Allright I finally got a video of what my car looks like when it launches, and I'm confused. It leaves the line fine, the front end lifts, then it goes down, but then it comes back up again (all in 1st gear) I will post a video later of it when my buddy uploads it.... but here's what I'm doing/my setup.

Front sway bar removed
Spohn Drag rear sway bar
Spohn adj poly/poly lca's.
UMI lca relocation brackets (set to the lowest setting
UMI tunnel braced torque arm (-4* pinion angle)
UMI adj panhard bar
15x10 draglites with m/t 26/10.5/15 and skinnies on the front
9" with detroit locker with 3.70 gears

the bad:
I dont have bump stops.... I heard this can hurt your 60' times if you car squats enough
I have bilstein hd shocks (i need to replace them w/ some qa1's...)
stock springs

I have my two step rev limiter set on 4000. Launching wise, I pre stage, stop, let up on the clutch until the car stages and then press it down just a little bit so it's barely not engaged. I then hit the two step, floor it, wait for the lights and then let go of the clutch and never lift on the gas pedal until after end of the 1/4 mile.

With all of this, I was only cutting 2.0 60' times. It didn't seem like I was getting any wheel spin or bogging the motor off the line...

Edit: Vids
http://s122.photobucket.com/albums/o...ent=PRP029.flv
http://s122.photobucket.com/albums/o...ent=PRP033.flv

 

bueller?

 

Mark your tires with a white stripe. I'd bet that you're spinning. Or your clutch is slipping.

 

Its falling on its face big time. Something needs to slip, either the clutch or the tire. You could try for more clutch slip by raising the launch rpm. When I had 26x10.5 ET streets I had to launch around 5k, if it hooked it would pull through the clutch and 60ft 1.8x. At around 4k it would hook, hike the nose, drop the nose and pull the motor way down out of the power band and could not recover. The result was 2.0-2.1x 60fts. You will find its a balancing act between launch rpm and tire pressure depending on the track condition.

Oh, the other issue was just blowing the tire off for 10-15 feet if the pressures were off or the track was crap. Sometimes would spin out to the 60 foot clock. Getting a good run in a stick car is tough.

 

yeah I'm pretty sure the clutch isn't slipping. I have a mcloed street twin.

A few locals have told me to raise it to 5K off the line

I just picked up a set of v6 springs for the rear, v6 struts for the front, and lakewood 50/50's for the rear shocks.

lol oh yeah... I forgot to mention, on that run I was retarding my timing 6* for my nitrous, but wasn't spraying. hopefully the next test n tune I'll be in the 12's, which is great for my altitude. I know that run in the video was a 12.9 @ 108 corrected.

 

Street twin is going to make it tough to launch if just popping the clutch. You could try riding the pedal out.

On N2O it may have the power to pull through and not drop the nose.