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hot_rod
06-15-2010, 04:48 PM
I was wondering if anyone has had this problem. I have a 83 Monte Carlo. 9in rear with 6.20 gear. running a 3/8 mile D track with low banking in corners. Springs are lf1100, rf1200 rr250, lr 200 (those are the numbers, not sure whether thats exactly where there at, though). I have jack bolts in the rear only. I run Pure Stock. I ran the car for the first time this past weekend and entering the corners was good, but coming out of the corners i would slide up to the top. losing bite or something when coming out. Any help would be greatly appreciated.

Animalgfx
06-15-2010, 06:51 PM
Just my opinion.... And I am By far no expert....

First thing I would do is switch the rear springs... 250 on the LR 200 on the RR.

Second... An issue I as a driver am always dealing with..... IS the car good on entry or is it too tight.... If, in my opinion... You have to put a bunch of wheel into it.... It may be too tight... and the after affect is... You are chasing the car up the track...

Dirtrunner35
06-15-2010, 07:43 PM
I agree switch springs, what tire pressures are you running?

hot_rod
06-16-2010, 09:08 AM
I checked the springs last night and I was wrong on the rear springs, they are reversed. As far as tire pressure, I am normally running 18lf 21rf 16lr and 22rr. I have beadlocks on the right side only. Also we run a 8" wide wheel with 3" offset all the way around. Tires are 255/60R15. According to the rules, we cant sipe or groove the tires at all. Also no chemical additives to the tires to improve grip. I am putting a lot of wheel into, but I dont think that I need to as much as I am. Like I said in the original post, this was my first night in the car. We have a 2:1 steering quickner, and I am not used to it yet. I think that I am trying to steer like a car without a quickner, and it is causing me to oversteer, then have to countersteer to much.

The Rudds 88
06-16-2010, 09:42 AM
We run 12 inch rims and late model tire's, but all that air on the left side tires still sounds like a lot to me. We only run 8-10 in the lr and 9 in the lf.

Egoracing
06-16-2010, 01:54 PM
K.I.S.S.
Keep
It
Simple
Stupid
Words to live by!
If the car is going on good and spinning out on the gas the RR is out driving the LR and it is going around the front of the car. If the car is going in good and pushing up then the LR is out driving the RR and it is pushing the car up and out of the track.
Have you ever put the car on scales to see where the weight is located and what your %'s are? Without this any information is a crapshoot and you will bnever get anywhere. It sounds like you are to rear heavy and it is trying to keep the car straight and just pushing the front off the corners.
Check the springs on a spring rater and put it on scales.

hot_rod
06-16-2010, 04:49 PM
we put it on scales recently and it was about 51.9% R, 49.1% C and 50.6% L. I am pretty sure that these are the numbers, but I dont have the set-up sheet anymore. Everything scaled out pretty well. Also these precentages are without me in the car. It weighed 3260 (appx) without me in it.

The Rudds 88
06-16-2010, 05:15 PM
You set the car up without being in it? Not saying that doesn't work for some people, but I wouldn't do that. :eek:

Dirtrunner35
06-16-2010, 08:22 PM
I would add some cross, 49% is low, check your tires temps next time out. I ran 18 left and 20 right on tire pressures with the same size tires you have. I never ran higher pressure on the RR, if I did it would be lose.

wiley78k
06-18-2010, 10:08 PM
i would run lf-9-10, rf- 12-14, lr- 8, rr-10. this is what i run on 3/8 oval track and the car seems ok. i have 52.5 left, 53.5 rear, and 51.5 cross. seems ok to me

The Rudds 88
06-18-2010, 10:13 PM
i would run lf-9-10, rf- 12-14, lr- 8, rr-10. this is what i run on 3/8 oval track and the car seems ok. i have 52.5 left, 53.5 rear, and 51.5 cross. seems ok to me

I wouldn't only put 10 in the RR! maybe if you have a beedlock. I'd try 12 for the lowest.

timmy20t1
06-19-2010, 04:24 AM
i would run lf-9-10, rf- 12-14, lr- 8, rr-10. this is what i run on 3/8 oval track and the car seems ok. i have 52.5 left, 53.5 rear, and 51.5 cross. seems ok to me

these numbers sound good. but as the next post says go up a couple lbs on the rr bout 12 lbs and check the tire rollover after a few laps. and adjust tire pressure as needed.

gun91
06-19-2010, 02:05 PM
I would add some cross, 49% is low, check your tires temps next time out. I ran 18 left and 20 right on tire pressures with the same size tires you have. I never ran higher pressure on the RR, if I did it would be lose.


