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wmjinman · 11-13-2012, 05:04 AM

I found the BSFC thread on here and read the whole thing. Verrrrrry interesting. Fortunately, there was a chart for the GM 4.3 liter Vortec V-6, which is what my Jimmy has. Looks like I'm best at between 2000 and 2800 rpm, with 2800 being the best, but VERY close through that whole range. Guess that supports my wide range of "good" speeds going up that hill.

I also noted "Old Mechanic" said a simple vacuum gauge will tell you a lot - keep it between 1 and 2 inches of vacuum and between 1500 and 2500 RPM (I guess that would be 2000 and 2800 in my case), and you'll get your best BSFC. I'll have to re-read the ScanGauge instructions & see if I can get manifold vacuum on it. If so, I'll have to start looking at that. If not, maybe I'll just have to go out & buy a vacuum gauge!!

This is exciting - learning new stuff!! I'd love to hit 35 MPG in that thing. I thought I might hit 33 today, but only got to a best of 32.9 on the "current trip"

11-13-2012, 05:04 AM	#13 (permalink)
wmjinman Master EcoModder Join Date: Oct 2012 Location: Carson City, Nevada Posts: 612 Jimmy - '00 GMC Jimmy SLT 90 day: 21.18 mpg (US) The White Gnat - '99 Suzuki Swift Team Suzuki 90 day: 51.87 mpg (US) Thanks: 240 Thanked 114 Times in 90 Posts	I found the BSFC thread on here and read the whole thing. Verrrrrry interesting. Fortunately, there was a chart for the GM 4.3 liter Vortec V-6, which is what my Jimmy has. Looks like I'm best at between 2000 and 2800 rpm, with 2800 being the best, but VERY close through that whole range. Guess that supports my wide range of "good" speeds going up that hill. I also noted "Old Mechanic" said a simple vacuum gauge will tell you a lot - keep it between 1 and 2 inches of vacuum and between 1500 and 2500 RPM (I guess that would be 2000 and 2800 in my case), and you'll get your best BSFC. I'll have to re-read the ScanGauge instructions & see if I can get manifold vacuum on it. If so, I'll have to start looking at that. If not, maybe I'll just have to go out & buy a vacuum gauge!! This is exciting - learning new stuff!! I'd love to hit 35 MPG in that thing. I thought I might hit 33 today, but only got to a best of 32.9 on the "current trip"