What's your A/F on Overrun?, 'Nother D-Jet A/F Question Options

[BeatNavy]

For those with D-Jet, what are you typically seeing for A/F ratio on a medium to hard overrun? Based on what I've read here mine seems too rich - like in 10's and 11's. Once the RPM's drop closer to idle it bounces back up to normal idle A/F ratios. Does A/F on overrun even matter?

[BeatNavy]

Not particularly. That's sort of been the root cause of my continuous futzing with D-Jet recently. It runs well, but mileage is not great best I can tell. With 2056 I've never got better than 20 mpg driving to/from work -- 20 minutes of "parkway" driving which is 95% of what I do. I maybe got closer to 23 to 25 last year going to and from Hershey on the highway. Maybe that's all I should expect (IMG:style_emoticons/default/confused24.gif)

I've swapped out different combos of CHT and with and without spacer recently, and I got leaner, and hotter, after removing the spacer, but interestingly the mileage didn't seem to get better. The spacer I had on the CHT was long - like 23 mm -- and seemed to act more like a ballast resistor and enriched mixture even after warm-up. Today I cut the spacer down some to try to allow good warm-up while still allowing the CHT to get to "operating temp" that's not too rich or lean.

I may be chasing a couple of minor issues...but I wanted to see what a "normal" overrun A/F would be as this hasn't really changed with all the screwing around I've done.

[brant]

Not particularly. That's sort of been the root cause of my continuous futzing with D-Jet recently. It runs well, but mileage is not great best I can tell. With 2056 I've never got better than 20 mpg driving to/from work -- 20 minutes of "parkway" driving which is 95% of what I do. I maybe got closer to 23 to 25 last year going to and from Hershey on the highway. Maybe that's all I should expect (IMG:style_emoticons/default/confused24.gif)

I've swapped out different combos of CHT and with and without spacer recently, and I got leaner, and hotter, after removing the spacer, but interestingly the mileage didn't seem to get better. The spacer I had on the CHT was long - like 23 mm -- and seemed to act more like a ballast resistor and enriched mixture even after warm-up. Today I cut the spacer down some to try to allow good warm-up while still allowing the CHT to get to "operating temp" that's not too rich or lean.

I may be chasing a couple of minor issues...but I wanted to see what a "normal" overrun A/F would be as this hasn't really changed with all the screwing around I've done.

just a point of reference
and I'm not 2056, but rather the stock 1994cc(?)

but I'm averaging 31mpg highway with stock Djet on a stock motor
I purchased the motor used and was told it has a F.I. cam
but really its stock as far as seat of the pants dyno
I did adjust the MPS for richer numbers on this motor using an AF meter

just a point of reference.