Very respectable. From the video, it looked like the car was generally going where you pointed it. Getting the understeer reigned in, especially in a front-heavy and torquey V6 FWD, is tricky business. I know with the VW team I've been helping, that thing corners on rails now with various tweaks to the alignment and suspension. If actually kind of oversteers more often than not. They were having the same problem as you though, the engine kept overheating and breaking things. The car just got back from the ChumpCar Michigan race last month and after replacing headgasket and a few other odds and ends, we think the overheating issues are now solved. Going to do some carb tuning at the autox this weekend.
Anyways, looking forward to more from the Lemon Duster. Great work so far.
It took us a while to get the old P-body setup correctly, but I think we are 99% of the way there. The biggest improvements we made were raising the roll center by way of re-positioning the control arm mounts and lowering the rear of the car.
The weigh distribution isn't ideal, but it also isn't as bad as people would have you believe. We measured 60/40 earlier this year with a dry weight of ~2400 lbs.
We were initially having some problems with the back end locking up and kicking left during heavy braking. We remedied this by replacing the EBC yellow pads with a much less aggressive rear pad and aligning the rear axle. We measured about 3° of thrust angle difference in the rear axle and this was causing the twitchiness of the rear end during braking. The rear brakes now lock up simultaneously with the fronts and the back end doesn't walk out to either side anymore.
The handling is pretty neutral. If anything, it'll over steer before under steer. While this sounds like fun, it can catch new drivers off guard if they aren't prepared.
We are running the same Ebay "race car rate!
" springs on all four corners that came with our el-cheap coil over kit. We ghetto-measured the rates to be somewhere between 450 and 500 lbs. The car really needs between 300 and 350 lbs. max in the front, but new springs aren't in the budget and we are trying to do this as honestly as possible (cheating only when absolutely necessary). For front struts, we picked up a set of second gen Neon adjustable Konis while in the rear we sourced a pair of Rancho RS5000s from a Toyota Tacoma that work perfectly in our significantly lowered travel range. The front still "hops" on the really
rough pavement / asphalt, even on the stiffest Koni settings. Not much we can do about that until we go with softer front springs.
How I raise the roll center
are you allowed to run oil coolers etc? What kind of oil are you using? I don't run expensive stuff but this seems like the event to run more robust oil when it comes to dealing with temperatures.
We did get the judge to look the other way at oil cooler that was sourced from a C7 Corvette's differential cooler. He feels sorry that we keep blowing up, so he cuts a little slack in the engine explosion prevention department...
At the actual race, we run the Mobile-1 15W/50 full synthetic with extra zinc additive. It's the same stuff source for the Z06s and ZR1s, should be good enough for us.