launch technique

[spina74]

Ok, I've been to the track a few times with my trans am, and each time my times have been decrease from 14's at 98mph to 13.8 at 103, and now 13.5 at 106 almost 107. My 60ft times are around 2.2 to 2.3, and a .057 r/t What do you guys suggest for my launch I bog almost everytime. The video below is how badly i bog, and the 2nd video is me really laying into my launch.
http://www.youtube.com/watch?v=R9lC9nEfIE0

http://www.youtube.com/watch?v=P1G9XEJzmZg

[LTb1ow]

This is a 383? :shock:

What kind of RPM are you launching at?

M6 or A4?

[Blackbirdws6]

If you are bogging, then launch at a higher rpm. Are you running DRs? If not, I would suggest in a set.

[spina74]

No it's a 350 m6...both runs I was on m/t et radials I launched around 2000 during the bog and 3000 when I spun

[Tru2Chevy]

What size DRs and what psi are you running them at?

Pretty surprising that they spun like that at a 3000rpm launch.

- Justin

[BarneyMobile]

Stop dumping the clutch with drag radials. You're gonna have to slip it to get it to hook and not bog. If you'd rather dump the clutch, I'd say ditch the drag radials and get a set of bias-ply tires such as the M/T ET Streets or the Hoosier Quick Time Pro. Traditional drag radials have no give in the side wall to take the shock of dumping the clutch which will either make you bog or spin. Bias-ply or wrinkle walls have a soft flexible side wall that eats up some of that shock from clutch engagement which reduces alot of the bogging. Hope this helps ya.

[spina74]

What size DRs and what psi are you running them at?

Pretty surprising that they spun like that at a 3000rpm launch.

- Justin

255/50/16 and around 30 psi

[spina74]

Stop dumping the clutch with drag radials. You're gonna have to slip it to get it to hook and not bog. If you'd rather dump the clutch, I'd say ditch the drag radials and get a set of bias-ply tires such as the M/T ET Streets or the Hoosier Quick Time Pro. Traditional drag radials have no give in the side wall to take the shock of dumping the clutch which will either make you bog or spin. Bias-ply or wrinkle walls have a soft flexible side wall that eats up some of that shock from clutch engagement which reduces alot of the bogging. Hope this helps ya.

So basically come off the clutch slower until im moving?

[79CamaroDiva]

Stop dumping the clutch with drag radials. You're gonna have to slip it to get it to hook and not bog. If you'd rather dump the clutch, I'd say ditch the drag radials and get a set of bias-ply tires such as the M/T ET Streets or the Hoosier Quick Time Pro. Traditional drag radials have no give in the side wall to take the shock of dumping the clutch which will either make you bog or spin. Bias-ply or wrinkle walls have a soft flexible side wall that eats up some of that shock from clutch engagement which reduces alot of the bogging. Hope this helps ya.

this.

I wish I had a video of me launching my 2002.. You really have to drag the clutch to get a decent 60' time on street tires.. My best 60' is a 1.84, on a 12.71 pass with just an air lid, flowmaster muffler and slight tune on BFG KDWs.. If you keep dumping the clutch you are going to either a) spin or b) break something because the rear and driveshaft are your weak points and if you do hook they take too much of a hit. Get to know how your car feels when its about to slip, drag the clutch so its hooking the whole time with minimal spin. No, your clutch probably won't last long, but you'll have better ETs and won't destroy your rear :)

[NastyEllEssWon]

255/50/16 and around 30 psi





lower that psi down some there boss :nod:

[GrandmasterCow]

this.

I wish I had a video of me launching my 2002.. You really have to drag the clutch to get a decent 60' time on street tires.. My best 60' is a 1.84, on a 12.71 pass with just an air lid, flowmaster muffler and slight tune on BFG KDWs.. If you keep dumping the clutch you are going to either a) spin or b) break something because the rear and driveshaft are your weak points and if you do hook they take too much of a hit. Get to know how your car feels when its about to slip, drag the clutch so its hooking the whole time with minimal spin. No, your clutch probably won't last long, but you'll have better ETs and won't destroy your rear :)

correct. breaking your rear and driveshaft isn't fun :nod:

[spina74]

B4C said go balls to the wall...I think I'm gonna try again real soon before my cam swap, I just need to practice on slipping the clutch now, should I stay around 2000 or 3000?

[LTb1ow]

B4C said go balls to the wall...I think I'm gonna try again real soon before my cam swap, I just need to practice on slipping the clutch now, should I stay around 2000 or 3000?

Yea... cause B4Cs car runs what a monster cammed car should... :rofl:


Yea, you gotta find a good RPM where you get it moving and not blow past the tires.

[sweetbmxrider]

B4C said go balls to the wall...I think I'm gonna try again real soon before my cam swap, I just need to practice on slipping the clutch now, should I stay around 2000 or 3000?

http://www.njfboa.org/forums/showthread.php?t=51215

i mean he could know a thing or two, i sure don't. i mean i think posts 6,9, and 10 are useful :-?

[LTb1ow]

http://www.njfboa.org/forums/showthread.php?t=51215

i mean he could know a thing or two, i sure don't.

Giving a bad name to the rest of the crazy southern drag racers these guys are... :rofl:

[cdubbzz]

set tires at 21psi
hold rpm near 4k and let clutch out quick and smooth...then mash the gas

skip to 1:45 (not my best launch but you'll get the idea)
http://www.youtube.com/watch?v=4wCsgeX1td0

If you blow the tires off then try launching at a lower rpm. Don't be discouraged as it
will take a handful of runs to find the sweet spot

[79CamaroDiva]

B4C said go balls to the wall...I think I'm gonna try again real soon before my cam swap, I just need to practice on slipping the clutch now, should I stay around 2000 or 3000?

http://www.njfboa.org/forums/showthread.php?t=51215

i mean he could know a thing or two, i sure don't. i mean i think posts 6,9, and 10 are useful :-?

:lol: I wouldn't take the advice of anyone running a 12.6 with a 60' that still begins with a 2

set tires at 21psi
hold rpm near 4k and let clutch out quick and smooth...then mash the gas


If you blow the tires off then try launching at a lower rpm. Don't be discouraged as it
will take a handful of runs to find the sweet spot

:stupid:

I generally launch between 4-5k, depending on track condition.. drag the clutch enough to find the balance between keeping your RPMs up and your tires planted.. It will take quite a few passes, and might not even be possible on street tires during the summer months.. High track temp during the day, and high humidity at night don't make for good traction. Try it on a cooler, partly cloudy day when track temp is optimal

[spina74]

Lets not pick on B4C now, Ida tried what he said, but I fear my strong 10 bolt might bite back

[deadtrend1]

.... Ida tried what he said, but I fear my strong 10 bolt might bite back

sometimes you have to roll with the punches .... or cross that bridge when you get there.

If it breaks, you can fix it. You can make it faster, stronger, better. :nod:

[98tadriver]

i wish i had video of my 11.94 @115pass with my bolt on z28. around 4500rpm i slipped the clutch quickly on 17" nitto drag radials. i spun the wheels but still cut a 1.77 60' and it was my last run and fastest of the day

[B4C]

Lets not pick on B4C now, Ida tried what he said, but I fear my strong 10 bolt might bite back

Haha I dont even remember what I said to you lol I prolly said goe balls to the wall like rob and launch off the limiter, but I was just joking lol

[spina74]

I went back and slipped the clutch this time and went 13.1 at 107 with a 2.1 60'. Would have tried more, but I got thrown off the track due to a leaky oil cooler(no i didn't know till then)

[98tadriver]

with more seat time youll get better. fix the leak and get back out there! lol