Help with Launchin the g at the race track?

[g35cuhlean]

Okay, I tried launchin my car, but some how all it does is a whole lot of burn out. I turned off the traction buttom still tire spinning like crazy. I am scare that i might break something if i keep on trying.

So help out this newbie how to launch his car.

Its a six speed coupe with a bone stock engine.

I tried 2 rpm dead stopi treid 3 rpm deap stop

Tires burning like crazy, feels like im doing a burn out.

help help help.

[RED_DET]

You have to ease out(slip)the clutch and feather the gas if you detect any wheel spin. Some where between 2-3k rpms is ideal, but you can't just release the clutch and stomp the gas.

[zozoka1212]

This might help you.

http://youtube.com/watch?v=W7bb2OKFKgc

he is not a best talker but you can see. Picture says a 1000 word.

zozo

[risingson]

whats the best way to launch an auto?

[gwoods]

I have been drag racing at the track for about 4 years. I take my G to the track at least once a month... its an automatic.

Run your front tires up to 40 psi, let your rear tires down to 22-26 lbs of air depending on track temp, turn off VDC and put the transmission in DS mode.

If you really want to get crazy, remove everything from the trunk, and passenger compartment (floor mats, trash ect). Remove the back seat, remove about 1 quart of oil from the engine and drain your radiators overflow tank. Remove the plastic liner from under the motor. Remove your air filter at the track...... all the above is only if your really crazy.

Heres how I launch and get the best time.

1> avoid the water box! Street tires are slippery when wet and you will not be able to burn all the water off spinning them. Water will collect in the sipes and you will take it down the track with you creating an unsafe condition for EVERYONE. I am always pissed at the NOB using the water box with street tires.... his lane will be slippery for about 3 runs after his.

2> after the starter gives the signal to burn out do a light brake stall and spin the tires up to the line.

3> Launch from idle, one foot on the gas one foot on the brake (stick, one on the gas one on the clutch)

4> When the 2nd yellow light dims floor it you will cut a .2-.3 rt, you need full throttle to get weight transfer and pop the front end up

5> your going to brake traction, let up slightly from full throttle until you have traction then floor it again

I'm running pretty consistant 14.0's at 100 mph launching this way. I'm going to buy drag radials SOON and then I will be able to leave at a higher RPM and break into the 13's.

Here is a video of my last trip to the track, if you turn your volume up you can hear me break traction on lauch and then I let up very slightly and floor it again. The same night I left at 2,000 RPM and did not let up the car ran a 14.7 LOL So you need a little bit of wheel spin but not too much.



To answer your question about wheel spin breaking something...

If your just spinning it probably will NOT break anything. If you have wheel hop that can break suspension parts and differential parts! So avoid wheel hop.... if you get it let up as soon as you can. Take some video and post some slips.... I would love to see another Infiniti at the track!

Your more likely to break something if you do not have any spinning. The rear axle is IRS so it has cute little half shafts that can probably be broken with a set of slicks and a good launch.

Heres what is looks like when you break a half shaft... this is my off my buddies SRT-8 charger thats bored and stroked to 426" and running a 75hp shot of NOS as needed



Jeff

[Sentientbydesign]

Check out your tire marks. If you're leaving only one, it might just be the open diff.

I know I opted for an 05 6MT simply because it assured me of VLSD.

If you really wanted to, you could probably get a different clutch and pressure plate to grab quicker, but I can see that just causing problems. Especially during daily driving.

[g35cuhlean]

Thanks for all the tips guys. I will give it a try again when its not rainning like crazy in north cal.

[zozoka1212]

Let us know how it goes.

zozo

[risingson]

turning off the vdc is just to make sure it doesnt try to work? in other words.. it wont necissarily make you launch faster?and those tire pressures are only for the track and not daily driving, right?whats the optimum rpm shift points for the manumatic?

[gwoods]

I just let it shift... the odds of me missing a shift negates any chance of me shifting faster then the car can shift.

Those tire pressures are for the track. I air up my fronts to 40 psi COLD before I head to the track. When I get there I let the rears down to 26psi and try to launch. Letting out air 2 lb at a time between runs. I don't go below 22 psi because I worry about a tire splitting off the rim if I go any lower then that.

I run .4 slower with VDC on,