High Stock EGT's!!!

[curatchko]

Playing around on the way home from work last night I decided to see how high I could get the EGT's no load... . No mods to the engine yet.



On a foot to the floor run in OD, from 70 to 100 mph I can get 1200 degrees. NO LOAD, 20 degrees outside!!!!!!!!



What's going to happen when I have a 12k lb trailer behind it, 95 degrees out in the summer accelerating from 0-70????



As for Engine Mods... . not until I can get some breathing taken care of that's forsure... .



Don't recall this being an issue on my 99.



Chris

 

[Floor It]

The issue with the new trucks on EGT's seem to be more related to high rpm, I have a customer with the EZ on level 4 pulling through the mountains and had no problem controlling egts. Yes he could get it to 1300 deg by down-shifting and reving the motor up,but had no problem pulling up the roads at faster than the speed limits.



John

 

[Mopar_Mudder]

Originally posted by Floor It

The issue with the new trucks on EGT's seem to be more related to high rpm, I have a customer with the EZ on level 4 pulling through the mountains and had no problem controlling egts. Yes he could get it to 1300 deg by down-shifting and reving the motor up,but had no problem pulling up the roads at faster than the speed limits.



John

I have the same results, the high rpm's is what causes the high EGT's



I pull at 30,000 GCVW with EZ on 4. Can go full trottle through the gears shifting at 3000, finally in 5th at about 2600 the EGTs get over 1200, but shift to 6th and they drop right back down.

 

[LightmanE300]

Has anyone measured the egt reduction of a Scotty 3 intake or AFE on an otherwise stock engine? I wonder if they help the above posted problem with empty high rpm egts!?

 

[Firewalker]

Crirs Well lets get the trailer out this saturday afternoon and test run both of our trucks!!! Lets see what they do... .

ken

 

[Greg Boardman-RIP]

1200* is normal for a stock truck. Must not be as bad as we would think or they would be limited from DC. If you drill a 4" hole in your stock airbox ( bottem) it will help a little. As for towing, with the stock truck just let up on the throttle a little bit and EGT's go to 900* fast. I can completely control EGT's while towing 12,000 lbs. A larger exhaust will help about 100* and I have heard the Scotty III will help too. Call Rod @ www.wildcatdiesel.com and ask him. He is the man selling the S III. In the new TDR mag there is a writeup on the S III too.

 

[Rosco]

Glad I have a aFe Megacannon coming. That should reduce my EGT's some.

 

[KLockliear]

EGT is influenced by airflow and pilot injection on the new motors. The head is kinda bad, which means as the RPM goes up, it just can't get the heat out as quick. Not to mention the itty bitty turbo on those things, also doing what it can to keep the temps up.



The pilot injection turns off at around 2700rpm, so that's another reason you see the EGT's shoot up at higher RPM's.

 

[Vaughn MacKenzie]

I heard the airflow was higher than the previous 24-valve and significantly higher than the 12-valves. Of course part of the increased EGTs are from higher horsepower ratings from the 3G trucks.



Vaughn

 

[Forrest Nearing]

a bigger turbine housing would help keep the EGT's from climbing at high RPM like that.



Forrest

 

[sangell]

I am the customer Floor It is refering too. Last labor day I hauled the Jeep to Moab UT from Kansas City. Pulling up to Vail pass (10. 5k feet or so) I had to down shift from 6th to 5th about a 1/3rd of the way up. In 5th I used the throttle to hold the EGTs between 1250 and 1300. I tryed to keep them at 1250 but sometimes I got a little excited and they hit 1300. At the top I was at 1250* in 5th gear doing 65mph. GCW was 16k +/- a little.



Scott

 

[Vaughn MacKenzie]

Scott, what RPM were you turning in 5th?

 

[BigDaddyMC]

Here is the scoop with the egt's on a a stock truck and a modded truck.



I decided to do a little test with my O4 baby before I went crazy with the mods so the very first thing that went on were a set of AutoMeter Ultralite guages. My probe is pre-turbo in the manifold right between 3 and 4. The temps recorded are as follows.



Conditions:

121*F - Death Valley

Clear

5mph wind (head wind)

6% incline (1. 87 miles long)

Truck Fully loaded with a Full toy box (9546lbs at the scales)





Bone Stock Truck in OD

63mph top speed up the hill

egt's = 1290*F

1750rpm

17. 5psi of Boost



Bone Stock Truck in 3rd

58mph

egt's = 1310*F

2700rpm (around there... I was a little pre-occupied with the egt guage!)

