Quote:
Originally Posted by Cobra #3170
The cam was optimized for EFI because that was what I was going to run. We just put a carb. on it to see how the two compared. We tried varying the injection timing in relation to cam timing with different sized injectors too. I think if the nozzles were further up stream in the intake runners it might have helped but packaging would have been an issue. One thing we found was that retarding the ignition above 7000 helped with the EFI. We did not try this with the carb. because the main effort was to get the EFI right. We made so many dyno runs the engine had to be freshened with new rings when we got done.
I was really surprised at the results because several years ago we tried the same experiment on a milder engine and it was 20 hp better with EFI. That engine was in the low 700's @ 6700.
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Interesting, what are your thoughts as to why retarding the ignition above 7000 RPM helped the power output with EFI? How much retard did you use?