Lift Bar location on Rear-end

[racefastnow]

How does the location of the lift bar where is mounts on the rear-end effect the car. The location form front to back. I noticed some cars the heims mount closer to the center when looking from the side view. We have ours like 4 inches forward when looking from side view.

[hucktyson]

It has zero effect , the rear end can't tell where that's bolted on. Moving it side to side would probably create more loading on the tire you move it closer to but front to back means nothing

[rakracing]

I questioned mark bush on that and was told left to right on rear or front to back on rear does nothing, where it attaches to frame front to back and left to right mean everything, and of coarse I had to try it anyway and found no advantage.

[billetbirdcage]

I questioned mark bush on that and was told left to right on rear or front to back on rear does nothing, where it attaches to frame front to back and left to right mean everything, and of coarse I had to try it anyway and found no advantage.

I think you misunderstood Mark or least I wouldn't think he'd say that, as left to right on the rear end will have a large effect on the left vs right tire load coming from the torque arm. Yes front to rear on the rear end isn't going to effect anything, but left to right on the rear end sure will.

[rakracing]

billet I asked him left to right on rear and was told by him and mark Richards it makes no difference , I asked because I run a grt and they had a lift bar that mounted on the left side bell , was going to try it but they talked me out of it

[racer2e]

Billet, are you saying that if the 5th coil stays in the exact same place, but the lift bar heims are moved left to right on the rearend, it will change the handling?

[MasterSbilt_Racer]

Billet, are you saying that if the 5th coil stays in the exact same place, but the lift bar heims are moved left to right on the rearend, it will change the handling?

I will answer for Billet. The answer is yes!

[fwdbite]

Boy i would think front ti back would have an effect also, just thinking of leverage point.

[MasterSbilt_Racer]

Boy i would think front ti back would have an effect also, just thinking of leverage point.

It only matters if it changes the distance from the axle of the 5th coil. If you keep that the same, attachment point on rear, front to back, doesn't matter.

[racer2e]

I am no expert, but my contention is that the side to side does not matter either. I believe that if you draw a line from the 5th coil back to the rearend that is perpendicular to the rearend, that is the point where the force is felt.

[rakracing]

I asked this question at the racewise school during class and they through testing found no advantage, if it worked we'd all be running the grt left mount torque arm, where it mounts to frame means alot

[billetbirdcage]

I am no expert, but my contention is that the side to side does not matter either. I believe that if you draw a line from the 5th coil back to the rearend that is perpendicular to the rearend, that is the point where the force is felt.

I know this argument well and understand the principle behind that theory.

However the many times I've tested it with different drivers, They always got a reaction to the way it drives off the corner.

[billetbirdcage]

I asked this question at the racewise school during class and they through testing found no advantage, if it worked we'd all be running the grt left mount torque arm, where it mounts to frame means alot

I know the left side TA you're talking about, while I never tried it myself but several people that supposedly tried it told me it made the car "Not turn in a 40 acre field". (Never tried it as in that particular arm or moving one that far to the left)

Billet Shrugs

[MasterSbilt_Racer]

It is pretty simple. The rear "feels" the forces where the torque arm is applied. Move it far enough left, and it is a clamp bracket for a clamped lr that just happens to lift on the car closer to the CG.

[MasterSbilt_Racer]

Or, draw a free body diagram for a torque arm when the car is in the gas. The rear applies torque at the attachment point to the rear. This is counteracted by the 5th coil. Now, all moments are balanced. However, we have a downward force vector at the 5th coil attachment, but no upward force vector to cancel it out. That missing vector is at the center of the rotation. It is the rear end resisting being forced downward into space.

When you then move on to do a free body diagram of the rear, the location of that point certainly matters.