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Old 08-14-2008, 07:02 PM
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Drag launch stick shift

I'm used to being able to rev up the engine and pop the hydraulic clutch in a modern fuel injected car.. It doesn't seem to translate well to my carbureted camaro. It used to be an auto with a 3000 stall and launched pretty well. When I let the clutch out now it just wants to die. Drives and accelerates fine while driving normal just not on a hard launch.

Any tips/ pointers for the driver, tuning ideas for the carb? Would it have anything to do with the accelerator pump not being used since the pedal's already been pressed a couple seconds before the clutch is let out?

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Old 08-15-2008, 03:44 PM
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I think we need some more info. Is this a drag car or a street car. You may need to get the revs up more than 3 grand to get a good launch. Also, check the float levels in the carb. You may possibly have to install surge tubes in the carb to keep from flooding. What rear end gear are you running, and tire sizes?

An automatic won't couple up as tight as a stick on launch, so you got a little cushion. If you're running a high ratio rearend (like the low/mid 3's) and big tires, you're going to have to crank that puppy up to launch without bog.
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Old 08-15-2008, 05:40 PM
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Its a street car.. pretty mild. 350/T-10/3.23/25X9 Tires. I have 2 sets of tires and it spins one set of tires no problem but always has trouble spinning these. This may sound weird but would it be better to run the not so grippy tires at the track just to help it launch a little better?

"Launching a car hard from a dead stop is accomplished by slipping the clutch and spinning the tires, both within reason" - Drive Arabia - Launch Techniques - Manual Transmission
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Old 08-15-2008, 06:26 PM
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I think if you're at all serious about running at the track, you need more gear...maybe a 3.70. Is this your only driver?? If it is, I wouldn't go more gear to keep gas mileage in the ballpark. More gear, the big tires. You didn't say if they were slicks or street tires. If they're slicks, try driving around the bleach box and run them cold. They'll break loose a little easier.

And I would disregard the book article part about slipping the clutch....unless you like replacing clutches fairly often. The lower rear gear will help the drivetrain (U-joints, axles, etc.) because it won't be such a strain getting the car moving.
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Old 08-16-2008, 09:08 AM
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It seems like you have to wide of a slick.
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Old 08-16-2008, 03:12 PM
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The car could benefit from more gear and more flywheel. Some of those little junior stocker Chevys used to run 50 lb 'wheels.
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Old 08-17-2008, 05:51 AM
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Boy Tech that brings back old memories.....way back, a buddy used to run a '57 2 door with a 301 4 spd. He had a 50 lb. Hays flywheel and "Bruce" slicks. Once he got the R's up and got that big wheel turnin he had no problem launchin it....
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