HP28 is in the 335i's

http://www.zf-mediacenter.de/sea_vie...ts=&ft=&lang=e

[Move.Over]

Originally Posted by Shawn_speed

This article seems to confirm 6HP28 is in the 335i's

http://www.zf-mediacenter.de/sea_vie...ts=&ft=&lang=e

Not what BMW is telling us, see attached PDF for the E93

6HP19TU for 335i = 6HP21 according to ZF = 450 Nm
6HP26TU for 330d = 6HP28 according to ZF = 700 Nm

[DrM]

Originally Posted by Move.Over

Not what BMW is telling us, see attached PDF for the E93

6HP19TU for 335i = 6HP21 according to ZF = 450 Nm
6HP26TU for 330d = 6HP28 according to ZF = 700 Nm

Surely that is unique to the convertible. The 6HP21 is only able to handle 332 ft-lb of torque (if my calcs are correct). Maybe they switched to the 6HP21 to save weight?

A PROcede modified car will eat those automatics transmissions if that is the case...

Is there a code on the trans that someone can check? (I have a manual...)

[Move.Over]

Originally Posted by DrM

Surely that is unique to the convertible. The 6HP21 is only able to handle 332 ft-lb of torque (if my calcs are correct). Maybe they switched to the 6HP21 to save weight?

A PROcede modified car will eat those automatics transmissions if that is the case...

Is there a code on the trans that someone can check? (I have a manual...)

Can't find a PDF for the E92, but here is one for the E90, same as the E93.

Hard to check the tranny, you have to remove part of the belly pan.

[DrM]

Originally Posted by Move.Over

Can't find a PDF for the E92, but here is one for the E90, same as the E93.

Hard to check the tranny, you have to remove part of the belly pan.

WOW...that shows the 335 in Europe using the 6HP19, which was apparently replaced by the 6HP21.

ZF rates the 6HP19 at 400nm (295 ft-lbs) and the 6HP21 at 450nm (332 ft-lbs) (1nm = 0.7375 ft-lbs).

I doubt that ZF designed enough strength into the transmission to handle ~550nm (405 ft-lbs) from a PROcede equipped car. If BMW had installed the 6HP28, there is room to spare but probably not with the 6HP21 or the 6HP19. A 25% increase in torque over the designed numbers is huge.

We will probably start hearing about failures of the automatic transmissions in PROcede equipped cars. That much torque over designed specs could cause all sorts of trouble. I suppose that only time will tell.

I am glad that I have a manual! I just have to worry about eating clutches

[Move.Over]

Originally Posted by DrM

WOW...that shows the 335 in Europe using the 6HP19, which was apparently replaced by the 6HP21.

ZF rates the 6HP19 at 400nm (295 ft-lbs) and the 6HP21 at 450nm (332 ft-lbs) (1nm = 0.7375 ft-lbs).

Note that it says 6HP19 TU ( i.e updated in BMW talk) , which is the 6HP21 in ZF talk. As you said the rating is 450Nm and according to the sheet the engine rating is 400Nm. So BMW gives it a 12.5 % margin.

[Rick1-10]

What will the manual hold?

[Move.Over]

Originally Posted by Rick1-10

What will the manual hold?

Should be ok with that, it is the ZF type G, the same one used in the M5.