EGT temp.
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EGT temp.
I've heard that before shutting down engine, EGT's should be around 300 degrees. I can't ever get them down that low, best case it's around 325-350 degrees after idling for a minute or two. Even if I idle up to 4 mins. it doesn't get that much lower. Is this normal? Thanks in advance, aloha.
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From: North Carolina
I'm going to say you're Ok if you get your EGTs down to 325*-350*. What you want to avoid is turning it off when your EGTs are at the high end, 900*-1100*. I'm not sure what impact your performance mods are having. You may want to try a complete 4" or 5" exhaust now that you have the hard part done, the 3"dp. Or at least a BTM muffler. A larger exhaust will help lower EGTs.
Enjoy those Hawaiian "winters".
Enjoy those Hawaiian "winters".
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Thanks Stroker, yeah the winter is setting in here, last couple of nights was down to 68 degrees! Anyways, I was thinking of putting on a BTM but I read somewhere that OBS trucks stock muffler was a straight through design. Does the 4" make that much difference over the 3 1/2"?
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From: Vancouver area
Gosh, I've always waited until 300° before shutting down, and feel guilty at times if I've shut it down at 310°!
For me, usually a wait of only a few seconds is needed for it to go below 300° if driving around town, although longer if towing and out on the highway.
I do have a large air intake setup and 5" exhaust, but still have my EBPV in the system which I use as an e-brake, but have no issues waiting to get to 300° which is the norm I believe.
I wonder if it has anything to do with your programming....do you have a tuner or chip in your truck?
Interestingly, if I stop and need for my EGT's to lower quicker, I flip my chip to the high idle (1100 RPM) and the temps come down in a hurry if the truck is sitting.
Dale
For me, usually a wait of only a few seconds is needed for it to go below 300° if driving around town, although longer if towing and out on the highway.
I do have a large air intake setup and 5" exhaust, but still have my EBPV in the system which I use as an e-brake, but have no issues waiting to get to 300° which is the norm I believe.
I wonder if it has anything to do with your programming....do you have a tuner or chip in your truck?
Interestingly, if I stop and need for my EGT's to lower quicker, I flip my chip to the high idle (1100 RPM) and the temps come down in a hurry if the truck is sitting.
Dale
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Hey Powerstroke thanks for the reply. No chip yet but expecting one any day now from Jody. Mines a everyday driver and everytime I pull up at home to shut it down it's around 400-425 after all flat driving. Wait about 2 mins. and it will get down to 325-350. I'm beginning to think that maybe my stock muffler is part of the problem, any thoughts? Thanks again, aloha.
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My truck is an every driver too, so you do seem to have some kind of issue, as most folks don't run that hot normally around town.
Either an exhaust issue, OR perhaps the pyrometer thermocouple in your exhaust is defective?? Where do you have yours located?
Mine is in my "up-pipe" right where the exhaust manifold dumps into the up-pipe (pre-turbo obviously).
I would say it could be a plugged catalytic convertor, but it looks as if you don't have one!
Was out driving today, and by the time I stopped...backed into my driveway and was ready to turn the key off...my EGT's where 290° F.
Most likely you will see even hotter temps with a chip, but let us know how it works for ya.
Dale
Either an exhaust issue, OR perhaps the pyrometer thermocouple in your exhaust is defective?? Where do you have yours located?
Mine is in my "up-pipe" right where the exhaust manifold dumps into the up-pipe (pre-turbo obviously).
I would say it could be a plugged catalytic convertor, but it looks as if you don't have one!
Was out driving today, and by the time I stopped...backed into my driveway and was ready to turn the key off...my EGT's where 290° F.
Most likely you will see even hotter temps with a chip, but let us know how it works for ya.
Dale
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Thermocoupler is located in exhaust manifold just before up pipe connection. My problem started with a bad gauge (intermittently turn off/on), got a new one on warranty (thanks Garrett). Although with the old gauge temps were more in line with what you have. With the new gauge I noticed the higher temps. Not sure if the higher temps are actual, or a gauge problem. Gonna get a temp gun from work and try to see if I can match gauge reading to gun reading. I will info you, thanks alot, aloha.
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From: Braham MN
Originally Posted by watermanh
the winter is setting in here, last couple of nights was down to 68 degrees!
it was 4º one nite last week.Is all about the programming, even at idle.
I used to think my '97 took forever too cool down, when I ditched the hypertech and went to a TS chip is cools off to 300º before I even am into my parking spot.
