Exhaust Temperature
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Junior User
Joined: Feb 2012
Posts: 61
Likes: 1
From: Chaplin, Ky
Exhaust Temperature
What's the normal range for exhaust temperature on a IDI turbo? When I kick the turbo up to around 5 or more psi (according to the Hypermax gauge) the exhaust temperature quickly climbs to around 1200 degrees (according to the same Hypermax gauge).
Elder User
Joined: Dec 2011
Posts: 751
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From: Kodiak, Alaska
! Turn your fuel down, make sure your cdr isn't blowing oil into your air intake, that is where I would start.
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Joined: Sep 2011
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From: Camden
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Elder User
Joined: Dec 2011
Posts: 751
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From: Kodiak, Alaska
Soak it in gas overnight I would guess carb cleaner would work good too. It gets gummed up with oil residue and will spit oil out instead of just venting your crank case gasses and letting the oil drain back into the engine
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Cargo Master
Joined: Feb 2010
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From: NY
Soak it in kerosene is the proper thing to do. Gas will rupture the seals.
I am going to be the odd ball and say injection pump timing is your issue. A engine running that hot and only making 5 psi is a problem. You may be too advanced.
Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
If your thermocouple is in the drivers side exhaust manifold near #8 (I put mine in the collector between the bend and flange) 1100 is a good number to hold, though you can go up to 1200 degrees for short stints, do not allow it to get to 1250 for any length of time, quick burst ok, don't hold it there!
Better off just keeping it below 1200 ...
Have you ever pulled a load ??
That is one of the best DIY methods to test&tune., underload, full boost, you should barely see a haze out the pipe, if you see black you're EGT's will climb and you need to turn the IP down a touch or cleanup the air in and air out paths! It's crying for more air.
And running around flat lander style slowing down and stomping on it (getting on a freeway) don't tell ya squat! You need to pull a long grade and make it work for a period of time, more time better accuracy.
Stopping to cool the EGT's is pointless, Reduce the fuel (let up a little on the go pedal), down shift if ya need, but keep on trucking! Keep that air flowing.
Next stop turn your IP down a tad.
-Enjoy
fh : )_~
Better off just keeping it below 1200 ...
Have you ever pulled a load ??
That is one of the best DIY methods to test&tune., underload, full boost, you should barely see a haze out the pipe, if you see black you're EGT's will climb and you need to turn the IP down a touch or cleanup the air in and air out paths! It's crying for more air.
And running around flat lander style slowing down and stomping on it (getting on a freeway) don't tell ya squat! You need to pull a long grade and make it work for a period of time, more time better accuracy.
Stopping to cool the EGT's is pointless, Reduce the fuel (let up a little on the go pedal), down shift if ya need, but keep on trucking! Keep that air flowing.
Next stop turn your IP down a tad.
-Enjoy
fh : )_~
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Junior User
Joined: Feb 2012
Posts: 61
Likes: 1
From: Chaplin, Ky
Why do people turn up the pump, for more power? This truck doesn't seem to have am abundance of power. Not that its lacking, its just not overly powerful. But the last Ford I owned was a supercharged 406 HP Lightning. The turbo gauge hardly ever moves off zero unless I floor it then 5 or 6 psi is the best it will do.
Fleet Mechanic
Joined: Jan 2011
Posts: 1,709
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From: 8600 ft in Colo
Turning up the pump adds more fuel. With a turbo adding more air, more fuel can be burned... Max power is achieved by having as much fuel as can be burned efficiently, within exhaust temp limits. As Festus said, 1200 degrees is a good limit, assuming an accurate pyrometer, with the thermocouple in the back of the exhaust manifold.
Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
Yup, More fuel means more heat, more heat means more power, but you have to have the oxygen to burn that fuel in the cylinder, not in the pipes raising EGT's ...
Don't know personally, though I understand the Hypermax is not the greatest Turbo package, it works ... It's not waste gated so you can't make it built boost at low RPM without over boosting at high RPM's. Thus the low boost numbers.
5 or 6 psi does really wake these trucks up compared to a N/A motor.
-Enjoy
fh : )_~
Don't know personally, though I understand the Hypermax is not the greatest Turbo package, it works ... It's not waste gated so you can't make it built boost at low RPM without over boosting at high RPM's. Thus the low boost numbers.
5 or 6 psi does really wake these trucks up compared to a N/A motor.
-Enjoy
fh : )_~