I'd ask for my money back. It simply is not correct. Hp must equal torque at 5252.

See http://www.car-videos.com/articles/horsepower_torque.asp

John Harvey

 

I initially misread that graph. ::

An air fuel ratio that looks like that on a graph would make me suspicious of the accuracy.

If it does happen to be correct, you're lean.

I'd look for a different shop. That printout doesn't do you much good I'm afraid.

 

That printout is pretty hard to interpret. I know Mustang dynomometers give different readings than Dynojets do but something's odd. Even the H.P. graph has no graduation marks to tell whet the readings were. Heck, he didnt even rev it to 5000 rpm's.

The A/F ratio may as well not even be there. The only one I've ever seen so flat was on a GMC 2500 pickup truck. It was a rock solid 14.7 from idle, all through the dyno pull, until the computer hit the rev limiter at 100mph.

 

I reved it to 5300 on my tach, That was his computer read ut due to read by the drum rpm and not my tach.

 

I'd ask for my money back. It simply is not correct. Hp must equal torque at 5252.

IIRC---5252 is correct on a flywheel dyno. But on a wheel dyno you have gearing to contend with that changes the torque curve. More gearing more torque(that info from your own link)

 

I'd ask for my money back. It simply is not correct. Hp must equal torque at 5252.

See http://www.car-videos.com/articles/horsepower_torque.asp

John Harvey

Actually, according to the graph, both HP and torque are around 230 at 5000 rpm, so they could be the same at 5252. The scales are just different. Probably, they automatically adjust to the maximum value.

The A/F ratio is unusually constant. You either have a perfect carb that is jetted too lean or the measurement is wrong.

 

very strange looking chart

 

That's what's weird to me. The outfit I did a dyno on last year uses a Mustang dyno as well. They had to go through some machinations to rig something to get engine RPM for the dyno - and that was something in the engine compartment. I was sitting in the car, so I didn't see what they did, but I want to say it was something akin to a timing light doohickey - they did have an issue with my setup as they couldn't do the normal 'clamp onto a wire' solution they apparently normally use.

-bob