Been meaning to post here more, but it's the busy season at work, and I'm working hard to refill my wallet.
Since I took the motor out, my air pump has been missing. I've been driving the car around and just assuming the tires still had a lot of air in them, because hey, I always put 45+ PSI in them. The pump turned up yesterday though, and I found I had TEN PSI (10 PSI)
00001010 PSI in one of my tires, and all of them were below 30, which might have contributed to why my fuel economy has been so poor.
The other part of that has been idling and messing with engine tuning.
I spent some time last weekend getting cruise control installed, and woe is anyone else who ever has to work on any of the electrical systems in this car who doesn't remember what I've done. I'm 95% done tying my old Rostra unit into the S2000-RSX clockspring and steering wheel button combination I cobbled together.
Ended up tossing out the engine tune I was working on and started over. So far I've spent the last few days taking the highway route to work and holding various throttle positions (sometimes causing me to rapidly accelerate from 45 to 75) to collect data points on how far the ECU has to correct the fuel maps to get to 14.7:1 AFR. Right now I have all load and RPM below VTEC engagement set to 30 degrees intake cam advance and I'm adding and subtracting fuel to get the trims down to 0%. Next I'll do 20, 40, 10 and 0 degrees to get a completely correct fuel map for all possible cam positions, to the nearest 10 degrees, then interpolate them. Once that's done, I'll start playing with lean burn, but I don't want to start leaning things out until I have my fuel maps correct( which scale with target AFR) as I don't want AFR swinging wildly whenever I move the gas pedal.
So far I've discovered the car does
not handle super low RPM with 30 degrees of advance - it stumbles quite a bit in some areas. However, I'm also finding patches where fuel usage (and power) are considerably lower. My hypothesis is that these are areas where volumetric efficiency is very low and/or I'm getting exhaust gases pulled back into the cylinder. If I find and select
FOR these areas at part throttle operation, I can get engine load up.
