Now see that ... now I'm cunfused again ...

I was under the impression that the EGT reading BEFORE the would drop QUICKER rather than AFTER the turbo. That's why it was recomended to install the probe on a timer AFTER the turbo.

Grrrrrrrrrrrrrrrrrrrrrr ....................

 

Don't be confused.......

Performance purposes: pre-turbo (this tells what the valves and turbo vanes are feeling)

Cool down purposes: post-turbo (this tells you the heat soak that is actually occuring in the turbo housing)

Eeesss ahl vewy simpoo, young grasshoppa!

 

Yeah, I remember you telling me this before "En-say", however according to Drew ( if I'm understanding him right ) he says that after the turbo would be LOWER that before it. I thought it was the other way around.

 

and your right. . .temp readings after the turbo are lower than those before the turbo.

 

Ooooohhhh, reeessen crosery young wun!

The probe itself will read lower after the turbo, while the truck is running. This is because the turbo soaks up almost 30% of the heat that is actually produced by the engine. This heat is "soaked" into the turbo's housing. That is why the post turbo probe, during operation, reads lower.

Now, when the truck comes to an idle, the exhaust gases cool very quickly and the pre-turbo probe shows a lower temp. This is because the post-turbo probe is see the residual heat that is now being "soaked back out" of the turbo housing and exiting the exhaust stream.

The actual exhaust gases cools very quickly, the turbo housing takes much longer to cool. If you were to immediately turn the truck off, the only way that heat escapes is to radiate out into a hot engine bay. Then the oil doesn't flow and just sits on the turbo shaft and cooks.

What also happens, is you see the pre-turbo temp begin to rise after shut down, as the heat from the turbo housing leaches into the exhaust manifold and the pre-turbo EGT probe.

Do you undastan grasshoppa?

 

So, if I'm crusing down the highway, the BEFORE turbo probe will read higher, but once I pull into a parking lot the AFTER turbo will read higher

Right ??

Going with the +300 degree thing that you guy's told me about, if I'm crusing down the highway and I have my probe mounted AFTER the turbo and I'm getting am EGT reading of 1000 degress, I can assume that it's about 1300 degrees BEFORE the turbo then right?

Am I getting it ??

 

Okay, back to the topic. I know a turbo timer is a turbo timer, but do diesel guys buy certain brands or the same ones the ricers guys use such as Greddy, APEXi and so forth....?

 

I use the one that is on my Attitude monitor. It can be set for time or EGT.

Because I have my EGT probe pre-turbo, I use the time function.

Normally, I leave it on 1 minute and all I have to do is pull the key and walk.

If I was loaded up on the highway, I'll set it to 2 minutes.

If I was really pulling hard and just came off the highway, a hill, etc., I'll bump it to 5 minutes.


And yes Mayfair, you are correct. Most likely though, on the highway at a cruise, you are gonna see very similar temps. The gases are moving fast and freely, so no a lot of heat soak takes place. The biggest difference you see is under a load or accelerating hard.

 

you know the other thing not mentioned here (that I can see) is the use of synthetic oil... much higher flash point than dino oil and is more resistant to the coking problem associated with the turbos and not letting them cool down. I run the amsoil and have the timer on my TST and still let it cool for at least a minute or 300 deg, which ever comes 1st.

 

Is there any particular type or brand that is better than another??
Are there any that would be plug n play on an 05?
What would y all recommend?