I also thought it was the probe depth in the manifold, air flow at top vs bottom vs middle yada yada yada, well the '96 has a slightly lower probe then the '97 and now low and behold the '96 takes longer to cool down. because I put the hypertech on it.
pre turbo probes in the manifolds, exhaust is listed in sig. anything below 400º and its good enough for me.
Diesel Rod
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Hey 444, 4 degrees!!!!! S#*t, my coconuts would freeze up and fall off!!!!!
OK-update. Put a lazer thermometer to exhaust manifold right where thermocoupler is located while truck is idling after getting home. Gauge reads 350, thermometer reads 290. So I'm OK with EGT's, now I'm wondering if I want to be a PITA by asking for another gauge since I just got this one from warranty, it's only 60 degrees off, any thoughts.
Since I had the thermometer I went ahead and checked temp at the turbo, right where the EBPV should be, exact same temp as manifold. Checked downpipe right at the turbo-150, huge difference and only inches apart!!! Verified thermometer readings by measuring trans temp compared to gauge reading, both at 145. Then went to my son's forehead, 98, moved on to my wife's forehead, 110 (LOL). Sorry for the lengthy post, hope this information is of some help, sure made me feel better, happy Thanksgiving and aloha to all.
OK-update. Put a lazer thermometer to exhaust manifold right where thermocoupler is located while truck is idling after getting home. Gauge reads 350, thermometer reads 290. So I'm OK with EGT's, now I'm wondering if I want to be a PITA by asking for another gauge since I just got this one from warranty, it's only 60 degrees off, any thoughts.
Since I had the thermometer I went ahead and checked temp at the turbo, right where the EBPV should be, exact same temp as manifold. Checked downpipe right at the turbo-150, huge difference and only inches apart!!! Verified thermometer readings by measuring trans temp compared to gauge reading, both at 145. Then went to my son's forehead, 98, moved on to my wife's forehead, 110 (LOL). Sorry for the lengthy post, hope this information is of some help, sure made me feel better, happy Thanksgiving and aloha to all.
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From: Braham MN
forcasted 15º tonite with a 25+ mph wind, for a wind chill factor of -10º by early morning. 
the 60º difference is nothing to worry about. your probe is IN the exhaust stream, with HOT air moving over it, the manifold only heats up what it can pick up from convection, and being cast iron, there pretty slow to heat up, but great at holding in heat, so that is prolly why you are getting a 60º difference.
the difference on the DP is same reason, the cast iron EBPV holds heat, and the DP is thin walled steel , very good at losing heat, so your EGT was only 290º and your DP disipated any extra heat it had very fast, the EBPV takes longer to cool.
Diesel Rod
the 60º difference is nothing to worry about. your probe is IN the exhaust stream, with HOT air moving over it, the manifold only heats up what it can pick up from convection, and being cast iron, there pretty slow to heat up, but great at holding in heat, so that is prolly why you are getting a 60º difference.
the difference on the DP is same reason, the cast iron EBPV holds heat, and the DP is thin walled steel , very good at losing heat, so your EGT was only 290º and your DP disipated any extra heat it had very fast, the EBPV takes longer to cool.
Diesel Rod
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This shows how well those hand held units are though, and to give him the relief knowing everything is fine, other than either his gauge, or thermocouple itself!
Perhaps the place in which you bought your gauge should be told of this test you've just done, and your concerns regarding the high EGT's your gauge is telling you of? What would be best would be for them to give you both a new gauge AND a new thermcouple.
Change one of them, and see how the other associates with your hand held thermometer, and if not in line with it, change the other!
Let us know how you make out.
Dale
Perhaps the place in which you bought your gauge should be told of this test you've just done, and your concerns regarding the high EGT's your gauge is telling you of? What would be best would be for them to give you both a new gauge AND a new thermcouple.
Change one of them, and see how the other associates with your hand held thermometer, and if not in line with it, change the other!
Let us know how you make out.
Dale
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I put back the old gauge to see what it would read, very close to thermometer (about 20 degrees higher). Put new gauge back and then I replaced the thermocoupler, yes they did send me a complete unit (again thanks to Garrett @ Blackcloud Diesel) on warranty. The coupler made no difference, new gauge reads about 60 degrees high. As 444 said, 60 degrees is not much to worry about, I can live with that, just need to keep it in mind when looking at the gauge. Thanks for all the feedback, aloha.
