Finally Hitting The Track

Chevy1925

don't know sh!t about IFS
Staff member
Oct 21, 2009
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Phoenix Az
I did a lot of testing last season on how weight of the tire wheel setup will effect tracks times. Stock pyos and 265 load range E tires weighed in at 63lbs. My 18x9 raceline raptors with 285/65 load range E toyo at2 weigh in at 89lbs. Stock pyos with 275/55 M&H drag radials weigh in at 37lbs. Truck went 12.5@108, 12.7@107, and 12.2@111 all on the same tune. Wheel/tire weight in my experience can effect your track times greatly.

so what your sayin is..... my 125lbs+ tire/wheel combo isnt helping things :roflmao:
 

Chevy1925

don't know sh!t about IFS
Staff member
Oct 21, 2009
21,681
5,835
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Phoenix Az
I don't know. I really would like to hit the track this winter but I'm afraid I may not pass tech. Firebird is being strict on rules and I believe my crank height is too high. I'll go try one of these days. She should be quicker than before


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TheBac

Why do I keep doing this?
Staff member
Apr 19, 2008
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Mid Michigan
Agreed also. On my CCSB LBZ stock twin set-up with "E" rated worn out A/T Michelins and PYOs I have cut 1.60 60 times with just spring clamps and proper tire psi.

I highly recommend looking at tire PSI from front to back. Most people look at tire PSI how it is sitting in the pits. This is not how the truck goes down the track.

The old thinking the front is heavier so the front tires need more air does not work if running decent HP because of weight transfer. Have someone video the truck at the different lengths of the track, 60,300,660,etc and see what the tires are doing, then average things. I run close to the same psi from the front to the back, this way I'm not scrubbing speed from the T-Case fighting the front to back ratio difference. There is no perfect answer as every truck weight ratio from the front to back is different. There is ET to gained by looking outside the box at tire pressures. :)

Listen to this man. His advice helped me to consistent 1.6x-60fts on Toyos/PY0s and low 12s in a CCSB. I even pulled off a 1.59 once. 36F/32R was where I started the air pressures and went from there.
 

Chevy1925

don't know sh!t about IFS
Staff member
Oct 21, 2009
21,681
5,835
113
Phoenix Az
Listen to this man. His advice helped me to consistent 1.6x-60fts on Toyos/PY0s and low 12s in a CCSB. I even pulled off a 1.59 once. 36F/32R was where I started the air pressures and went from there.


Ask Rob how well a 4:10 gear set does in the front end with 3.73s in the back lmao.


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IdahoRob

New member
Jun 5, 2007
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Ask Rob how well a 4:10 gear set does in the front end with 3.73s in the back lmao.


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:D Hey, I was just transfer case testing for GM. Darn T-Cases are amazing holding up to 80mph bunny hops. That was an interesting ride.