EGT TEMPS ON 4.8 PETROL PATROL
Posted: 15 Oct 2018 09:34
Good morning all
I am looking for a couple of pointers here..
I installed a VDO Egt Gauge when I had my Patrol super-charged, but even though I thought I would pay proper money for a decent gauge, there was no indication as to where one should actually fit the probe.
We ended up fitting it at the accumulation point where the two downpipes come from the manifold.
Now its obvious that wherever you mount the probe will affect the reading.
It was determined by RGM that the accumulation point would be the hottest point.
In all reading on various forums, EGT probes are mostly fitted to diesels and it seems the bench mark safe temp is around 650 degrees.
Any Idea what it should be for the 4.8 Petrol motor.
In general driving, without really pushing at all I can easily see 750 degrees, if I push it I can go to 880 degrees. The gauge itself only reads to 900!!
So it seems to make the whole gauge installation superfluous. This on a petrol motor.
So lets say I push on and sit at a steady 150 km/hr, the EGT Gauge will sit at around 750 to 800 degrees.
I also have an oil temp gauge and that shows oil as being just on operating temp.
The third line after zero, so oil remains cool.
Is it possible the thermo-couple is faulty, or are the temps I am seeing pretty much what I should expect?
It may be worth mentioning that taking the foot off the pedal sees an immediate drop in EGT readings.
My issue is I have no bench-mark parameter to interpret what I am seeing on the gauge and naturally I want to make sure that I’m not running too hot etc.
The issue then is the temps are way up on the chart regardless, even a gentle cruise will see me at around 700 degrees.
Any advice, pointers or opinions would be appreciated.
I am looking for a couple of pointers here..
I installed a VDO Egt Gauge when I had my Patrol super-charged, but even though I thought I would pay proper money for a decent gauge, there was no indication as to where one should actually fit the probe.
We ended up fitting it at the accumulation point where the two downpipes come from the manifold.
Now its obvious that wherever you mount the probe will affect the reading.
It was determined by RGM that the accumulation point would be the hottest point.
In all reading on various forums, EGT probes are mostly fitted to diesels and it seems the bench mark safe temp is around 650 degrees.
Any Idea what it should be for the 4.8 Petrol motor.
In general driving, without really pushing at all I can easily see 750 degrees, if I push it I can go to 880 degrees. The gauge itself only reads to 900!!
So it seems to make the whole gauge installation superfluous. This on a petrol motor.
So lets say I push on and sit at a steady 150 km/hr, the EGT Gauge will sit at around 750 to 800 degrees.
I also have an oil temp gauge and that shows oil as being just on operating temp.
The third line after zero, so oil remains cool.
Is it possible the thermo-couple is faulty, or are the temps I am seeing pretty much what I should expect?
It may be worth mentioning that taking the foot off the pedal sees an immediate drop in EGT readings.
My issue is I have no bench-mark parameter to interpret what I am seeing on the gauge and naturally I want to make sure that I’m not running too hot etc.
The issue then is the temps are way up on the chart regardless, even a gentle cruise will see me at around 700 degrees.
Any advice, pointers or opinions would be appreciated.