Normally 'Fastest possible, but maintain chipset timing' gives you the best results if you want smoothness. Like I said earlier, it pretty much seems as if Stunt Car Racer limits the framerate itself, so a faster processor wont help. That is also the reason why it flickers and drops frames with JIT enabled.
However you might try 'Adjustable between CPU and chipset' to get 14 or 25 Mhz, but I don't know if that is exact or depends on your system.
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