My s13 has a redtop SR swap that was previously in a RHD s14 track car and who knows what all else before that. It came with a fatty o2 sensor installed, but I swapped in a skinny o2 sensor from my buddy's used parts bin because I thought it was the right thing to do since I have a 62 ECU.
I recently got a Consult cable and ECUtalk software plus OBD Scantech (trial) software. According to ECUtalk, my o2 sensor has zero voltage. However, it says my friend Scott's redtop SR does have a voltage reading (62 ECU and skinny o2 as well). I tested another friend's SR, but it's an s14 SR with a fatty o2 sensor, so I assume that that's why it displayed the typical voltage cycling that most oxygen sensors do.
I thought my gas mileage got a little better when I switched to the skinny o2, but I wasn't sure. If I baby it down the interstate, I get about 300 miles to a tank, maybe 330, but 18's plus low-pro tires make my speedo read a little high, and I would think it should be getting way more miles than that anyway. I assume it should be about 500 miles if it's getting around 29 mpg on straight up long distance interstate driving (which I do often).
Also, I deleted my knock sensor with a 1 megaohm .5 watt resistor since the knock sensor was bad. The SR has never quite seemed as fast as I thought it should be (stock t25g, FMIC, exhaust, roughly 9psi), but I'm really not sure. I assume that an improper knock sensor signal will pull timing and cause it to feel weaker, but when I compare the datalogs of my timing to the datalogs of my friend Scott's datalogs (same mods, redtop SR), they look almost identical.
My knock sensor is "deleted" and doesn't throw any codes, and his knock sensor is bad/unplugged and actually throws the code immediately and every time. Perhaps I used the wrong resistor? Maybe .5 watt isn't correct? Maybe the signal is wrong enough to make the engine pull timing as if it was detecting knock, but not too wrong to the point where it throws the knock sensor error code? When I deleted the knock sensor, I wired the 1M ohm . resistor in by snipping the knock sensor wire about 6 inches from the computer, then putting in the resistor then putting the other end to ground right there near the ECU mount.
Here's some screenshots of the datalog results.
me = Casey, my friend = Scott (just to prevent any confusion lol)
I appreciate any help/insight you guys have to offer!