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      10-14-2008, 01:22 PM   #1
ihyln
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Can the new M3 handle a supercharger?

I'm in the midst of working out the details of getting a S/C built as a prototype which will go into production eventually. I can't divulge many details as it's in the infancy stages but I do have some questions.

It was noted that the DCT tranny can only handle about 440lb/ft. Would the long term reliability suffer as a result of the new torque being "close" to the max? Say 400lb/ft?

The engine is already running at a fairly high compression ratio, what kind of tolerances, if any are known about the S65 engine? What kind of boost would be tolerable before the internals would have to be beefed up? I understand this is brand new territory so I welcome any/all ideas and remarks.
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      10-16-2008, 10:31 PM   #2
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G power has come out with a S/C kit.
From the details provided, it doesn't look like they are doing anything to the tranny... but how the tranny holds out should really depend on the power/torque increase. I'm unsure if this mod is limited to the manual only or not...

http://www.g-power.de/934.html?&L=1&carid=6000

hope this gives you some information to compare...

cheers
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      10-17-2008, 02:16 AM   #3
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AA is working on one too.
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      10-17-2008, 05:22 AM   #4
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VF started working on theirs as well. The motor will handle an SC, the internals are pretty damn stout. Look at what the E46 M3 has done, it is a high rev, high comp motor as well.

Since the heads on the M3 flow so well, the gains with boost will be awesome.

I am not worried about the motor handling 5-7 psi, I am worried about the DCT coping with it. It is possible the DCT can be strengthened, but supposedly it is sealed for the lifetime. Time will tell on this one... VF's shop car is a DCT by the way.
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      10-17-2008, 08:35 AM   #5
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Thanks guys, the company that is offering it to me isn't going to give me any sort of warranty at all. I was basically told to find a 3rd party warranty that will cover these types of mods. Thing is, I looked around and didn't find anything that WILL cover these types of modifications.

Like Sticky noted I'm worried about DCT being able to cope with 420ft/lbs or something close to its max.
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      10-17-2008, 09:28 AM   #6
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Quote:
Originally Posted by ihyln View Post
Thanks guys, the company that is offering it to me isn't going to give me any sort of warranty at all. I was basically told to find a 3rd party warranty that will cover these types of mods. Thing is, I looked around and didn't find anything that WILL cover these types of modifications.

Like Sticky noted I'm worried about DCT being able to cope with 420ft/lbs or something close to its max.
Dude, not that my opinion counts for anything, but no way would I let a vender use my car for experimentation in a brand-new SC kit or even a tune for that matter. Don't do it, you will live to regret it.......

Just my .02.

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e46e92
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      10-17-2008, 09:43 AM   #7
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I don't mind letting them using my car but I need peace of mind in return and I'm not getting that so I will respectfully decline their offer.
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      10-17-2008, 12:32 PM   #8
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Quote:
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I don't mind letting them using my car but I need peace of mind in return and I'm not getting that so I will respectfully decline their offer.
good call.
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      10-17-2008, 08:40 PM   #9
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AA can accomplish anything. All the guys at AA know what they are doing, are class act & professional. I wouldn't do any serious mods with anyone else.
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      10-18-2008, 11:11 AM   #10
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Adding boost to a 12.0 CR motor is risky at best.....maybe 5 psi?

However the same exact DCT tranny that is in the M3 will be in the next M5-6 with its twin turbo V10 with well over 550hp....
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      10-18-2008, 11:21 AM   #11
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i would bet money that we will see at least 3 released FI kits within the next 3 years.

Even though the RPM range of the M3 does not play nice with turbos or superchargers, it will be done to break the 500hp barrier
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      10-18-2008, 04:06 PM   #12
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Quote:
Originally Posted by ScottyGams View Post
i would bet money that we will see at least 3 released FI kits within the next 3 years.

Even though the RPM range of the M3 does not play nice with turbos or superchargers, it will be done to break the 500hp barrier
Huh? The rev range and powerband is AWESOME for forced induction. Do you know how a centrifigual makes boost?
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      10-18-2008, 05:38 PM   #13
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oh, im sure it can MAKE power just fine. That is not what I meant by "play nice." My fault...

i am concerned with the lightweight aluminum engine at 8300rpm with 10 pounds of boost.

I cannot imagine the engine tolerating that stress long term
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      10-19-2008, 02:46 AM   #14
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Quote:
Originally Posted by ihyln View Post
I'm in the midst of working out the details of getting a S/C built as a prototype which will go into production eventually. I can't divulge many details as it's in the infancy stages but I do have some questions.

It was noted that the DCT tranny can only handle about 440lb/ft. Would the long term reliability suffer as a result of the new torque being "close" to the max? Say 400lb/ft?

The engine is already running at a fairly high compression ratio, what kind of tolerances, if any are known about the S65 engine? What kind of boost would be tolerable before the internals would have to be beefed up? I understand this is brand new territory so I welcome any/all ideas and remarks.
Shouldn't the company who's developing the S/C be doing this research not you. The fact that they are not offering a warranty would make me run, fast!
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      10-19-2008, 02:47 AM   #15
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Look at what has been done with the RS4 as well. Specs quite similar to the E92 M3, it can handle turbo or supercharging. Longevity is of course the big question. As far as the tranny I bet the exact same tranny from the M3 gets on to the new M5, it will probably have in the neighborhood of 420 ft lb (very rough guess - not following development there much at all) and since it is rated for 440 ft lb that should be completely fine.
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      10-19-2008, 05:30 AM   #16
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My only concern with putting even more torque is the surge. The more you used it the bigger the chance of failure in my opinion.
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