Road Racing Vapor Lock [Archive] - Toyota MR2 Message Board

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Keep vapor locking my car in high ambient temp conditions. Especially when coolant gets really hot. I am having this trouble with my Road race Gen 3 powered 1991 2nd Gen MR2 racecar. We race in the winter months here in Southern Louisiana (because firesuits and 100 deg temps are a recipe for heat stroke), and we also run a summer series for crazy people (like me). Anyway, I had NO problems during the winter and have vapor locked my car 3 times now from this issue. IT