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Author Topic:   Celica push
Zypher
Dirt Roller

Total posts: 22
posted April 16, 2005 06:32 PM  
I recently had a problem with our celica being tight getting in the corner but was fine if it ever got turned. I had LF 13 LR 15 RF 15 RR 19. Should I change springs or weight placement or just make an air adjustment? Thanx

Champ2x36
Dirt Full Roller

Total posts: 29
posted April 16, 2005 10:18 PM  
I would add air to the right front. At that pressure the tire is probably rolling under badly in the corners. Try about 24 pounds, that should plant the tread a lot better. Seems about every car we ever ran on dirt would do pretty well with 24 pounts in the right front.

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Zypher
Dirt Roller

Total posts: 22
posted April 17, 2005 07:10 PM  
When I put 24 lbs in the right front is that not going to put alot of weight on the left rear causing a worse push?

bigcityracer
Dirt Freak

Total posts: 431
posted April 18, 2005 09:17 PM  
quote:
Originally posted by Zypher:
I recently had a problem with our celica being tight getting in the corner but was fine if it ever got turned. I had LF 13 LR 15 RF 15 RR 19. Should I change springs or weight placement or just make an air adjustment? Thanx


My first thought would be raise the rear or move some weight in rear to right side.

YotaRacer
Dirt Full Roller

Total posts: 37
posted April 18, 2005 09:41 PM  
Just curious to know how far the right front is rolling over. If your front springs are to soft you will bottom out the strut and cause a push. The low air pressure in you tire will make it more noticeable. I use a plastic wire tie around the strut shaft to check for the amount on "maximum" travel. then look just below that for a dust line to see where your normal travel is. This is why sometimes increasing airpressure will cure a push. It actually increases the amount of spring rate enough to stop the car from bottoming out. I also look at the sidewall of the tire to see just how far it is rolling over. The further it rolls over the less contact patch you have. Sorry to be so long sinded but hope this helps.

Zypher
Dirt Roller

Total posts: 22
posted April 19, 2005 02:49 PM  
Ok.. all that is good info I have another question.. I thought that putting air into a tire would shift weight off of that tire and put it to the oppisite corner is this correct.. If so then unless the rf is rolling over or the rf strut is bottoming out then shouldn't putting air in the rf put more weight on the lr and cause it to be tight?

19J
Dirt Freak

Total posts: 370
posted April 19, 2005 07:37 PM  
I dont have a celica or fwd but here is what i will tell you. Its a teeter totter. You have to balance it out. How much can you do here and there but yet not mess with this over here. IF you add say 3 lbs it wont be as drastic as you think in the aspect of weight transfer it might help handleing a bunch but it wont transfer a lot of weight. What im saying is its not drastic. Find what works with your car trial and error thats how ive learned most things.

YotaRacer
Dirt Full Roller

Total posts: 37
posted April 19, 2005 09:48 PM  
When I first started racing celica's I had the same problem. I increased the air pressure and it cured some of the problem. I increased spring rate and cured some more of the problem. I built an adjustable bolt for the front swaybar and could fine tune the car for the track conditions. As stated a couple of pounds won't change the car from one extreme to the other. If your strut is bottoming out you can increase spring rate without changing the weights of the car. But a bottoming out strut will act just like to much spring. Your tire air pressure will act like a spring and shock combo to some extent. Some articles say 1lb of air is like upwards of 15+lbs of spring rate. That is why increasing pressure may help cure a push. If this is the case then you need to change spring rates to a higher spring that is the same height as what you currently have so as not to change your weight percentages. I use a supra front spring in the right front because it has a 25+lb greater spring rate I know some people use a 300lb spring in the right front. Stock celica is about 200lb hope this cure some confusion up for you and good luck with the season.

Mark

YotaRacer
Dirt Full Roller

Total posts: 37
posted April 19, 2005 09:52 PM  
I forgot to add I run 20RF 18RR 16LR 15LF. Spring rates are 250RF 200LF 150RR 175LR. What offset are you running on your wheels. That can also makes a diff.

Zypher
Dirt Roller

Total posts: 22
posted April 20, 2005 06:41 PM  
Thanx alot, all that kind of cleared up my confusion somewhat. I think we have only about 1 inch of offset in our wheels.

dhsrcjh
Dirt Full Roller

Total posts: 59
posted April 26, 2005 06:12 PM  
We ran a Celica on a 3/8 mile dirt track and used these springs and tire pressures.
RF-300 15# air
RR-125 14#
LR-150 12#
LF-275 10#
This was with Hoosier dirt tires.
Had a bad push getting in the turns at the first practice. Unhooked the front sway bar and it never had another push in it. Also I did not run a rear sway bar.

Zypher
Dirt Roller

Total posts: 22
posted April 26, 2005 06:28 PM  
Thanx we dont run sway bars and its not a bad push, some of it is the driver not letting the car breath any just get half way off the pedal about .01 sec and stomp it back.

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