Dyno Horsepower Correction

Torque (ftLbs, nm, kgm)
Horsepower (hp, ps, kw)
Temperature [dry] (F, C)
Fahrenheit
Celcius		 Temperature [wet] (F, C)
Fahrenheit
Celcius
Use Dry/Wet bulb for humidity
Station Pressure (inHg, mBar)
inHg
mBar
Humidity (%)
Dyno Altitude (Ft)

Uncorrected SAE J607 SAE J1394 (1990) SAE J1394 (2004)
TQ
HP
Correction Factor 1.000000
Density Altitude (Ft)
Correction Formula None
Accuracy 1.000000
Temp(ref)
Pressure(ref)
Humidity(ref)
TQ
HP
Correction Factor
Density Altitude (Ft)
Correction Formula J607
Temp(ref) 60 deg-F
Pressure(ref) 29.92 inHg
Humidity(ref) 0.00%
Efficiency(ref) 100.0% 
TQ
HP
Correction Factor
Density Altitude (Ft)
Correction Formula J1394
Temp(ref) 77 deg-F
Pressure(ref) 990 mBar
Humidity(ref) 0.00%
Efficiency(ref) 84.75%
TQ
HP
Correction Factor
Density Altitude (Ft)
Correction Formula J1394
Temp(ref) 77 deg-F
Pressure(ref) 990 mBar
Humidity(ref) 0.00%
Efficiency(ref) 85.00%
       
DynoJet STD SAE  
TQ
HP
Correction Factor 1.000000
Density Altitude (Ft)
Correction Formula None
Accuracy 1.000000
Temp(ref)
Pressure(ref)
Humidity(ref)
TQ
HP
Correction Factor
Density Altitude (Ft)
Correction Formula J607 (+)
Accuracy 1.000131
Temp(ref) 77 deg-F
Pressure(ref) 29.92 inHg
Humidity(ref) 0.00%
Efficiency(ref) 100.0% 
TQ
HP
Correction Factor
Density Altitude (Ft)
Correction Formula J1394
Accuracy 1.000040
Temp(ref) 77 deg-F
Pressure(ref) 990 mBar
Humidity(ref) 0.00%
Efficiency(ref) 85.00%
   
   
   
   
   
   
   
       
Dynapack STP SAE (2004) SAE-Adapted
TQ
HP
Correction Factor 1.000000
Density Altitude (Ft)
Correction Formula None
Accuracy 1.000000
Temp(meas)
Pressure(meas)
Humidity(meas)
TQ
HP
Correction Factor
Density Altitude (Ft)
Correction Formula J607
Accuracy 0.999995
Temp(ref) 288.7° K
Pressure(ref) 29.92 inHg
Humidity(ref) 0.00%
Efficiency(ref) 100.0% 
TQ
HP
Correction Factor
Density Altitude (Ft)
Correction Formula J1394
Accuracy 0.999162
Temp(ref) 298.0° K
Pressure(ref) 990 mBar
Humidity(ref) 0.00%
Efficiency(ref) 85.00%
TQ
HP
Correction Factor
Density Altitude (Ft)
Correction Formula J1394
Accuracy 1.000615
Temp(ref) 288.7° K
Pressure(ref) 29.725 inHg
Humidity(ref) 0.00%
Efficiency(ref) 84.75%
       
Uncorrected ISO 1585    
TQ
HP
Correction Factor 1.000000
Density Altitude (Ft)
Correction Formula None
Temp(ref)
Pressure(ref)
Humidity(ref)
TQ
HP
Correction Factor
Density Altitude (Ft)
Correction Formula ISO 1585
Temp(ref) 298.0° K
Pressure(ref) 990 mBar
Humidity(ref) 0.00%
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   

Notes:

+ : J607 with Humidity Correction.  J607 specification formula does not perform humidity correction.  Dynojet version of STD correction does perform humidity correction based on J607 formula.

Summary:

Correction Type Base Formula Accuracy Ref. Temp Ref. Pressure Ref. Efficiency Notes
J607 J607 1.000000 60 deg-F 29.92 inHg 100.00% Normal J607 does not remove effects of humidity.
J1394 (1990) J1394 1.000000 77 deg-F 990 mBar 84.75% All J1394 variants remove effects of humidity.
J1394 (2004) J1394 1.000000 77 deg-F 990 mBar 85.00% Current SAE standard reference formula.
Dynojet STD J607 1.000131 77 deg-F 29.92 inHg 100.00% Uses slightly modified J607 formula by removing effects of humidity.
Dynojet SAE J1394 1.000040 77 deg-F 990 mBar 85.00% Dynojet uses current SAE standard reference formula.
Dynapack STP J607 0.999995 288.7 deg-K 29.92 inHg 100.00% Temperature reference rounded to 59.99 deg-F (288.8 deg-K).
Dynapack SAE (2004) J1394 0.999162 298.0 deg-K 990 mBar 85.00% Temperature reference rounded to 76.73 deg-F (298.0 deg-K).
Dynapack SAE Adapted J1394 1.000615 288.7 deg-K 29.725 inHg 84.75% Standard J1394, but using Dynapack's own reference values.
Dynapack SAE Adapted J1394 1.000615 288.7 deg-K 29.725 inHg 84.75% Standard J1394, but using Dynapack's own reference values.
ISO-1585 I1585 1.000000 298.0 deg-K 990 mBar 100.00% ISO-1585 correction.