Dyno Jet or Mustang Dyno
Burning Brakes
Joined: Aug 2000
Posts: 984
Likes: 1
From: Cincinnati OH
Re: Dyno Jet or Mustang Dyno (GlockLT4)
How does one verify which one is correct? What is the calibration tool? If I do exactly 55,000 foot*lbs of constant rate work in one second on either dyno, which one reads closer to 100.0 hp? I would like to see people back up their claims on this one. (I don't know the answer, but this is the internet afterall, so maybe I should just pick one and insist that it is right? :jester )
Former Vendor
Joined: Jun 2001
Posts: 7,204
Likes: 6
From: St Marys PA
Re: Dyno Jet or Mustang Dyno (FoolCrzy)
Its really all relative when using it to tune. If it reads accurately time after time, you will see either an improvement in HP/Tq or a loss.
The only place if one is truely higher than the other it would benefit, is in the braggin rights department. :cheers:
The only place if one is truely higher than the other it would benefit, is in the braggin rights department. :cheers:
Race Director
Joined: May 2001
Posts: 14,165
Likes: 9
Re: Dyno Jet or Mustang Dyno (R94 LT 1)
IMHO it doesn't matter which one is "right" but rather which one is used as the standard. If everybody uses a dynojet, I want dynojet numbers to compare with. If everybody uses a mustang dyno I want mustang numbers to compare. If everybody runs a bubba dyno I want a bubba dyno to compare with.
As such since most people quote dynojet numbers, using the SAE standard, that's what I use.
As such since most people quote dynojet numbers, using the SAE standard, that's what I use.
Le Mans Master
Joined: Oct 1999
Posts: 9,713
Likes: 3
From: Sachse Texas
Cruise-In I Veteran
Cruise-In II Veteran
Re: Dyno Jet or Mustang Dyno (Vince Ivanc)
I suppose you could ask the same about corrected versus uncorrected numbers. I always use SAE corrected from a Dynojet as that is what all of the shops in DFW that I visit have installed.
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Melting Slicks
Joined: Aug 2000
Posts: 2,009
Likes: 1
From: Springfield MO
Re: Dyno Jet or Mustang Dyno (Vette92)
Which ever one you choose, make sure you go back to that one for mod results. Really it doesn't matter which one you go to, it's all about getting results and then improving upon them.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Re: Dyno Jet or Mustang Dyno (R94 LT 1)
all dyno's are unique...
I race RC cars... there are several different dyno's out for them, too. The biggest thing is making sure you use the same one. and be consistant in testing.
I race RC cars... there are several different dyno's out for them, too. The biggest thing is making sure you use the same one. and be consistant in testing.
Melting Slicks
Joined: Apr 2000
Posts: 3,490
Likes: 2
From: Oviedo FL
Re: Dyno Jet or Mustang Dyno (bogus)
My car dyno'd 351/351 on a Dynojet 248e, and then 3 weeks later I had it dyno'd on Breathless's Mustang Dyno and it came out 366/378. I have always gone by the Dynojet figures as you can see in my sig...
Mike
Mike
Drifting
Joined: Jun 2001
Posts: 1,997
Likes: 1
From: Lake Ozark MO
Re: Dyno Jet or Mustang Dyno (R94 LT 1)
Certainly you are using the dyno for quantifying the results of your mods and not for bragging rights.
For the purpose of testing it won't matter as long as you remain consistent and use the same dyno for each testing session (with wideband O2's I hope).
For the purpose of testing it won't matter as long as you remain consistent and use the same dyno for each testing session (with wideband O2's I hope).
Drifting
Joined: Feb 2002
Posts: 1,952
Likes: 2
From: Little Rock Arkansas
Re: Dyno Jet or Mustang Dyno (Dan Parker '96)
Mustang dynos are eddy-current load dynos while DynoJet's are inertia. For tuning the edge goes to the Mustang because of its ability to load the engine in different ways to simulate real world driving conditions. They do tend to be more conservative than DynoJets but seeing as how there is no standard by which chassis dynos are rated one can't be sure which one is "right." However, you can change the load parameters of the Mustang to totally replicate that of a DynoJet and then they are almost dead even. And, DynoJet has come out with an eddy-current dyno of their own to compete with the Mustang. What's my real world analysis of the two? For some reason you tend to get more parasitic loss off of the Mustang vs. the DynoJet because of the way it loads the chassis. On our DTS engine dyno (using my old 396 as the example) I got 571 hp/505 lb/ft tq. On a DynoJet this same engine produced 466 rwhp which equates to roughly an 18% loss on my ZF equipped car. On a Mustang (while tuning the DFI) the same combination, unchanged, made 418 rwhp or a loss of somewhere between 25-30%... Hope this helps.
-Jeb
-Jeb
Thread Starter
Le Mans Master
Joined: Apr 2001
Posts: 7,412
Likes: 259
From: Little Elm TX
Re: Dyno Jet or Mustang Dyno (jburnett)
Mustang dynos are eddy-current load dynos while DynoJet's are inertia. For tuning the edge goes to the Mustang because of its ability to load the engine in different ways to simulate real world driving conditions. They do tend to be more conservative than DynoJets but seeing as how there is no standard by which chassis dynos are rated one can't be sure which one is "right." However, you can change the load parameters of the Mustang to totally replicate that of a DynoJet and then they are almost dead even. And, DynoJet has come out with an eddy-current dyno of their own to compete with the Mustang. What's my real world analysis of the two? For some reason you tend to get more parasitic loss off of the Mustang vs. the DynoJet because of the way it loads the chassis. On our DTS engine dyno (using my old 396 as the example) I got 571 hp/505 lb/ft tq. On a DynoJet this same engine produced 466 rwhp which equates to roughly an 18% loss on my ZF equipped car. On a Mustang (while tuning the DFI) the same combination, unchanged, made 418 rwhp or a loss of somewhere between 25-30%... Hope this helps.
-Jeb
-Jeb
Melting Slicks
Joined: Jun 2000
Posts: 3,215
Likes: 6
From: Tampa Florida
Re: Dyno Jet or Mustang Dyno (R94 LT 1)
Okay folks, here is the truth!
Latest Chevy High Performance does a back to back test using 2000 Camaro on a Dynojet and a Mustang 250...their findings were Mustang was closest to real world and Dynojet was inflated! They also did actual acceleration runs with same car on flat ground to mimic the dyno profiles...
I'm more kidding folks as the article was interesting, but there isn't a 'right' dyno for the above reasons others have stated. I definitely like to do back to back testing for stuff though-gives me piece of mind which is huge in my book!
Besides, I could care less about bragging numbers...
Latest Chevy High Performance does a back to back test using 2000 Camaro on a Dynojet and a Mustang 250...their findings were Mustang was closest to real world and Dynojet was inflated! They also did actual acceleration runs with same car on flat ground to mimic the dyno profiles...
I'm more kidding folks as the article was interesting, but there isn't a 'right' dyno for the above reasons others have stated. I definitely like to do back to back testing for stuff though-gives me piece of mind which is huge in my book!
Besides, I could care less about bragging numbers...
