[NFS13]

[QUOTE=lawdude;723384]

Originally Posted by NFS13

Sorry, didn't realize I was dealing with a master troll. Please continue.

Troll? How are my posts trolling? Maybe if you posted something informative to either side I would not even have replied. Sorry for the "piss off" I am having a bad day.

[BayerischeMW]

from a Alpina B3 (335i) thread in the showroom:

http://www.alpina.ne.jp/models/b3_limousine/index.html

running that website through babelfish.altavista.com showed:

"4 doors 6AT SWT left handle"

perhaps this means 6 speed automatic transmission. if so, and Alpina runs 500 Nm on the tranny, unless they've beefed up the tranny, this is good news for steptronic 335i owners.

[DrM]

Originally Posted by BayerischeMW

from a Alpina B3 (335i) thread in the showroom:

http://www.alpina.ne.jp/models/b3_limousine/index.html

running that website through babelfish.altavista.com showed:

"4 doors 6AT SWT left handle"

perhaps this means 6 speed automatic transmission. if so, and Alpina runs 500 Nm on the tranny, unless they've beefed up the tranny, this is good news for steptronic 335i owners.

The automatic transmission in the 335i (6HP19TU/6HP21) is rated to handle 450Nm (332 ft. lbs.) of torque. The extra 50Nm in the Alpina shouldn't cause much of an increase in the rate of failure.

The reason that people were discussing it originally is that that the PROcede puts 405 ft. lbs. to the ground in Shiv's car. This is probably about 475 ft. lbs. of torque at the motor, which is about 644Nm.

I wouldn't worry about Alpina's measly 50Nm increase over rated specs. But, the almost 200Nm increase in the PROcede.... Well, only time will tell

[bmwzimmer]

Hey, is the torque rating basically how much the transmission can handle when the wheels are locked up? Locking up wheels and hitting the gas would put the maximum stress on the tranny since it's absorbing all the energy instead of just transfering it to other components and eventually the tires. Flooring the car until redline on the dyno vs locking the wheels up and flooring the car until redline is a big difference to the tranny... If this is the case, we shouldn't have any issues. Especially with this car's open differential, if 1 wheel locks up, the other one spins so the power will get transfered to the tires regardless and not be fully absorbed by the transmission.

[pauly1]

Hey, is the torque rating basically how much the transmission can handle when the wheels are locked up? Locking up wheels and hitting the gas would put the maximum stress on the tranny since it's absorbing all the energy instead of just transfering it to other components and eventually the tires. Flooring the car until redline on the dyno vs locking the wheels up and flooring the car until redline is a big difference to the tranny... If this is the case, we shouldn't have any issues. Especially with this car's open differential, if 1 wheel locks up, the other one spins so the power will get transfered to the tires regardless and not be fully absorbed by the transmission.

Ding, Ding, Ding. I couldn't agree more. It's really AWD cars with transfer cases, or running drag radials that you need to worry about. In theory the car could be making 500 lbs of torque, but as long as that energy has an out, such as the case with RWD 335 on stock tires, you don't need to worry. Your tires will break loose long before your transmission.

For you athletes out there, I'll use this anology. Why do you think there are so many more blown out injuries while playing on turf. Turf shoes and turf can cause a bad combination, they are designed to stick (as is the case with slicks and a properly prepared tracks). Your foot sticks while your knee continues to go forward or side to side. On grass, your foot slides out from under you, therefore no energy is absorbed by the knee. Same concept.

[bmwzimmer]

This is why there are posts here about the torque converter or electro nannies acting up when you try to brake torque at over 2200 rpm's. Doing this will cause the transmission/torque converter to absorb all of the torque which can break it.

[mesier1111]

Originally Posted by bmwzimmer

Hey, is the torque rating basically how much the transmission can handle when the wheels are locked up? Locking up wheels and hitting the gas would put the maximum stress on the tranny since it's absorbing all the energy instead of just transfering it to other components and eventually the tires. Flooring the car until redline on the dyno vs locking the wheels up and flooring the car until redline is a big difference to the tranny... If this is the case, we shouldn't have any issues. Especially with this car's open differential, if 1 wheel locks up, the other one spins so the power will get transfered to the tires regardless and not be fully absorbed by the transmission.

Nice. GREAT POINT!!!!

