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Old 01-17-2009, 08:24 PM   #1
dauss
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Talking Same Car, Five Different Dynos

So, I've taken my car, to five different dynos. No modifications were made between the dyno runs, all were on the same wheels and snow tires. Enjoy.
Vehicle: 2005 WRX 2.0L Turbo
Mods: Cobb TBE, Crucial Racing UP, GrimmSpeed PnP Coated Exhaust Manifold
Who Tuned the Vehicle: Adam at Revolutions Performance, Cobb Accessport v2
Which Dyno and CF: See below
Pertinent Runtime Variables: Stock wheels, Yokohama Ice Guard IG721 Snow tires, 3rd gear pulls, same setup, 91 octane.

Colorado Springs, CO. 5978 FT, 1.14 CF, Revolutions Performance, Dyno Dynamics



Colorado Springs, CO. 6141 FT, 1.223 CF, SR-Tuning, Mustang Dyno

The ink must have been running low. I went back and redrew the lines in black. I have the dyno sheet right in front of me and I can still barely read it.

Parker, CO. 5836 FT, 1.23 CF, MAC Autosport, Dynojet Dyno



Parker, CO. 5836 FT, 1.00 CF, MAC Autosport, Dynojet Dyno

Threw this one out there. Same exact dyno run as above, but without any correction.

Denver, CO. 5422 FT, 1.2061 CF, Racing Trenz, DYNOmite Dyno


Lakewood, CO. 5450 FT, 1.228 CF, Carz Performance, SuperFlow Dyno


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Last edited by dauss; 04-03-2009 at 07:23 PM. Reason: more charts
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Old 01-17-2009, 08:42 PM   #2
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2 sheets missing?
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Old 01-17-2009, 08:42 PM   #3
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Good stuff, you can definitely see the loading differences between them.
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Old 01-17-2009, 09:01 PM   #4
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So???? Mustang Dyno read higher than the Dynojet & Dyno Dynamics??? That's a mind boggling concept.
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Old 01-17-2009, 09:11 PM   #5
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Quote:
Originally Posted by 4ST-AIR View Post
So???? Mustang Dyno read higher than the Dynojet & Dyno Dynamics??? That's a mind boggling concept.
Actually I see the dynojet and the mustang reading the same. 1 hp higher on the mustang and slightly higher torque on the dynojet if you are comparing them side by side.
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Old 01-17-2009, 10:31 PM   #6
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Quote:
Originally Posted by cubuff View Post
Actually I see the dynojet and the mustang reading the same. 1 hp higher on the mustang and slightly higher torque on the dynojet if you are comparing them side by side.
But if you have seen ALLLLLL the PPB boast's then you know the argument is always been that the Mustang Dyno reads so god damn low that its almost 20% LOWER than a Dynamics or Jet.

I still think its a big scam based on how the Dyno your on is manipulated behind the scenes.

I have read thousands of posts and threads and I cannot even tell you how many hours I have sat and just read on NASIOC.

Last edited by 4ST-AIR; 01-19-2009 at 02:13 PM. Reason: Because Drinking and Posting never mix!
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Old 01-17-2009, 11:47 PM   #7
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Just to clarify.

I used to be one of the owners of the DD used in this test. I'm out of the performance business now so I have not vested interest (other than a purely academic one) in these results.

I can guarantee that the DD results are as accurate as the equipment allows. There is well documented stuff about how a half correction (1.14 or the dyno calculated a ~1.28 on that day) on the DD is about identical to a d-jet uncorrected.

I also know the owner of the mustang used in this test very well. 20+ year OCD anal retentive electrical engineer. I can pretty much vouch for the fact that he's done whatever it takes to make sure that the results coming off that unit are as accurate as they can be. However, his dyno IS a prototype unit running beta firmware. I have ZERO idea if they (mustang) have changed any load calc. stuff behind the scenes with that firmware.

The owners of that d-jet are kind of idiots. But the results are pretty much inline with what you'd expect.
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Old 01-18-2009, 12:28 AM   #8
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I am surprised the Mustang read so high honestly. Normally the Mustang lands alot closer to the DD and by all accounts, the DD is the one I would trust. If you want a DynoJet number, just jump in the car, hit the highway and load up DLL.

/brox
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Old 01-18-2009, 12:47 AM   #9
Iflysti06
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This is a very interesting post! Thanks!
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Old 01-18-2009, 01:03 AM   #10
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Quote:
Originally Posted by 4ST-AIR View Post
But if you have seen ALLLLLL the PPB boast's then you know the argument is always been that the Mustang Dyno reads so god damn low that its almost 20% more thatn a Dynamics or Jet.

I still think its a big scam based on how the Dyno your on is manipulated behind the scenes.

