DRIVE SHAFT LOOP PROBLEMS

[gchaser1]

After reading my previous post, I realized the Dufus label applies to me. Doesn't the OEM rear suspension give the rear axle more travel area (up and down) than a stiffer after market suspension?

[Birdman]

Originally Posted by gchaser1

After reading my previous post, I realized the Dufus label applies to me. Doesn't the OEM rear suspension give the rear axle more travel area (up and down) than a stiffer after market suspension?

It will allow more travel of the body down and the axle upwards due to softer springs. It will also allow the axle to come closer to the rear DS loop when unloaded such as when under hard braking because the OEM suspension already positions the rear axle in a lower position ( in relation to the loop which is attached to the undercarrage) which brings it much closer to the bottom of rear loop to begin with.

Summary: Higher suspension more likely to hit rear DS loop while driving and braking hard.

On a lift where suspension hangs all rear loops will hit.IMO

[Alloy Dave]

Originally Posted by gchaser1

After reading my previous post, I realized the Dufus label applies to me. Doesn't the OEM rear suspension give the rear axle more travel area (up and down) than a stiffer after market suspension?

I guess we're getting into semantics here. Since the car is lowered with the aftermarket suspension, then George's statement is correct. However, the total travel of the rear axle is determined by the shocks and control arms, not the springs. In other words, if you were strong enough to lift up on the rear of the car, the bumper would continue to lift without the tires coming off the ground until the shocks were fully extended or the UCA/LCAs were at the limit....it has nothing to do with the springs at that point. What I'm not sure of is whether the fully extended FRPP shocks are shorter than the fully extended original shocks. My guess is that they would be shorter when fully extended, but I'm not sure.

Another way to think of it is this. Take off the LCAs and UCA, then start jacking up the rear bumper. The body will keep lifting while the axle stays on the ground, and the springs will eventually fall out on the ground...there's nothing that holds them in, which is why I say they don't have anything to do with the travel (at least in extension, although they do in compression).

[gr8snkbite]

Originally Posted by Alloy Dave

I guess we're getting into semantics here. Since the car is lowered with the aftermarket suspension, then George's statement is correct. However, the total travel of the rear axle is determined by the shocks and control arms, not the springs. In other words, if you were strong enough to lift up on the rear of the car, the bumper would continue to lift without the tires coming off the ground until the shocks were fully extended or the UCA/LCAs were at the limit....it has nothing to do with the springs at that point. What I'm not sure of is whether the fully extended FRPP shocks are shorter than the fully extended original shocks. My guess is that they would be shorter when fully extended, but I'm not sure.

Another way to think of it is this. Take off the LCAs and UCA, then start jacking up the rear bumper. The body will keep lifting while the axle stays on the ground, and the springs will eventually fall out on the ground...there's nothing that holds them in, which is why I say they don't have anything to do with the travel (at least in extension, although they do in compression).

im sure they are shorter since lowering the body is the goal. i didnt take any side by side shots of them, but maybe someone else did...but yes, i beleive that attributed to mine not hitting while on the lift at Evo.

[frydguy79]

i finally brought my car over this morning to work and rotated my driveshaft 180 on the rear end and 45 deg on the trany and i have almost zero vibration now over 75 thank goodness

i hated the vibration

[gr8snkbite]

good job....

[gchaser1]

I just recently installed the front and rear DS safety loops from BMR with the 3.5" aluminum Dynatech on FRPP suspension. On the first hard launch, the DS rubbed against the top of the rear loop. Still have the stock UCA and the pinion angle is at -3. Probably with a stiffer UCA there wouldn't be a problem, but I like the quietness of the OEM UCA and LCA's.

[TOMMY GUN]

Mine doesn't hit, but I hace the J&M UCA.

I don't notice any noise from it.


.

[gr8snkbite]

Originally Posted by gchaser1

I just recently installed the front and rear DS safety loops from BMR with the 3.5" aluminum Dynatech on FRPP suspension. On the first hard launch, the DS rubbed against the top of the rear loop. Still have the stock UCA and the pinion angle is at -3. Probably with a stiffer UCA there wouldn't be a problem, but I like the quietness of the OEM UCA and LCA's.

if the cars lowered i.e. frpp suspension...you need the adj UCA to properly set pinion angle. -3 isnt bad but its at the high end. should not be hitting the top of the loop at all. quietness has nothing to do with the uca..its about proper angle and no wheel hop..J&M's UCA a great piece...i have it..

[JTB]

Originally Posted by gchaser1

I just recently installed the front and rear DS safety loops from BMR with the 3.5" aluminum Dynatech on FRPP suspension. On the first hard launch, the DS rubbed against the top of the rear loop. Still have the stock UCA and the pinion angle is at -3. Probably with a stiffer UCA there wouldn't be a problem, but I like the quietness of the OEM UCA and LCA's.

I have the Steeda ADJ UCA and the Billet LCA and they are not audible at all from inside the cabin of the car and their performance is beyond my expectations, the rear end of the car is much more sorted and predictable especially at launch.