LLY: Need Advice for Launching

[Roc8man]

If he's losing traction in the front, why would he lower the rear pressure? In rock crawling, you lower the pressure to gain more traction. Is it different in drag racing?

Thanks

 

[JoshH]

If he's losing traction in the front, why would he lower the rear pressure? In rock crawling, you lower the pressure to gain more traction. Is it different in drag racing?

Thanks

You can't spin a front tire without spinning at least one rear tire, and unless his rear locker isn't working, he's probably spinning both rear tires.

 

[Roc8man]

You can't spin a front tire without spinning at least one rear tire, and unless his rear locker isn't working, he's probably spinning both rear tires.

Is it because of the xfercase? If so, then that makes sense.

Thanks!

 

[ZeroGravity58]

Even with my e locker i can only launch around 8-10 PSI. anymore it spins/wheelhops in the front. I cut high 1.60's like that. That without rear spring clamps (have them havent put them on) and running 35 in the front and 28 in the rear.

 

[JoshH]

Is it because of the xfercase? If so, then that makes sense.

Thanks!

Yep, there is no differential in the transfer case so it is impossible to have 3 tires turning the same speed and one turning faster (or slower).

In an open differential, when you are having tire slip, one tire will spin at ground speed, and the other tire will spin at double the difference between the speed indicated by the speedometer and the ground speed. For example, say your speedometer is showing 30 mph but you are only moving 5 mph, one tire will be rolling at a speed of 5 mph while the other is spinning at a speed of 50 mph (30-5=25x2=50). Now, since the front driveshaft and rear driveshaft are spinning at the same speed, you will either have one tire spinning at 5 and one at 50 (with an open differential), or you will have 2 spinning at 30 (if you have a rear locker or spool). Hopefully I explained that so it makes sense.