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iTrader: (1)

Just wondering how you guys launch your cars with a 9" diff..........

I just put mine on and still breaking it in so I havnt had a chance to practice.

I'm going to be running at the track with a set of Mickey Thompsons... and have an LS7 clutch......

What would you recommend?

Dropping the clutch at 6k rpms? Feathering? etc.etc.

thanks

EPP

iTrader: (22)

I would start at 4000 rpm and see how the chassis reacts to it. Bob

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iTrader: (1)

yea that what I was planning.... gona try a few differnt techniques....

Im not too worried about the chasis.... i have sub frame connectors and the other whole 9 yards....


was just curious as to what has worked for others...

blk00ss

iTrader: (66)

You will probably have to slip out of the clutch just a hair. Any time I try to just dump the clutch I always blow them off.

daniel6718

iTrader: (36)

youll prolly end up near 5000-5500 and a quick slip

bad6as

iTrader: (17)

funny you ask
i went on et streets bias plys and tried launching i never spun just a hook and bog. i tried 3.5-4k dumps and some slips at aprx 2.5-3k
i had the tires at 20psi.

when i go again im gonna put them a 25 to start with and launch at my peak tq (just got a dyno tune) and it is 4400 and flat lines till 4800 then falls off from their so maby ill try around 5k

bad6as

iTrader: (17)

i would be nice to cut a good 60 on slicks these 1.9's and i mean high 1.9s are killing me and yes i had some 2.0+ in there to my best was a 1.897 (and that was pre tune ls6 im and tb)

i think a mid 1.7 would be ideal for me

IGNANt

iTrader: (15)

im at 13psi on stock rimmed DOT slicks on a stock 4.10d rear cutting a 1.83 slipping the clutch at 3k, 20+psi is too high, you'll just spin... i just got my moser 9" and whole rear chassis and am planning to use the same stock rimmed DOTs, ill start at a 4k slip and 13psi again, we'll see.

tonylittle

iTrader: (3)

i launch at 5400
started at 3500 though

blk00ss

iTrader: (66)

I think if you can get your suspension dead on, cluth dumps will be no problem. Thats what I am currently working on. All I need is a torque arm, and front suspension, and maybe an anti roll bar.

BriancWS6

iTrader: (18)

Hold the rpm steady at 4-5k, on the 3rd yellow, floor it and side step it

01350ss

iTrader: (18)

1.50 on a 9" spool with 28" et drags. dumped the clutch at 5k. next time out I will be looking for low to mid 1.4's. By the way t was also 33* outside so it was a little cold.

nd4spd22

iTrader: (6)

I also have a 9" and I have been having some serious issues with traction. I tried dumping it at like 1700 and it bogs, so I tried like 2500 and it wheel hops really bad. I have an adjustable torque arm, and it is set at -1.5. Does anybody know what I need to do to fix this problem!? Does it need to be set at a different degree? Do I need the relocation brackets? the best I've run with the 9" is 1.89. ...not to proud lol.

thanks guys!

ERIK@MASPORT

iTrader: (32)

Sounds like your tires are not warm enough..OR, they may have too much air in them...what tires were you running and @ what PSI...

If I was to take a wild guess as to the tires you were running, I would say Nittos...am I right?
Erik

bad6as

iTrader: (17)

well i fixed my problem, try 5500rpm on et streets and got a 1.77 and went 12.5