Ok, I had my first dyno done yesterday. I'll admit, I'm not very knowledgable about these dyno machines and such. So I have to ask, what is the difference between a Mustang dynamometer (which is what my car was done on) and a Dynojet? I know the mustang dyno's readout less than the dynojet, but what are each of these test machines measuring? And typically how much above a mustang dyno readout will a dynojet readout be?

And just to ask yet one more question....what do most of you guys quote for your hp ratings: mustang dyno numbers or dynojet?

 

there is an article in the new modified mustang magazine about this but i havent read that far into it yet, just read the first articles so far, c if u can find that mag

 

i think the mustang dyno reads around 10% less because it takes vehicle weight and some other factors into consideration.
I go by the dynoject numbers because around here that seems to be what everybody uses.

 

They take into account weight? I know that affects 1/4 mile time, but that has nothing to do with horsepower. That is stupid. Maybe I am wrong, I dunno.

 

Lets say a honda with dynos 250 HP and weighs 2000 lbs.
now a mustang dynos and makes 300 on a regular dyno.
it would dyno on a mustang dyno at 270 because it takes into consideration the weight of the car so you can see what your cars compare as.

can anybody help, is this true?

 

Yeah, but that would only work if everyone used that kind of dyno. If I show a friend my dyno sheet and it says 300hp and I tell him I really have 400, but the dyno does some math and lowers your horsepower, they would all just laugh and tell me I was a liar.

 

Weight really has no affect on how much HP a car puts down. The reason the two dynos will show different numbers is because of how they are loaded. Check out the web sites for a better explination, I am too lazy to type it all out, but basicly Mustang Dynos are better for tuning a car as they simulate the real world better, if all you care about is braging about numbers go to a Dynojet.
http://www.mustangdyne.com/chassisdynos.htm
http://www.dynojet.com/automotive_dyno/index.php

 

Thanks JD.........so I'm to assume that many of the ppl on this forum quote dynojet numbers for their power output estimates?[8D]

 

LOL I am not sure about that one Actually I think that the Mustang dyno is becoming more and more wide spread.

 

it needs to be...i dodn't drive on rollers....i drive on pavement.