Quote:
Originally Posted by kafer65
I hear that the narrow bands are impossible to tune by since they swing so quickly it just becomes too noisy to work with. Ten years ago I could introduce a resistor into the wiring of the oxygen sensor to make it a blunt instrument.
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Yea like I said, what you need is to plug in a wideband sensor and a narrowband emulator. Costs around 200 but it'll definitely pay for itself within a few years in gas savings in most cases, though it obviously works best if you have the hardware to tune the ECU already so you can adjust the maps appropriately.
Update, -25 is the most the intake cam will move, I tried putting -40 into the table but it only gave me -25, so -25 it is. I attempted to add exhaust timing to increase EGR but it started stumbling at 2000rpm in neutral! I kept 5 degrees in the cruising load range cells because I figure the intake cam is retarded enough to make it work.
My gas + ethanol blending experiments are progressing pretty well, I had about 4.5 gallons left in the tank which was like 30% E85, the rest was 91. I filled the tank all the way with 89 (8.5 gallons or so) reducing the ethanol content down to probably something like 17%, and still zero knock detected at max load
. I basically overpaid around 25 cents in fuel energy content for the E85 but got a whole ~92 octane tank for over a dollar less than a full tank of 91. Good tradeoff.
It's too bad the E85 station I fill at has very expensive gas prices, otherwise I could do 20% E85 + 80% 87 blends conveniently and at lower cost for the E85.