if you're getting wheel spin, hang onto the clutch a bit more. launch earlier, like 2nd light, and from the rear of the staging area, that usually reduces times by up to 0.5s (you start accelerating from earlier, meaning your average speed over the quarter is higher). contact patch of your tyre doesnt matter as much as compound, so 20psi seems like you're pushing it a tad. for the weight of a type r, i'd say 25-30psi, depending on the tyre. try to keep steering to a minimal, kill any toe out your car may have. a little camber is alright. etc.
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