[FAM3]

So I asked this question in another thread, but no one seems to have a correct answer thought I would ask here.

I will be picking up an 335is soon and just had a quick question...can a 6MT version of a 335IS still have the overboost function? A friend of mine was stating that it is only a DCT option but I find that ridiculous.

If you just say NO or YES in the thread, that means nothing, can someone provide proof in anyway? Perhaps in a 6MT 335is manual there is something about the overboost? Someone with a 335is care to chime in?

Thanks guys! Great forum here!

[Q4P]

what would the TQ output of a car have to do with the transmission? The boost is ECU controlled and is irrelevant to the tranny unless there is an extreme amount of TQ that could damage it.

In other words; it's definitely for both.

[stratplaya06]

I'm pretty sure in the 6MT car it'll still run more boost than stock (accounting for the higher HP and TQ numbers) but in regards to the factory overboost feature (the one with 371 lb ft) it is DCT only.

...Get a tune and boost more than the overboost feature ever hopes to.

EDIT: I stand corrected, 6MT cars do, in fact, have the overboost function. Makes the 6MT even more desirable considering how delicate the 7DCT seems to be with any bolt-ons.

[AlterZgo]

Yes. Your friend is ridiculous. Of course the 6MT 335is has the overboost function. The manual is likely stronger than the DCT transmission.

I own a stock 6MT 335is and it has overboost and pulls significantly harder than a stock 335i.

As for proof, look at any BMW 3 series brochure or the website. No where does it state the overboost function is exclusive to the DCT cars only.

[PKizzle]

I've tried answering this in the other thread, but there is a ridiculous amount of misinformation being posted on it.

To answer your question, YES, the 6MT 335is has over boost. It is an integral part of the engine software that comes in under medium to hard acceleration conditions and is very noticeable. Anyone that has driven a regular 335 will notice the over boost immediately.

This has been documented ad nauseum on BMW tech specs, car mags, etc etc. Try to look it up sometime.

[Soliditude]

Originally Posted by Questforpower

what would the TQ output of a car have to do with the transmission? The boost is ECU controlled and is irrelevant to the tranny unless there is an extreme amount of TQ that could damage it.

In other words; it's definitely for both.

What he said.

[RaceBlood]

Oh YEEAA

[BQTuning]

Originally Posted by AlterZgo

Yes. Your friend is ridiculous. Of course the 6MT 335is has the overboost function. The manual is likely stronger than the DCT transmission.

I own a stock 6MT 335is and it has overboost and pulls significantly harder than a stock 335i.

As for proof, look at any BMW 3 series brochure or the website. No where does it state the overboost function is exclusive to the DCT cars only.

How do you figure that a 335is 6MT is stronger than the 335is DCT - the same transmission the DCT M3 uses ?

[Q4P]

Originally Posted by BuraQ

How do you figure that a 335is 6MT is stronger than the 335is DCT - the same transmission the DCT M3 uses ?

A manual transmission is almost always stronger than a comparable DCT or auto tranny... most of the time they can withstand more TQ. The 335is DCT as well as the 135i DCT began to slip above 380 WHP... I am also pretty sure that the M3 DCT is not the same that is used in the is.

[BQTuning]

Originally Posted by Questforpower

A manual transmission is almost always stronger than a comparable DCT or auto tranny... most of the time they can withstand more TQ. The 335is DCT as well as the 135i DCT began to slip above 380 WHP... I am also pretty sure that the M3 DCT is not the same that is used in the is.

First of all according to who reported this slippage ? Slippage happens when you apply to much throttle from a stand still, or to instant under 10 mph, before the clutch is fully engaged. This even happens at stock tune.....

Until I get a confirmation that slippage is happening with "Launch Control", that applies the clutch aggressively & instantaneously at the specified WHP it will be disregarded as a misunderstanding of the DCT

Since you mentioned the 135i DCT N55 you are obviously referencing Terry w/ BMS, as an authority, but what you dont know is how he is applying that power.

I can just about bet that he is experiencing slippage in his 60' . Hes got DRs, 17 PSI, meth/race Gas and I still beat him on his 60' with RFT stock tires running only 14 PSI and 93 octane. He just has not totally figured out the DCT yet.

