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Author Topic:   Ballist placement
posted November 13, 2002 04:52 PM
We are remounting our fuel cell to fit crossways just behind rearend, putting battery from rear of car to above rearend. Also putting our wieght mounts in front of rearend. My question is by moving all this wieght forward will it help alot for corner handling? Or will it not be to noticeable? I estimate that we are moving a good 100 to 150 pounds of wieght from behind rear 36 inches to above or in front of rearend. We are thinking this should help for corner entry? This is what you want isnt it? Will it help keep rear from sliding out, not that we had a problem but just trying to gat car to work good in next groove up above traffic. Our track gets really dry and ends up being follow the leader on bottom. Someone once told me to run more right rear on really dry, has anybody tried this or is it not even worth trying?

posted November 13, 2002 05:19 PM
moving all that weight forward you will loose you're rear percentages. If and especially on dry tracks you're rear percent isnt high enough you will not have any forward bite. Most car's now run between 57-60 percent rear weight.

old racer
posted November 13, 2002 08:31 PM
Am I actually going to loose rear percentage? What we are tring to do is just move the wieght closer to rearend, thus reducing the pendualim effect. Kind of like a Lamberdini car. Even if I have to ad more wieght, wouldn't this be better than having all the wieght behind swinging the rear into the corner?

posted November 14, 2002 09:05 AM
A lot of times on the car I help with, we run upwards of 60 percent rear. You need the rear weight to keep the tires planted, we use other adjustments to keep the rear end from sliding out with all the lead we pile on, like more side bite. It worked well for us although we rode wheelies most of the year.

posted November 14, 2002 10:20 AM
i say your doing the right thing....

if you need rear bite you dont need it on your scales in your shop, so dont sweat it, all you have to do is make wt transfer to the rear... on the track where you actually need it.

old racer
posted November 14, 2002 06:42 PM
the ? is why are people so stuck on scales?? if your car needs more forward bite is it gonna be better to ??
1. add 25 lbs on the bumper so the scales read right?
2. add trailing arm angle
3. soften front rebound?
4. soften rear comp
5. lower air pressure both rears??
6. lower panhard bar/ rear rollcenter?
7. stiffen rf spring
8. soften both rears?
9. add cross
as you can see the list can go on and on, but the real ? is on track performance and the ability to make changes and see the results, if your not a smooth or consistent driver youll never really know if your changes work.

i think scales are great to get to legal wt and to get a base set up and after every race, after all the track changes i record everything, every angle of every bar on the scales... so i can go back to that next time i go to that same track.

i am just not a believer in scales doing it all...

i dont know everything but i have tried just about everything, one class i race in was 3300 lbs the other was 2800 so i took out 350 of lead between the wheels and it was slower, more eratic and believe it or not needed stiffer springs all around to keep the valances of the ground...i had put about 50 on the cell behind the rearend to get the same rear % and i could feel that 50 i guarantee it.......... pulled that 50 at track and lost rear but was way better on entry.

old racer
posted November 15, 2002 08:28 PM
Lets say we have a car with 59% rear with no lead. Then we have a car with 59% rear with 100lbs of lead. Dont both cars have 59% rear?I dont see the penduilom effect.59% rear = 59% rear. Iam not queer for alot of rear %.

old racer
posted November 16, 2002 09:05 AM
not modifieds sorry i thought a race car was a race car... and the lighter car needed less rear wt and transfered sooooo much better it had to be re sprung and shocked entirely stiffer.

sorry if im wrong i am trying to pick everyones brains on here too!!!

old racer
posted November 18, 2002 09:19 AM
It is a imca car with the McCleary tires. What I am trying to do is get rid of pendualum wieght that is so far behind the rearend. Hoping that this will help for corner entry. As for hooking up I think I will still have the rear percentage, plus trialing arm angles and thusforth. The car is a 3-link,750lf,700rf,200lr,175rr. This year we are also going to try a 150 on rr. The car worked really good last year, but the problem is our track goes dry slick with no rubber at all. Every one ends up on the bottom in a trian. What we are trying to do is get the car to work in the high groove, tried it last year but just lacked that little bit of x-tra that we needed to pass. I am thinking that the softer RR sspring will get the car to roll more,{ our corner speeds get so slow that the heavier spring just doesnt seem to let the car rollover for the side bite}. We are also going to a 15 inch shorty panhard and will have brackets for both front and rear, does anyone know which is better? Nobody here runs one, or even a j-bar, They all have long panhard bars in rear. I noticed last fall at a usmts show alot of guys had the shorter panhard bars, they seemed to be much better and could really transfer wieght to the rear. Was the short bar doing this? Or is there another secret?

old racer
posted November 18, 2002 12:44 PM
old racer,

10 inch goodyear bias slicks.....
durometer 50 on ls, 60 on rs.
lots of motor 14-1 383 lw everything open intake carb etc...

later jj

old racer
posted November 19, 2002 03:08 PM


posted November 22, 2002 08:41 PM
monster i say atleast try it but try to keep it where u can change things back easily if u don't like it. my theroy in racing u can't be afraid to try something, just because everyone isn't doing that it might fit your driving style better or it is something that nobody has thought of before. i say go for it man there has to be a couple play days before the season and tell us all about how the car worked.