What give more accurate real world HP ? I heard that DynoJets may show on average 13% higher than Mustangs. Why if so which is accurate ?

 

MUSTANG DYNO is more accurate.
You can put a load on the drive train while accelleratin, Dyno jet can't

 

dynojet is the industry standard. Mustang dyno's can be manipulated to show HP gains that aren't there. Thus I would say the mustang dyno is less accurate. Although on the flip side the mustang dyno can give you "real world" data.

dynojets do run higher than mustang dynos in MOST cases. I've heard anywhere from 5-15%.

Get a dynojet dyno simply because it's industry standard.

 

WHO do you know has ever "held" a load on a dyno?

NO ONE...yet that is the main reason to use a Mustang dyno? Dynojet can also hold a load.

 

If you guys are referring to the Eddy Brake that the mustang dynos have, Dynojet does have one for their model 224 auto dyno. I wouldnt exactly recommend a 224 model dyno for our trucks, if you can find someone with a 248 model I have found them to work a little better with the larger drum. I have always had issues with slipping on the 224.

-Kimball

 

Only because vehicle owners want to be lied to
about what their vehicle is making in horsepower.

Let's see ... Would you like to hear ...

"Your actual computed horsepower at the wheels is 400"

or

"The DynoJet has you at 460 HP at the wheels"

If you want the truth, just run on both an compare.

IMHO, the only thing a Dyno sheet is good for is seeing
what a particular mod changed, so either one is adequate.

Some see it as bragging rights, and that's where the
p i s s i n g match starts.

 

I had my truck dyno tuned on a mustang dyno and it made 404/505 to the wheels

2 months later i dynoed on a dynojet dyno and it made 429/537 to the wheels if that answers your question

personally i think the mustang dyno gives a more "real world #'s"

404/505 is what i advertise because i dont want to over-rate my trucks capabilitys

hopefully a Magnum will go on soon and i'll keep you posted on what it makes on the Mustang-dyno

At 16 #'s and stock block, praying for 450/550 on 93 and high 11's

LS1 hunting season is almost open ( early fall 04')

 

I believe the best way to find out which one is more accurate is this:

1) Make some 1/4 mile runs at the strip.

2) Dyno on both a Mustang and Dynojet Dyno.

3) Calculate your HP by plugging in your trap speed, vehicle weight, etc into a HP formula based on track speeds.

4) Compare your calculated HP to the Dyno runs and see which one is closest.

 

you can adjust too many things on a mustang dyno. numbers can be skewed to what you want them to read. You aren't as capable to do that with a dynojet.

industry standard is industry standard. Wether you like it or not, the Dynojet is the standard.

My car was dynoed on a Mustang Dyno. I have yet to have it on a dynojet.

track times have too many variable to determine HP.

although I think track times are more important than HP numbers.

 

Actually, it is the industry standard only because there are more of them out there.

And there are more of them out there because they are way cheaper.

So, even if they showed less HP than a Mustang, I suspect that DynoJet would still be the industry standard.

 

Well since there are so many variables on either, what difference does it make?
As was said, use the same dyno to compare before and after mods on your truck.

 

Food for thought.........

How does Ford calculate flywheel horsepower. With a load control dyno, not an accelerometer.

Engine dynos are all load control (eddy current, water brake) dynos, not accelerometers.

There is probably a reason for that.

 

why bother with the bitching.........facts are facts. Dynojets are used more and are standard. Period.

 

The May '04 HOT ROD Magazine did some testing with different dyno's to finally put the rumors to rest. They used a bone stock Mustang GT to test. On a Dynojet, the 'stang made 226hp STD and 221hp SAE. On the Mustang eddy-current, the 'stang made 219hp. Thats certainly not a 13% difference.

Some other interesting stuff was showing all the different ways chassis dyno numbers can be manipulated. On one test, a single 'click' on the rachet tie-down cost 10 hp. There's also a bunch of fudging the dyno operator can do with the software. Thats why you see big HP cars that don't seem to run the numbers they should. And what BurnTire said, a loaded brake dyno that uses a strain gauge to measure torque is much more accurate than an inertia dyno.

 

How I look at it is it should not matter what your vehicle weighs to figure out what your vehicle makes.

Sorta like two guys in a pissing match about bench pressing. Guy A weighs 250 lbs, buy B weighs 150 lbs. Would you change the weights in accord to the weight of the guys? No, that would be silly.

I work at a dyno part time, dynoed 100's of cars, even had the guys @ Mustang dyno come and dyno some of their cars to see how they would do. Ironic how they were taking pictures of everything, even offered to buy the wide band setup that Dynojet supplies...not saying anything bad about the company, it a local company and that is a good thing...but the way they conducted themselves made me think....

A dyno is about your vehicles ability to move a certain amount of weight in as short as time. It is absolutely irrelevant if your car weighs 2000 lbs or 5000 lbs.

1 click equal 10 hp, not on any drag radial or radial you can buy. If that was the case, being how people only want the #'s, the damn things would barely strapped down.