loose from middle off

[modcrewchief]

have a imca mod 4bar 4bar that snaps loose in the middle of the corner on the brake or off and is loose from there out in the dry slick if there is bit in the track the car is fastsprings lf 600, rf 550, lr 200, rr 225bar angles lrt 25 deg at ride height and 45 deg at full droplrb 8 deg at ride heightrrt 18 deg at ride heightrrb -2 deg at ride heightj bar is 7" up on the frame and level with the pinion80lbs lr biteneed help what is wrong with car

[washeduptoo]

Are you running the rear end squared up or are you trailing the rr any? Even it up will help, best of luck.

[modcrewchief]

The re is not trailed it is about a 1/4" ahead

[washeduptoo]

Have you tried dropping lrt bar on b/c to see if that helps or lowering lrb bar on chassis?

[modcrewchief]

Have not tried to index the bird cage and already dropped the lab one hole.

[Confused?]

"The re is not trailed it is about a 1/4" ahead "

Are you saying the RR is leading? If so, square the rearend up or trail the RR an 1/8"

[washeduptoo]

Confused? do you think going up in the rf spring might help in this situation? Thanks

[Confused?]

It could, but i would bet the car is too tight on entry and thru the center. The driver is having to wait to pick up the thottle. The exit is the last place I would try to change. This could/would create a tight/loose condition. The front tires have lost traction, compared to the rears, and when the car slows down enough, it snaps loose. At that point, the fronts grip more than the rears.

The RRL bar having a negative angle is something else I would want to change. Without watching the car or having all of the information, it's very difficult to nail down the problem(s).


To the OP:

Does the RR want to stand up after the apex? Does the car stay rolled over thru the corner?

[modcrewchief]

No the rr does not try to stand up but the car does seem to roll on to the right side and stay there. Could the j bar be to high and cause this

[beaver396]

If its tight on entry, then it sounds like you are using to much brake to make it turn and then the car falls off the bars, it should turn with the steering wheel. square the rear end. higher compression LR shock with alot of gas pressure to help keep the car up. if you have to slide the rear wheels to make it turn then loosen entry.

[Confused?]

I would square the rear end and raise the RL bar to about 4* This will help the entry by reducing some of the indexing and add a little roll steer to the right side.

[mod71m]

I agree with confused. Start by squaring the rear end up or trailing it a little and also raise the right lower bar one hole (or whatever it takes to get 0 to 2 deg uphill to chassis).

Then if the car is still tight on entry and loose on exit go up 50 lbs on the RF spring. If entry is fine but exit is still loose/no traction then drop the right upper bar one hole.

Also where is your pull bar located left to right in relation to the drive shaft? Do you have a centered rear end or offset pinion?

[modcrewchief]

Drive shaft is centered

[mod71m]

The drive shaft is but is the pull bar directly above the drive shaft or is it to the left or right of it?

[modcrewchief]

It is directly above the drive shaft

[mod71m]

Move it 1/2" to 3/4" to the left on both the frame and rear end side from where you are. For a heavy track you are ok. The pullbar should be slightly left of center for the slick.