Onyx Z

iTrader: (3)

What are the differences and why do they dyno differently?

Ryan

WILWAXU

iTrader: (6)

ttt

BurnOut

iTrader: (1)

I read an article lately, and IIRC, the gist of it was that the Mustang dyno has a provisionable parameter to take into account rolling/aerodynamic drag. That is to say that the Mustang drags the brakes on the rollers according to what the variable is set to. I think.

Anyhoo, the article had a car dyno'd on a DynoJet, a Mustang, and they had an optical 5th wheel as well... they found that actual 50-70 times (as measured by the 5th wheel) were MUCH closer on the Mustang dyno than on the DynoJet. Additionally, IIRC, a DynoJet simulates something like a 2450 pound load (the weight of the drum??); so if your car weighed 2450 pounds, your acceleration times while rolling would be approximately the same as on a DynoJet or a Mustang dyno. I think.

Ed Blown Vert

iTrader: (2)

But if you gain say 10% on a Mustang dyno, would it be 10% on a DynoJet??

v8maro

iTrader: (4)

not if the drag on the mustang is dynamic or exponential.
Or
the gain on the car is exponential and not linear
-Steve

Crazyquik

Mustang is better for tuning as the load is programable depending on the type of car.

So you could dyno a 4000 lbs truck and then a 2200 lbs car, and get a better tune as the dyno could be optimized for each.

J.

smokin' joe 00 ss

On the same car you can see as much as a 30 to 50 rwhp difference from the mustang dyno to a dynojet. The Mustang dyno will give you real world #'s.

promod1955

iTrader: (44)

a mustang dyno is an eddy current dyno. a dynojet is an inertia dyno. most eddy currents dyno lower. besides mustangs are always down on power...

smokin' joe 00 ss

lol,

SouthFL.02.SS

My numbers are mustang figures.

smokin' joe 00 ss

Where did you get that dynoed at, those are the best C1 cam and no head LS1 #'s with 4.10 gears and a 12 bolt on a Mustang dyno on the face of the planet. Most stage 2 heads & cam cars on a Mustang dyno come in between 360 & 390 rwhp. Congrats on the great #'s what kind of 1/4 mile times do you turn?

critter

iTrader: (9)

Pardon my ignorance. I know about eddy current and water brake dynos, but what is an inertia dyno? I sounds like the resistance to the power (or more properly torque) is the inertia of a large drum rather than an electrical or water brake.

Argon Z

i researched it and i found that it was somthing like 11 percent less then a dynojet.

Check my sig. Mustang dyno numbers, yet i am pulling alot of mph in the quarter.

A general rule
e.t. is a function of traction
mph is a function of hp

SouthFL.02.SS

I wish I had a 12 bolt! 1/4 mile times suck major, major *** (I've only run 2 passes w/ this setup), as I spin the stock Goodyears F1's 'till deep into 3rd gear! That said, my only traction gear is 4th. Even then I trap @ 111. Er, eh, cough cough, 13.0 w/ 2.2 Nittos anyone?
Ain't got no traction baby!!!