FATS to ave HP and 60-90 MPH Converter Graph
10-02-2005, 12:43 PM
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FATS to ave HP and 60-90 MPH Converter Graph
<center><img src="http://pictureposter.audiworld.com/44443/fats_to_hp_and_60-90_mph.jpg"></center><p>I have heard a fair amount of stuff lately about how FATS is related to standard benchmarks like 60-90 MPH or HP. This graph shows the relationship between FATS time, road horsepower, wheel horsepower and crank HP as well as 60-90 MPH time all in one place. It is based on the average HP over the 4200-6500 FATS RPM range. For example, If you have a 5 sec FATS time, then the 60-90 MPH time would be about 4.5 sec and your average wheel horsepower over 4200-6500 RPM range on a dyno should be about 268 WHP.
There are three kinds of HP curves on this graph:
RHP- Road Horsepower measured with FATS or Gtech
WHP- Wheel Horsepower measured with dyno
CHP- Crank Horsepower
An example of the defintion of Ave HP is show in the link below. Note that the previous GIAC-X puts out about 274.5 HP peak on my car, but only 257.9 HP averaged over 4200-6500 RPM range. It is easiest to average the HP over the RPM range if you have the source data, but could be eyeballed from dyno graphs.
Bruce<ul><li><a href="http://pictureposter.audiworld.com/44443/bej_s4_giac-x_vs_aprv5_041205_adj.jpg">Sample HP curves showing average and peak HP</a></li></ul>
There are three kinds of HP curves on this graph:
RHP- Road Horsepower measured with FATS or Gtech
WHP- Wheel Horsepower measured with dyno
CHP- Crank Horsepower
An example of the defintion of Ave HP is show in the link below. Note that the previous GIAC-X puts out about 274.5 HP peak on my car, but only 257.9 HP averaged over 4200-6500 RPM range. It is easiest to average the HP over the RPM range if you have the source data, but could be eyeballed from dyno graphs.
Bruce<ul><li><a href="http://pictureposter.audiworld.com/44443/bej_s4_giac-x_vs_aprv5_041205_adj.jpg">Sample HP curves showing average and peak HP</a></li></ul>
10-02-2005, 12:54 PM
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Interesting. As far as I can tell, that seems to jive with most of Nyet's HP estimates.
The difference is that you guys use a weight ~3800, whereas I bet my car with me in it is ~3650.
10-02-2005, 01:29 PM
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2nd. Standard weight for most people excluding Doc and people with stripped interiors should be..
close to 3800 lbs. It's just a spreadsheet, I can generate these curves for any vehicle weight.
Bruce
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10-02-2005, 02:39 PM
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Umm, no. My car has weight reduction and probably weighs ~3500 with no driver.
lighter cat-back exhaust, lighter DPs, lighter brakes, lighter wheels, no spare, lighter battery, etc, etc etc.