Car takes too long to get fast

[tlr_28]

I'm running at a .375 mile high banked track called Kingsport speedway if you want to see the track you can find it on YouTube.  I'm pretty fast but it takes the car 6 or 7 laps to really get fast. The handling of the car doesn't change it just gets fast. Right now my spring set up is 325 RF 300 LF 275 RR 250 LR. My weight set up is 48.5% cross, 52% left and rear. Camber is at -5 RF and 2.75 LF. Air psi is 31 RR 29 RF 17 LF 10.5 LR. Like I said before the car drives really good and is fast, but by the time it gets really fast it's too late in the race. Any suggestions on what to do? Thanks

[tlr_28]

Forgot to put ride height... Front is at 3 3/4 in, rear is at 4 in

[Winterracing]

raise your air pressures a bit? If the handling doesn't change much i'm not sure why its not fast right from the start.  Being that it is fast at the end it seems like your static setup would be good (caster, camber and such) but the air pressures, being the only thing  changing could be an issue.

Dan

[tlr_28]

I have tried that and it just made the car too loose. Thanks for your input

[IraceLegends77]

Handling doesn't change over those 6-7 laps? I think the air pressure is to high on the right side. But if the handling is the same and it gets faster it just might be you getting in a groove. Sometimes its the the driver that is getting faster.

[Earnst85]

Maybe the car comes alive when your tires come to temp. I don't run asphalt, but we grind tires to remove the glaze created by heat cycles. Maybe once the glaze gets scuffed off, the tires come alive.

[knoxracing]

Who cuts your tires and how many races do you get from a set of tires? Your asphalt spring package is interesting for sure. Six laps in will heat those right sides, especially with that stiff rr spring. Tire temps would be beneficial to fixing your problem, but tire cutting info will help.

[tlr_28]

This is a concrete track. Should have mentioned that. I cut my own tires. Got the machine from Phil Tuel and he cut a couple tires with me showing me how to do it. I get about 6 or 7 races on them depending on how thin I cut them to begin with

[s10custom]

What Scott said....also sometimes motors don't come in until they get a certain amount of heat into them.

Robert

[tlr_28]

Thanks for all the replies. Do you think that going with softer springs all the way around would help the tires build heat faster? I'm almost bottoming out now with the 325

[knoxracing]

The concrete would be part of the situation. I really agree that softer REAR springs would help. motor is not your issue or I should say is not related to this issue. Try a 180 lr and a 220 rr on the concrete.

[knoxracing]

I would also bring that left rear air closer to the left front pressure, 10.5 is really low compared to your other pressures. Hop this helps

[tlr_28]

Soften the rear springs up even though my right rear is bottoming out?

[knoxracing]

180 lr 220 rr, do not be concerned- start there and play with it. I would bet the most common rr spring on pavement is a 200 lb spring. you need body roll to help the  car rotate.

[tlr_28]

Okay I'll try that. Thanks everybody for the suggestions!