60ft Help Needed
60ft Help Needed Went out last night and could not cut a 60 to save my life. Car is a 2006 Procharged GTO, M6, AFCO DA shocks, on 26X11 Hoosier bias plys no tubes (6 runs on the tires). I do a 1st gear burnout for about 10 seconds on the first burnout for the night then shorter ones thereafter. The major differences from a month ago are different track (Atlanta Dragway> Silver Dollar), 20 degrees cooler, and I took about 80lbs out of the car (none of the weight removal was behind the seats).
A month ago it would consistently go 1.61x in the 60 foot. Last night I let the clutch out at 5k and got MASSIVE wheelhop to the point where interior panels came loose (tires 15 psi cold). So then I tried 13 psi cold and a 4k launch and it bogged hard then was super unstable on the big end. After shitting myself, because of the rear end wobbling around, I went to 18 psi cold and tried launches from 3500-5000 and they were mostly bogging except for one where I had a strange burnout and it blew the tires off. Also, the tires are feathered to **** with a really rough texture on them now. Not sure if that is because of a rough shutdown area or something up track. Should I keep adding air until the tires slip to get wheel speed up? Something else? Let me know what you think, TIA.
A month ago it would consistently go 1.61x in the 60 foot. Last night I let the clutch out at 5k and got MASSIVE wheelhop to the point where interior panels came loose (tires 15 psi cold). So then I tried 13 psi cold and a 4k launch and it bogged hard then was super unstable on the big end. After shitting myself, because of the rear end wobbling around, I went to 18 psi cold and tried launches from 3500-5000 and they were mostly bogging except for one where I had a strange burnout and it blew the tires off. Also, the tires are feathered to **** with a really rough texture on them now. Not sure if that is because of a rough shutdown area or something up track. Should I keep adding air until the tires slip to get wheel speed up? Something else? Let me know what you think, TIA.
I agree the feathering is bad news. No launches at all besides the track so they got feathered there for sure. I think next time out I will air up (20 psi cold) and launch harder. It seems like I am not getting the tire slip I need to get out of the hole. The wheelhop was real strange though because its never happened before with bias plies.
TECH Fanatic
Joined: Oct 2005
Posts: 1,131
Likes: 76
From: olympia, wash
20 psi seems way high to me.
Swap the tires, side to side first.
Start with maybe 15lbs, and launch at the rpm you usually do.
Repeat same thing for your next run.
Then either add a a cpl lb's of air or take a cpl away.
Launch the at the same rpms as the first run's.
Check your 60' on your time slip and go from there.
It is uber important to do the same launch procedure every run.
It wont help to adjust your psi, and change your launch rpm at the same time
Swap the tires, side to side first.
Start with maybe 15lbs, and launch at the rpm you usually do.
Repeat same thing for your next run.
Then either add a a cpl lb's of air or take a cpl away.
Launch the at the same rpms as the first run's.
Check your 60' on your time slip and go from there.
It is uber important to do the same launch procedure every run.
It wont help to adjust your psi, and change your launch rpm at the same time
So I am bumping this up as I have determined that "radial prep" is what is killing me. The track sprays glue down to a mirror shine and I can't get the slicks to predictably slip to get some wheel speed. Any tips for using a slick on radial prepped track? TIA
TECH Apprentice
Joined: Oct 2015
Posts: 353
Likes: 21
See post #5.
The Hitmaster makes dead hook stick shift launches without bogging the engine a reality, slicks or radials. No wheelspeed required.
Here's a link to the Hitmaster install & tuning guide... Hitmaster install guide
Here's a link to my page about advanced clutch tuning... Advanced clutch tuning page
Grant
The Hitmaster makes dead hook stick shift launches without bogging the engine a reality, slicks or radials. No wheelspeed required.
Here's a link to the Hitmaster install & tuning guide... Hitmaster install guide
Here's a link to my page about advanced clutch tuning... Advanced clutch tuning page
Grant
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See post #5.
The Hitmaster makes dead hook stick shift launches without bogging the engine a reality, slicks or radials. No wheelspeed required.
Here's a link to the Hitmaster install & tuning guide... Hitmaster install guide
Here's a link to my page about advanced clutch tuning... Advanced clutch tuning page
Grant
The Hitmaster makes dead hook stick shift launches without bogging the engine a reality, slicks or radials. No wheelspeed required.
Here's a link to the Hitmaster install & tuning guide... Hitmaster install guide
Here's a link to my page about advanced clutch tuning... Advanced clutch tuning page
Grant
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TECH Apprentice
Joined: Oct 2015
Posts: 353
Likes: 21
The guys that are cutting good 60's likely don't have the same clutch as you do. The clutch and how it interacts with the engine is the key part of the puzzle that brings the engine/chassis together as an efficient package.
Grant
Grant