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brucepick · 04-15-2010, 12:13 AM

moonmonkey -
Actually I have a SG too, I got that first.
The MPGuino requires tapping into the car's wiring to get a signal so it's a much tougher installation than the SG. I was leery of that but mobythevan gave me the tips I needed.

The Civic HX is one of the few cars where you won't get a real mpg readout on a ScanGauge. So I use the SG as a tool to maintain Lean Burn as much as possible. Its GREAT for that! And now the MPGuino to read actual mpg.

My HX has lean burn, which means the air-fuel ratio does not stay at stoich (14.7:1??). The ScanGauge assumes stoich. It gets air volume data from the ECU, assumes stoich, and so derives fuel qty. Also gets a signal if its in open or closed loop so I believe it can compute for rich running in open loop. It doesn't read injector squirts like the MPGuino does. With lean burn the SG always has errors. Since you can only guess how much of the time you're in lean burn you can't really get an accurate mpg readout from a SG for an HX or for any Honda with lean burn (I think the original Insight had it too).

Sorry - gotta go. Getting up in 6 hours for work!

04-15-2010, 12:13 AM	#3 (permalink)
brucepick OCD Master EcoModder Join Date: Dec 2007 Location: Eastern CT, USA Posts: 1,936 Outasight - '00 Honda Insight Team Honda Gen-1 Insights 90 day: 54.18 mpg (US) Thanks: 431 Thanked 396 Times in 264 Posts	moonmonkey - Actually I have a SG too, I got that first. The MPGuino requires tapping into the car's wiring to get a signal so it's a much tougher installation than the SG. I was leery of that but mobythevan gave me the tips I needed. The Civic HX is one of the few cars where you won't get a real mpg readout on a ScanGauge. So I use the SG as a tool to maintain Lean Burn as much as possible. Its GREAT for that! And now the MPGuino to read actual mpg. My HX has lean burn, which means the air-fuel ratio does not stay at stoich (14.7:1??). The ScanGauge assumes stoich. It gets air volume data from the ECU, assumes stoich, and so derives fuel qty. Also gets a signal if its in open or closed loop so I believe it can compute for rich running in open loop. It doesn't read injector squirts like the MPGuino does. With lean burn the SG always has errors. Since you can only guess how much of the time you're in lean burn you can't really get an accurate mpg readout from a SG for an HX or for any Honda with lean burn (I think the original Insight had it too). Sorry - gotta go. Getting up in 6 hours for work! __________________ Coast long and prosper. Driving '00 Honda Insight, acquired Feb 2016. Last edited by brucepick; 04-16-2010 at 08:27 PM..