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Dragstrip and Launch Techniques Discussion 1/4 mile, 1/8 mile, launch discussions.

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Old 04-04-2014, 11:05 AM   #1
ytown87
 
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What final gear are you in? 1/4...M6 SS

Last night I got 4 runs in. 1st run went through and shifted at 6000 to 4th. 2nd run I got the notorious clutch sticking to the floor at launch and had to nurse it down the lane. 3rd run I said heck with it ima leave it in 3rd but hit the limiter maybe 50-75 ft from the 1/4 and dropped off. 4th run I shifted to 4th around 6200 and right as I left off the clutch there was maybe that 50 ft left.

Is this normal? It feels like I'm losing speed in that last few feet for no reason. I hang every gear to right at the limiter. Since I'm fairly new to drag racing I wanted to make sure I'm doing things right and not scrubbing off lower times. Personal best so far 12.763 1/4 and 2.015 60' on stock pirelli which are almost done for. Will be switching to 305 nitto 555r real soon.

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430whp 430tq
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Old 04-04-2014, 11:28 AM   #2
Juice2SS
 
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You need more gear. I could run some calculations but a 3.73-3.91 would probably have you at redline in fourth at the stripe. Not sure which one though. I know the 1LE guys are going through at the top of fourth if that tells you anything.
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Old 04-04-2014, 04:01 PM   #3
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If your car is tuned you need them to raise the limiter! When I have my m6 I always hung out 3rd till the end. If your shifting 4 your loosing speed, have them raise it to 7k. I use to cross the traps around 6800 if I remember right. This is your only option, and your motor will be fine.
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Old 04-04-2014, 04:28 PM   #4
ytown87
 
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Quote:
Originally Posted by Juice2SS View Post
You need more gear. I could run some calculations but a 3.73-3.91 would probably have you at redline in fourth at the stripe. Not sure which one though. I know the 1LE guys are going through at the top of fourth if that tells you anything.
I was thinking going this route as well but not sure how much it is to put in 3.91 gears. Any idea?

Think I may also have the limiter increased for now as a temp solution. The power band on the dyno started to drop off around 6100 bit it'd be worth it not to shift again and scrub speed.

Talked to a few guys and I think I may do so drag shocks in the back and remove the front sway bar to hook better.
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Old 04-05-2014, 03:03 AM   #5
2010SSRSM6
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What final gear are you in? 1/4...M6 SS

Finding 3.91's is going to be harder than finding a shop to install them. I've seen anywhere from $500-850 to install gears, plus the cost of the gears and the install kit.

If you are thinking gears, you might as well install a TruTrac and axles while they are in there.


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Old 04-05-2014, 10:00 AM   #6
Irnwkrkev
 
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4.30's would put a bolt-on 6m closer to redline @ the stripe. Liberty Gear is very reasonable to set up gears @ $350 + shipping.
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Old 04-09-2014, 11:07 PM   #7
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I'm running 3.89s in mine and the rev limiter is set at 7100 and I have to use 4th. Before the gear change with the rev limiter the same it hit right at the finish line in 3rd. I tried short shifting and using 4th with no ET gain.
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Old 04-12-2014, 01:11 PM   #8
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I hit the traps on the limiter in 3rd. Literally as soon as I hit the line the limiter kicks in. I've tried hitting 4th but like you I felt I was losing speed. I am racing at Bristol TN which is up hill and crazy elevation but I managed a PB of 13.34 @ 110.9 on LT headers, cat delete and the NPP exhaust open. No tune on stock Pirelli tires.
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Old 04-13-2014, 09:43 AM   #9
Rabamaro
 
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At 430 whp, you won't come near the limiter with 3.91s. 4th gear tops out at 140 mph with the 3.91s. Also putting in $1200 axles seems overkill. I got my 3.91s from Maureen at Rogers Chevy for $254 shipped and had my dealer install the gears and posi mod for $600. I drove in and drove out 2 days later. They're even warrantying it since it's a GM part and they did the install. I broke a stock axle 3 weeks ago, and they didn't blink twice to warranty it. I'm at 498 rwhp currently.
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