WHo has 300whp and what do you have

wstar

Here's a calculator, play with the numbers yourself. Between two dyno runs at the same location many months apart (different seasons), this calculator claimed that conditions accounted for a ~15hp difference in my car's dyno runs:

Dyno Correction Factor Calculator

Then you add in the fact that different dyno brands use different physics methods for measuring torque, some dyno charts use SAE correction and some don't, some mfgs are just known to read higher or lower, some dyno shops adjust their machines higher or lower, or simply fail to calibrate regularly at all and just let it drift over time.... I could go on.

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