Ok this is the point where I need help. while trying a bunch different things with neptune I still cant get my mpg where I want it. The best archived was 43mpg. The tune started in neptune as the "stock P28" tune and i have played with the primary low cam fuel and the primary low cam ignition. closed loop has been disabled.
Am I missing something? All help is greatly appreciated!
That was me. I wast sure what forum you were still active on. Your build is the one that inspired me. I fallowed it on d-series.org also.
I don't post to much on the other forum anymore. I tend to hang out here.
Anyway your car should be doing a whole lot better?
A couple things I would check is make sure you cam is not off a tooth. I would put your crank pulley at tdc and pull number one spark plug. Then get a long screw driver and insert it into the spark plug hole. Put the car in 4th gear and while watching the screw driver move the car back and forth until the screw driver sits at its highest point. Then look to make sure your cam is on its marks. Out of four D series Hondas I have purchased only one had the cam timing correct.
If everything checks out then put the spark plug back in and make sure your timing is correct with a timing light. The timing light and Neptune should read the same.
Did you add more timing while you were tuning at light load? I had to run around 42* advance @ 18.5 A/F with the non-prechamber D15.
Also I would set your individual fuel trims to 0 1 1 0
Does the car seem to have good power and does it idle smooth???