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02-14-2012, 06:40 PM | #1 |
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Clutch Drop Vs Launch Control
So I searched for this and couldn't find any answer. I am wondering what is the mechanical difference between 6MT clutch drop and DCT launch control? Sorry if I am totally off.
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AW|FR 6MT E92 ///M3 Last edited by Prince_of_Persia; 02-14-2012 at 11:19 PM.. |
02-14-2012, 06:53 PM | #5 |
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Assuming you're dropping your clutch at 5,500 RPM (or the same rev as launch control), the only difference is that the 6MT won't shift for you. Other than that, there should be no difference, as all traction control nannies need to be off for LC to be active.
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02-14-2012, 07:05 PM | #6 |
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Think launch control slips the clutch and tries for more traction. A bit different than just dropping the clutch.
Last edited by sensi09; 02-14-2012 at 07:17 PM.. |
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02-14-2012, 07:25 PM | #7 |
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I would imagine since launch control for all intents and purposes is a computer driven operation, it's a little easier on the drivetrain and related components. I believe your gonna burn out a clutch on hard launches before you wear out a DCT completely. A hard launch in a manual is a much less precise operation therefore goodbye clutch faster. Of course my opinions have no basis in fact, as usual.
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02-14-2012, 07:25 PM | #8 | |
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Doing a WOT drop clutch in a 6MT is similar to just hammering the throttle on a DCT: nice burn out, but sub optimal launch. |
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02-14-2012, 10:42 PM | #10 |
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LOL... I knew someone else would be all over that...
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02-14-2012, 11:27 PM | #12 | |
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02-15-2012, 07:56 AM | #13 | ||
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I don't have time to look it up, but, I believe that there is some details about how LC works in either the original M-DCT press material or the M3 aftersales material provided to technicians. My recollection is that there is a lot going on with the ECU in order to provide maximum acceleration. Of course, as we know, it doesn't always necessarily work out as you might hope. |
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02-15-2012, 11:04 AM | #14 |
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Interesting. It makes sense for the system to work as you describe, though that must mean there must be a significant amount of clutch slip to prevent wheelspin.
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02-15-2012, 11:23 AM | #15 | |
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Nevertheless, in the end, this still means that there is a difference between LC and just doing a clutch drop with a 6MT car. Specifically, the car's electronics intervene and either try to make the launch more effective or less harsh on the equipment, or both. |
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02-15-2012, 08:08 PM | #16 | |
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02-18-2012, 12:24 AM | #17 | |
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02-18-2012, 06:16 AM | #18 | ||
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Anyway, I don't think any good driver can ALWAYS shift right at 8400RPM when DCT would do it. I always drive my DCT on the manual sitting (S) and I HATE the automatic one (D) but of I think I need to go thru 1-4 redlining, you can't beat D for that.
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02-18-2012, 12:33 PM | #19 | |
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Clutch dumps are for AWD vehicles that you are beating on...gotta use more finesse with the M3. |
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02-18-2012, 02:02 PM | #20 | |||
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02-18-2012, 09:44 PM | #21 | |
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02-19-2012, 03:24 AM | #22 |
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Launch control is just a stupid feature that has little point other than to accelerate the wear on your drive train. Had 4 M3s and never used it once.
I'd be surprised if you couldn't get similar acceleration from standstill in a DCT car by pressing smartly on the gas and modulating any wheelspin with the throttle (old school). |
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