I'm curious what you consider a high temperature in your transmission? Even running with a 195 degree thermostat, with the pressure from the radiator cap givng you an extra 2 degrees per psi, normal operating engine temp is really close to 225 degrees running a 50/50 mix of anti-freeze. A trans temp of 180-190 degrees is quite normal and within operating ranges for your fluids.
The trans runs between 150 - 195 depending on traffic, city v. highway, etc.
I know with the 160 installed, with the factory cooler, the trans temp rarely got above 150.Maybe it is within operating specs, but I wanna try this out to see if there is much of a difference.
I recall you saying you car ran better and got better MPG after running factory T-Stat?
180 Degrees is the Operating temp of the 42LE. Do you have a extra external cooler besides the factory one?
170 Degree Thermostat in a car designed to run 190 ish just sounds too cold with no yet proven gains.
My mileage right now in the city is ~ 16 mpg. Which is what I mainly drive. My theory is that with the 170 installed, it will be close enough to the 180 that nothing will be affected but perhaps the trans temperatures. It is untested, and unproven at this point, but I have been curious about this for years, testing it is no big deal IMO.
Indeed, what are your trans operating temps? That has little to do with engine operating temps.
Our discussion basically consisted of the engine not reaching its designed operating temp, resulting in poor fuel trims, O2 readings, etc...How do you know little has changed, have you had it scanned again?
Also, thats not how the thermostat fits in the housing...its backwards...just in case lol.
I have scanned it with my Alex Peper OBDII scanner. I am seeing between 8-11 degrees of timing advance @ idle. Pretty much the same thing Ross saw. The LTFT's and STFT's were off, but I need to rescan to verify.
Yeah, I looked at the t-stat again, and got it in the right way!!