Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Blackfly XFi? Geo Metro economy cam shaft swap! Update: swap completed

MetroMPG · 11-28-2007, 01:31 PM

Reconsidering the ECU issue...

One thing the XFi ECU may do to compensate for the different cam profile is adjust timing differently. Higher cylinder pressure would mean more chance of pinging under high load / high temps. So a guess is there may be less advance in the XFi ECU under those conditions.

Something to keep an eye on. Or an ear.

11-28-2007, 01:31 PM	#3 (permalink)
MetroMPG Batman Junior Join Date: Nov 2007 Location: 1000 Islands, Ontario, Canada Posts: 22,541 Blackfly - '98 Geo Metro Team Metro Last 3: 70.09 mpg (US) MPGiata - '90 Mazda Miata 90 day: 54.46 mpg (US) Appliance car Mirage - '14 Mitsubishi Mirage ES (base) 90 day: 51.82 mpg (US) Thanks: 4,085 Thanked 6,988 Times in 3,618 Posts	Reconsidering the ECU issue... One thing the XFi ECU may do to compensate for the different cam profile is adjust timing differently. Higher cylinder pressure would mean more chance of pinging under high load / high temps. So a guess is there may be less advance in the XFi ECU under those conditions. Something to keep an eye on. Or an ear. __________________ Project MPGiata! Mods for getting 50+ MPG from a 1990 Miata Honda mods: Ecomodding my $800 Honda Fit 5-speed beater Mitsu mods: 70 MPG in my ecomodded, dirt cheap, 3-cylinder Mirage. Ecodriving test: Manual vs. automatic transmission MPG showdown EcoModder has launched a forum for the efficient new Mitsubishi Mirage www.MetroMPG.com - fuel efficiency info for Geo Metro owners www.ForkenSwift.com - electric car conversion on a beer budget