Dyno

[Kangbateh]

What is a good dyno machine to measure horsepower and torque? there are al types of models, but I don't know if one is better over the other. I ask this because in Minnesota good import shops are hard to find and there is one shop that has a Dynojet dynometer model 248C and I don't understand the difference and don't want to take the risk if I don't know.

[Bbasso]

I person from a diff site said this.
"A dynojet dyno does not realistically load a vehicle for tuning. Dynojet uses an inertial drum, which similates load for a typical vehicle (3000-3500 lbs). This "typical" vehicle inertial maybe somewhat realistic for american muscle cars, but not for the typical import car.

With an eddy current dyno such as the Mustang dyno, the dyno operator enters the approximate weight of the vehicle, and with the Mustang dyno, an aerodynamic factor. The computer calculates the load to apply to the rollers based on vehicle speed to realistically load the vehicle. What does this mean? If you properly tune your car on an eddy current dyno, the car will run well in the real world.

Also, an eddy current dyno allows part throttle tuning. Part throttle can not be tuned properly on a Dynojet. Some will argue that part throttle tuning should be done on the street. However, street tuning can be dangerous.. operating a computer while driving. Also, how do you know what fuel/timing is best to optimize part throttle driving?

As for a comparison of Dynojet vs. Mustang numbers, I am currently compiling data to correlate the two. I will post results when I'm done. Here's a sneak peak: generally speaking, light vehicles (~2500 lbs) read 15% higher on a Dynojet. Heavy vehicles (~3500 lbs) read 5% higher on a Dynojet.

By Bob"

thought it might help

[Kangbateh]

Thanks

I want to get as close to the real tunning numbers as possible and not get screwed in the process. I've heard about that mustang dyno but didn't know anything about it. That article gave me a better insight into finding a dyno that better reflects a accurate load to put down to the wheels on the street.


My mind is the weapon, my heart the extra clip...

[TopEndBlitz]

i tuned mine on a mustang dyno, it made 311hp then i went to a car show with a dyno jet and made 367. the dyno jet is the numbers everyone likes to see cause the give the highest reading. but what i like about the dyno jet is you tune your car based on rpm, on a mustang dyno you run your car from like 35mph to 79 mph depending what gear you run in, and it takes your power from between that speed, but if 79mph is say 7700rpms then you gotta keep making runs till you find where your mph meets your desired rpm before you can start tuning, then if you want a higher shift point then you gotta set your mph al over again, its kind of a pain. but either way just make sure you use the same dyno to tune with each time you go that way you'll know if a mod you made actually worked or not.