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Author Topic:   forward bite on imca stock car
wingnut
Dirt Full Roller

Total posts: 70
posted July 02, 2002 11:14 PM
i know that this has been discussed here before,but some of the ideas are not legal in the imca cars,ie: moving mounts,etc.
if anyone has any ideas on what can be done to try to maximize forward bite on this type of car,i would thank you for your ideas and help.

istock59
Dirt Freak

Total posts: 237
posted July 03, 2002 09:23 AM
Soft(er) rear springs, as long as the track isn't rough. Bottoming the suspension is worse than been too stiffly sprung.

Easy-up front shocks, in combination with tie-down rear shocks. Personally I prefer Bilsteins.

And a new RR tire about every 4th race or so...

SLEEPY GOMEZ
Dirt Maniac

Total posts: 199
posted July 14, 2002 09:17 PM
Hi Wingnut, try this. Use 175 rr spring and a 200 lr. Then use your weight jacks to raise the car so the lower trailing arms run slightly up hill at the front. If you have a 9" rear the chassis will usually measure 7 1/2" to 8" from the ground to a point where the side rail welds to the bent part of the chassis. If anyone knows the name for this poistion please let me know.

Turn down on the lr jack ***** enough (add cross weight) to take out any tendency for the car to push going in. This should be a close setup.

#37DG
Dirt Roller

Total posts: 10
posted July 15, 2002 10:42 PM
quote:
Originally posted by SLEEPY GOMEZ:
Hi Wingnut, try this. Use 175 rr spring and a 200 lr. Then use your weight jacks to raise the car so the lower trailing arms run slightly up hill at the front. If you have a 9" rear the chassis will usually measure 7 1/2" to 8" from the ground to a point where the side rail welds to the bent part of the chassis. If anyone knows the name for this poistion please let me know.

Turn down on the lr jack ***** enough (add cross weight) to take out any tendency for the car to push going in. This should be a close setup.


Move weight as high as you can get it. raising the rollcenter of these type of cars is the key. Imagine if you had a telephone poll on pointing straight up off the roof of your car. At the end of this pole there is 200 pounds or so. When you stand on the gas the momentum of the weight will transfer the weight to the rear of your car. The higher the weight is the more of a lever arm it has on your car to transfer to the rear wheels. I have 200 pounds above my head. Also you need to make sure the ride height is high in the back with your lower trialing arms faceing up hill. The reason for this is because it causes rear steer. When your car enters the corner the the weigth shifts to the right rear side. Your right trailing arms moves from the position of facing uphill to the position of being horizontal to the ground. This makes the wheel base on the right side of the car longer then the left side. This allows you to tighten the car up more because the rollover affect loosens the car. And it gets better. When you are exiting the corner the trailing arms are returning to there original position so it makes the car more and more tighter while you are exiting under throttle. The key to all this working together is a large spring split in the back, at least 50#, trailing arms pointing uphill, and moving your rear weight as high as possible.

Dan

o5racer
Dirt Maniac

Total posts: 115
posted July 16, 2002 10:21 PM
Not trying to be picky here, but moving weight up or down will change the center of gravity. not the roll center. roll center is controled by the suspention mounting points. but other than that it sounds good.

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