Already tuned on 305cc Supra injectors, moving to 550cc RX7 injectors: Some questions
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I'd say, figure out what your current required fuel setting is, and change that number to whatever it would be for a 550. I used 13.2 for my stock injectors on my 99 and when I put my 460's in I use 6.9. I bet if you searched or took a poll of what others who use 550's run for their required fuel, you could find the number. By changin it, it won't give you a perfect tune, you'll still have to VEanalyze your fuel table, but you'll be close.
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