Further more the 135i, 335i and the E92N M3 do in fact have the same EXACT DCT

135i DCT Model # GS7D36SG (part# 28007585538)
http://www.realoem.com/bmw/showparts...00&hg=28&fg=05

335is DCT Model # GS7D36SG (part# 28007585538)
http://www.realoem.com/bmw/showparts...00&hg=28&fg=05

M3 E92N(S65) DCT Model # GS7D36SG (part# 28007842585)
http://www.realoem.com/bmw/showparts...00&hg=28&fg=05

The difference in the part # for the M3 DCT is because it comes with a different Output Flang for the M3 Output Drive Shaft.

[Q4P]

Originally Posted by BuraQ

First of all according to who reported this slippage ? Slippage happens when you apply to much throttle from a stand still, or to instant under 10 mph, before the clutch is fully engaged. This even happens at stock tune.....

Until I get a confirmation that slippage is happening with "Launch Control", that applies the clutch aggressively & instantaneously at the specified WHP it will be disregarded as a misunderstanding of the DCT

Since you mentioned the 135i DCT N55 you are obviously referencing Terry w/ BMS, as an authority, but what you dont know is how he is applying that power.

I can just about bet that he is experiencing slippage in his 60' . Hes got DRs, 17 PSI, meth/race Gas and I still beat him on his 60' with RFT stock tires running only 14 PSI and 93 octane. He just has not totally figured out the DCT yet.

Further more the 135i, 335i and the E92N M3 do in fact have the same EXACT DCT

135i DCT Model # GS7D36SG (part# 28007585538)
http://www.realoem.com/bmw/showparts...00&hg=28&fg=05

335is DCT Model # GS7D36SG (part# 28007585538)
http://www.realoem.com/bmw/showparts...00&hg=28&fg=05

M3 E92N(S65) DCT Model # GS7D36SG (part# 28007842585)
http://www.realoem.com/bmw/showparts...00&hg=28&fg=05

The difference in the part # for the M3 DCT is because it comes with a different Output Flang for the M3 Output Drive Shaft.

I know nothing about Terry and his situation but Shiv@Vishnu has already said numerous times that the clutch has been slipping in his 135i DCT; he had issues with it consistently and it was one of the main reasons why he was unwilling to go above 380 WHP...

I'll let u deduce what you want to deduce; read the first paragraph -

http://www.e90post.com/forums/showth...+turbo+upgrade

And as far as the comparison to the M3 DCT... do 600 WHP supercharged DCT M3's have stock transmission or are they upgraded? Because if they are stock; then please enlighten me how a 135i's clutch was slipping with not even 400?

[hammick]

Originally Posted by Questforpower

A manual transmission is almost always stronger than a comparable DCT or auto tranny... most of the time they can withstand more TQ. The 335is DCT as well as the 135i DCT began to slip above 380 WHP... I am also pretty sure that the M3 DCT is not the same that is used in the is.

I though the 335d only came in an auto because the MT couldn't handle the torque.

[Q4P]

Originally Posted by hammick

I though the 335d only came in an auto because the MT couldn't handle the torque.

That's what they say but it's simply not fact. There are tuned 335i's that run over 450 WTQ which is considerably more than a 335d and have absolutely no problem with the manual tranny. I think in the d's case; the nature of the low revving motor made the auto transmission a better fit.

[BQTuning]

Originally Posted by Questforpower

I know nothing about Terry and his situation but Shiv@Vishnu has already said numerous times that the clutch has been slipping in his 135i DCT; he had issues with it consistently and it was one of the main reasons why he was unwilling to go above 380 WHP...


I'll let u deduce what you want to deduce; read the first paragraph -

http://www.e90post.com/forums/showth...+turbo+upgrade

Thanks for the link, now this is what he said for the reason for the clutch slipping

Originally Posted by shiv@vishnu

Before anyone starts to panic about the 7DCT, I don't think this is the natural failing point of the clutches. But rather a consequence of those several drag strip launches I did last year when running hoosier slicks where it would routinely trigger transmission over-temp warnings/limps. From that day onwards, our 7DCT would slip in the 2500-2700rpm range if we ran more than 13-14psi of boost on dyno. So I'd say that the clutches in our gearbox need to be replaced/upgraded from the abuse.

