3-wheel motion! (road course tech)

[jfranci3]

So, this weekend at Grattan I started lifting the inside rear wheel of the car. My friend says it was a good few inches off the ground. Mostly while braking and entering corners. I should have some video later.


Here's what I have on the car:
Rear:
MM TQ Arm
Conventional springs (390-430lb/in)
Bilstein HD shocks
MM PHB
MM non-adj std lower control arms
Stock drive shaft
3.73 Ford gears
Torsen t2

Front:
MM Coilovers
375lb/in springs
Bilstein Struts
CC plates

Chassis
MM subs
Bolt in cage
Nitto NT01s

What's changed on the car:
I've added a MM Tq Arm, conventional springs for it, bolt in cage, and new r-comps.

I think the cause is one of things. 1) Too much rear bar (unlikely, but easy to test). 2) LCA arm binding. 3) Exhaust interference. Anything else I should check for? Any idea how I can diagnose it other than jacking up one side of the axle at a time?

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[PETSNKE]

I've seen someone at Autobahn last year remove their rear sway bar to cure this problem, but he didn't the torque arm set-up you do. He was going to replace it with a V6 sway bar, when I ran into him a couple months later he still was running the car without one.

Like you said, that one is easy to test.

 

[jfranci3]

Also, Someone with a comparable car to mine ran a 1:31 to my 1:35 at Grattan. I suck. Worst of all, I didn't know of anywhere specific where I could make 4 seconds of improvement. I need some sort of data tool to tell me where I suck compared to the other guy.

 

[[email protected]]

If you're trailbraking through the turn it's desirable for the inside rear to unload. You just barely want the inside rear to lift up though, not the 3 inches that you're seeing. If nothing is interfering with the suspension travel you might need to play with spring rates.

My boss offers driving lessons out at the Joliet Autobahn if you're interested (he's one of the founding members). He'll be able to show you how to get the most out of your car. Give us a call at (815) 726-3838 if you have any questions.

 

[jfranci3]

NO Lifting pics yet.

 

[[email protected]]

Looks like you have quite a bit of body roll. You might want to go to a higher spring rate on all four corners. Also what kind of swaybars do you have?