John_Heard wrote:
I have a leaf spring stock suspension car, so it's a bit tough to try on mine.
John, achieving equal rear tire loading is a problem with both leaf spring cars and ladder bar cars. But, it can be done. The asymmetry has to be at the front of the car, however.
With adjustable coilovers at the front, a higher rate spring can be used at the right front than at the left front. That's a higher RATE. There's not going to be any static preload. The adjustability will be used to bring the car back to equal rear tire loading as it sits. It's going to take more than a few minutes of fiddling with those coilovers before the bumpers are level, the ride heights are where you want them, and the rear tires are equally loaded, but it CAN be done.
With a higher rate spring on the right front, most of the weight transfer will be pulled on the right side. (If you have trouble with that, think of what would happen if the right front were solid. The left front coil wouldn't be changing in length, so all the weight transfer would be coming from the right front.) Since the sum of right front and right rear must always remain a constant (or the car would be rolling over), that means...with the proper left front and right front spring rates...it would be possible to have equal rear tire loading during launch (and, of course, throughout the run).
Since most of you have buddies who are oval racers, you're familiar with some of the crazy spring combinations they use. You might, then, prefer working with this rather than an asymmetric adjustment on your 4link. The results are the same.
There's a spreadsheet for this somewhere on my site. Can't remember the page.
http://www.racetec.cc/shope