It is clear about the history of abuse on those clutches. This is the same thing that would happen to ANY manual transmission if you abuse it and will adventually start slipping.

Originally Posted by Questforpower

And as far as the comparison to the M3 DCT... do 600 WHP supercharged DCT M3's have stock transmission or are they upgraded? Because if they are stock;

I only know of one DCT M3 that was tuned with supercharger with that amount of HP. If we are speaking about the same project it took him almost year before he could upgrade his DCT clutched from a company called SSP . The owner admitted that he ABUSED and Tour Up his DCT from tracking so he decided to upgrade his clutched as it was time to

Originally Posted by Questforpower

then please enlighten me how a 135i's clutch was slipping with not even 400?

See Vish's very own statement.

[hammick]

Originally Posted by Questforpower

That's what they say but it's simply not fact. There are tuned 335i's that run over 450 WTQ which is considerably more than a 335d and have absolutely no problem with the manual tranny. I think in the d's case; the nature of the low revving motor made the auto transmission a better fit.

I like the auto in my 335d but I think a manual would also be great. I just traded in a Jetta Sportswagen TDI 6mt and the manual was much better than their DSG tranny IMHO.

[Dackelone]

Originally Posted by BuraQ

...Further more the 135i, 335i and the E92N M3 do in fact have the same EXACT DCT

135i DCT Model # GS7D36SG (part# 28007585538)
http://www.realoem.com/bmw/showparts...00&hg=28&fg=05

335is DCT Model # GS7D36SG (part# 28007585538)
http://www.realoem.com/bmw/showparts...00&hg=28&fg=05

M3 E92N(S65) DCT Model # GS7D36SG (part# 28007842585)
http://www.realoem.com/bmw/showparts...00&hg=28&fg=05

The difference in the part # for the M3 DCT is because it comes with a different Output Flang for the M3 Output Drive Shaft.

I'm curious to know IF the 135i, 335i and the M3 all share the same DCT trans?

Can you point me to a ZF document stating this?

[BQTuning]

Originally Posted by Dackelone

I'm curious to know IF the 135i, 335i and the M3 all share the same DCT trans?

Can you point me to a ZF document stating this?

Why would there be need of a ZF document stating this when RealOEM.com references the same DCT part # GS7D36SG ?

The difference between the three is the mechatronic's controller and the output flangs for the drive shafts.

I dont understand why you would need more documentation for this unless someone does not trust realoem.com as an official source for referencing parts ?

[xjarhed]

I own a 335is with a 6MT and there is simply no way 20 extra horses equates to the pull over a 335i. That being said, the 6MT is the reason I bought it over a 2008 M3 Vert. Plus, I use it as my daily driver and could not live with the MPG on the M3... It is truly a great ride. Looks like your avg 335i to those who don't know BMW's, but it stands out to those that do. You will love the 6MT and the overboost.

[bbarker]

I have a 6MT 335is and I don't really feel the overboost, ever. With that said, I typically drive with the traction control ON so there are times during acceleration when the light comes on and cuts down the power... perhaps it's limiting the overboost? I test drove the DCT and the overboost was very apparent - not so much on my 6MT.

However, the car is still a lot of fun to drive and has plenty of power.

[BQTuning]

To all those that preffer the MT over the DCT on the 335iS, there is no MT that can make up for this experience with a DCT regardless of how much control you feel you have with an MT

and I was born and raised on MT

[avocet]

Originally Posted by BuraQ

To all those that preffer the MT over the DCT on the 335iS, there is no MT that can make up for this experience with a DCT regardless of how much control you feel you have with an MT

and I was born and raised on MT

looks boring.

now this looks exhilarating!

[FAM3]

I don't know why this thread came back from the dead but this was a while ago. I ended up purchasing a 6MT 335is and am VERY HAPPY with my decision.