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Dyno chart smoothing? Does it make a difference? See for yourself...

18540 Views 66 Replies 27 Participants Last post by  sjsche
10
I read comments on here once in a while about how FocusSport likes to use a lot of smoothing on their dyno charts. Or how there is a big difference in smoothing from 3 to 5. Or from 1 to 5. Or from...you get the idea.

So why don't we just take a look for ourselves?

First example - Paul Haskew's 2.3 Turbo Duratec

Smoothing set at 1 - The LOWEST setting on dynojet software



Smoothing set at 2



Smothing set at 3



Smoothing set at 4



Smoothing set at 5 - The HIGHEST setting on dynojet software





Second example - FocusSport 2.3 Duratec project car

Smoothing set at 1 - The LOWEST setting on dynojet software



Smoothing set at 2



Smoothing set at 3



Smoothing set at 4



Smoothing set at 5 - The HIGHEST setting on dynojet software




Horsepower and Torque can change slightly with the different settings, but its not anything major. A dyno chart from a well sorted car with a good hardware and software package will look good at any setting. A chart from a car with a not so well sorted hardware and software package will look like it needs help at any setting.

So there it is, laid out flat for you to see. Now you can see for yourself how much of a difference each setting makes.
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pitchblack23 said:
Since we have a dyno thread here, I have a question. How does gearing figure in to dyno measurement? I'm taking my car to a dyno day this weekend, and was wondering if I should swap my Rotas and tall Azenis for the 1" shorter stock stuff. Will it make a noticeable difference?
Here's the skinny as I understand it.

Dynoing in 4th gear is the preferred method, as 4th gear is the closest to a 1:1 ratio. Now with that said here are the plusses and minus to each as far as I know..

4th gear
  • Should also provide HIGHER HP numbers than running in a lower gear.
  • Better engine VE due to going through the RPM's slower, which means the valves stay open longer.
  • Less parasitic losses from gearing due to going through the RPM's slower
  • More heat generated, great chance for engine damange with sustained load.
  • More time to conduct the run (if your doing a dyno day, 4th just takes longer)

3rd gear
  • Worse engine VE due to going through the RPM's quicker.
  • Greater parasitic losses from gearing due to going through RPM quicker
  • Better Gearing multiplication for torque (but could still be lower thanks to the losses mentioned above)
  • Less Heat built up during shorter runs, less danger.
  • Dyno runs can be done quicker

The end result is, it doesn't matter as long as it's the same for each subsequent run, and that it's documented when you share your dyno so others are aware of the conditions.
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Mr. Tea.. yes that would be the logical explanation
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