"Real world" dyno tests

[Captain Redbeard]

Hey all, we are trying to setup a "real-world" dyno test profile and I am having trouble figuring out the calculations needed to dynamically update the load on the engine as if the car were doing an accel run. I know it will involve the weight of the car, final drive ratio, rolling resistance, drag and so forth but I haven't been able to find the calculations. I know the DYNOmite systems have an option for this built in but our system doesn't. Anyone have any insight on this or know where I can look for some answers? Thanks!

-Redbeard

[Captain Redbeard]

Hey all, we are trying to setup a "real-world" dyno test profile and I am having trouble figuring out the calculations needed to dynamically update the load on the engine as if the car were doing an accel run. I know it will involve the weight of the car, final drive ratio, rolling resistance, drag and so forth but I haven't been able to find the calculations. I know the DYNOmite systems have an option for this built in but our system doesn't. Anyone have any insight on this or know where I can look for some answers? Thanks!

-Redbeard

[murpia]

Usually dyno road load is approximated by an Av2 + Bv + C type equation (try Gillespie for an example?). Inertia simulation depends on the dyno, some have flywheels some do it all electronically.

How are you incorporating gearshifts?

Ian

[Captain Redbeard]

Cool, thanks murpia. Right now I wasn't considering shifts but I suppose we could hook up our hydraulic shifter if we wanted to. Also, we're planning to hook up our new shifter/clutch to test it as well. Thanks for the help.

-Redbeard