You don't want TEC, you want an intercooler.
the most efficient way to cool your incoming mixture is after you've heated it by compressing it with the turbo - not by cooling already-pretty-cold gasoline.
Are you turbocharging into the crankcase or directly into cylinder? Was this setup originally intended for a turbo or have you added it on? What sort of valving are you using? Ports? Discs? Reeds? (not sure reeds would work with a turbo).
The traditional way to get extra cooling on a two stroke is, of course, to dump more gas through. If you've got anything left in the tank at the end of the race, that's still worth considering. You might even try water of alcohol injection into the plenum...
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