Quote:
Originally Posted by Mkelcy
Thanks for the suggestions.
I've got a nitrogen fill setup on the way. When it gets here, I'll get a bottle from the welding gas store and gas up the rear shocks.
I also heard from David Pozzi who's tuned Bad Penny, which has the same front and rear suspensions I'm using, as well as the One Lap Camaro, which uses the same rear suspension.
David's suggesting I leave the rear spring rates alone for now and drop the front springs to 350 lb./in. He noted that 350 lb./in. springs in the 21st Century Street Machine subframe would be equivalent to a 600 lb./in. spring in a stock subframe, which suggests that the 450 lb./in. springs in there now are the equivalent of a 770 lb./in. spring in a stock subframe. In any event, I'll swap out the front springs, leave the rear alone (other than gassing up the shocks) and see where I am.
I'll consider shocks if I can't get it where I want it any other way, but springs are about $70 a set, and gas charged shocks (which I need because they're mounted upside down) are going to be $400-$1,000 plus a set.
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Don't forget though, while you found the relative difference between the spring rate on a stock subframe vs the 21st Century one, you've sort of calculated one back from the other without thinking about the motion ratio and wheel rate. The 450lb spring might be equivalent to 770lb spring in a stock subframe car, but wheel rates are probably closer to 300 and 200. If you had a 550-700 lb spring on the 21st Century frame I would think it would be way too much for what you're doing.
Part of building a car is spending time after its done to get it sorted out to your liking. Even the finished cars around here always seem to be in pieces. Springs are cheaper than shocks though, so if it works for you then you're lucky you only had to make one change.
