Quote:
Originally Posted by mike@x-ph.com
Dynos are not meant to be used for absolute power. Some read high, others read low. The car makes the same power no matter what the dyno is showing.
Its used to compare delta between stock and once mods are installed
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I'll also note that Dynojets are by far the most consistent in terms of the way power is measured as it's such a simple power measuring device. It's simply a free spinning weighted drum, an RPM pickup on a coil pack, and a full throttle timed run. From there, the power numbers are calculated from how quickly the tires spin the drum over the time of the run. Crazy simple and repeatable.
They are not the best dynos for tuning as you can't vary load on the drum (i.e., Mustang dyno and the like), but when it comes to "the numbers" they are extremely consistent and within 2% to 3% of the same model car dynoed on a Dynojet in CA vs one dynoed on a Dynojet in NY assuming the same correction factor standards are used and the car is in a good state of tune and not super heat soaked.
It's also nearly impossible to manipulate the data on a Dynojet. You could make wild changes to the correction factors but it would be very obvious that you're doing that.
When it comes to companies showing power gains for mods, a Dynojet is the best tool for the job, IMO.
For tuning, a load-based, brake style dyno is the only way to go.