[G35revup]

There has to be some AUTO BMW's out there with supercharged/turbo applications running substantially higher torque numbers than the transmission is rated for, with proven reliability over a long period of time. I think that would provide some reassurance as to what the transmission can handle.

[zenmaster]

I read somewhere on an E60 M5 forum where an Alpina engineer didn't trust the 335i's stock manual tranmission to handle more than 500nm. Could be one of the reasons Alpina limited the engine power output for their B3.

Here's the source:
http://www.m5board.com/vbulletin/sho...t=88739&page=3

[G35revup]

Here is a alpina B3 Bi turbo 360hp 500nm with the same transmission as 335i.


Engine
Cylinder 6 in line
Capacity 2979 cm?
Compression ratio 1: 9.4
Max. power 265 kW/360 hp at 5500-6000 rpm
Max. torque 500 Nm at 3800-5000 rpm

Weight
Unladen (DIN) 1570 kg

Gearbox:
ZF 6HP19 Automatic with SWITCH-TRONIC

http://www.tuningnews.net/article.php?date=070409

[zenmaster]

http://www.autocar.co.uk/News/NewsAr...Series/225812/
"The new BMW M3 will get a seven-speed double-clutch gearbox as an alternative to the standard six-speed manual."
The max torque capacity of the new M DCT is 600 Nm (440 lb-ft). The max torque capacity of the 335i's auto (6HP 21) is apparently 450-500 Nm (up to 369 lb-ft).
So if you wanted more than 369 lb-ft of torque in your auto 335i, would a transmission swap with the M DCT be practical or even possible?

[x7original4x]

anything new on this subject?

[itsbrokeagain]

Originally Posted by zenmaster

http://www.autocar.co.uk/News/NewsAr...Series/225812/
"The new BMW M3 will get a seven-speed double-clutch gearbox as an alternative to the standard six-speed manual."

Hm using the same clutch setup as the M5 eh? I happened to take a look at the V10 sitting on an engine stand in training..and spied a copper metallic twin disc clutch attached to it. I drove the 6 speed manual version as well, and no crazy harsh engagement issues as one would expect with such a clutch setup.

[scottp999]

yawn

[x7original4x]

only if the auto could take more h/p, your pretty much maxed out w/ proceed

[WedgePerformance]

Originally Posted by SINasTER

The problem with the tech sheet PDF is that it only states the stock original tranny, not the M-Sport AT... The Sport package has the new ZF 6HP28 tranny in it plus the oil cooler and other tid-bits.

Sorry, but you probably need to do a bit more research. All petrol N54's in AT form were connected to the 6HP19TU. The only 335 that was ever coupled to a 6HP26TU was the diesel.

[TT3 iN NyC]

Oldest thread revival ever...

[raceyBMW]

Holy 5 1/2 year old thread bump, lol.

[tampaturbom3]

so apparently the AT has handled more torque than thought... I wonder what the sustained (over a decent amount of time) limit has been without declining performance or failure? I have the X-drive (to put power down on all 4 tires hoping to get traction like the GTR or 911 TT)

[DesertBMW]

guys, automatic transmissions are getting better. Now it is impossible to burn up the transmission, simply because DME detects the slip in the clutches and operates direct gear limp mode to prevent failure.

[Dave W.]

Originally Posted by DesertBMW

guys, automatic transmissions are getting better. Now it is impossible to burn up the transmission, simply because DME detects the slip in the clutches and operates direct gear limp mode to prevent failure.

but going into limp mode isn't fast either. When it's time to go fast it doesn't matter if the clutch packs burned up or the DME triggered limp mode, either way it's slow.

[BeGood69]

i had a 500WHP and 489WTQ for about 3 yrs on the 6hp21 with alpina flash no issues... the i went ST 787/727 wheels no issues yet is been about 12 mo, been at the track and on the street logging from 3-6 gear no issues...
I did that said, upgraded the VB and TC for Lv0 products.. as preventing maintenance for the ST. NO ISSUES...
Now im building my engine and went with the full build LV10 wo b reliable at 1000WHP... i will keep you all posted...

PS: the original tranny 6HP21 with LV10 VB and TC is for sell, $2500 + freight ($200 max) (perfectly working) all gears and never had issues with it... and it has the latest Alpina flash already loaded... which i luv... POC: 910-364-8118