TwinTurbo.NET: Nissan 300ZX forum - Always STD to show higher WHP....
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Subject Always STD to show higher WHP....
     
Posted by NIVO88T on November 07, 2014 at 5:29 PM
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In Reply To Recent Dyno Results posted by Lumpydonut on November 04, 2014 at 01:12 PM
     
Message Uncorrected is what the car actually put down that day on the dyno with the weather effects on the dyno. But dyno on another day or later that day and the power will change with the current atmospheric changes, weather.

This is why Dynamometers use correction factors, to standardize the weather to one set of parameters and the readings can be repeatable!

I see your dyno has the older STD J607 on it.


STD J607 is a very old correction factor standard and now the common norm is the SAE J1349 correction factor standard which was revised I believe in 2011. And keeps being revised.

There is a WHP difference between STD and SAE. STD is higher.

322 whp is decent horsepower.

Conditions in SAE correction:
Air Temperature: 77F
Absolute Pressure: 29.23 inches Hg
Relative Humidity: 0%
Relative Horsepower : 100%
Air Density: 1.157kg/m3
Relative Air Density: 94.4%
Density Altitude: 1952 feet
Virtual Temperature: 77F
Vapor Pressure: 0 inches Hg
Dyno Correction Factor: 1

Conditions in STD correction:
Air Temperature: 60F
Absolute Pressure: 29.92 inches Hg
Relative Humidity: 0%
Relative Horsepower : 104.8%
Air Density: 1.223kg/m3
Relative Air Density: 99.8%
Density Altitude: 67 feet
Virtual Temperature: 60F
Vapor Pressure: 0 inches Hg
Dyno Correction Factor: .955

     
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