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Concrete · 05-04-2009, 01:40 AM

Dear Mr. Noob

determining ball park parasitic loads is not too hard with instrumentation
I just pulled the serpentine and watched the scan gauge

~.1 GPH difference without any belt (from 900-3000 RPM pretty flat)
~.1 GPH difference A/C on and off (idle)
~.12 GPH difference steering wheel still vs. loaded against the stops (idle)
~.01 GPH difference head lights on and off (maybe)

Note: I could barely tell the head lights were on or off
- thus most electrical loads would be smaller and even more insignificant

during the test my unloaded consumption was ~.46 GPH
parasitic load can be 70% of my idle load and 10-20% of my cruise load

Hope this is helpful,

05-04-2009, 01:40 AM	#17 (permalink)
Concrete Sequential Join Date: Jun 2008 Location: Kansas Posts: 177 The Truck - '00 Chevy S10 Extended Cab 90 day: 22.47 mpg (US) Thanks: 0 Thanked 22 Times in 7 Posts	Bit O'Data Dear Mr. Noob determining ball park parasitic loads is not too hard with instrumentation I just pulled the serpentine and watched the scan gauge ~.1 GPH difference without any belt (from 900-3000 RPM pretty flat) ~.1 GPH difference A/C on and off (idle) ~.12 GPH difference steering wheel still vs. loaded against the stops (idle) ~.01 GPH difference head lights on and off (maybe) Note: I could barely tell the head lights were on or off - thus most electrical loads would be smaller and even more insignificant during the test my unloaded consumption was ~.46 GPH parasitic load can be 70% of my idle load and 10-20% of my cruise load Hope this is helpful, __________________ Concrete Start where you are - Use what you have - Do what you can.