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  #1  
Old 05-27-2019, 04:46 PM
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EGTs.Who here is actually monitoring?

Having owned and driven I don't know how many diesels over the years.. I have only had two Banks equipped vehicles with a gauge. Actually they were little bit distracting. I caught myself staring at them all the time. I was just trying to get a good idea of a cruising/load temperature range. I know my suburban started out at around 700 degrees/loaded. I turned the fuel rate up to achieve approximately 1, 000.Night and day difference.So I thought I would amass a little background info on our 617s to start tuning on my son's car.I haven't come up with an ideal location for the probe.So if you have one,please include a little info on the location of the probe.
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Old 05-27-2019, 05:51 PM
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I have one but it's on a 603.
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Old 05-27-2019, 10:21 PM
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Quote:
Originally Posted by Garagefull View Post
Having owned and driven I don't know how many diesels over the years.. I have only had two Banks equipped vehicles with a gauge. Actually they were little bit distracting. I caught myself staring at them all the time. I was just trying to get a good idea of a cruising/load temperature range. I know my suburban started out at around 700 degrees/loaded. I turned the fuel rate up to achieve approximately 1, 000.Night and day difference.So I thought I would amass a little background info on our 617s to start tuning on my son's car.I haven't come up with an ideal location for the probe.So if you have one,please include a little info on the location of the probe.
I haven't hooked up the EGT gauge yet, but the first photo in the thread shows where I installed the pyrometer probe.

W115 long runner intake install in a 78 W116 300SD
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Old 05-27-2019, 10:51 PM
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I used to, especially on long cross country trips. I added a k-thermocouple to the exhaust manifold and read the temp as part of my EMS (Engine Monitoring System) - Engine Instrumentation Project
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Old 05-27-2019, 11:15 PM
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i have had one for around 2 years now. the probe is in the collector of the manifold before the turbo. even before i went to the 8mm M pump i could get hot enough to have to let out of it. as it is now i cruise at around 550* doing 60mph on flat ground. theres a local hill a few miles long i like to pull around 70mph my egt stabilizes at around 1000* pulling it. all this is with the larger turbo, intercooler, and 8mm pump of course. i have hit 1700* once during a race at around 120mph but that was at 6000 rpm where the ve of the motor goes to crap.
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Old 05-27-2019, 11:42 PM
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member graminal or maybe graminal95 was the name, put a turbo and intercooler on a 616. If you use the search feature you should be able to turn up the posts describing setup and EGT.
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Old 05-28-2019, 10:13 AM
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My probe is in the pipe right after the turbo. As short as my exhaust is there isn't much of anyplace else to put it. With the new turbo and my current 30 PSI of boost I hit about 1,000 F at the end of the track - that's 1 mile at full rack. But neither pump nor turbo is anything like stock so that probably isn't much help.


I'm going to try recording the dash gages with the GoPro at the June meet so we'll see what that shows.



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Last edited by Dan Stokes; 05-28-2019 at 03:58 PM.
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Old 05-28-2019, 11:39 AM
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My EGT probe is pre-turbo, I run ~600 ish cruising flat ground at 60 mph. Truck has the aerodynamics of a brick and tires more suited to offroad use than low rolling resistance on pavement.

Pulling a hill at WOT while hauling a load, it can get to 1100 easily and then holds there.
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Old 05-28-2019, 02:05 PM
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Are EGTs connected to coolant temp? Ie can EGTs be at unsafe levels while coolant temps are otherwise normal?
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Old 05-28-2019, 02:11 PM
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EGT stands for exhaust gas temperature. Coolant temp should have no effect on your EGT reading. Perhaps if you blow a head gasket and you're burning coolant, the EGTs may decrease...
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Old 05-28-2019, 04:02 PM
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Originally Posted by Shern View Post
Are EGTs connected to coolant temp? Ie can EGTs be at unsafe levels while coolant temps are otherwise normal?

I haven't seen any connection. I hit the end of the track at about 210-220 coolant temp and it cools right down when I release the accelerator though I'm on the return road before it gets to 200ish. The EGTs cool off pretty quickly, too.


Dan
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Old 05-28-2019, 04:18 PM
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Originally Posted by Maximan1 View Post
EGT stands for exhaust gas temperature. Coolant temp should have no effect on your EGT reading. Perhaps if you blow a head gasket and you're burning coolant, the EGTs may decrease...
Thank you -so where does the potential damage happen if EGTs get too high?
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Old 05-28-2019, 05:22 PM
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Pistons turn more liquid than solid.

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Old 05-29-2019, 12:44 AM
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Then shouldn't that affect coolant temperature?
How could a piston melt without affecting the temperature of the block?

I'm trying to imagine a scenario whereby one is able to run with dangerously high EGTS (piston liquifying) and have no indication of this on their dash temp gauge.

This is totally new stuff to me and I really appreciate the explanation!
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Old 05-29-2019, 01:46 AM
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High EGT for extended periods = coolant getting hot. EGT is the best way of knowing combustion temps. Our IDI engines have lots of surface area for combustion heat to soak into the head, so they do run hotter than DI engines.
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