I have read thousands of posts and threads and I cannot even tell you how many hours I have sat and just read on NASIOC.
What threads have you been reading? Show me a few where a DD is reading 20% higher than a Mustang. Dynojet, for sure. DD, nope.

Usually I see, numbers wise, DJ > DP > Mustang > DD > Maha.
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Old 01-18-2009, 01:52 AM   #11
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That DynoJet reads abnormally high. I remember making 305whp/343wtq on that dyno w/ Cobb Stage II OTS. They use the same correction factor on N/A cars as they do F/I at that altitude.
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Old 01-18-2009, 03:19 AM   #12
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Quote:
Originally Posted by Clark_Kent View Post
That DynoJet reads abnormally high. I remember making 305whp/343wtq on that dyno w/ Cobb Stage II OTS. They use the same correction factor on N/A cars as they do F/I at that altitude.
Apparently not.. This guy's stage two only made 236whp which is right in line for a td04.
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Old 01-18-2009, 04:43 AM   #13
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Dyno Dynamics are very popular in Australia, as are mainline dynos (which I don't think you guys have?).
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Old 01-18-2009, 08:45 AM   #14
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Now all you need is 1/4mile, 3 different tracks!
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Old 01-18-2009, 11:06 AM   #15
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I've done a similar comparo with my stage 2 STi on 104 octane.

On a Dyno dynamics with 1.00 cf the car put down 325 peak whp.

On a Mustang dyno the car managed 306 peak whp.

On a dynojet the car made 390 peak whp (cold temps, car felt amazing)

The torque numbers were all completely differnt as well. 387,420,475.

Said it a million times, true trap speed = true power
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Old 01-18-2009, 11:10 AM   #16
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Quote:
Originally Posted by wrxsti.l View Post
Dyno Dynamics are very popular in Australia, as are mainline dynos (which I don't think you guys have?).
What is this dyno like, never heard of it??? hub or roller?
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Old 01-18-2009, 11:37 AM   #17
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On the DD the torque comes on 500 rpm later??? Would the rpm calibration be off?
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Old 01-18-2009, 11:38 AM   #18
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I'm looking into going to a couple more shops and getting the charts of a Dynomite and a Super Flo. I'll post the results if it happens.

Quote:
Originally Posted by SW00P_G View Post
Now all you need is 1/4mile, 3 different tracks!
As long as I own this car, it will never be dragged.
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Old 01-18-2009, 05:07 PM   #19
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There are variables not being accounted for in these comparisons like IAT's, load or no load, corrected or uncorrected etc. Also the fact that the stock ecu with the cobb reflash will learn and automatically adjust the tune as well. Either way though, the fact that all dynos don't read the same has been known since their existence. That's why Dyno #'s are just that.....numbers. A dyno's main purpose should be for tuning.
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Old 01-18-2009, 06:33 PM   #20
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As long as I own this car, it will never be dragged.[/quote]

oh, it'll happen. just wait. you'll do it. and you'll like it!
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Old 01-18-2009, 06:44 PM   #21
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Just a suggestion!
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Old 01-18-2009, 08:15 PM   #22
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Quote:
Originally Posted by Super Nintendo View Post
Apparently not.. This guy's stage two only made 236whp which is right in line for a td04.
The dyno must have been recalibrated but those are the numbers I made. Unless something changed everyone in the area knows that they DynoJet has read extremely high in the past on F/I cars.
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Old 01-18-2009, 08:49 PM   #23
`04AlpineWhite
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Quote:
Originally Posted by Super Nintendo View Post
Apparently not.. This guy's stage two only made 236whp which is right in line for a td04.
You've failed to account for the altitude and the snow tires.
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Old 01-18-2009, 09:46 PM   #24
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Quote:
Originally Posted by I'm Slow View Post
There are variables not being accounted for in these comparisons like IAT's, load or no load, corrected or uncorrected etc. Also the fact that the stock ecu with the cobb reflash will learn and automatically adjust the tune as well. Either way though, the fact that all dynos don't read the same has been known since their existence. That's why Dyno #'s are just that.....numbers. A dyno's main purpose should be for tuning.
You have no idea what you are talking about do you?

Everything you just listed gets taken care of by using a correction factor. That's why the exist.
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Old 01-18-2009, 10:23 PM   #25
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This test should have been done without any correction factors on any of them. (assuming the elevation and temperature is similar)

Anyway this are the numbers uncorrected.

Dyno Dynamics = 176.5 WHP (about 8 % lower than that Dynojet)

Mustang Dyno = 194.5 WHP (Not the norm)

Dynojet= 192 WHP (the norm)

The only numbers that are a little odd are the Mustang dyno (must be that Beta firmware). Usually their numbers are closer to the Dyno Dynamics numbers.
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