chassis dyno

Run to Rund · 03-12-2010, 01:33 PM

I have personally done over 1000 runs on a Dynojet ( up to 800 HP at the wheels) and learned about them from a man who did some of the development with Dynojet and has about a half million runs under his belt. Mike gave some good info. The single roller type, big diameter roller are best especially for slicks. the double roller type are very hard on any tire. Dynojets with the 48" diameter drum are available with different units (slugs) of intertia. Perhaps the most common simulates a 4500 lb. vehicle. 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. Once being sure to keep engine temp, fuel temp, etc. under control, I have found the Dynojet reproducible within about 2 HP run after run.

03-12-2010, 01:33 PM	#13
Run to Rund Senior Member Join Date: Sep 2007 Location: Henderson, NV Posts: 583 Likes: 8 Liked 54 Times in 27 Posts	Re: chassis dyno I have personally done over 1000 runs on a Dynojet ( up to 800 HP at the wheels) and learned about them from a man who did some of the development with Dynojet and has about a half million runs under his belt. Mike gave some good info. The single roller type, big diameter roller are best especially for slicks. the double roller type are very hard on any tire. Dynojets with the 48" diameter drum are available with different units (slugs) of intertia. Perhaps the most common simulates a 4500 lb. vehicle. 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. Once being sure to keep engine temp, fuel temp, etc. under control, I have found the Dynojet reproducible within about 2 HP run after run.