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Thursday, July 16, 2020

Engine Dyno vs Chassis Dyno : What are the power differences?

Engine Dyno vs Chassis Dyno : What are the power differences?
Engine Dyno vs Chassis Dyno : What are the power differences?

Richard Holdener has one of our favorite YouTube channels. He does tons of testing, between tons of different engines, cars, turbos, superchargers, and the rest.  He has been involved in the industry a long time, done lots of dyno testing, and written many magazine articles. 



In this video from Richard, he runs a few different engine combinations on the engine dyno, and on the chassis dyno. 


The fixed percentage for loss, has been something we have thought a lot about. How can it really be a fixed percentage? It has to be some amount, plus some variable amount of loss due to increased loads.  The numbers can be manipulated, depending on what direction you want to go. That is if you start with engine power and work backwards, or start at wheel power and go to the engine. 

 

We have run the same engine on a engine dyno, and on a chassis dyno. When we were racing the Nissan Skyline GT-R, R34 in World Challenge GT, Nismo assembled an engine for us. This hand crafted Super Taikyu engine, made 472 horsepower at 1.1 bar of boost on Nismos dyno in Japan.  On a Dynojet dyno in the US, the car did 450 wheel horsepower (rear wheel drive) at 1.8 bar of boost peak.  This was on small N1 sports turbos.

Filming R32 GT-R for Top Gear America. Super Taikyu R34 GT-R


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