Engine/Transmission (1994 - 1998) What's normal for EGT's?

[danadj2]

I just installed a pyrometer (post turbo) at the elbow just past the Turbo. What temps should I be reading with normal road speeds and no load? What I am seeing is around 550 to 600 degrees.

 

[JGheen]

The best most accurate place is pre-turbo in the exhaust manifold, but since yours is post turbo you will be doing a lot of adding and subtracting. I have heard a good rule of thumb for post turbo temps is add about 300*F-500*F to what your gauge is seeing. So if your seeing about 550-600, your actual EGT is probably around 850-1100*F.



Joe

 

[bmoeller]

danadj-



Those numbers look high for post turbo, just cruising, no load. Sound right if the thermocouple was in the manifold, or if they are your max EGTs at WOT. I had those numbers PRE-turbo on my truck, with having the #10 plate as the only fuel mod at the time. I saw a max of 950* with #10 @ WOT.



Turbocharger FAQ

 

[NIsaacs]

I have three CTD powered pickups, all post turbo, all right at 600* cruising speed. Seems ok to me.





"NICK"

 

[danadj2]

My wrench-turner friend who has a Ford is saying the temps I'm seeing are normal for preturbo. The sensor is just outside the impellar of the turbo and we've come to the conclusion it is close enough to the turbo to give reasonably accurate readings. Just wanted to get everybody's thoughts on this.

 

[DieselMinded]

http://www.3d.otisnet.net/what_to_monitor_for.htm



DM

 

[RJPotts]

There is a lot of heat lost even in the short distance from the manifold to the elbow post turbo, enough to make it inaccurate. The turbo is more restrictive than you would think and gives exhaust a good chance to cool considerably. Most accurate place is the rear volute of the manifold about 1. 5" from the turbo flange.

-R. J.

 

[danadj2]

That makes sense, I am curious why I am showing the 550-600 temps (normal no-load driving) in the location I'm at which is about 1 1/2 inches aft of the turbo. My truck isn't running rich and get's approx. 20 mpg all the time I'm running empty.

 

[Champane Flight]

Both

I have been through this same thing before. Had an old diesel mech tell me years ago that a rule of thumb was aprox 100' degrees drop per inch from turbo. After being told that pre was the only way to go, I installed a pre turbo probe also. Had post installed earlier. Difference of two hundred degrees when stablized. Probe in post side is in elbow (stock location at nipple) two inches from rear of housing. Pre is much more sensitive, quicker, but also very unstable, I use it to gauge power runs, pulling long grades, I use the post for cool downs. Very easy to put a switch inline to gauge and switch back and forth. The old mech was right on, at least in this app.



I run 500-600 at speed post, pre varies all depending on boost/power applied.

 

[danadj2]

I'm trying to figure out how to paste a picture of where my probe is. Any ideas? By the way Champane Flight, I must be 100 or less degrees off because I'm right at the back door of the Turbo.

 

[danadj2]

I think I've got the picture thing figured out thanks to my wife. This is where I placed the probe.

 

[Champane Flight]

Still

Your about 1 1/2 from impellers. It is just a rule of thumb though, too many variables for accurate readings. Like when under acceleration my pre rises way faster than my post. It is only when under a hard long pull that I can get a fairly accurate split of around 200 to 250 of pre and post.