I always see where people say the differences in 2 dyno's could be alot. Im getting my car dyno'd here in a few weeks and its a Mustang dyno for dyno tuning. From where I hear these dyno's will be about 20hp or so less than a standard dyno. Is this correct?

 

ttt

 

Mustang dynos give lower readings than Dynojet according to most people, however they are better for tuning. Regardless, when alot of people post their dyno results, they include "dyno know to be low"

 

I will have some numbers to post in a few weeks. Thanks man.

 

If there was a figure like 20hp, it would have been known already. The whole point is that you can't compare the numbers from different dynos, especially different brands. For example a Mustang dyno includes the weight of the car and estimates of wind resistance. A Dynojet does not. If the guy enters 100lbs for the weight of your car, or enters 10,000lbs, you'll get different HP numbers out. No such thing on a Dynojet. So while the Mustang is a great dyno for you to use for your PCM tuning, don't try to rationalize why your numbers look different to the majority of folks that have used a Dynojet, they're just gonna be different.

Dave

 

How does wind resistance and weight of the car affect rwhp? If I ran my car on a dyno and made 405rwhp then had 3 of my buddies jump in the car and make another run it shouldn't affect the power output, only the acceleration of the car down the road.

Also, if the standard for SAE horsepower is the same around the world shouldn't 405 SAE rwhp on a dynojet be the same as 405 SAE rwhp on a mustang dyno as well? Since a chassis dyno is a measurement tool just like a torque wrench they should all be calibrated the same.

 

I know that rwhp on a tuning dyno will differ from a dyno made just to see hp results.

 

Great question. When I went through this discussion, I contacted the Mustang folks (http://www.mustangdyne.com/) and was told that they include those parameters (along with others like temperature, etc) because it gives a more realistic result.

I don't agree with them, but that's what they told me.

Dave

 

It gives the mustangs an excuse for losing

 

A Mustang dyno isnt a dyno for Mustang's. It's the name or brand of the dyno.

 

So you figured out the problem you were having after you had your cam installed?

 

Yeah! Bad valve adjustments. I had a total of 3 cylinders on 0 compression. Not too good but she sure runs fine now.