TURBO TUNING-PUMP GAS VS RACE GAS Full Dyno Results

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Turbo tuning. How much power is lost having to run a pump-gas tune on your junkyard turbo LS? 91-octane, pump gas requires less ignition timing than race gas or E85. The lower ignition timing has a dramatic effect on power. Check out the difference in power when I compared a pump-gas tune with 12 degrees of timing to a race gas (E85) tune with 20 degrees of timing on a turbo 4.8L. I also ran multiple timing levels in between (14, 16 and 18 degrees). Why didn't the A/F change?

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