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dyno dynamics 

 

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 Post subject: dyno dynamics
Posted: Tue Dec 09, 2008 2:20 pm 
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i had two dyno runs itwo different shops,in the breakdown of what theydid one shop shophad cf:shoot-6f the other hadcf:shoot-6 just wanted toknow what is the differanceas they recorded different results
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Posted: Tue Dec 09, 2008 2:22 pm 
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how different were the results?

 

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Posted: Tue Dec 09, 2008 2:42 pm 
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the results differ by21kw
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Posted: Tue Dec 09, 2008 2:53 pm 
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From what I understand it's a different ramp rate and possibly some sort of correction factor?
Has the car got forced induction to warrant being run in Shoot6F?
If it doesn't, can I guess and say that the 6F figure was lower?

 

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Posted: Tue Dec 09, 2008 5:31 pm 
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it is a typhoon ba and no 6f figure was higher
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Posted: Tue Dec 09, 2008 11:01 pm 
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its just different ramp rates,

 

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Posted: Tue Dec 09, 2008 11:22 pm 
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yeah, look at the bottom two rows of numbers, and tell us the RR: numbers from each run.

 

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Posted: Wed Dec 10, 2008 7:52 am 
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the6f run was rr:015 and the6 wasrr:013 the latter was very good making 356.7kw
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Posted: Wed Dec 10, 2008 7:55 am 
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yeah they run a different correction factor, at many dyno days you will see ppl's results become higher as they change the rate...

 

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Posted: Wed Dec 10, 2008 8:16 am 
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They use RR:15 for Shoot8

It's nothing to do with the correction factor (that's based of the temperature and humidity readings).

The ramp rate, adjusts the resistance the dyno places on the car's wheels, so the speed increase is controlled, and hopefully linear. e.g. with a RR of 15, the dyno will try and limit the cars acceleration to 15km/h per second. The amount of resistance (retardation) required to keep the acceleration in check is used to figure out the power being made.

But when you're talking 21KW difference with over 350RWKW, I'd say that was just the difference in dynos or slight weather differences (the correction factor). Nothing to worry yourself about.

I have dyno sheets showing differences easily that great.

 

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Posted: Wed Dec 10, 2008 8:30 am 
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thanks toall
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