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What dyno to use?


topjay
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  • 5 months later...
  • 2 years later...
Which dyno would be better as they are both local?

 

 

 

Rototest VPA-R chassis dyno

 

Dyno Dynamics

 

I've never heard of Rototest before. DynoJet is the most popular dyno and is typically the best to use if trying to compare your cars power output with other peoples online results since Dynojets are extremely consistent and the operator cannot manipulate the numbers like on a Mustang Dyno, Dyno Dynamics and some of the other dynos. However, if you are just going to do a before and after dyno test of your car then just pick whichever dyno is the most convenient and make sure to use the same dyno for your testing.

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  • 2 years later...

Dynojets use a correction factor that can easily be manipulated by the operator. They consistently read higher because of the correction factor. Most Dynojets use a 1.15 correction factor in order to determine crank hp. I could go into great detail as to why the correction factor is silly and how they came up with it. That being said, any dyno can have numbers manipulated. However, if you ask around, Dynojets usually read 5-15% higher than a mustang, dynapac or any other eddy-current type dyno. The basic idea as to why it is assumed that Dynojets read more accurately is because they measure hp by determining the increase in rotational speed per rpm given a defined mass (the mass of the drum that the wheel is spinning.) so.. In theory, the dynojet should be the most accurate.. But, due to the simplicity of adjusting the correction factor and the constant need for shops to say that they have created the most powerful car.. It gets abused. The only way to be certain is to do a before and after on the same dyno. At least that way, you can see what kind of increase you have. (Yes.. There are humidity changes, barometric pressure changes, temperature changes etc.. To contend with)

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Dynojets use a correction factor that can easily be manipulated by the operator. They consistently read higher because of the correction factor. Most Dynojets use a 1.15 correction factor in order to determine crank hp. I could go into great detail as to why the correction factor is silly and how they came up with it. That being said, any dyno can have numbers manipulated. However, if you ask around, Dynojets usually read 5-15% higher than a mustang, dynapac or any other eddy-current type dyno. The basic idea as to why it is assumed that Dynojets read more accurately is because they measure hp by determining the increase in rotational speed per rpm given a defined mass (the mass of the drum that the wheel is spinning.) so.. In theory, the dynojet should be the most accurate.. But, due to the simplicity of adjusting the correction factor and the constant need for shops to say that they have created the most powerful car.. It gets abused. The only way to be certain is to do a before and after on the same dyno. At least that way, you can see what kind of increase you have. (Yes.. There are humidity changes, barometric pressure changes, temperature changes etc.. To contend with)

 

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  • 1 month later...

We just purchased a Mustang AWD linked dyno. At first we were going to purchase a dynojet but we ultimately decided to go with the Mustang. Their were a lot of decisions that played into this choice.

 

A lot of people like some of the dynos that are coming out of Australia but I wanted one that was made in America and was easy for me to get serviced if it breaks. It doesn't matter how good your dyno is, if it's broken then it's no good and I hear horror stories about some dynos sitting around broken, waiting to get prepared.

 

We were originally going to get a dynojet because of the numbers and customers like big numbers but we quickly realized that the most important aspects for us to deliver quality parts and services to our customers wasn't in providing them inflated numbers.

 

After talking to many owners of dynos we decided that the Mustangs software was far superior to everyone else and it had less moving parts for the AWD system. The dynojet adjusts to different wheelbases by moving on a tack and the Mustang doesn't move at all, it has multiple rollers to cover a wide array of wheelbases. Mustang also has drag race programming that was interesting to us as well considering drag strips are a thing of the past in Southern California.

 

Our particular dyno is being installed in a sound proof room and we have invested in some very expensive fans to move air across the car in order to simulate actual driving conditions. One of the fans that we have purchased weighs over 9000lbs.

 

It seems that most Lamborghini owners are not really that interested in using a dyno to check their car before modifying it but we want to get as much information on everything that we do so we plan on putting our dyno to good use.

 

 

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  • 2 years later...

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