Launching an AWD/4WD

otter1363

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Been thinking about this a bit lately. I launch in 4WD hi. I was getting some shudder in the 60' so I put a set of Caltracs on. No mo shudder and helped my 60. Only thing is I am getting more front end lift than I want. My pig is lowered so with the additional lift during launch I have some concerns about gettin the CV joints straight and blowing 'em out AND I like havin my front tires snug on the ground out of the dig.

Was thinking of a couple routes to go - First slap some adjustable shocks on to keep everything as level as possible. Easy enough. Then I was watching some monster trucks the other night and bam - what about puttin some limiter straps on the front to keep it from rising up. That sound stupid? I never gave much thought to 4WD launching before, not really sure how to approach it...
 

OffshoreDrilling

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Toss limiters on it or just run it rwd and get a stickier tire out back. Less drivetrain loss in 2w vs 4w and then you want the weight transfer it is already doing. Run a 28"(stock is 30" or so?) tire out back, assuming you have a 4.10 gear. Will give you plenty of headroom in the trap speed if you want to make it faster.
 

OffshoreDrilling

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The shorter tire should knock another .2 or so off of your ET too.
 
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otter1363

otter1363

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Yah - I need a 30.5" or bigger tread, have 4.56 in it. Ran a 28.8" and trapped ~ 6500. A bit steep for these hemis IMO. Hard to find a good 30"+ sticky in a 17 - 20 rim

Should have gone 4.10 but when I did the math I never calc. TC loss :picard:
 

OffshoreDrilling

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If your third gear is 1.0 there is absolutely no way you ran through the traps at 6500rpm, thats 122mph....

I used to run a 25.7" tire (nitto 555r drag radial 275/40/17) and trapped 107mph, at 5700rpms.
 
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otter1363

otter1363

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yes 107, 25.7" with 4.10:1 is 5700 - I'm 4.56.

I just did the math and it shows close to 5900. I dont think converter slip would be that much (?)so I guess I must have been seeing things. Guess I should log it and I'll know for sure eh...

Is your SS AWD?
 

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