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So I installed my exhaust temperature gauge and probe last weekend. It was a rather involved process which included removing the turbo and exhaust manifold. I drilled and tapped the bottom of the manifold near the turbo to accept the probe. All in all it was simple enough, just time consuming.
Anyways, the gauge is reading pretty high. Much high than I would expect. At idle it stays between 350 and 400F. Cruising at 55 to 60mph it says about 1100F. I have had it as high as 1250F on acceleration. Pretty sure there is nothing actually wrong with the motor. It's running strong, with no problems for the past 30k miles. Not even the CEL is on and, no, it's not burnt out or disabled. I was wondering who else has a pyrometer, what kind of readings are you getting, and where exactly did you mount the probe?

Author:	NW CRD [ Sun Oct 31, 2010 9:33 pm ]
Post subject:	Exhaust Temps
So I installed my exhaust temperature gauge and probe last weekend. It was a rather involved process which included removing the turbo and exhaust manifold. I drilled and tapped the bottom of the manifold near the turbo to accept the probe. All in all it was simple enough, just time consuming. Anyways, the gauge is reading pretty high. Much high than I would expect. At idle it stays between 350 and 400F. Cruising at 55 to 60mph it says about 1100F. I have had it as high as 1250F on acceleration. Pretty sure there is nothing actually wrong with the motor. It's running strong, with no problems for the past 30k miles. Not even the CEL is on and, no, it's not burnt out or disabled. I was wondering who else has a pyrometer, what kind of readings are you getting, and where exactly did you mount the probe?

Author:	Granahan378 [ Sun Oct 31, 2010 10:00 pm ]
Post subject:	Re: Exhaust Temps
Those are perfectly fine temps, I dont like going over 1350 for very long but i dont think there are any tunes/tuners that increase temp that high. Anything over 1400 be very careful......air intakes, and lower back pressure in the exhaust are key to lower egt's but you can get much more involved but then again im not sure whats available for the 2.8L.

Author:	Glend [ Mon Nov 01, 2010 1:22 am ]
Post subject:	Re: Exhaust Temps
The temps measured do vary slightly depending on where you put the Pyro probe. My probe is located in the exhaust manifold near the turbo inlet. I have had mine in place for over nine months, so I have measurements before the GDE ECO TUne and after. In my experience EGT goes down after the ECO tune (probably a reduction in over-fueling situations). My Prosport memory gauge shows a peak of 1150F, and that was in on a hot day when I was towing my campertrailer in hilly terrain into a headwind. In normal highway driving I have usual peaks around 800- 900F, but again this depends on the terrain. I can keep the EGT below 600F through light throttle driving around town. The temp you see is very much a function of your right foot, thus the relationship with fuel economy. I have noticed another factor affecting EGT which I really can't explain, different oils used in the engine can boost EGT by 50-100F especially at the lower range. For some reason some synthetic oils raise the EGT over the levels shown when running semi-synthetic oil. No idea why this is so, is it the additive package?

Author:	racertracer [ Mon Nov 01, 2010 3:55 am ]
Post subject:	Re: Exhaust Temps
Glend wrote: I have noticed another factor affecting EGT which I really can't explain, different oils used in the engine can boost EGT by 50-100F especially at the lower range. For some reason some synthetic oils raise the EGT over the levels shown when running semi-synthetic oil. No idea why this is so, is it the additive package? Glen, Can you post which type of oils and weight those were that you noticed the diffenrence with?

Author:	flman [ Mon Nov 01, 2010 6:41 am ]
Post subject:	Re: Exhaust Temps
NW CRD wrote: So I installed my exhaust temperature gauge and probe last weekend. It was a rather involved process which included removing the turbo and exhaust manifold. I drilled and tapped the bottom of the manifold near the turbo to accept the probe. All in all it was simple enough, just time consuming. Anyways, the gauge is reading pretty high. Much high than I would expect. At idle it stays between 350 and 400F. Cruising at 55 to 60mph it says about 1100F. I have had it as high as 1250F on acceleration. Pretty sure there is nothing actually wrong with the motor. It's running strong, with no problems for the past 30k miles. Not even the CEL is on and, no, it's not burnt out or disabled. I was wondering who else has a pyrometer, what kind of readings are you getting, and where exactly did you mount the probe? Sounds like your pyro is reading a couple of hundred too high? I doubt you Jeep is idling at 400 EGT?

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Author:	warp2diesel [ Mon Nov 01, 2010 9:02 am ]
Post subject:	Re: Exhaust Temps
When I opened up my Exhaust by making the choke flange behind the CAT 2 1/2" and getting rid of the stock muffler going 2 1/2" all the way back, my EGT dropped. Also my boost spools up faster and the lag is gone. As far as back pressure with the CAT, if you get rid of the choke flange the back pressure goes to ZERO. Unlike naturally aspirated gassers, Turbo diesels including our CRDs do not need back pressure. In fact an Engine Development Engineer told me years ago that theoretically, you could remove the rod caps on a turbo diesel when it was running under boost and not throw the rod. Obviously no one has attempted this stunt, but it goes to show you that the need for exhaust restriction is as much of a myth as some of the Junk Science our News Media goes after. If you later go for any tune, your CRD will show its' appreciation.

Author:	MrMopar64 [ Tue Nov 02, 2010 12:15 pm ]
Post subject:	Re: Exhaust Temps
For the thermocouple installed pre turbo (turbine inlet), 400F could be considered perfectly normal. For full-load conditions, turbine inlet temps of 1500F are perfectly safe for uninterrupted continuous operation.

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