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roflwaffle · 07-04-2016, 02:02 PM

I think the relative definition of load is the percentage of air flow compared to WOT at that engine speed, and the absolute load is the percentage of air flow compared to cylinder displacement, which is like volumetric efficiency.

About PID Calculated Load Value » OBD-II Resource

Here's some good discussion on it.

https://www.physicsforums.com/thread...e-load.703167/

If you have a BSFC map, you can use that load and rpm to figure out engine efficiency.

07-04-2016, 02:02 PM	#11 (permalink)
roflwaffle Master EcoModder Join Date: Dec 2007 Location: Southern California Posts: 1,490 Camryaro - '92 Toyota Camry LE V6 90 day: 31.12 mpg (US) Red - '00 Honda Insight Prius - '05 Toyota Prius 3 - '18 Tesla Model 3 90 day: 152.47 mpg (US) Thanks: 349 Thanked 122 Times in 80 Posts	I think the relative definition of load is the percentage of air flow compared to WOT at that engine speed, and the absolute load is the percentage of air flow compared to cylinder displacement, which is like volumetric efficiency. About PID Calculated Load Value » OBD-II Resource Here's some good discussion on it. https://www.physicsforums.com/thread...e-load.703167/ If you have a BSFC map, you can use that load and rpm to figure out engine efficiency.