49% cross is NOT low for some drivers!! I have won 70 features on dirt in several different types of cars and most time that has been with 49% or less cross! Every driver is different, I don't like a car that don't want to drive into the corner on its own and usually if I get over 50% cross, it feels to me really tight. Some guys win races with 53%+ cross and 200 lbs+ of left rear (or wedge as some call it), I usually run about 49% cross and left rear as low as I can get it (usually less than 50 lbs is good for me).

Everybody likes different setups, so his setup may not work for you but that don't make it wrong.

gun91
06-19-2010, 02:07 PM
Also, his cross % is without him in the car so it will more than likely be higher with him in the car. Unless his cage is closer to the front than the rear! LOL

hot_rod
06-28-2010, 08:55 AM
Well I tried the tire pressure drop this weekend, it helped a lot. I didnt go as low everyone recommended. I went LF 13 RF 15 LR 12 RR 14. I tried to tighten the car up a litte with the jack bolts, but it was still a little loose. But I didnt do near as much sliding. I will try to go lower next week. Thanks for everyones advise.

bushracing67
06-28-2010, 06:24 PM
49% cross is NOT low for some drivers!! I have won 70 features on dirt in several different types of cars and most time that has been with 49% or less cross! Every driver is different, I don't like a car that don't want to drive into the corner on its own and usually if I get over 50% cross, it feels to me really tight. Some guys win races with 53%+ cross and 200 lbs+ of left rear (or wedge as some call it), I usually run about 49% cross and left rear as low as I can get it (usually less than 50 lbs is good for me).

Everybody likes different setups, so his setup may not work for you but that don't make it wrong.


you are really close to my numbers, i run 30ish on bite, i have ran the cross as low as 45, normally never over 49... dont really pay much attention to cross, set ride heights and set bite where i want it and call it done

hot_rod
07-15-2010, 02:53 PM
How do you check for the bite? We have the option on our scales, but we dont really know how to change it. Or what causes it to go up or down?

charcoal01
07-15-2010, 04:09 PM
How do you check for the bite? We have the option on our scales, but we dont really know how to change it. Or what causes it to go up or down?

when guys talk about bite its normally LR bite, which is your left rear wheel weight minus your right rear wheel weight. so say you have 750 lbs on your LR wheel and 700 lbs on your RR wheel, you have 50 lbs bite in the left rear.

4509Enos
07-16-2010, 07:33 PM
we put it on scales recently and it was about 51.9% R, 49.1% C and 50.6% L. I am pretty sure that these are the numbers, but I dont have the set-up sheet anymore. Everything scaled out pretty well. Also these precentages are without me in the car. It weighed 3260 (appx) without me in it.

Hey guys, I just noticed, if the car has only 50.6% left and 49.1% cross with 51.9% rear this car may be RR heavy ???

dirt2
07-21-2010, 02:07 PM
The car does not have enough left side
percentage or enough crossweight (bite).

dirt2

koolaid89
07-26-2010, 11:54 AM
Any updates Hot Rod?

hot_rod
07-26-2010, 12:30 PM
Well we rescaled the car this weekend and weve got 51.7 % Rear, 51% Left, 49.5%. We actually did fairly decent this weekend. For only being the 7th time in the car or stock car really, I qualified 9th with a time of 22.335. The car was handling pretty good. I tightened the car up for the heat race, that was a mistake. The front end was pushing hard. The track was extremely dry slick. For the feature, I loosened the car just a little bit. It was good at the beginning of the race, then as fueled burned off it got way to loose. I have been keeping the same tire pressure adjustment that everyone on here has recommended and it helped a lot. This saturday night was my first night out in two weeks, from where I flipped it three weeks ago. I also changed springs in the front, kept same ratings, just went to an 11" versus a 9 1/2". I think that helped coil bind a lot. I think that is about all I have right now. Anymore help is always greatly apprieciated.

racerm146
07-26-2010, 12:51 PM
We run a stock clip car, and whenever ours slides we move some weight up to the cage area so it tries to rock the chassis over. Generally providing all other weights are correct. Mike

koolaid89
07-26-2010, 01:16 PM
did you scale the car with you in it this time?

hot_rod
07-26-2010, 02:58 PM
No I had to leave and get ready to go to the races when it was scaled. So everything is without me in it.

For RacerM146, my weight is set pretty high above the rearend. I am getting plenty of body roll. The front tires are actually rubbing on parts of the cage above the frame rails.

The Rudds 88
07-26-2010, 07:21 PM
Waste of timing scaling the car without you in it. :eek: :rolleyes:

hot_rod
07-27-2010, 09:33 AM
I will try to put the car back on the scales with me in it this weekend. What should be the numbers when we do it with me in it? We have always scaled the car without the driver. We have three pure stock cars that my family runs, and at least one it is set-up pretty good. (not mine!)