CLASS RACER FORUM - View Single Post - Percentage diff between a Chassis Dyno and an Engine Dyno

Mike Taylor 3601 · 04-05-2011, 02:26 PM

Only thing I can tell you is my car lost 28% on chassis dyno.It was automatic then. Dynoed engine on superflow SF900AT It was calibrated as close as possible,air corrected to 29.9 baro 60 degrees. Then later we got a Dyno jet chassis so my car used to test it lost
28%.
As Ed said don't compare your # to others,just look at gains from where you started.
I don't know about others but dyno jet has setting where you let car coast after pull and it calculates driveline drag or % of loss I can't remember term they use.
I don't have much chassis dyno experience but in my opinion they probaly not as repeatable as good engine dyno.
Mike Taylor 3601

04-05-2011, 02:26 PM	#4
Mike Taylor 3601 VIP Member Join Date: Oct 2008 Location: Somerset,Ky Posts: 1,372 Likes: 355 Liked 308 Times in 103 Posts	Re: Percentage diff between a Chassis Dyno and an Engine Dyn Only thing I can tell you is my car lost 28% on chassis dyno.It was automatic then. Dynoed engine on superflow SF900AT It was calibrated as close as possible,air corrected to 29.9 baro 60 degrees. Then later we got a Dyno jet chassis so my car used to test it lost 28%. As Ed said don't compare your # to others,just look at gains from where you started. I don't know about others but dyno jet has setting where you let car coast after pull and it calculates driveline drag or % of loss I can't remember term they use. I don't have much chassis dyno experience but in my opinion they probaly not as repeatable as good engine dyno. Mike Taylor 3601