Buick Regal vs 02 Viper GTS
#201
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I've actually been on that dyno when they were having tach problems and the horsepower was still right on.
It's the torque reading that is effected with tach signal issues... because the torque is calculated based on horsepower and engine RPM.
#203
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But the horsepower is 100% accurate. It has absolutely positively nothing to do with engine RPM.