Torsion bar car - how low is too low?
02-01-2010, 01:22 PM
#17
Great picture Bill.
Should note that there seem to be two types of things folks call bump steer kits at times.
Steering rack spacers... these move the rack up. They help things some in the front, the amount depends on how much the car is lowered and the specific geometry of the suspension.
The other type of kit is made by ERP (Eisenlohr Racing Products... sold by JWE/SmartRacing products). If you can learn about set up from Eisenlohr, you are tapped into the old school. There is also a version sold by Rebel Racing I think, and Elephant Racing... and perhaps others. These kits allow the tie rod to be attached to the strut with improved geometry such that there is less alignment change for change in ride height (bump and rebound).
I don't think that these kits are designed to fully restore the steering arm to horizontal. That would only be true for a specific suspension geometry. I think they are designed to provide improvement in the geometry.
The Puhn book explains all of that. And since these cars where raced for a long time in IMSA, there are plenty of folks out there that know how to set them up, likely even given the class-based constraints to which you have referred.
Should note that there seem to be two types of things folks call bump steer kits at times.
Steering rack spacers... these move the rack up. They help things some in the front, the amount depends on how much the car is lowered and the specific geometry of the suspension.
The other type of kit is made by ERP (Eisenlohr Racing Products... sold by JWE/SmartRacing products). If you can learn about set up from Eisenlohr, you are tapped into the old school. There is also a version sold by Rebel Racing I think, and Elephant Racing... and perhaps others. These kits allow the tie rod to be attached to the strut with improved geometry such that there is less alignment change for change in ride height (bump and rebound).
I don't think that these kits are designed to fully restore the steering arm to horizontal. That would only be true for a specific suspension geometry. I think they are designed to provide improvement in the geometry.
The Puhn book explains all of that. And since these cars where raced for a long time in IMSA, there are plenty of folks out there that know how to set them up, likely even given the class-based constraints to which you have referred.
on 964 - 997 they use modified wheel carriers and outer tie rod parts to do the same thing
