How do you launch at the track? - Page 3 - Diesel Bombers

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Old 06-13-2010, 03:33 PM
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Location: San Diego, Ca
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I do a small burnout if I can't avoid the water box, then click 4hi on, T/H mode, and turn OD off if its 1/8th mile. Roll in and light my pre-stage lights, bring it up on boost to about 15 psi, then creep into stage lights, as soon as I see the third amber I let off the brake and nail it. I run 30 psi front, 25 psi rear running Nitto highway terrains in 325/60R18.
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Old 06-16-2010, 11:29 AM
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I leave at about 30psi boost and tires are at 40 around the truck. I used to click it out of 4wd just after the 60', but now I have to drive the truck a little more, so I take it out once I finish so it's easier to turn off the track. If your doing boosted launches with a factory output it will last till right around 500hp and then it will snap
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Old 07-05-2010, 08:29 AM
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Location: Tennessee
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What gear do you guys take off in on the track with a 5 or 6 speed? I have a 5 speed and I rarely use first even when daily driving. We also have a 6 speed and im thinking of taking it to the track but i heard from someone that you can take off in third as quick as you can in 2nd on a 5 speed? Just wondering. Would try it but dads getting some head work done
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Old 07-05-2010, 10:36 AM
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Originally Posted by 24v'd_Fury View Post
Do I take it outta 4 wheel drive after I launch or just leave it?
i leave mine in 4wd all the way til i pass the finish line and then shift it into 2wd or when you turn off the shutdown lane its gonna grind and that no good
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Old 07-06-2010, 01:45 PM
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i have only ran in the 1/8th i have tried a couple of different ways to launch. with an auto it will be easy to build boost for launch, with my 6 speed it is tricky and hard to get a consistant reaction time. i have launched in 3rd with my 6 speed but u have to build boost and have to drag the clutch to keep it from bogging. my best times came from no boost and 2500 rpm launch. i leave it is 4x4 all the way through the traps and it ran a best of 9.2
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Old 08-11-2010, 09:41 PM
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Join Date: Aug 2010
Location: Maricopa, Az
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Does the 48re have problems with the input shafts? Is it the 4wd launches that does it or is 2wd just as hard on em?
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Old 08-13-2010, 06:21 PM
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Location: crooksville
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spool it up and let it fly 4 wheel drive CAUTION you may break a inuput shaft if it is stock or a fexplate
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Old 08-13-2010, 10:54 PM
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Join Date: Apr 2009
Location: Kingsville MO
Posts: 779

43 lbs of boost on a 62/80 turbo 4wd 3rd gear 6 speed.. 3.54's.. it went pop i went ****.. hey i got 2 output shafts for the price of one now.. ...damn its fun watching the passengers face after u pin them to the seat and smoke all 4 tires off..
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Old 10-01-2011, 02:45 PM
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Join Date: Sep 2011
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Made consistent 14.2 passes launching in 2wd with 35" tires and I still spun one time. I have a built auto trans, but will the transfer case in these cummins trucks hold up with 4wd boost launches or at 100+MPH?
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Old 10-02-2011, 11:34 AM
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Location: San Diego, CA
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Originally Posted by 24v'd_Fury View Post
Do I take it outta 4 wheel drive after I launch or just leave it?
Don't worry about keeping it in 4WD, straight line for less than 20 seconds at a time ***** to the wall won't hurt it, high speed turns in 4WD are what cause "rapid disassemble." Just take it out of 4H and back into 2H when you pass the time boards because it's a royal pain trying to make that turn onto the return road with the front axle locked.
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