Quote:
Originally Posted by Christopher
My question is this - The Fifth wheel is 8000lbs so if I am pulling the mountain pass (Colorado), should I see any difference in temps without the larger exhaust / programer?
|
With a stock exhaust, you should see slightly higher EGT than with a custom performance exhaust system. But with a stock tune, you shouldn't see the 1,250° pre-turbo redline unless you are pedal to the metal all the way to the top of the pass.
Quote:
I am thinking anything under 1000 degrees, for the pyro and anything under 200 degrees, for the transmission is safe.
Would these numbers be correct?
|
Assuming the EGT is pre-turbo, they're certainly safe, but way too conservative for dragging your trailer up I-70 from Denver to the Eisenhower tunnel. You can run all day at 1,200° pre-turbo EGT without hurting anything but your fuel bill. 1,250° pre-turbo EGT is the red line. I would kill OD at the bottom of the grade (while you're still in Denver). Then, traffic allowing, maintain at least 55 MPH up the pass. Watch the pyrometer during pedal to the metal for short stretches of steep sections and see if it gets up to 1,250°. If not, then don't worry about it. But if it gets up to 1,250°, then drive by the pyrometer and don't allow it to exceed 1,250°. You do that by modulating the go pedal a bit - the same way you modulate the go pedal to maintain a certain speed.
And 200° tranny temp is just getting warmed up good. If you can maintain a speed over about 50 MPH up the pass, you shouldn't see over about 210° tranny temp, and that's fine. 225° is the red line, but I wouldn't worry about it until you see about 220°.
If traffic forces you below about 40 MPH while climbing the grade, then the torque converter will unlock and you'll be spewing a volcano worth of heat at the tranny coolers. So in that case, watch that tranny temp gauge, and when it gets over 220°, then look for a place to pull over, stop, and cool off. To cool down the tranny, put it in park and elevate the engine RPM to around 1,200 or 1,300. Then sit there twiddling your thumbs until it cools down to below about 210°. If you have an auxiliary idle controller (AIC), now is the time to use it.
Linear Mode
