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Old 08-23-2011, 11:09 PM   #1 (permalink)
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how to lower EGTs?

so I was just driving around the city tonight and noticed that my EGTs seemed a little high, just wanted your guys opinion rather than learn the hard way that its running too hot and ruin my turbo or something costing me thousands.

seems like even touching the throttle sends it to 1000F, and it hits 1500F quite easily when I really touch the throttle.

how long can I run at 1000F before it hurts something? I know aluminum melts at like 900f?

driving down the highway cruising is around 800F
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Old 08-23-2011, 11:11 PM   #2 (permalink)
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I have smarty s-06 on sw7 right now with most of the settings (tq mgmt, RP, timing) aimed towards MPG and longevity.
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Old 08-25-2011, 03:21 AM   #3 (permalink)
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1000 isn't bad u could sustain 1000 and it wouldn't hurt ur motor, what's aluminum? Cummins have iron heads unlike the dmax, 1500 on a hard pull isn't bad but once it hits that much its time to let off. I cruise 70 with my egts at 650 with the smarty on tnt 8
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Old 08-25-2011, 10:30 AM   #4 (permalink)
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ok they have iron heads but is there anything else in there that is aluminum?

I was talking with professional truck driver (not a pro mechanic) and he said that their big diesel semis run at 800F, same as ours, and he damn near had a heart attack when I told him mine will hit 1500F for short periods when climbing and really accelerating. he argued with me for half hour trying to tell me that that would ruin my motor by melting aluminum, etc... I didnt believe him, I knew he was wrong anyways.

maybe im just being paranoid, or maybe im watching the pyro too much. it just seems like its always running 1000+ and when I touch the throttle, even on flat ground not even a hill, it will get up to damn near 1500F. how long can I go at 1500F for before it damages something? 10 seconds? 10 minutes? 10 hours?!
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Old 08-25-2011, 10:31 AM   #5 (permalink)
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I just read a thread where a guy blew up his new engine from doing 1500F burnouts and stuff so kinda got me worried.

what can all be done to lower EGTs?

and why do mine seem high? or are they pretty normal?

thanks!
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Old 08-25-2011, 11:14 AM   #6 (permalink)
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With Heavy trucks, all I've seen is the probe post turbo, so it will be warmer than that.
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Old 08-25-2011, 11:55 AM   #7 (permalink)
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post turbo? so thats before the turbo? what do you mean it will be warmer than that.

makes me wonder...these stock trucks dont come with EGT guages, (right?) and they get driven for years and years and years, and im sure they get driven hard too at times... those people dont have an EGT gauge to worry about so is it really that critical or am I overthinking it and being paranoid?
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Old 08-25-2011, 11:59 AM   #8 (permalink)
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1500 it tooo warm for my comfort. I would say just by judging your sig. your problem is your gearing. When you threw on that lift and 38's did you re-gear?
If not your working it hard to get going which is why your getting that hot so easily IMO....
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Old 08-25-2011, 12:00 PM   #9 (permalink)
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Originally Posted by dieselnoob89 View Post
post turbo? so thats before the turbo? what do you mean it will be warmer than that.
Post turbo is after the turbo, before would be "pre". But what he is trying to say is if your probe is "post"/after the turbo its really telling you a cooler temp than the exhaust entering the turbo. The temp could vary atleast 100 if not more...
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Old 08-25-2011, 12:04 PM   #10 (permalink)
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^ that makes sense. I bought it like this so I am not too sure if its geared or not. I also drive/accelerate VERY fast sometimes, I dont baby it on its way to 70MPH sometimes so maybe thats why too lol. I dont hit 1500 easily, I really gotta step on it and wait for the turbo to spool and keep stepping on it. its only when I am accelerating fast and bagging on the truck I see those temps. thats driving like an though, most of the time I drive normally and see a little over 1000 when I am accelerating lightly I believe.

it just scares me. I am new to diesels and thats the last thing I need to do is prove my dad right by blowing something up costing thousands!!
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Old 08-25-2011, 12:09 PM   #11 (permalink)
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I hear ya, well ease up on the throttle and you should be alright, but I would investigate alittle on the gears, If it is still the factory 3.73 or 4.10 you'll wanna step them up to atleast a 4.56. You'll gain pick-up, fuel mileage, and cool your EGT's
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Old 08-25-2011, 12:10 PM   #12 (permalink)
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Post turbo is after the turbo, before would be "pre". But what he is trying to say is if your probe is "post"/after the turbo its really telling you a cooler temp than the exhaust entering the turbo. The temp could vary atleast 100 if not more...
ah ok, my bad. brain fart on the post/pre thing lol.

so my actual EGT temp is even higher than what the EGT meter says because the turbo cools it down a little bit? like 10%

so the EGTs actually entering the turbo are more like 1600+

while im the noob question mode.. what exactly is the exhaust gasses that feed the turbo? to me it makes me think of the exhaust coming out of the muffler, but I dont see that powering the turbo along with black smoke.

thanks for the help, I really appreciate it. I am slowly wrapping my head around diesels.. I love it, can NOT wait to start modding it up and doing my own work
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