Does anyone have an educated guess, as to WHY these two dyno's are so far apart on the #'s???.
I simply do not understand the reasoning behind the differences..........
Inertia dyno- calculates torque based on how quickly the vehicle can accelerate the given (constant) mass of the drums.
Brake/load dyno - calculates torque based on how quickly the vehicle can accelerate a simulated (computer controlled - not necessarily constant) load. Load in this case is the "mass" and can be simulated using oil, water, friction brake, etc. to slow the acceleration of the drums.
Originally posted by Lambinator Brake/load dyno - calculates torque based on how quickly the vehicle can accelerate a simulated (computer controlled - not necessarily constant) load. Load in this case is the "mass" and can be simulated using oil, water, friction brake, etc. to slow the acceleration of the drums.
A true brake dyno measures how much constant torque is being applied on the dyno drum at a constant engine (and hence drum) RPM.
An inertia dyno also measures torque by back calculating how much torque it takes to spin up the known mass inertia. Inertia dynos with higher mass drums are probably more accurate because it takes longer for a given amount of power to spin them up, and hence the data aquisition does not have to be as fast to get accurate "instantaneous" slices of data.
Originally posted by ZO6LS6 Does anyone have an educated guess, as to WHY these two dyno's are so far apart on the #'s???.
I simply do not understand the reasoning behind the differences..........
I guess I am ignorant but I have know idea what a mustang dyno is I have a mustang and the dyno I use is a dynojet so I have no clue about the differences.
I guess I am ignorant but I have know idea what a mustang dyno is I have a mustang and the dyno I use is a dynojet so I have no clue about the differences.
sg
They invented the Mustang dyno just to dyno Mustangs with ... that's why they always show more HP than there really is. (j/k)
Originally posted by Lambinator Also, I was under the impression that the Mustang isn't a "true" brake dyno as it relies somewhat on being a hybrid of the two types.
I'm not familiar with the Mustang dyno, but you could be right on the hybrid comment. I know a true brake dyno will actually hold a constant brake force long enough to obtain a HP reading at a constant engine RPM, then step upto the next hold speed.
An engine develops maximum power at maximum load.
The brake dyno applies max load.
The inertia dyno does not apply max load to allow it to
spin up.
-Len
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(j/k) 
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