[dcook_14]

Originally Posted by ReverendDexter My understanding is that the torque arm setup grips HARD for launching due to the instant center it provides. However if you're just doing drag racing, the additional cost over adjustable uppers and lowers probably isn't worth it for the gains you would see. The adjustable upppers and lowers will also allow you to change your setup based on the track condition.

I know that I can't have both great cornering and great straight line, but would this setup allow me to have a nice drag car that could also corner decently? I probably won't do any autocross, but I love driving hard on the twisty roads around here, and I don't want to lose that...

Originally Posted by ReverendDexter Depends on what part's adjustable. Usually adjustable LCAs allow you to adjust the height of the spring perch, which would be totally unnecessary with coilovers. Adjustable UCAs are usually adjustable length, which allows you to dial in your pinion angle, which I understand to be HUGE in terms of launch grip.

I've heard the opposite, that pinion angle doesn't really have anything to do with traction. If I understand correctly, pinion angle is just the angle between the differntial and the driveshaft. If it's off quite a bit, then it will rob horsepower. But as far as traction is concerned it doesn't make a difference what angle that u-joint is at. Anyone to confirm or deny?

How would you adjust the pinion angle if you don't have adjustable UCAs? Say if I go to a panhard bar/torque arm setup and got rid of my UCAs alltogether?

Originally Posted by ReverendDexter One thing I will add here is that if you go the 4-link route, make sure to get UCAs with spherical joints, not the kind with poly bushings. Polys are okay in the LCAs, though having a spherical joint on at least one side is definitely preferable.

I've heard this before and will make sure to get the spherical joints

[ModMustang97GT]

As far as cost goes, a nice 4 link set up will be cheaper. And it will not be any worse than it already is at cornering. If you want to take it a step further, the best suspension for both drag and turning is the 3 link for a non-irs.

The torque arm allows you to set the pinion angle to be nothing. Your stock 4 link set up is expecting axle wrap, so the pinion angle is set off so that the axle twists and the angle becomes correct.

If you are confused on the pinion angle effect. Take a socket wrench with a universal on the end, twist it straight on and twist it at an angle. It works, but you are losing a lot of mechanical advantage at an angle.

The torque arm is the bar none best option. But it costs a bit.
Rear coil overs make an adjustable LCA meaningless. (adjustable spring perches that is, not length)

[ferk]

hey hi to all a very nice post and good information given.