Dumb Question

[diesel9973]

Supposedly there is no such thing as a dumb question but here is my dumb question for the day i was wondering what normal egt's are, Normal trans temps and normal boost pressure should be. And what they might be with a superchip programmer? Any info would be helpful.

[SmokeyWren]

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Supposedly there is no such thing as a dumb question but here is my dumb question for the day i was wondering what normal egt's are, ...

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For a stock engine, "normal" pre-turbo EGT can vary from about 500 to 600 cruising unloaded on level ground, to around 900 to 1000 when you climb a hill at higher speed. Tie onto a heavy trailer, and 700 to 800 is normal on the flats, 1,000 to 1,100 when climbing hills, and 1,200 to 1,250 when pedal to the metal up a mountain pass.

Add a mild towing chip, or a programmer in the tow mode, and expect only a bit higher EGT. However, whereas most stock engines won't easily exceed the 1,250 EGT red line, and chip or programmer setting will let you easily go above 1,250. So you must have a pre-turbo pyrometer, then drive by that gauge and never allow more than 1,250 pre-turbo EGT.

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...Normal trans temps

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Assuming your sender is in the pressure port on the side of the tranny, then anything below 200º is normal. Most often your tranny temp will be about 70 to 80 over ambient temp, but anything between 60 to 90 over ambient temp is considered "normal"

About 200 to 225 is the "pay attention" zone. Your tranny is getting hot. Probably because of an unlocked torque convertor and too-slow speed to make the tranny coolers work efficiently.

225 is the red line. Don't go there. [img]/ubbthreads/images/graemlins/cool.gif[/img]

A chip or programmer should not affect tranny temp enough to worry about.

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and normal boost pressure should be.

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On a stock engine, boost tracks with EGT to a great extent. 600 EGT will be around 4 to 7 PSI boost. 1,000 EGT will be 9 to 12 boost. 1,200 EGT will be around 17 PSI of turbo boost (manifold pressure)

But add a chip or programmer and boost can climb up in a hurry. With a stock turbo, 25 PSI is the red line. So drive by the gauges and don't allow more than 25 PSI boost.

[pam622]

Smokey,

Thanks for the info... I recently ordered both an EGT and BOOST gauge kit and have been wondering similar things.

I am still learning a lot about all this and you have helped often.

Pad

[Alabamatoy]

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So you must have a pre-turbo pyrometer, then drive by that gauge and never allow more than 1,250 pre-turbo EGT.

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My 01 regularly runs 1300+, pulling trailer on hills. Seems to run fine. This truck has no engine modes that should effect EGT.

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