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Author Topic:   forward bite(or lack of!)
racer18d
Dirt Roller

Total posts: 14
posted April 30, 2004 08:31 AM  
I have a three link and I am trying to get forward bite. I have lf 650,rf600,lr225,rr200,afco pullbar(600lb.)20* down,shocks are 75-4 lf,76-3 rf,93-5 lr,95 rr.percentages are,cross 51.1,left 52.8,rear 53.3,I realize that I need more rear% but at the same time my car is already about 100lbs. heavy.I have a 22 gal. fuel cell and I run on alky so the burnoff also affects me. My question is (I guess!)will the added weight to increase my rear % be the answer or is there something else I can do to increase forward bite without adding the weight?P.S. running a 3/8 mile track , dryslick,and running g-60 tires. Thanks

Chad
Dirt Freak

Total posts: 269
posted April 30, 2004 09:16 AM  
First, I would recommend adding the weight (at least 100 lbs)- try and keep it centered in the chassis, infront of the fuel cell about in the middle. I know weight is always a concern in racing, but you need to get the chassis to handle. Many old and heavy cars win races every weekend across the country. My old Larry Shaw car weighed over 2800 lbs, but it was fast. Next, I'd make sure the LR trailing arm has as much angle as you can get and level the RR arm. This will induce roll steer and help plant the LR tire. Also, with the LR spring mounted solidly in front, it will cause the cross weight to increase when you get on the throttle and the pinion rotates upward- tightening the car. You didn't say, but I'd suggest running the RR spring behind the axle. Also, you should lower the spring rate on the RR to at least 175 but you may want to go to 150 (you may be able to lower the spring rate on the LR to 200). Lastly, why are you running the springs reverse on the front? Are you trying to help the car turn in better at entry. If you can put the heavier spring back on the RF and make other adjusts to help entry, the stiffer RF spring will help alot on exit. Your RR shock looks too stiff. You should be able to run a 94 or even 93. You didn't mention anything about panhard/j-bar, but this has a big effect on hooking up your chassis.

de94wcc
Dirt Forum Racer

Total posts: 87
posted April 30, 2004 09:36 AM  
I agree with Chad. You need lead. Have you thought also about running a stiffer spring in your pullbar? Most of the Afco bars today come with a 1050# spring. That would help with initial bite off. What about putting a larger fuel cell in?

racer18d
Dirt Roller

Total posts: 14
posted April 30, 2004 09:55 AM  
Chad, Thanks for the reply,Here is some of the info I forgot to list, The lr spring is in frt. and the rr is behind. I have a short panhard bar(10 1/2") with about 15* in it. The frt. springs are reversed because I read somewhere that it would load the lf which help pull the car into the corner,also what do you mean by "other adjustments to help with entry" if I reverse the front springs? When you say"max angle on lr bar and level rr" do you mean 0*? Thanks

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted April 30, 2004 09:58 AM  
You need a lot more rear. We had a 3 link car that we run 60% rear and it was heavy but it worked. IF you have enough power to pull the weight and can get the car to hook up you will be faster than a lighter car spinning tires.

I agree with the previous post about adding lead preferably near the fuel cell and centered side to side. If you can take as much weight off the front end as you can or move as much weight rearward as possible that will help.

racer18d
Dirt Roller

Total posts: 14
posted April 30, 2004 10:00 AM  
I thought running a stiffer sping in the pullbar would actually light the tires up quicker. Would you explain that to me?

nut3d
Dirt Freak

Total posts: 331
posted April 30, 2004 11:30 AM  
Randy this is Aaron. put a 650 in the LF and a 750 in the RF put 94 shocks on the rear and 76's up front. and get off that alkey and go to gas when you can. I still rember the problems u had with your carb back in Nov. and also are you goin to ba at shouthern this weekend if we don't rain out???????? if so i'll try to help u out some on the handling.

[This message has been edited by nut3d (edited April 30, 2004).]

racer18d
Dirt Roller

Total posts: 14
posted May 01, 2004 06:35 AM  
Thanks Aaron, I want be able to make it this week because my job has kept me too busy to work on my car and when I am the only one there is to do it I have to wait until the time is available. Being self employed, If I don't work I don't get paid and I would much rather make it than spend it!Ha!Thanks again.Randy

nut3d
Dirt Freak

Total posts: 331
posted May 01, 2004 11:02 AM  
I hear were ya coming from randy. I'm bout to have to call it guits till next season in a few weeks.

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