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      06-28-2010, 02:26 PM   #23
henryyxyu
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Why would you want to rev the engine that high anyway? 8400RPM is plenty already. If you have a 9000RPM fetish or something, get an AP1 S2000. As some said before, a tuner could bump it to 9000RPM but no guarantee that the motor would last. (after all the stock internals are designed for the 8400RPM redline)
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      06-29-2010, 05:13 PM   #24
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      06-29-2010, 06:25 PM   #25
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There are a couple of tuners that have tweaked around with redline for the DCT and increased it. A couple of cars went to limp mode and had issues when revving it up that high because there was error code with the DCT software limiting the amount of revs to the car.

I don't know the specific details about this but there was some issues with aftermarket tuners raising the rev limit on DCT cars; but I can't be sure because this was about a year ago and maybe the tuners have already managed to get around this code.
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      06-30-2010, 01:02 AM   #26
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Max I have seen is 8600rpm.
I am sure it can be done, however it would be a detriment to the longevity of your engine.

EDIT: I saw this in another thread:

Quote:
Originally Posted by Levi View Post
Yes. Noelle Motors does lift the redline up to 8.800 rpm for DCT in manual mode, when you get their 3.45 final drive and tune.
EDIT 2: The DCT has been rev'd to 9000rpm by Xcede Performance in South Africa.



Quote:
Originally Posted by M&M
Xcede Performance of South Africa is the first tuner to surpass the 8600 rpm DCT limit.

Yeah I am a co-owner of Xcede Performance. We have managed to get a DCt to rev 9000rpm. In fact we can get it to rev pretty much anywhere we want. And I can assure you it's not easy. BMw have hard-coded the rev-limiter outside the flash area in the DCT DME. We had to be rather innovative to make it rev there. But the car does peak around 8500-8500. But the good part is that it does not drop off to 8800rpm. It's relatively flat. So there is a definite benefit to revving 8800, evein if it peaks a few hundred rpm before that.
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      06-30-2010, 03:58 PM   #27
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Quote:
Originally Posted by SuperlativE90 View Post
EDIT 2: The DCT has been rev'd to 9000rpm by Xcede Performance in South Africa.

Impressive! 9k rpm redline will really add some significant performance gains for the M3. Have you seen any reported numbers?
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      06-30-2010, 05:10 PM   #28
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Seems safe enough to me.

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      06-30-2010, 07:35 PM   #29
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Quote:
Originally Posted by kc1337 View Post
/thread
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      06-30-2010, 07:42 PM   #30
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Quote:
Originally Posted by alpina527 View Post
Seems safe enough to me.
Except for the problem that the M3 uses a Getrag not a ZF unit...
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      06-30-2010, 09:06 PM   #31
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I'm sure it could be done but I wouldn't chance it. Perhaps if the car were strictly for racing I would, but not for a daily driver.

As speed grows, stress grows as the square of the speed. A few hundred RPMs after 8000 produce a greater stress on the parts than the stress from the same few hundred RPMs after, say, 6000 RPM. So at some point, a little bit higher redline will increase risk disproportionally. And 8400 is already pretty darn high.


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      07-03-2010, 01:38 PM   #32
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Engine is known to be tested to 8700rpm.

We have raised it to 8600rpm.

Will post a dyno graph to show how much difference it makes.
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      07-03-2010, 01:51 PM   #33
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chuck norris once revved the m3 engine to 11000 rpm and instead, he voided the dealer.
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      07-03-2010, 07:39 PM   #34
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No point on a street driven car... not even on a tracked street car... maybe for a dedicated race car effort with a team with a motor budget... not even worth risking the kaboom for .1 sec.
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      07-04-2010, 03:07 AM   #35
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Quote:
Originally Posted by smmmurf View Post
No point on a street driven car... not even on a tracked street car... maybe for a dedicated race car effort with a team with a motor budget... not even worth risking the kaboom for .1 sec.
I understand and agree with this sentiment. The contrary point of view is also valid - no risk no reward.

It is difficult to answer the question of exactly how much margin of design the most stressed engine internals have (or what ever is the most stressed part would be) at that rpm. There is typically a fairly large margin for all "consumer" designs even in one like the M3. Of course the margins in an M3 will typically be less than those in an engine revving to only 6 or 7k rpm. Much of the entire spirit and fun of modding is simply taking some risk and gaining the reward. For those who are more conservative it obviously does not make sense. However, there will always be those for whom it is worth it. The good thing is that the former group can take advantage of the empirical evidence gained by the latter and perhaps change the camp they are in.

Personally I am in the conservative camp (at least with this car). At the same time I would LOVE to hear her sing at 9k...
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      07-09-2010, 10:59 PM   #36
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Quote:
Originally Posted by OMID INC View Post
chuck norris once revved the m3 engine to 11000 rpm and instead, he voided the dealer.
+100000000000000000000000000000000000000
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      07-09-2010, 11:12 PM   #37
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If this car was a pure race car the benefits would be great!! Stay away from this whole idea if it's a daily driver. You will def not feel it. Plus I doubt you will keep your daily driver in pristine condition so other issues together with the higher rpm would destroy your engine over time. You can even do damage to your engine when you first get it if you don't break it in properly the first 3k miles.
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      08-28-2011, 06:24 PM   #38
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Have you ever find out if the DCT can be rev at 9000+rpm?

Quote:
Originally Posted by M&M View Post
Does anybody know if any chuptuner's have successfully been able to raise the rev-limiter on a DCT to 9000rpm? I know the manuals can.

I don't want to know if it's good or bad to do so, just want to know if it's technically possible in software.

Have you ever find out if the DCT can be rev at 9000+rpm? The engine can be rev at 10k with proper mods.
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      08-28-2011, 07:05 PM   #39
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The S65 and S85 engines would achieve a piston speed of 25M/S at 10'000RPM witch would make it close to a stock S54 engine from the E46 M3 (24.27M/S) and actualy lower then a F20C Honda S2000(25.2M/S). I am prety sure that the rod bearings of the BMW S85/S65 are much more stronger then the S54 M3 being that the new S65 is a evolution of the S85 and in turn the S85 is a evolution of the S54 especially after all the rods bearing failure in the early E46 M3. To spine at 10'000RPM and make power there I'll suggest having crower build you custom: titanium rods with their strongest bearings and lightes piston with every upgrade you can performe on them like coating..... To minimize drag/friction and to finish have them lighten up the crankshaft then have VAC motorsport build you stage 3 heads they are capable of 150hp per liter. You'll also need better engine breathing( exhaust, intake). With lighter internals and stronger bearings the engine can spin at 10K safely as the load is reduced, friction is reduced, piston speed is similar of a stock E46 M3, wen I said safely I mean as safe as a 1000cc bike revving @14'000RPM. Now how is the tranny handle 10K I don't know.
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      08-28-2011, 07:18 PM   #40
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Quote:
Originally Posted by Sal@Evolve View Post
Engine is known to be tested to 8700rpm.

We have raised it to 8600rpm.
mine is set at 8600. dont live there by any means but get above 8000 now and then.
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