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0-60 times. How to get the quickest launch without breaking stuff...
A friend insists it is safe to bring the motor to 4,500 rpm and just release the clutch all at once. Yikes!
 He says if you ease out the clutch at high RPM it will burn the clutch more than just a clutch-dump start. Can anyone with experience walk me through the steps for a super-quick launch?
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11-08-2003, 03:45 PM
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Too big to fail
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I launch between 2500 and 3000. Bring the RPMS's up to [2500-2000], gently let the clutch out until the car starts to move, then simulataneusly let out the rest of the clutch and floor the gas. Be ready to grab for 2nd, because you'll need it very shortly.
My best 0-60 time was 4.3, with everything out of the car, and about 1/64th a tank of race gas spiked with 1 gallon of toluene. Unfortunately I didn't have the camera with me that time. I have a special spot that I use for these tests, where the launch pad had an ever-so-slight slope (sshhh, don't tell anyone) which helps get the car started. Here's the best 0-60 which I can prove with a pic: 
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11-08-2003, 04:09 PM
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Moses, it hard as heck not to break the tires loose in my car, Kevin
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11-08-2003, 04:14 PM
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Moses--I pondered the same thing when I got my 3.6 installed. I went to a local track (dragstrip) this past spring and ran around 8 runs on a 1/8 mile track experimenting with various clutch dump starts. There seemed to be a little too much wheelspin if I dumped it over 4500rpm--it was not a gradual clutch release either--it was a quick release DUMP. When the 2nd yellow light blipped on the tree I was holding the rpms at a specific rpm and then releasing the clutch immediately. These 3.6 engines sitting over the rear wheels have alot of grip especially with 17" 255's running in the rear along with the short 1st gear. It seemed the higher rpm clutch dumps just ran up the wheelspin to 1st gear redline quicker with no payoff in quickness. The quickest time of the day was 3500 rpm clutch drop with minimal wheelspin--the hangup for me was 1st to 2nd gear change (at around 40 mph) which I can do fairly quickly but there still is a little hitch here that slows me down--even though my tranny seems to be in good shape and shifts quite smooth with the factory short shift kit. My best time was 8.8 secs at 82mph in the 1/8 mile. I didn't want to push my luck that day and haven't been doing many clutch dumps since. I'm afraid this type of info is expensive to learn and tests the limits of these 915 transmissions. Sure is fun though...
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11-08-2003, 04:28 PM
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Quote:
Thom, use this pic when you post on the 930 boards.  
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Last edited by Moses; 11-08-2003 at 06:26 PM.. |
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11-08-2003, 06:11 PM
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my $0.02: whatever you do dont let the clutch out slowly. let the tires take the up the slack..they're much less expensive to replace.
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11-08-2003, 06:55 PM
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A lot of it depends on the clutch.
A stock clutch might be weak enough to accept a quick dump but people with performance clutches should be a little more careful with their engagement methods. Something in the system must be willing to give when you are talking about 4,500 RPM clutch dump but if the rear rubber is wide and the clutch overly strong something else is likely to give. There is a world of difference between a fast clutch engagement and popping the clutch. |
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11-08-2003, 07:05 PM
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