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Ebay or try the Track Time Facebook page to see if anyone has some.
The Mini Challenge cars use Dunlop 185/580R15
Or Michelin equivalent size will be 19/57-15
What are the tyre regs for your series?
I was there a few weeks ago with a forged Megane that made 430bhp.
Chris spent over 4 hours getting it spot on and he explained various things and showing us calculations of what he'd expect at a given boost pressure.
I think we've established that the failure on his car wasn't anything to do with mapping.
@Allan H i'd have 100% confidence in taking it to EFI. Everytime i go, Chris has always had time to talk to anyone and explain things as he does it.