EP 914-6 How low can I go? Options

[neilca]

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I am setting up an EP 914-6 for SCCA regionals. I have 22mm front torsion bars and 350# springs in the rear. How low can I set the ride height? I have found the bolts that hold in the front sub frame to be the lowest point of the car and I can adjust the bars till it hits the ground. The rear I use the jack points on the back corners of the tub. I can lower these down to 2" off the ground.

I have a set of the 23mm front bars also and can get heavier rear springs if needed. Any suggestions? I am runing cantilevered slicks from Goodyear.

I will be running tracks like Road Atlanta, Barber, Roebling and CMP. How low can I go?

Thanks,
neilca.

[neilca]

I have set the ride height. I decided the rules dictate how low to set the car. I put a rim on the LF corner with no tire, simulating a flat tire condition. Lowered the car to the ground and set the ride height such that the lowest point was 1/2" off the ground. Put the regular tire back on and measured 2 3/4" from the jack nub ( this is the boss on the bottom of the tub in the four corners). I then set the rear to 3 3/4" in the rear to give the car some wedge for down force.

Now on to corner balancing, see post on the subject.

[stownsen914]

Raising the rear pickups would solve multiple problems:
Shock travel would increase;
Trailing arm would have more clearance to the underside of the chassis;
Less spacers needed to get desired camber;
Lower rear roll center.

Chris - from some playing I've done using the susprog suspension design tool, raising the rear pickup points raises rear roll center. You have found differently? Of course, you get other benefits by raising pickup points by bringing the arm closer to its intended range of motion ...

CG vs. Roll Center: THE GREAT QUESTION, from what I have experienced, the Roll Center is the more important issue and the LOW roll center will continue to give you handling problems.....

Usually a low roll center is considered desirable. You still have to balance it with other parameters of course. Have you had positive experience in aiming for high roll centers?


Neil - great looking car. I remember seeing the spread over on Pelican a while back.

Scott