Quote:
Originally Posted by dragoontwo
For the roll center, what is lowered enough in your opinion?
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There are hard numbers for all this, but I'm just an electrical engineer and play with security systems, not CAD and geometry. it's not that hard tho.
essentially, look at the angle of the control arm inner pivot to the pivot in the ball joint. if that is past horizontal and pointing "up" from inside to outside, then you have roll center problems. with most street cars, that's roughly around 1-1.5" lower than stock, but I've never actually done the measurements and maths on a Twin. it's likely that some of the more academic racers have done it.
I just knew my car handled like crapola and was understeering with tire wear issues and I couldn't get enough camber in the car to reduce the front wear. Sooo I put on a set of SPL arms with roll correction about the same vertical offset as my lowering, then reset the bumpsteer. next race I went 2 seconds faster on the same track and had WAY better turn in response and tire wear.
can't help with much more specifics than that cause it was 2 yrs ago.