I've been reading alot about rollout speed. In paved oval racing I know you need to come off the corners fast. However I also know that the setup has to work all around. What I've ran across is different rollout calculators. Most of them seem to be for carpet cars. Do these rollout figures apply to paved cars running the BSR capped tires? I'm chasing times and trying to get faster to keep up but nothing seems to be working. Any help or tips will be greatly appreciated.
Thanks.

Josh rollout is rollout. You take the circumfrance of the tire and divide it by your gear ratio. In cap tire racing we dont talk about rollout alot mainly due to the fact that the tire size doesnt change alot from one run to the next. In carpet racing the tire wears dramatically by comparison to a cap tire so you have to check to make sure your rollout is the same every run.

JB Trickle you have PM

JB with cap tires we at teh tri clone measure both rears and take the average for tire size on carpet you use the bigger tire that is the only difference that might be throwin you off that i can think of.

C43go I Run Paved Oval W/ Foams And When I Do Rollout I Do An Average For Both Rear Tires But I Dont Think Every One Does It That Way But That Would Be The Right Way To Do It...

Doughboy, I've always wondered how the tire wear was while running foams on a paved oval. How far do you cut them down, etc, etc? Just curious.

The larger the track the larger the rollout, and the more banked the track the larger the rollout as well. The better your car rolls through the the turn, (you guessed it) the larger your rollout.

On a small flat track your car is constantly turning (and therefore accelerating) which places a larger load on the motor, so your rollout needs to be lower to compensate.

Larger tracks where the car goes straight for a bit does not have to deal with the constant load due to acceleration which will move the optimum rollout up just a touch. Banking also helps the car turn (the ground applies some accelerative forces) which will move the optimum rollout up a touch as well.

Regardless of this, the bane of oval racing is pushing. You should only have to turn the wheel at speed the same amount as if you are crawling through the turn. If this is not the case then you are pushing which is working directly against the motor and will lower the rollout and speed. At a big banked track I try to run less than 8 degrees of total steering, if I need more I find it in the setup, not the steering EPA.

Bob

Bob, just curious how you are measuring steering angles?

Doughboy, I've always wondered how the tire wear was while running foams on a paved oval. How far do you cut them down, etc, etc? Just curious.

I START MY TIRES AT 2.20 AND GO FROM THERE SOME GUYS WILL CUT THEM DOWN TO LIKE 2.10 - 2.08 BUT I BELIEVE IN SIDE BITE SO I TRY TO KEEP MY TIRES OVER 2.10... I CAN USE THIS WEEKEND FOR AN EXAMPLE AT THE BEGINING OF THE MORNING MY TIRES WHERE 2.18 ALL THE WAY AROUND BY THE END OF THE THIRD THE L/F,L/R AND THE R/R WHERE ALL LIKE 2.165 BUT THE RIGHT FRONT WAS RIGHT @ 2.15 SO I JUST TOOK BOTH FRONTS OFF AND RAN THEM ON THE TRUER TO EQUAL THEM BACK OUT AT LIKE 2.15 SO I DIDN'T HAVE REVERSE TIRE STAGGER

Thanks Doughboy. I was just wondering if a set of foams would last more than one day on the pavement. Thanks for the info.

.....................

Owe Yeah They Will Last A While... The Biggest Thing That Kills My Foams Is Chunky.... If I Start A Set Of Tires At 2.22 I Could Run The R/f For About 3-4 Weeks The R/r 4-5 Weeks And The Left Side About 6 -7 Weeks The Rears Are Easy Because You Can Switch Them Back And Forth Every Round During A Race Day To Keep Them Equal But The Fronts Not So Easy Beacuse Almost Everyone Here In Florida Runs 3 Pinks And A Purple On The R/f. So I Either Use My Truer A Couple Times A Day To Keep The Fronts Equal Or If I Will Go Through My Tire Box And Just Switch Out Fronts All Day To Always Keep Them Equal Or Atleast The R/f Just Slightly Bigger Than The L/f.....

Hope This Helps..
Doughboy