Re: Went drag racing - major break down
Idiot proofing your car by over building just slows you down. In the end you will still have a clutch that hits too hard to achieve an efficient launch. All it really takes to bring your car around without breaking it is just adding a little clutch slip time to soften the hit of that RXT.
I have my new version of a clutch hit controller installed in-line between my clutch master and hyd T-brg. It produces a stepped release curve that can also be set up to be active on launch only. It uses a timer to control the duration of the step, and an adjustable valve I call the "HitMaster" valve that separately controls the intensity of the hit. It basically converts a standard hydraulic clutch system to 2 stage, with a softer 1st stage hit that's on a timer, then the 2nd stage of full clutch clamp pressure comes in after the transition timer times out.
A few weeks ago I was experimenting with a Ram dual friction organic/metallic disc, combined with a 2800lb diaphragm PP. 2.78 1st gear, 3.73 rear gear, 28" M/T 275 radials @ 28psi. 1st stage timer was set to 1.0sec. Fired the car up, drove a few miles from the shop to warm the oil up a bit, then stopped on the chip sealed surface to make a hit. Just a random county road with zero rubber down, dead cold 275 radials, no burnout at all. 4500 clutch dump produced a dead hook launch that peaked at 0.98 G's @ 1.02sec. When the 2nd stage of the clutch kicked in at 1.0sec, it knocked the tires loose and accel G's dropped to .72.
Later I did basically the same routine except raised the 1st stage timer setting to 1.5sec for the purpose of extending slip time during launch. This time a 4900 clutch dump produced a dead hook launch that peaked at 1.22 G's @ 1.8sec, well after the clutch's 2nd stage transition.
Remember, this is dead hooked radials on a zero prep random chip sealed county road with no burnout at all. The dual friction disc doesn't mind the 1.5sec slip time that it takes to bring it all together even on a zero prep surface. Adding 0.5 sec of clutch slip time improved peak accel by .24G's, it also got to the same dead hooked driveshaft speed of 2200rpm .625sec quicker. No other changes at all between the two launches, all I did was add .5sec to the clutch transition timer.
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