Ranger Mods

All,
Had a few spare minutes and thought I'd share a graph of the 3 EGT sensors used during a stock PX3 3.2TD DPF regen. There's nothing special about this regen, it looks like others that have happened during some data logging. My vehicle has a few basic mods but nothing exciting (runs std wheels and tyre size).
The regen started just before I went through a country town while on a 80-90 km/h country road. About 1/2 way through the regen, I was back out on a 100km/h rural road. The time taken from start to finish of the regen was 15 minutes.

Some things you might like to note are:
- The reference line for the EGT sensors is set at 600C.
- I have a picture below showing the location of the 3 EGT sensors. The EGT sensor in the exhaust manifold is used for EGR operation and is known as EGRT. It is NOT the EGT11 sensor.
[Link here to compare pre and post turbo temps (EGRT vs EGT11)]
- While some DPF EGT temps do bump over 600C, they get managed to mostly stay under 600C. (but will still cook a steak)
- EGT12 (middle of DPF) gets hottest.
- EGT11 (front of DPF) varies temp quite a bit and is effectively the post-turbo temperature. It doesn't have the DPF soot and substrate mass to moderate the temp swings.
- EGT12 and EGT13 stay more constant during the regen and reflect the constant burning of the ash (once lit) within the DPF.
- If EGT13 (rear end of the DPF) dips below about 535C and the regen is incomplete, then more fuel is added (EGT11 gets hotter) to get things burning again. Once the EGT13 temp is back up, extra fuel is removed or at least backed off (It's quite a dynamic feedback loop).
- The regen cycle does not measurably limit engine power (Nm), and the EGT12/13 temps are quite independent of load on the engine during regen.
- Overall, injection timing is retarded further during the regen cycle to pump heat into the exhaust.
- Overall, the engine - even when not doing a regen - is tuned with retarded timing except under heavy load. I assume this helps keep NOx emissions down.
- While the engine torque looks like it gets close to 550Nm (versus advertised 470Nm), it's a stock tune. (I think it's a scale issue)

(The values on the left of the graph reflect where the vertical white line is. The scale is on the right hand side.)

Australian PX3 3.2TD DPF Regen Australian PX3 3.2TD DPF exhaust

Hi Ian, are the EGT sensors for the 2ltr the same as your illustration above? Just starting to monitor mine and trying to understand how it works so I know if there is a problem.
Cheers, Adam

Not sure, I haven't played with a milk bottle engine.
Having said that I'd expect to see something similar on the same sensors.