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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Wed, Jun-13-2018, 11:10:42 PM   #1
BMW>Everything
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Default Launching Over 4k RPM?

So I have some very sticky tires, (275/40/17) Hoosier Slicks!

My tune has launch control set at 4k RPM and I can literally dump the clutch and my car will not slip or spin at all on the STREET!

I'll be going to the drag strip with a prepped track and even more grip so I want the best possible 1/4 time.

So my question is should I just keep increasing my launch RPM until my tires start losing traction?

I make around 315WHP, and I had Stage 3 clutch installed 5k miles ago, and reinforced subframe, 4.10 diff, all new suspension and drive-line bushings replaced 15k miles ago.

The only thing that isn't replaced is my driveshaft and transmission. Both have 140k miles.

So whats the max I could do without hurting anything too badly??

Last edited by BMW>Everything; Wed, Jun-13-2018 at 11:42:19 PM.
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Old Wed, Jun-13-2018, 11:14:35 PM   #2
Paulo M
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Default Re: Launching Over 4k RPM?

I don’t have anything to add but I’m very interested in what you run, please let us know how you do. Would’ve been perfect if it was on street tires since that’s what I’ll be on when I run mine.

If you’re a good driver I can see you running mid 12’s consistently.
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Old Wed, Jun-13-2018, 11:41:13 PM   #3
M3_Pilot
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Default Re: Launching Over 4k RPM?

I think you’re better off slipping the clutch as opposed to just dumping the clutch and increasing your launch rpm.
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Old Thu, Jun-14-2018, 12:12:46 AM   #4
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Default Re: Launching Over 4k RPM?

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Originally Posted by M3_Pilot View Post
I think youíre better off slipping the clutch as opposed to just dumping the clutch and increasing your launch rpm.
Why do you say that? If my clutch can deliver that power instantly when I dump it, isn't that faster acceleration then slipping it?
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Old Thu, Jun-14-2018, 12:35:05 AM   #5
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Default Re: Launching Over 4k RPM?

Quote:
Originally Posted by BMW>Everything View Post
Why do you say that? If my clutch can deliver that power instantly when I dump it, isn't that faster acceleration then slipping it?
I think youíre bound to break a drivetrain component by launching the car from letís say 5000 rpm with sticky tires on a sticky dragway. Iím sure the axles would be the first thing to give with that level of impulse.
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Old Thu, Jun-14-2018, 04:45:03 AM   #6
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Default Re: Launching Over 4k RPM?

I do Pro Solo, which is basically autocross with a drag start.

I am running the stock clutch, flywheel, and diff with 295 Hoosier A7s.

I have to rev to 3000 RPM, slip the clutch and feed throttle to avoid too much wheel spin.

The best 60' times I have seen a 1.8s, but usually it's 2.0s.
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Old Thu, Jun-14-2018, 04:50:40 AM   #7
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Default Re: Launching Over 4k RPM?

I think if your car is putting down the power without too much wheel spin then more revs will be OK.

One technique I have seen some guys do:

1.) set up the car in the staging lights
2.) engage e-brake
3.) load the drivetrain e-brake engaged
4.) rev and drop the clutch/e-brake same time

this spares the drivetrain more force due to the slack you are removing.
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Old Thu, Jun-14-2018, 08:25:40 AM   #8
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Default Re: Launching Over 4k RPM?

Normally you test how high on rpm you can go before there is wheel spin, yes, if you start getting some wheel spin, you can back off rpm or start slipping/engaging the clutch slower. However, you mention that you dont want to hurt the drivetrain, I feel like that is a bit of an oxymoron - you have a race clutch and slicks which will hook up and deliver the requested power, so some other weak link might give (maybe your driveshaft ujoint, maybe your guibo, maybe you halfshaft cv joints, etc).

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Old Thu, Jun-14-2018, 08:33:57 AM   #9
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Default Re: Launching Over 4k RPM?

axle's will be the next weakest link.. the driveshaft on these cars are pretty beefy from stock and can handle more than your 315 can deliver.
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Old Thu, Jun-14-2018, 09:57:40 AM   #10
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Default Re: Launching Over 4k RPM?

Send it. When it breaks mend it.
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Discussing Launching Over 4k RPM? in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)