Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - My car is too eager to switch to open loop

RobertSmalls · 01-23-2009, 01:45 PM

Sure I want to modify it. The engine management software is desperately afraid of stalling, and it's built to endure things like 10W30. I want my ECU to live on the edge a little.

This chart, from a paper by Subaru, shows my engine's BSFC (in grams of gas per horsepower-hour), which is what I need to minimize to get the most oomph out of a gallon. The chart leads to two conclusions: revs bad, using the engine near its capacity at a given RPM good. The latter is achieved with throttle.

I know the above plot represents what the engine is capable of. What I'm not sure of, is whether their test used the same ECU I have. Oh, if I only had a dyno and a laptop-based OBDII data acquisition setup.

01-23-2009, 01:45 PM	#3 (permalink)
RobertSmalls Left Lane Ecodriver Join Date: Aug 2008 Location: Buffalo, NY, USA Posts: 2,257 Prius C - '12 Toyota Prius C Thanks: 79 Thanked 287 Times in 200 Posts	Sure I want to modify it. The engine management software is desperately afraid of stalling, and it's built to endure things like 10W30. I want my ECU to live on the edge a little. This chart, from a paper by Subaru, shows my engine's BSFC (in grams of gas per horsepower-hour), which is what I need to minimize to get the most oomph out of a gallon. The chart leads to two conclusions: revs bad, using the engine near its capacity at a given RPM good. The latter is achieved with throttle. I know the above plot represents what the engine is capable of. What I'm not sure of, is whether their test used the same ECU I have. Oh, if I only had a dyno and a laptop-based OBDII data acquisition setup.