Lowering EGT's????

Bosshawg600

Bosshawg600

PDP.com FireFighter
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So I made the treck to TS and back but the entire time I was fighting EGT's (and oil leaks). But I went down on a bone stock Hx35w. I was running somewhere around 900 the entire time (til I pulled the hills near BG) and i would max out at 1200, could have hit higher but I feathered the throttle a bit.

So while I was down there I went ahead and swaped in the new charger. S400sx with a 1.0 A/R T4 housing. Thought this would dramatically lower my EGT's due to the bigger housing and allowing my ported head and big cam to do their job. Well it had the oposite effect. On the way home I ran easly 1000 the entire time. When I was lucky I could get it in the 8-900 range.

Now why would my EGT's get so high? I got the fuel turned all the way back, and even when i get on it hard, it barely smokes. Im thinking that maybe my Lazer Cut DV's dont like me too much, or something weird is going on.

What else can I try to get my EGT's in the managable range? Even with a stock pump on the old motor I would run 900 everywhere! There has to be something Im missing and thats why I run so hot!

Swap out DV's?

I know I need a .9 A/R housing to get the turbo into the RPM range that i want, but a 1.0 aint that much bigger.
 
Thats what I was thinking. I truely hate Full or Lazer Cuts (mine are cut down 131's!) I have no use for that much low end fuel with the big single. Im thinking I should be fine with a set of 181's for less low end and my injectors would make up for it in the top end.


Thing I dont quite get is.....My fuel plate is all the way back as well as the AFC, so basically my fuel is all the way down. Does the DV's still have this big of an effect at this low of fuel????
 
No surprise that the big single didnt lower your cruising EGTs. With full cuts and DDP4s with a PhatShaft71 my cruising EGTs would hover around 1000. Bigger singles are sort of "lazy" and they dont move much air at lower RPMs. Swap in some 181s and see how much of a difference it makes. Are you absolutely certain of your timing? Retarded timing can make for some toasty EGTs. Does it still white smoke a lot? What size injectors are you running?
 
Your not spinning the wheel hard enough to move the air.
 
teddybear said:
No surprise that the big single didnt lower your cruising EGTs. With full cuts and DDP4s with a PhatShaft71 my cruising EGTs would hover around 1000. Bigger singles are sort of "lazy" and they dont move much air at lower RPMs. Swap in some 181s and see how much of a difference it makes. Are you absolutely certain of your timing? Retarded timing can make for some toasty EGTs. Does it still white smoke a lot? What size injectors are you running?
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Timing is at 22.5*, and I can understand the turbo being "Lazy", heck its just like me....big and doesnt move to well til someone light a fire under my butt!

I was cruzing down the highway at 5psi or so, 10psi when I would hit a grade.

My white smoke is way down, and once it warms up its almost gone. But right now Im running a set of Scheid Competition injectors (8x16's). Yes I know they are pretty big, but they are VERY controlable while driving.

I think now Im on the hunt for some 181's and see what that does!



My biggest suprize is that these are basically the same EGT's I was running before my engine build. Same DV's, Same injectors, less fuel, just a bigger turbo. Now I got lowered compression, big cam and a ported head.....I thought this was going to make it run cooler??? Now its running the same if not hotter.
 
GOT-Torque said:
I wish my EGT's were that low...

Where does the charger lite at?
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Charger starts to move the guage around 1900-2000, by 2500-2700 it realy starts taking off. And this is with me being pretty easy on it. I got to do retorques to the head before I realy lean on it good!
 
Bosshawg600 said:
Timing is at 22.5*, and I can understand the turbo being "Lazy", heck its just like me....big and doesnt move to well til someone light a fire under my butt!

I was cruzing down the highway at 5psi or so, 10psi when I would hit a grade.

My white smoke is way down, and once it warms up its almost gone. But right now Im running a set of Scheid Competition injectors (8x16's). Yes I know they are pretty big, but they are VERY controlable while driving.

I think now Im on the hunt for some 181's and see what that does!



My biggest suprize is that these are basically the same EGT's I was running before my engine build. Same DV's, Same injectors, less fuel, just a bigger turbo. Now I got lowered compression, big cam and a ported head.....I thought this was going to make it run cooler??? Now its running the same if not hotter.
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I thought Scheid used 6 hole injectors for competition.
 
With your fuel turned down to prevent smoking out the sun you will not make much boost when cruising and dd'ing man. If you turn up your fuel (and yes you will smoke like a train at low end) but you will get more boost while driving and it will lower your EGTs. My EGTs lowered on my SPS 66 when I went from 150's to 240s cause the turbo did not have to work as hard to move the air.
 
The fuel makes since. I just ran into town to was the truck after the TS mud pit, and decided to just give it a little....not much though, still babying it. But i could build 15lbs with ease going down the streets and barely give a good haze.

Ill put it at about 1/2 fuel and see what that does for everything. But I think Im still going to swap some 191's in there just for less bottom end fuel!

But before I realy start to romp on it, its time for a re-tq! Got some decent blow by and a bit of water seeping out of the back of the head, nothing big and nothing a re-tq wont fix!
 
8x.016's, lazer cut dv's, big laggy single, and high egt's? Sounds like your exhaust thermostat is stuck closed.
 
I need to get me a new one of them :bang

I know I know, I should be suprized, but its auctually worse with the ported head than with out. Thats what has realy took me by suprize!
 
A big single, unless its VGT, or has a tiny exhaust housing, will never run cool at cruising speed, or while pulling a load.

Honestly, i think many times people are mislead into thinking the bigger the turbo they have, the lower the EGT. This is true to a point when you are talking wide open drag strip/pulling track performance, but for daily driving, and pulling a trailer, a big single is not a good setup at all. Which is why i refuse to put anything too big on my truck. I have been in trucks with 62mm chargers and was not impressed with how they pulled a load. EGT's were hard to control on the hills even with just a 62mm charger.

I was pulling a goosneck with my 58mm HX40 today and running about 800-900* cruising. I think 1150* or so was the most i saw in valet mode when i was leaning on it pretty hard, which isnt really high at all. Granted, it wasnt much of a load, but i am anxious to see how it does when i get the chance to pull with it some this summer.

Anyways, what im getting at, is that you will have high cruising EGT's. Its just part of it with a larger turbo.

Eric
 
Bosshawg600 said:
Got some decent blow by and a bit of water seeping out of the back of the head

nothing big and nothing a re-tq wont fix!
Click to expand...

you prolly already figured this out but retq the head wont do anything about a blow by problem

blow by is gas making its way by the rings - not the head gkst
 
Cummins Driver said:
I have been in trucks with 62mm chargers and was not impressed with how they pulled a load. EGT's were hard to control on the hills even with just a 62mm charger.

Eric
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whos chargers eric?

what housings?

i think a lot of these guys think they have a 600 cu in detroit and can lug em down to 1600 rpm
 
Cummins Driver said:
I have been in trucks with 62mm chargers and was not impressed with how they pulled a load. EGT's were hard to control on the hills even with just a 62mm charger.
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No AFC, 0 plate, Full cut DVs, and 370s might have had a little to do with that :hehe:

DTanklage said:
whos chargers eric?

what housings?
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One of the trucks Eric is referring to is mine. The charger was a 62/71/14 from Industrial Injection.
 
zstroken said:
Your not spinning the wheel hard enough to move the air.
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X2. Even with the 62/71/14 I had it was a little lazy feeling. Its kind of like it was either on or off. I think this characteristic can be mostly attributed to the larger turbine wheels.
 
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