EcoModder Forum SGII Horsepower gauge & related gauges

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 02-26-2009, 12:28 AM #1 (permalink) Left Lane Ecodriver     Join Date: Aug 2008 Location: Buffalo, NY, USA Posts: 2,257 Prius C - '12 Toyota Prius C Thanks: 79 Thanked 286 Times in 199 Posts SGII Horsepower gauge & related gauges I followed the instructions in the manual for creating a Horsepower gauge in my 1996 Subaru Legacy. The output of said gauge is about 30% higher than what would be plausible. It was showing something like 30BHP cruising around at 49mph. At redline and 80% throttle, it was showing 165BHP, while my engine is only rated for 135. So, how does the SG calculate HP? It's obviously doing it wrong. Can I get it to multiply by a constant calibration factor? Also, if a working HP gauge could be made, you'd probably want a few related gauges: BSFC gauge = BHP/GPH, showing how many milligrams of fuel per second it takes you to make a horsepower. Torque gauge = BHP/RPM, because that would be cool.
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 03-02-2009, 09:08 PM #2 (permalink) Left Lane Ecodriver     Join Date: Aug 2008 Location: Buffalo, NY, USA Posts: 2,257 Prius C - '12 Toyota Prius C Thanks: 79 Thanked 286 Times in 199 Posts Or does anyone at least know how (or whether) I can take Gauge X and divide by Gauge Y and display the output as Gauge Z?
 03-02-2009, 10:43 PM #3 (permalink) Master EcoModder   Join Date: Jan 2009 Location: Maui, Hawaii Posts: 813 Thanks: 5 Thanked 34 Times in 26 Posts Check the coding manual ScanGaugeII - Add-A-Gauge
 03-03-2009, 10:20 AM #4 (permalink) Left Lane Ecodriver     Join Date: Aug 2008 Location: Buffalo, NY, USA Posts: 2,257 Prius C - '12 Toyota Prius C Thanks: 79 Thanked 286 Times in 199 Posts Ah, so I see the answer is no, that can't be done. The MTH field doesn't let you multiply or divide by a gauge or a data stream, just by a constant. Although the stock mpg and cpm gauges involve division of one data stream by another, I don't see any way to add such gauges to the SGII, so I suppose the BSFC gauge is never going to happen. :-( I see the stock Horsepower gauge has a multiplication by 4.35 built in. I could correct this value to make it accurate at at least one point on the torque vs. RPM curve, but I don't know what method the SG uses to calculate HP, and I'm skeptical about its accuracy.