im arguing with a buddy that front air pressure changes your R/T, now in my head i know how it works, but i can't seem to transfer it to words, anyone got a good way of explaining this?

 

Roll-out.

When there is more air pressure in the tire, the car weight doesn't squish the tire down as much, therefore the car doesn't have to move as far to get past the staged beam.

This is assuming, of course, that you stage consistently.

 

He is saying that when launching that the weight comes off the front tires making front tire pressure changes pointless. Also saying that the car has nothing to do with R/T

 

say i had a stall convertor oh 3,000 rpm.
if i stalled the car myself the vehicle would be loaded
if i let the convertor flash stall which vehicle reaction time would be longer. hm split second for the stall to hit creates a longer vehicle reaction time

 

The car doesnt instantly lift the front tires. It will roll out of the beams first before it lifts the tires off the ground. I have my front end tied down so that the body doesnt lift on the launch, helping my R/T on the pro tree.

 

Front tire pressure is a fine tuning aid for killer R/T's, but it is very dependant on power and chasis set-up as well, that is the reason some cars you can fine tune with front psi and others it does nothing.

My car for example, I used to be able to fine tune with front psi. It would normally be set at 35 psi, for every 1 psi increment I would increase front tire pressure it would translate into .01 on R/T. Think about the rear tires you see on a top fuel car, when they're at rest the tires and deflated and bulgey, when they hammer on it the tires stand up and get skinney-same thing applies to front tires with air pressure, the higher the psi the taller the tire will stand and less footprint it will have and show to the timing beams. That is a reason many foot brake cars run short front tires to help break the beams sooner for better R/T's.

But after I installed the anti roll bar, front psi did nothing for me since the car now jerked both tires completely out of the beams and I was left to staging rpm adjustiment and rear slick pressure to tune my R/T's.

It's all about how the sensors "read" when they get broken, shorter tires/more psi = less roll out and faster R/T's, and the opposite is true-run tall front tires and less psi your R/T will slow down, but again this is very dependant on the cars set-up-what works for one may not work for another.

 

does that front tire pressure translate into any improvements in ET and 60 foot times?

 

psi alone you will probably never see a big difference, we're talking maybe showing .00x-.000x

If you want to affect et, go with alot tallet front tire, like say going from a 26" tall to a 29" tall front tire, the added height will help you get there "quicker" since the tires will trip the beams eariler, but again, we're not talking big gains.