Whats the difference in different dyno's?
 

I've noticed that people say that different machines will give you different results. So what i want to know, roughly how much hp differences is there in all the different US style dyno's? I've used a Mustang Dynamometer, and a Dyno Jet Model 248H? On the mustang i put down 167rwhp in my n/a FC, and 234rwhp on my FD (With down pipe, and RB inlet duct.). On the Dyno Jet i put down 250rwhp in a peripheral 13B, and 182 rwhp on a very largestreet ported 6 port engine. Someone please shed some light on the subject for me. Later, CJ

come on....someone has to know the difference. I just would like the difference in overall hp or something...

I have very little experience with the Mustang dyno, but a recent magazine test (SCC?) tested a DynoJet versus a DynoPack and found both to be almost identical.&nbsp We're talking a 1-2hp difference at around 200rwhp, so on the order of just about 1%.


-Ted

The Mustang Dyno always give lower power level readings to the Dynojet. The amount I don't know. I will tell you this though, in my opinion the Mustang Dyno is a much better dyno to do tuning on.

crispeed
87 Rx-7 TII
9.204@150.47mph
2600lbs
un-tubbed

check out the following thread: "Had my car on the dyno this weekend"

AFAIK, Dynojet 248 dynamometers are inertial while the Mustang Dyno is a brake dyno. An inertial dyno relies on the power supplied by the vehicles' wheels to impart angular momentum to a drum, and it is the rate at which the the acceleration occurs that is recorded and converted to the numbers you see. A brake dyno, OTOH, operates by setting a brake (mechanical or electromagnetic or other) on the rotating drum and increasing the braking until the vehicle's engine that is under test holds a predetermined steady RPM at WOT, then moving the RPM a little higher, etc., until a plot is produced. It's felt that the brake dyno more accurately represents loads the a vehicle might experience "in real life." Takes a hell of a lot longer than a quick Dynojet run, however.

hoping to have an FD at the end of the year