Dynamometer Information
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Dynamometer Information
I have done a thorough search but have not been able to find a good compare/contrast thread on the various different dynos commonly used for our vehicles out there. I titled this thread for ease of future search and am hoping for the experts to chime in to make this an educational thread current and future members can learn from and reference later.
I have listed the ones I have read about and heard mentioned in the Porsche world, but I am most certainly missing some. Now, I am hoping to keep this thread limited to the more popular/readily available chassis models, not necessarily the obscure ones with limited use and availability.
I am looking for differences in use and readings. Such as, differences in power readings, 2WD vs. 4WD, rollers vs. hub adaptors, etc.
Here are the ones I have heard mentioned most often:
DYNOJET
MUSTANG
DYNO DYNAMICS
DYNAPACK
I have listed the ones I have read about and heard mentioned in the Porsche world, but I am most certainly missing some. Now, I am hoping to keep this thread limited to the more popular/readily available chassis models, not necessarily the obscure ones with limited use and availability.
I am looking for differences in use and readings. Such as, differences in power readings, 2WD vs. 4WD, rollers vs. hub adaptors, etc.
Here are the ones I have heard mentioned most often:
DYNOJET
MUSTANG
DYNO DYNAMICS
DYNAPACK
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A dyno is a tuning tool. you should use the same dyno before and after you mod to see what increases where made and where, or where you lost... I use two dyno's by me, a dynojet and a dyno dynamics the dyno jet reads 4% higher. Also the dyno dynamics and mustang dynos with their small rollers are very hard on tires. When my car hooks on the dyno dynamics it looks as if the tire is wrapping around the roller, that has to be robbing hp. Hub dyno? the highest reading dyno in the world.. Mustang and dyno dynamics have eddie current brakes that will hold your engine at a giving rpm to tune or keep you in a trouble spot to diagnose a problem.
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Exactly. My AWD Mustang eddy-current dyno will read different from any other Mustang dyno. For testing purposes it's best to use the the same machine.
I would like to see a car run on EPL's machine then on mine shortly after to compare. (similar weather conditions)
I would like to see a car run on EPL's machine then on mine shortly after to compare. (similar weather conditions)
Also its the Dyno operator that counts...A good dyno operator is also the key to doing comparision runs of testing parts..
He has to know about comparing runs even on the same day to to variables like heat soak and letting the car cool down besides weather/temp differences..
He has to know about comparing runs even on the same day to to variables like heat soak and letting the car cool down besides weather/temp differences..
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This gets even more confusing when you start to consider that even dyno's by the same manufacturer but are different models read different. Even the same dyno run by 2 different people can read different.
Its can be frustrating when a customer is disappointed in dyno results because they "Saw on 6speed" someone else was making more power with the same set up... when in reality they are comparing a 2wd dynojet dyno results vs an AWD Mustang Dyno sheet.
Sticking with that compare - A stock 6 speed 996tt makes about 325 awd hp on my dyno, while a car running in 2wd at our local dynojet makes 410. Thats a HUGE gap when trying to compare different set ups on different cars on different dynos and we basically do this all day long on this forum!
As Tim said above, a dyno is a tuning tool. If you want to use it as a measure of power, you NEED to know what your car made stock on the same dyno run by the same person and even then there a many many variables.
Its can be frustrating when a customer is disappointed in dyno results because they "Saw on 6speed" someone else was making more power with the same set up... when in reality they are comparing a 2wd dynojet dyno results vs an AWD Mustang Dyno sheet.
Sticking with that compare - A stock 6 speed 996tt makes about 325 awd hp on my dyno, while a car running in 2wd at our local dynojet makes 410. Thats a HUGE gap when trying to compare different set ups on different cars on different dynos and we basically do this all day long on this forum!
As Tim said above, a dyno is a tuning tool. If you want to use it as a measure of power, you NEED to know what your car made stock on the same dyno run by the same person and even then there a many many variables.
Now, other than the smaller rollers on the DYNO DYNAMICS (and MUSTANG) that Tim mentioned, what other pros/cons are there to one over the others out of the top three on my list (the ones mentioned here so far)? Also, are there cost differences to run? Like, will a 4WD cost more to run on than a 2WD?
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I have two buddies with dynos, one a mustang and other AWD Dynojet. Here is what you need to know.
Lets say your car makes 500whp. On either dyno I can give you +/- 20hp with smoothing and graphing magic. There's always talk that dynojet reads higher and I think that's true, but I can map a mustang dyno to look exactly the same. There is a lot of magic that can alter the reading.
Essentially what Tim said is correct, it's a tuning tool and use it as such. If you're testing a part, you can do a pull get a reading change a part then pull again and get pretty repeatable results that show the difference. As long as you don't change settings all else generally is pretty equal (car temp, air temp etc changes so some variances).
Me going to dyno here and you going to your dyno, the results are only comparable at a high level as there are a number of settings that can attribute to my dyno reading being higher than yours.
Lets say your car makes 500whp. On either dyno I can give you +/- 20hp with smoothing and graphing magic. There's always talk that dynojet reads higher and I think that's true, but I can map a mustang dyno to look exactly the same. There is a lot of magic that can alter the reading.
Essentially what Tim said is correct, it's a tuning tool and use it as such. If you're testing a part, you can do a pull get a reading change a part then pull again and get pretty repeatable results that show the difference. As long as you don't change settings all else generally is pretty equal (car temp, air temp etc changes so some variances).
Me going to dyno here and you going to your dyno, the results are only comparable at a high level as there are a number of settings that can attribute to my dyno reading being higher than yours.
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While doing some more internet research on the topic I ran across this interesting article:
http://www.hotrod.com/techarticles/g...g/viewall.html
http://www.hotrod.com/techarticles/g...g/viewall.html
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