What causes high EGT's?
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Elder User
Joined: Dec 2009
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From: Fort Campbell, KY
What causes high EGT's?
Simply put, what factors affect the EGT? I've finally got my truck back to a stable condition, and my EGT's are higher than they use to be.
So... I know
Air restriction
Too much fuel
???
So... I know
Air restriction
Too much fuel
???
Thread Starter
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Elder User
Joined: Dec 2009
Posts: 864
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From: Fort Campbell, KY
I upgraded:
OE 99' turbo to GTP38R
OE boots on intake plenums to Dieselsite (all 4)
OE AB sticks to AD refurb'd sticks from swamps
OE HPOP to Adrenalin pump
Same:
AIS
4" MBRP exhaust
Chip (Cale; BTS)
Boots on intercooler, OE (2 of them)
Observations, turbo spools slower than the OE unit. I have no smoke under normal driving, very little smoke getting on it unless I switch to the 140 tune.
Does that help maybe? I was getting on the highway under moderate acceleration, was approaching 80mph, and my EGT's were at 1200 empty. It was down a grade ~ 5%.
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Elder User
Joined: Dec 2009
Posts: 864
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From: Fort Campbell, KY
Joe, in another thread you mentioned that the EGBP sensor was for more than just the valve... Well as you know, mine is capped off. It wasn't back in the day. Think that in some way could be affecting the EGT's? If I knew what else this thing influences I'd know if I need to repair it; The valve has long been gone.
Post Fiend
Joined: Jun 2006
Posts: 9,714
Likes: 2
From: White Mnt's,New Hampshire
Well fudge, I was hoping for more.
I upgraded:
OE 99' turbo to GTP38R
OE boots on intake plenums to Dieselsite (all 4)
OE AB sticks to AD refurb'd sticks from swamps
OE HPOP to Adrenalin pump
Same:
AIS
4" MBRP exhaust
Chip (Cale; BTS)
Boots on intercooler, OE (2 of them)
Observations, turbo spools slower than the OE unit. I have no smoke under normal driving, very little smoke getting on it unless I switch to the 140 tune. Does that help maybe? I was getting on the highway under moderate acceleration, was approaching 80mph, and my EGT's were at 1200 empty. It was down a grade ~ 5%.
I upgraded:
OE 99' turbo to GTP38R
OE boots on intake plenums to Dieselsite (all 4)
OE AB sticks to AD refurb'd sticks from swamps
OE HPOP to Adrenalin pump
Same:
AIS
4" MBRP exhaust
Chip (Cale; BTS)
Boots on intercooler, OE (2 of them)
Observations, turbo spools slower than the OE unit. I have no smoke under normal driving, very little smoke getting on it unless I switch to the 140 tune.
Does that help maybe? I was getting on the highway under moderate acceleration, was approaching 80mph, and my EGT's were at 1200 empty. It was down a grade ~ 5%.
Postmaster
Joined: Jan 2009
Posts: 2,544
Likes: 4
From: Suffolk, VA
Really? Too much fuel and not enough air is all that effects EGTs? I thought things like SOI, atomization, compression all effect that too.
So did you change injectors but not get different tuning from BTS? I'd think you'd have to reburn for different sticks, or am I not reading it right.
So did you change injectors but not get different tuning from BTS? I'd think you'd have to reburn for different sticks, or am I not reading it right.
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Elder User
Joined: Dec 2009
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From: Fort Campbell, KY
Well I was pretty confident that they weren't leaking, BUT can't say I've inspected them. I caulked it up to a different exhaust housing (if there was?) Would there be a difference between a leak there and a leak in the old OE boots at the intercooler? How would the up pipes effect smoke?
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Thread Starter
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Elder User
Joined: Dec 2009
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From: Fort Campbell, KY
Went from OE AB's, to OE AD's. (just from Swamps)
Post Fiend
Joined: Feb 2007
Posts: 14,541
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From: Dallas-Ft. Worth
Really? Too much fuel and not enough air is all that effects EGTs? I thought things like SOI, atomization, compression all effect that too.
So did you change injectors but not get different tuning from BTS? I'd think you'd have to reburn for different sticks, or am I not reading it right.
So did you change injectors but not get different tuning from BTS? I'd think you'd have to reburn for different sticks, or am I not reading it right.
And a boost leak = not enough air whether it's in the exhaust side *or* intake side, just to be clear.
Postmaster
Joined: Jul 2006
Posts: 4,993
Likes: 2
From: Bend, OR
There are a ton of things that effect EGT's... but I cant talk about them...
Check for boost leaks, check for drive pressure leaks... Thats your issue right there is lack of air flow.
Did you mess with the wastegate on the 38r when you installed? I have seen some come out so loose they were opening at 8psi...
Check for boost leaks, check for drive pressure leaks... Thats your issue right there is lack of air flow.
Did you mess with the wastegate on the 38r when you installed? I have seen some come out so loose they were opening at 8psi...
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Elder User
Joined: Dec 2009
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From: Fort Campbell, KY
Not really, no sudden onset, just remember when I first got my BTS tranny I could spin both tires from dead stop and no brake. That was with an XLE4 pcm, TS 6-pos chip, E99 turbo and AB injectors.
Yes, E99 IDM, modded to 140 and the Adrenalin HPOP.
So should I be seeing smoke, or just elevated EGT's
Yes, E99 IDM, modded to 140 and the Adrenalin HPOP.
So should I be seeing smoke, or just elevated EGT's
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Elder User
Joined: Dec 2009
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From: Fort Campbell, KY
Lookin more and more that way. I just thought it would roll smoke if there wasn't enough air. The WG was exactly that loose, when I first installed the turbo. It is not connected (capped off) and once I get the coals moving, I'll see ~33-36psi now that I've adjusted it.