Radial tire question

weedburner · 03-25-2019, 11:07 AM

Clutch hit control is what you need to make radials work with a stick.

I don't share competitive graphs, but this one had a few problems so I can show it here. It shows what a dead hook launch looks like using one of my clutch hit controllers. 302ci sealed crate engine running the spec tune, 3100lbs. Class doesn't allow radials, so this run is with a 10.5" bias slick @ 18psi...

First problem was not enough delay after the hit, which caused rpm to get pulled down to about 5200 after launch. 5500 is typical.
Second problem was the PP needed to be shimmed a little more in order to control those wheelspeed spikes after the shifts.

Depending on the track/conditions, it's not unusual for the above car to be able to go above 20psi with bias slicks and still dead hook without pulling rpm below 5500.

03-25-2019, 11:07 AM	#1
weedburner Junior Member Join Date: Apr 2016 Posts: 55 Likes: 1 Liked 20 Times in 16 Posts	Re: Radial tire question Clutch hit control is what you need to make radials work with a stick. I don't share competitive graphs, but this one had a few problems so I can show it here. It shows what a dead hook launch looks like using one of my clutch hit controllers. 302ci sealed crate engine running the spec tune, 3100lbs. Class doesn't allow radials, so this run is with a 10.5" bias slick @ 18psi... First problem was not enough delay after the hit, which caused rpm to get pulled down to about 5200 after launch. 5500 is typical. Second problem was the PP needed to be shimmed a little more in order to control those wheelspeed spikes after the shifts. Depending on the track/conditions, it's not unusual for the above car to be able to go above 20psi with bias slicks and still dead hook without pulling rpm below 5500. __________________ Grant website- http://ClutchTamer.com We make your non-adjustable clutch...ADJUSTABLE! Last edited by weedburner; 03-25-2019 at 11:10 AM.