Launching

[Deadeye_88]

hey guys i just came back from the track and i got some bad times. my best run (1/8 mi) was a 9.5 with a 2.1 60ft and that was with the performance tune that came with my livewire. All of my runs i launched at 2000rpm and used 4wd. ill spin and have bad wheel hops on all tires. i even did a small 2wd burnout, then put it into 4wd for the launch. anybody know what im doing wrong?

[Deadeye_88]

any help is appreciated

[GM Duraturd]

I have always heard not to do a burnout first. It heats your rears and give uneven traction to the front and rear on a 4x4 launch, which could cause things to break.

[fordfan30]

have you tried lowering tire pressure any? you may want to launch at 10 psi boost instead of 2000 rpm, i would think at that engine speed you would have too much boost. i am not sure this is correct but it seems logical to me. hopfully someone with more track time will chime in and we can both learn something. you may want to consider removing some weight spare tire, skid plates, tailgate and run on less than 1/4 tank to get those e.t.'s down when you hook up you should loose about 2 or 3 tenths without the weight.

[tech10002]

Yep, it sounds like you had too much boost built. Mine will burn all 4 tires as long as I stay in the throttle if I launch above 15 PSI. Try a power brake in 4wd, and as soon as you hit 15 PSI, floor it and let go of the brake. That will give your best launch with no wheel spin. To really get some better times, get some custom tunes too.

[06LariatF250]

the last time i was at the track i did a little burnout and launched at 2100 and pulled a 1.57 60ft and i got alot of wheel hop and torque steer

[fordfan30]

06lariatf250 what kind of time did the 1.57 60 ft get you? that is low. i see you have a crew cab. is it long or short bed and did you go 1/8th or 1/4 mile? i ask cause i plan on running this week 1/8th and would like to see what times i should expect.

[farmboypowerstroke]

never do a burn out when your launching 4x4

[AvroAero]

Originally Posted by GM Duraturd

I have always heard not to do a burnout first. It heats your rears and give uneven traction to the front and rear on a 4x4 launch, which could cause things to break.

Sounds right, but I think the front would always have more traction in a pickup since the back is light.

[06LariatF250]

i went 13.9 i forgot the mph and i have a short bed