tire pressure and rpm

[onecobra2fear]

My cobra has a stock supension, w/ kb hard launch kita and diff. brace.

power 517hp/498tq
tires bfg g-force dr. 295/35/18
what pressure should I run,
and what rpm should I leave the line?

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[onecobra2fear]

I'm giong to DaGrove tonight to try out my new tires, where should start with my tire pressures?

 

[FirstWorldProblems]

I'm giong to DaGrove tonight to try out my new tires, where should start with my tire pressures?

Try 17 PSI w/ a nice long burnout. As far as what to launch at, it depends. U'll have to try different RPMs and adjust based on whether you spin or bog off the line.

 

[Wiked03]

Try 17 PSI w/ a nice long burnout. As far as what to launch at, it depends. U'll have to try different RPMs and adjust based on whether you spin or bog off the line.

Agreed. There is no magic number, you just gotta keep trying it over and over to see what works.

I would try leaving at like 2500 or 3000 the first pass. If it hooks, move the rpms up, if not move down.

 

[onecobra2fear]

thanks! I will update you on my results.

 

[onecobra2fear]

My cobra has a stock supension, w/ kb hard launch kita and diff. brace.

power 517hp/498tq
tires bfg g-force dr. 295/35/18
what pressure should I run,
and what rpm should I leave the line?

track results

tire pressure 17lbs
1.78 60'
left the line @ 4200 still bog a little.
12.57 et @ 111 mph

 

[hj16]

track results

tire pressure 17lbs
1.78 60'
left the line @ 4200 still bog a little.
12.57 et @ 111 mph

What the hell happened? With the kind of power you're making you should be trapping at least 120. Did you miss a gear? or two?

On a side note thats a great 60' for 18s... good job there

 

[Wiked03]

Nice work on the launching... that is agood 60' for 18's for sure. If you were still bogging you can probably come out a little harder.

I agree with Hank though... your MPH is pretty low for your HP numbers.

 

[onecobra2fear]

I am still having a problem shifting. If I learn to shit without pausing, I may see better e.t.'s and 11's

 

[onecobra2fear]

I am still in the need of a driver mod!! I suck when it comes to shifting, I pause with every shift.

 

[Since 1964]

17lbs is nice, and you'll end up down around 14-15 as they wear.
DO NOT smoke the shit out of them.

Go around the water box and back in with your rear tires, by having the track Rat set you up at just 1 revolution backwards into the water box.
Starting on the front edge of the water box now, dump second gear at like 3500+ then jump on the brakes and let it walk out after you reach 5500-6000RPM's. This sounds easier than you think, and it is, but it takes practice in order to do it and still be NICE to your car. 2nd gear will break a wet tire like nothing, and this is NOT a tire that requires heat, just a clean off.

You should be able to launch at 42-4800 but do NOT "dump" the clutch, just ease it on as quickly as possible. You will learn a clever little dance with your left foot and the delivery which will make for a quick launch without bogging the motor, which is easy to do. (Bogging that is)

Again, DO NOT smoke the shit out of a drag radial, BFG's or MT's both say NOT to do that, and they're right, it's just worthless and wastes tire life.