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Dynojet Dynamometer Specifications

The Model 248 dyno is made for vehicles that are around 3000 lb.  Vehicles between 2000 lb. and 4000 lb. will work fine, but keep in mind that the different final gearing will cause the lighter vehicles to work harder getting the engine through the rpm band, and the results may therefore be slightly inaccurate because the engines will not be loaded as they are in the real world.  A good analogy is that the lighter vehicles will act as if they are accelerating up a hill, and the heavier vehicles will be going down.  The greater the difference from 3000 lb., the steeper the slope.  However, the beauty of the Dynojet is that all vehicles are loaded exactly the same, so comparisons between different vehicles will always be valid and repeatable.

 

Dynojet does not recommend putting vehicles that are less than 2000 lb. on this dyno.  Of course, lighter vehicles can compensate for the difference by performing the tests in the lower gears only, but you will still be using a machine that is not designed for your vehicle, and you will be using it at your own risk.  Of course, I have performed many dyno tests on vehicles that weigh far less than 2000 lb., even on some that weigh as little as 1100 lb that are powered by motorcycle engines.  The test results were exactly what the owners expected and were perfectly repeatable, so whatever error may exist appears to be inconsequential.  I have also tested many full-size trucks and even some motorcycles with the same results.  One of the motorcycles was then tested on a motorcycle dyno, and the difference was only 2 - 3 hp.  Unfortunately, I will not be testing any more motorcycles on this dyno - it just makes me too uncomfortable.

If you would like your AWD vehicle tested, it must have a wheelbase between 95" - 114".

The following information copied from DYNOJET.COM

Dynojet Research, Inc. MODEL 248:

Maximum Horsepower 1200hp (2400hp AWD)
Maximum Speed 200MPH (322Kph)
Drums 2
Wheelbase Minimum 95"
Wheelbase Maximum 114"
   

DIMENSIONS:

Drum Diameter 48 Inches
Drum Width 26 Inches
Minimum Axle Width 29.5
Maximum Axle Width 81.5
Maximum Axle Weight 3000
   

GENERAL:

Calibration none, factory calibrated
Power Requirements 110v / 240v
Air Requirements 60 psi minimum
Operating Temp Range 32 to 158 degrees F
   

HARDWARE (dyno control electronics):

Timing Accuracy +/-1 microsecond
Drum Speed Accuracy +/-1/100th MPH
RPM Accuracy +/-1/10th RPM