Newbie high EGT concerns
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New User
Joined: Sep 2005
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From: SW WA
Newbie high EGT concerns
My peak Pre-Turbo EGT's are 1228 & 1250. These seem kinda high to me, do I have a problem here?
Just got the MBR cool duals w/resonator tips, air raid intake, & bullydog pup w/outlook installed last week. Situation was going up a short but fairly steep winding hill about 35mph in high 2nd or 3rd with my foot a little in it but not on the floor. Had it in "D" but it was just before shifting. Was @ about 2500-2800 rpm. Outside it's 40-45 degrees and rainy. Truck is a brand new 06 F350 CC LWB 4x4 PSD with about 250 miles on it. Also has Toyo 35x12.5R18 MTs. EGT's seemed to be running around 1150 or so on avg. up that hill and it is only that high for 15 seconds or so. Post-Turbo seems to max out around 300-400. Since the truck is still in "Break-in" I've never had my foot on the floor nor had the bullydog out of "stock". The bully dog manual (BDM)says default defueling is at 1250 so that may be why I didn't go over that. BDM says that I should set defueling to 150 over whatever it peaks at in stock setting. That would be 1400! not considering even considering I'm was running empty on a short grocery run.What do yall think?
Just got the MBR cool duals w/resonator tips, air raid intake, & bullydog pup w/outlook installed last week. Situation was going up a short but fairly steep winding hill about 35mph in high 2nd or 3rd with my foot a little in it but not on the floor. Had it in "D" but it was just before shifting. Was @ about 2500-2800 rpm. Outside it's 40-45 degrees and rainy. Truck is a brand new 06 F350 CC LWB 4x4 PSD with about 250 miles on it. Also has Toyo 35x12.5R18 MTs. EGT's seemed to be running around 1150 or so on avg. up that hill and it is only that high for 15 seconds or so. Post-Turbo seems to max out around 300-400. Since the truck is still in "Break-in" I've never had my foot on the floor nor had the bullydog out of "stock". The bully dog manual (BDM)says default defueling is at 1250 so that may be why I didn't go over that. BDM says that I should set defueling to 150 over whatever it peaks at in stock setting. That would be 1400! not considering even considering I'm was running empty on a short grocery run.What do yall think?
Last edited by Rancher Rob; Nov 14, 2005 at 02:41 AM.
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From: Hendersonville, NC
The engine doesn't even know the difference between stock and 1250- stock very well may push 1200. 1400 is totally harmless too. Mine has shrugged of well over 1700 on this current engine with no damage (the heads have been off, and the pistons are spotless). You don't even want to know what kind of temps it actually takes to do real damage (there are pics in my gallery).
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I don't know about diesels but a gas engine melts at 1400 and 2 stroaks at 1350. I was told never to run past 1350/1400. I thik I have heard of semi trucks running up to 1700 as well though so I'm abit confused about diesels. Also on a gas engine you can show high egt if the engine is excessively rich. You get afterburn into the exhaust, not sure if diesel can do this as well? Is your exhaust blowing smoke when you hit your high egts.
Last edited by IB Tim; Nov 15, 2005 at 07:07 AM.
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Joined: Jul 2005
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From: 21791
yeah, a lean condition will always mean higher temperature than a correct mix. my first thought on what he said, was that maybe gassers are allowed to get away with higer EGT's if they have a slightly-rich mixture, because of the extra cooling.
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From: Hendersonville, NC
Frankly I don't know much about gas engine stoichometric tuning, but more fuel in a diesel = hotter EGT- but I can tell you from experience 1400 "ain't gunna hurt nuthin 
"
"Last edited by PSD 60L Fx4; Nov 14, 2005 at 05:32 PM.
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From: Melbourne, Aus
Originally Posted by chrono4
pretty sure you got it backwards, its hot if its lean i thinkg.
Very excessive fueling can cause high EGT's, as the unburnt fuel conmbusts in the exhaust manifold - however this won't damage the combustion chamber.
Running lean will cause excessive temps inside the cylinder, which causes high EGT's, and melts pistons (don't ask
)Diesels on the other hand are a completly different kettle of fish, high EGTs just mean lots of fuel, a diesel naturally burns lean.
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Originally Posted by BigF350
On a gas engine, both can do it...
Very excessive fueling can cause high EGT's, as the unburnt fuel conmbusts in the exhaust manifold - however this won't damage the combustion chamber.
Running lean will cause excessive temps inside the cylinder, which causes high EGT's, and melts pistons (don't ask )
Very excessive fueling can cause high EGT's, as the unburnt fuel conmbusts in the exhaust manifold - however this won't damage the combustion chamber.
Running lean will cause excessive temps inside the cylinder, which causes high EGT's, and melts pistons (don't ask
)egt are the most unanswered question I have ever heard. I run some turbo gas stuff (bike and sandrail) and nailing down a proper melting temp is impossible. General upper safe temps are what I said before with the egt probe 4" from the head.(which is proper) as far as a diesel I am confused because I have heard before that some diesels run at 1700 on semi trucks. Seems a piston is a piston, forged aluminum melts the same where ever. It might be the different diesels either 2 stroke diesel or 4. But in general it seems diesels can run a bit higher.
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From: 3rd Rock
Very excessive fueling can cause high EGT's, as the un-burnt fuel combusts in the exhaust manifold - however this won't damage the combustion chamber.
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New User
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From: SW WA
Well now I'm up to 1377 peak on stock setting. Don't know when or where it happened but the "max pyro" reading is now up there. Still makes me nervous but I'll chalk it up to it being the new environmently friendly, thorough burning engines. If it gets too bad I'll add water injection. Thanks for all the input and calming my fears of burning up my engine.
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From: Reno, NV
Rancher, you said that you have 35" tires. I am assuming you still have the stock gears in. This will put more of a load on the truck causing the EGT's to rise. Do you have the outlook set to defuel on high EGT's? I am just shooting from the hip here.
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From: Paola, KS
Originally Posted by PSD 60L Fx4
The engine doesn't even know the difference between stock and 1250- stock very well may push 1200. 1400 is totally harmless too. Mine has shrugged of well over 1700 on this current engine with no damage (the heads have been off, and the pistons are spotless). You don't even want to know what kind of temps it actually takes to do real damage (there are pics in my gallery).
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From: SW WA
Yup, same stock gears. I thought of the tires too but since the stock ones were 32"-33" I figured the weight difference in the 35"s wouldn't be too much.
The bullydog is set to defuel at 1400 degrees. I'm up to almost 600 miles now so in another couple weeks when I hit 1000 I'll get a bed full of gravel and run up mt. hood and see how it does.
The bullydog is set to defuel at 1400 degrees. I'm up to almost 600 miles now so in another couple weeks when I hit 1000 I'll get a bed full of gravel and run up mt. hood and see how it does.
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From: Gilbertsville, PA
I have an 04 F350 6.0 and I also have the bully dog pup w/ outlook, bullydog air intake, 35" BF Goodrich Mud Terrians and 4" Mbrp exhuast with 6" tips. My Egt readings are 1500 to 1600 with 26,000 miles on the engine and still putting out power!
