EGT's, RPM's, and MPG's - Ford Powerstroke Diesel Forum
 
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post #1 of 3 Old 08-23-2010, 03:43 PM Thread Starter
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EGT's, RPM's, and MPG's

Here's my theory - is it full of baloney? I was thinking that i should drive with an eye for maintaining the lowest EGT's. Even if the RPM's are higher with Overdrive off that would mean less fuel is being used.

When I load my camper and head for the hills i weigh at least 11,000 pounds. i noticed when going up hills that i can turn off the Overdrive and let the RPM's go higher, and the EGT's decline quite a bit almost right away.

For example: Overdrive On and a steady highway hill climb makes about 1100 degree EGT's and 2000 RPMs.

If i turn off the Overdrive the RPM's jump up to 2500 when it downshifts, but the EGT's decline down to about 950.

Those are guesstimates since i can't remember the exact numbers from the last trip.

I don't recall seeing the transmission temp change either way.

Which is the wiser way to drive?

Early 99 (7/98) F-350 CC 4X4 AT 7.3L 200K mi - 4" turbo back w/muffler - AFE Stage 2 - PMT1 ECM - DP 40T/DECEL/80E - dual trans coolers - HPX - Fuel CCK - Auto Meter Trans/EGT/Boost - 3.73 - stock tires

Last edited by samiam; 08-23-2010 at 04:00 PM.
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post #2 of 3 Old 08-23-2010, 03:54 PM
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Well I think the reason your EGTs are going down is because you are making more and more boost. And in order to make more boost it takes more fuel. So I dont know if it will help with MPG or not.
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post #3 of 3 Old 08-23-2010, 04:10 PM Thread Starter
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shoot i can't remember what the boost numbers were. and i'm always watching boost when i'm loaded up because it really moves then.
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Originally Posted by Mikey's250 View Post
Well I think the reason your EGTs are going down is because you are making more and more boost. And in order to make more boost it takes more fuel. So I dont know if it will help with MPG or not.

Early 99 (7/98) F-350 CC 4X4 AT 7.3L 200K mi - 4" turbo back w/muffler - AFE Stage 2 - PMT1 ECM - DP 40T/DECEL/80E - dual trans coolers - HPX - Fuel CCK - Auto Meter Trans/EGT/Boost - 3.73 - stock tires
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