Hi,
I want to do a couple of things to the engine,
Advance auto parts advertised a 195F thermostat for $13., stock is 185F, 82C. But when I got it home I noticed it said 188F on the box, so I returned it. Bummer, the advertisement and listing is wrong. Saturns have a weird thermostat, like no other, so a regular type won't work.
I also bought a bosch wide range o2 sensor. If the threads fit, I plan to try to get the engine to run lean burn in closed loop by biasing the pump leads with a potentiometer. I don't know If I will have to advance the ignition timing by playing with the map sensor, does any one know how much more the advance should be when in lean burn mode?
... I got the car to run lean with the adjustable potentiometer, but I have a pending code P1133. Need more testing.
... Looking at the flame speed vs equivalence charts, The flame speed is approximately the same for equivalence of 1 and 1.2. So It looks like I can run about 18:1 to 19:1 fuel air ratios with the stock ignition timing. Maximum efficiency for lean burn gasoline engines is near 1.4.
