chassis dyno

[Ed Wright]

Originally Posted by Run to Rund

I have found NO difference from tire diameter or rear gearing. HP is defined as the rate of doing work and is therefore measured directly by an inertia dyno. You change (multiply) torque with gears, etc. but not HP.

I have used mine almost daily for over ten years now, and have had several repeat customers put lower gears in their cars and always show less hp than before the gear change. Every shop I work with has observed the same thing. I don't know about other brands, but it is common knowlege with Dynojet owners. 9 Ford rears always show a loss, as do Dana 60s, compared to 12 bolt GM rears, in the same car with no other changes.