Well, the most recent fasttrack brought the weight down to 2050lbs! I think the car CAN be competitive at that weight. I WAS building one until I lost my storage space and now am being forced to sell it. As far as spring rates go, these things have almost the exact same suspension design as the AE86 Corollas, so use a racing setup from one of them as the starting point. I dont remember the specs off the top of my head, but you can find them on www.club4ag.com. Also, I would recommend heading over to www.toyota3tc.com for info about these cars. The 3TC motor is bulletproof and the stock hp rating of 75 shouldnt scare you. They came from the factory with an UBER restrictive carb and exhaust system. Just going to the weber carb, removing the smog junk, and doing the header/racing exhaust should net you significant gains in power (25-30, as I have heard). Anyway, hope this info helps.