Post turbo EGT's

Reply Subscribe

Thread Tools

Search this Thread

Sep 9, 2009 | 10:37 AM

78sharpshooter

Thread Starter

Senior User

Joined: Jun 2007

Posts: 188

Likes: 0

Post turbo EGT's

What are the typical Post turbo EGT's for an unladen truck? I seem to stay less than 900 running around town but haven't pulled my boat yet and there are a few decent hills that I have to go up when moving the boat around. The truck weighs 7420 and the boat/trailer with all 115 gallons of gas comes in around 6000. Basically, I would like to know at what temp I should back off.

1993 F350 Crewcab 4x4, SRW, ZF 5spd, ATS turbo.

Sep 9, 2009 | 11:45 AM

Gr8ride

Senior User

Joined: May 2001

Posts: 276

Likes: 0

From: Texas USA

If I am cruising down the highway @ 65 mph the egts are usually 450-500 degrees thats with the truck empty. If I am pulling a trailer that weighs about 10K, then it will be up around 800 degrees. Yesterday I got it up to a little over 900 degrees and freaked out, I don't like keeping it hot like that for a long period of time.
If you are just driving around empty and its going up to 900 degrees then either the egt gauge is bad or you have the fuel turned up to much. Depending on ambient temperature and your speed, an empty truck should be anywhere from 450-600 degrees.

Sep 9, 2009 | 12:06 PM

78sharpshooter

Thread Starter

Senior User

Joined: Jun 2007

Posts: 188

Likes: 0

I just spoke with the company that installed the turbo on this truck and mentioned that I hit 900 when punching it up a hill and he seemed to think that was fine.

I pulled the gauge and probe and put it into boiling water and it was about 20 degrees over what it should have read.

Sep 9, 2009 | 03:20 PM

Gr8ride

Senior User

Joined: May 2001

Posts: 276

Likes: 0

From: Texas USA

Climbing a hill and hitting 900 degrees is fine, I thought you meant that driving on the flat just cruising you were hitting 900, which would be a problem.

Sep 9, 2009 | 10:04 PM

Dave Sponaugle

Post Fiend

Joined: Nov 2003

Posts: 21,285

Likes: 15

From: Nutter Fort, WV

With the thermocouple after the turbo, 900 is about as hot as you want to see.

Turbo soaks up about 300 degrees, so 900 plus 300 would be 1200 pre turbo EGT.

Sep 10, 2009 | 09:38 AM

axe_handle

Senior User

Joined: Sep 2007

Posts: 317

Likes: 0

From: Snohomish, WA

I had my thermocouple mounted right after the turbo before I moved it to the driver side exhaust manifold.

The temperatures you are seeing are about what I experienced when it was post turbo. What I noticed when i moved the thermocouple from after the turbo to the exhaust manifold, was how much faster and wider the EGT fluctuates. Given that the whole point of measuring EGT in a diesel is to ensure you don't over heat the pistons, putting the thermocouple post turbo does not seem do much for you.

I would not turn the fuel up beyond stock with the thermocouple mounted post turbo. You will simply not see the spikes in EGT that you need to with it mounted there.

I was surprised by how easy it was to drill and tap the manifold for the 1/8" NPT mount for thermocouple. Only took me 30 min or so.

Sep 10, 2009 | 10:08 AM

78sharpshooter

Thread Starter

Senior User

Joined: Jun 2007

Posts: 188

Likes: 0

Did you have to blow out the chips inside the manifold after drilling? I was thinking of adding a few more gauges; pre-turbo EGT, coolant temp at the heater core hose, digital oil pressure etc.