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What jetting changes does M5 require?

This fuel seems to be very friendly in jetting. Steve Petty dynoed a 1000 rear wheel Hp vehicle and increased the jetting 15% and the car made 1080 to the tire. He reduced the jetting to 7% and the car went 1079 to the tire. This is an 8% tuning window. I recommend you jet up 10 to 12% to start and then you can back down from there. Al Brown (Antron's father) did a back to back test with M5 vs. M1. His combination is a 540 ci injected big block Chevy running Top Dragster. With no difference in jetting, the car picked up .11 seconds and 6 mph. Again, every combination is different and you'll need to run the tests to determine what your combination likes.

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