Dyno Differences
Thread Starter
Drifting
Joined: Sep 2004
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From: Carson City, NV
Dyno Differences
Does anybody know if you run on a Dynapack dyno if it's basically the same horsepower and torque numbers as a Dynajet or Mustang dyno? Is there a correction factor commonly used? Just my curiousity because I sometimes hear folks say corrected rwhp, etc.
Former Vendor
Joined: May 2005
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From: Valencia Ca
Originally Posted by Cscokd
Does anybody know if you run on a Dynapack dyno if it's basically the same horsepower and torque numbers as a Dynajet or Mustang dyno? Is there a correction factor commonly used? Just my curiousity because I sometimes hear folks say corrected rwhp, etc.
For example: two cars that dyno'd ~ 650 RWHP on our DynoJet gained 50 RWHP on a Dynapak.
Former Vendor
Joined: May 2003
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From: Livermore CA
Originally Posted by CharlieTuner@AandACorvette
I know that there is a difference in the numbers, from what I've seen so far, the Dynapak reads 5-7% higher.
For example: two cars that dyno'd ~ 650 RWHP on our DynoJet gained 50 RWHP on a Dynapak.
For example: two cars that dyno'd ~ 650 RWHP on our DynoJet gained 50 RWHP on a Dynapak.
Not true. The problem is the Dynojet is the one thats inconsistant with numbers. Tires, gears, all the little things effect the numbers. The dynapack is not effected by those things. Look at Oz's car. It did just under 600 here and just under 600 on your dyno as well. I had guys from local dyno jets come over and get 10hp less. Happens all the time.
Rick
NCM, WSCC & SCC Member
Joined: Oct 2002
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Originally Posted by Synergy Motorsports
Not true. The problem is the Dynojet is the one thats inconsistant with numbers. Tires, gears, all the little things effect the numbers. The dynapack is not effected by those things. Look at Oz's car. It did just under 600 here and just under 600 on your dyno as well. I had guys from local dyno jets come over and get 10hp less. Happens all the time.
Rick
Rick
Here is one. Mine dynoed more on a dynojet before I met Rick and had it tested on his dynopak.
Not mention that the other car, that was mentioned earlier had a broken in new rebuilt clutch in it, because the old one, when it previously tested was dead and slipping. I guess it must have slipped your mind. Also his meth kit was working this time.
Former Vendor
Joined: Dec 2004
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From: Wixom Michigan
Inertia dynos give you a rough idea of your power, but are never consistent. They are cheap (for a dyno) which is why many shops buy them. All they can do is flat out power runs, and base their measurement on the acceleration of the drum mass, not true torque measurement.
Eddy-current dynos (i.e. Mustang) absorb power magnetically (and turn it into heat), and can be used to measure torque/power at steady speeds and are much more accurate and consistent. This is the only way to do tuning/mapping.
Well not really, there are also AC-drive dynos that OEM's use for development (i.e. AVL, Burke Porter) that can absorb AND provide power, and can hold vehicle speed extremely accurately under all conditions....be prepared to spend 7 figures. You will not likely find one in a performance shop.
Bob K
ATI Performance Engineering
Eddy-current dynos (i.e. Mustang) absorb power magnetically (and turn it into heat), and can be used to measure torque/power at steady speeds and are much more accurate and consistent. This is the only way to do tuning/mapping.
Well not really, there are also AC-drive dynos that OEM's use for development (i.e. AVL, Burke Porter) that can absorb AND provide power, and can hold vehicle speed extremely accurately under all conditions....be prepared to spend 7 figures. You will not likely find one in a performance shop.
Bob K
ATI Performance Engineering
