Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - subaru Impreza: lean burn and valve lift experiment

ever_green · 01-23-2015, 04:12 AM

Thanks for the reply. I read The 1986 Bosch handbook which says best BSFC is experienced at 1.1 lambda with PFI engines. The 2011 edition says "1.2 - 1.5" (PFI) and "up to 4.0" (DI)!

I'm not sure where I can find a road like that. Its quite hilly here. I have added about 10* of timing and set my lambda 1 to 16.7 AFR to start with.

I run this lean between 2000-3000 RPM under cruising conditions (0.3-0.6 g/rev VE) so long as in low valve lift mode. Here are the change

I will be testing this tomorrow. Oh by the way these are the non egr timings. I will do EGR after leanburn. I think the EGR will also protect the catalyst by cooling the intake charge and hence exhaust. Not sure how much hotter this AFR runs.

01-23-2015, 04:12 AM	#3 (permalink)
ever_green Master EcoModder Join Date: May 2011 Location: Toronto Posts: 264 gueff - '19 Mercedes Benz A250 4MATIC AMG 90 day: 30.55 mpg (US) Thanks: 8 Thanked 79 Times in 33 Posts	Thanks for the reply. I read The 1986 Bosch handbook which says best BSFC is experienced at 1.1 lambda with PFI engines. The 2011 edition says "1.2 - 1.5" (PFI) and "up to 4.0" (DI)! I'm not sure where I can find a road like that. Its quite hilly here. I have added about 10* of timing and set my lambda 1 to 16.7 AFR to start with. I run this lean between 2000-3000 RPM under cruising conditions (0.3-0.6 g/rev VE) so long as in low valve lift mode. Here are the change I will be testing this tomorrow. Oh by the way these are the non egr timings. I will do EGR after leanburn. I think the EGR will also protect the catalyst by cooling the intake charge and hence exhaust. Not sure how much hotter this AFR runs.