Launching a SAE car, 600rr engine - Sportbike Forum: Sportbike Motorcycle Forums
 
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post #1 of 3 (permalink) Old 02-24-2009, 09:17 PM Thread Starter
 
Join Date: Aug 2007
Posts: 56
Launching a SAE car, 600rr engine

I am a member of a Formula SAE team, it basically is a formula series for college engineers. We build and design a car every year from the ground up, based on a CBR 600RR engine. At competition there is a acceleration bit, which is where my question comes in....

In launching I have two big tires, from what i have read on this forum and car forums is it seems i should be launching from around the 10,000 RPM range, and letting the clutch out at just the right rate to minimize wheel spin and maximize acceleration. Is there any difference I should know about with a wet clutch compared to the dry one in a car when launching?

Also since this is a motorcycle forum i figured everyone would know about shifting these engines under load without clutch. How far do you have to chop the throttle on average to get the tranny to shift up? our current car has a F4i in it and the transmission is pretty much shot from clutchless up-shifts and down-shifts, so it is useless as a gauge. Also, apparently the 600rr has a better tranny in it?

can anyone correct or confirm my facts, or give me any more tips? every little bit helps in the acceleration run since it is so short, i believe 60 yards.

Thanks for all your input, and sorry about the long post
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post #2 of 3 (permalink) Old 02-25-2009, 06:35 AM
 
Join Date: Mar 2004
Posts: 8,798
1. There is no noticeable difference between a wet clutch and a dry clutch, except that a wet clutch is much quieter
2. chopping the throttle 10%-25% is ussually enough to unload the tranny and shift into the next gear, but only if your throttle is open wide (or close to) to begin with.

Hope that helps



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post #3 of 3 (permalink) Old 02-25-2009, 08:40 AM Thread Starter
 
Join Date: Aug 2007
Posts: 56
ah i see thank you very much, there will be no trouble having the throttle wide open
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