17. 5psi of Boost



Truck w/Mods OD(4"DP, Cool Air Intake/Pro Guard 7, Edge EZ, Boost Elbow)

65mph up the hill as a baseline comparative

egt's = 1100

2200rpm

30psi of Boost



Truck w/Mods OD(4"DP, Cool Air Intake/Pro Guard 7, Edge EZ, Boost Elbow)

75mph top speed up the hill

egt's = 1250

2200rpm

35psi of Boost



Truck w/Mods 3rd(4"DP, Cool Air Intake/Pro Guard 7, Edge EZ, Boost Elbow)

68mph

egt's = 1370*F

3000rpms

35psi of Boost



The only difference between the two days was the temps... . there was about a 5*F difference in the two days.



I dropped about 200* with the mods, but I don't think the egt's dropped due to the intake or exhaust, I think they dropped due to the amount of boost. With out the boost elbow (has a pin hole in it to trick the wastegate) the temps were rediculous.



The injection does change the egt's in an adverse way STARTING at 2700rpm. At that rpm, the injection system starts it's Multi-firing and adds fuel on top of what is actually needed. The injection system is thinking that it needs to deliver more fuel due to the rpms that are being produced. Call Diesel Dynamics, Edge whomever you choose and they will tell you the same thing.

I do believe that the exhaust and intake help to not hinder the mods and HP gains. Without the exhaust and intake, a choking effect would occur.



IN the old days, if we wanted to drop egt's, we would down shift and make more boost via more RPM's. I don't care what diesel truck you owned. Not the case in the world of common-rail systems... great for the CUMMINS owners due to the fact that we develope power much earlier. We are simply more productive before other trucks. Wait until you are pulling hard next to your buddy with about the same weight.....



I'm am completely embarrasing Duramax's with 125hp boxes, and leaving Ford's with their new 6. 0 PowerStrokes. I'm am a convert to Cummins but am now a true believer. I tow with a bunch of guys back and forth to the sand dunes about every other month. They hate me



Cheers!

 

[zari]

Stock filter and exhaust. EZ on level 6 when not towing; on level 4 when towing ~12,000# 5er.



I initially started out without the elbow (didn't want any 'lasting' mods). Temps got into the 1200-1300 range real fast, both with the EZ on 4 and 6.



Installed the elbow after talking to Edge about the high EGTs. I seem to run 100-150*F lower with it.



Anybody tried pulling with EZ on 6? I'm <em>thinking</em> about trying it in the spring, instead of switching between 4 and 6...

 

[LightmanE300]

Good info B D MC!



Zari, sounds to me like if I were you, I'd just run it at 4 all the time. Is pushing the limits really getting you THAT much more power between 4 and 6?

 

[zari]

LM300 - yes, keeping it on lvl 4 is the other option. Don't think it makes that <em>huge</em> of a difference, but it sure kicks butt empty on 6 - just ask my Powerstroke neighbor

 

[JHardwick]

My EZ has been on #6 since I installed it and instead of installing the elbow I just pinched the line to the wastegate, letting me hit 40#.



I've towed 3 horses and a weeks worth of camping supplies from Ohio to Tenn twice. Hauled anywhere from 2 horses to 4 more locally too many times to count. Hauled hay, excavators, bushhogs ... ... ... ... ..... my only complaint is the black soot on the dually fender

 

[jcarew]

Hi I had a stock 02 cab-chassis ho6spd 4:10 made into a Class C m. h. it is 11ft 6in tall an pushs a wall of air going down the road. I had big time egt problems on any kind of hills never mind the mtns. I did the Genos srraight pipe thing, The BHAF air setup with the Boesel aluminum deflector in place. Not enough improvement to even talk about. Then I bit the bullet an had a stock Hx40 turbo installed. Banzai!! like magic. Truck now performs like it should, what is the point of having all that H. P. if you can,t use it without fear of doing major engine damage. no more egt problem I can now run 65 up or down anywhere. an woof up most other r. vs. anyway it works for me!!! been to Alaska with it, all the way to Deadhorse at Prudoe Bay. love it.

 

[XcumminsX]

well my truck is stock except for exhaust and i know ive had it with od off running 2900 rpm for around 30 seconds... had no clue the stock egts run that high... .



I do alot of short trips so i figured by running it like that would clean out everything and wouldnt hurt...



Wow after seeing this ill never do that again. .



Im suprised the truck didnt blow up.



Nick

 

[LightmanE300]

Nick these trucks run VERY clean, I wouldn't do that again just for the sake of having high rpms, hehee