crewchief264

The Dyno jet doesnt give as acurate readings as a Mustang-----real world!!!
I dyno'd my car with a mustang with y-pipe cai, cat back, and a act stage 2 and a quaife and got 158 hp and 168hp.. not sure what the 6,5 psi pulley puts out but in the near future will I' know what the 3.33 pulley puts outs intercooled and non intercooled v.s.! The mustang dyno in my research is a far superior dyno, especially for tuning! The recent hot rod mag gives a good explanantion for this.

Inertia v.s Sorry forgot what the mustang is....elctormagnetic resistance or something....,

DA-MAX

iTrader: (10)

here is a good breakdown comparison...

http://www.honda-tech.com/zerothread?id=564664

Mishap

As nice as those features are...it makes absolutely no difference if your car makes less hp on the dynojet than on the mustang dyno. Just realize the numbers aren't comparable. Dynapacks are even less comparable since they gain all the hp lost spinning the wheels. The only good chassis dynos are is to tell you whether or not your making power and to tune A/F.

Your car made the same power...the calculation was different along with the temperature, weight of rollers, dyno brake system, etc. The dynojet will give a perfectly fine assessment whether or not your car made power. If anything it's easier to fudge the numbers from a mustang dyno by simply inputting wrong values for weight and drag. The car will spin the rollers faster and get higher numbers. Put it in the hands of a crooked shop and you'll have magic numbers that aren't possible yet they showed you on the dyno.

There's almost no reason to calculate all that friction etc. You can't accurately assess hp on the street for every car out there. Unless you have a wind tunnel you can't tell if that 2" lowering is affecting your drag coefficient etc. Car manufacturers use an engine dyno w/ a constant loading that has nothing to do w/ drag or friction.

Edit: Mustang dynos also aren't rated to the hp speed levels that Dynojets are. Not an issue for most people but the shop we go to runs a Supra w/ over 1000whp.

Take an engine out of a Miata and put it into a H2 and it'll still make the same power. The only thing the Mustang dyno will tell you is H2 will be pretty damned slow.

Not saying the Dynojet is perfect. The light loading does mean you have to give a little room on turbo cars for A/F b/c there's more load but a 1000lb drum is more than enough load to give a solid reading on what kind of power the car is making.

A lot of the Mustang Dyno things are pointless advertising. It's not like the dynojet takes the measurement at the crank and your car could have 90% driveline loss and pushing 2whp. The Mustang dyno gets the same information from the same wheels. It only matters if the #'s are directly comparable. Having had cars do 30+ runs on a dynojet and see the hp every bit of additional fuel did is more than enough information to make a car fast.

Dreizehn

iTrader: (4)

The mustang is capable of doing such a test. (I believe.) A local shop here in Co. just recently bought a mustang. The shop was saying that they were able to load the truck to a constant load test.

Basically, the test is taking a set mph and push the truck as hard as you can. Isn't this a constant loading test?

He dynoed 580hp and 1300tq btw. 98 Cummins, damn those trucks are insane.

Synki

All dynos read different due to load %.

DynoJets read the highest.

DynoDynamics (known as the Heartbreaker) reads the lowest.

If you thought these dynos read low, check out the dynos is Australia.

Dynos are meant to help us tune cars. People also do road tuning which is actually better but not everyone is crazy about speeding around town trying to tune a car and making adjustments while driving.

Dyno numbers can never be compared (accordingly-since there is not such thing as a perfect world).

Track numbers is where it counts.

DerekJ212

iTrader: (1)

However, track numbers also cant be compared due to even more variables then a dyno...temperature, location, driving ability, etc..

Derek

Synki

I am not talking about comparing track numbers w/others. I am saying use your own track numbers.

DerekJ212

iTrader: (1)

Same variables still apply.