I'm wondering...what rpm do you keep it at before you dump the clutch or brake pedal? I want to know the ideal RPM to drop it so I can gain the most traction whenever driving pretty hard from a stop. I did it at like 4k rpm and it spun the tires too much...

 

It would vary with the tire width, diameter, temperature, and compound as well as road surface type and temperature.

All that being said, you don't want to "dump" the clutch as that will almost certainly produce a smokey destruction of your tires. A light slip of the clutch to start moving the car and release will produce the best launch.

 

i drop mine on around 2500 rmp

 

Rev to 3-3.5K and feathering the clutch out of the hole works best for me (less wheel spin). Only once have I smelled the acrid smell of burnt clutch.

 

if you dump the clutch at 4k routinely your clutch will not last much more than 20k. I know that on mine I'll gradually let the clutch out in a smooth motion at around 2000-2500 and once it's engaged you can really get on it. I find that it gives good traction, is easy on the clutch etc.

4k launches are pretty useless.

 

Well, I have an automatic and I was just wondering what RPM was ideal for me to power brake and launch...

 

Ah, I'll give it a try in a few weeks. I'm hoping to get to the track for a test and tune. Usually get ~10 runs so I'll try to get a good number for you.

 

u never dump the clutch no matter what the RPMs are. Dumping the clutch at any RPM will cause wheel spin or bog.

 

wrong. Im on stock clutch at 62k and had over 100 1/4 passes alone. My launches were never below 2500 rpm. My last trip i was launching at 4500-5000 rpm with slipping the clutch a bit and never had issue with smell or excessive clutch wear.

 

so..., how can you tell you clutch does not have excessive wear?? have u dropped it out of the car and looked at the plates?

not attacking you, just curious.

 

The reason i came to that conclusion is because most of the drag racers on this forum are lucky if they get to 50k on their stock clutch. We have members here that change the clutch out at 30k. I was expecting for my clutch to take a **** long time ago yet it still has 0 slippage having 62k on it. I understand that any type of clutch abuse will shorten its life, but if i have 62k with all that abuse, i am sure that the stock clutch in normal driving conditions should be good for at least 200k miles.

 

hmm, thats good to hear then cuz i have a 6mt.
i usually launch at 2-2.5k.

whats ur 60' time?

 

I've tried different rpms (and of course it depends on the road conditions, etc.). Just around 2k seems to work fine without too much spinning.

But, my car seems to get out of the hole quicker without powerbraking. Just punch it right to about half throttle, then ease on it to full quickly from there.

I haven't tried this at the drag strip yet though.

You just want to accelerate as fast as you can without spinning the tires.

 

Car and Driver listed 3,500 k for the best launch in the G35 test back in 2007

But then again what do they know?

 

there is no set RPM for a car. There are too many factors when it comes to launching the car.

1. Tires
2. camber
3. road conditions
4. Tire temperature
5. clutch control
6. throttle control

I can go on and on........
As u get more experience with hard launching all those things become second nature if u need to launch the car. I can get consistant 2.1 60ft times right now in any condition besides rain and snow on the street or at the strip. When u do lots of hard launching u get used to what the car likes at that split second and u adjust accordingly.