EGT
Submitted: Monday, Sep 13, 2004 at 17:45
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hoffy
Following up on post 15955 re Pyrometers, have any GU 3.0l owners out there fitted one to their truck.
I am interested to find out whether the probe was fitted upstream or downstream of the turbo. There doesn't seem to be much room on the manifold upstream which i understand is the best place to get an accurate picture of what temps are happening inside the combustion chambers.
Reply By: Member - John - Monday, Sep 13, 2004 at 18:34
Monday, Sep 13, 2004 at 18:34
I have a 4.2 TD GU and have fited the pyro about 3 " below the turbo. Hope that helps.
AnswerID:
76225
Follow Up By: hoffy - Monday, Sep 13, 2004 at 21:00
Monday, Sep 13, 2004 at 21:00
Thanks John.
What readings are you seeing on the gauge?
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336041
Reply By: Member - John - Monday, Sep 13, 2004 at 21:08
Monday, Sep 13, 2004 at 21:08
Hoffy, max of 950 F so far, bigger turbo, 3" Mandrel exhaust, fuel pump tweeak and timing tweak.
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Reply By: Martyn (WA) - Monday, Sep 13, 2004 at 21:22
Monday, Sep 13, 2004 at 21:22
Hoffy,
The pyro has to go downstream of the turbo as close to the wastegate as possible to get a true indication of the turbo temp. I don't have one in my 3.0 td but I had one in my 4.2 TD GQ. The thermo couple I had was mounted about 50 mm from the turbo flange, that was as practically close as I could get it. the temps usually hovered around the 300 - 350 degree c mark, up hills with the camper trailer might get to around the 475 degrees that was the point at which I changed down a gear, if you get around the 600 degree mark your in trouble in my opinion, especially at the thermo couple. I usually found that if the engine started to struggle going up hills etc by the time the temp was getting into the danger zone in the higher gears it was getting over fueled and starting to smoke so the temp was starting to come down. If you play with the boost pressure and get more air in this is where the temps go up, the engine is over stressed and things start to break / melt / gaul.
This is all information I've learned myself how good it is to you I don't know, some of the info is fact, some is experience.
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Follow Up By: Bonz (Vic) - Monday, Sep 13, 2004 at 22:23
Monday, Sep 13, 2004 at 22:23
Gaul?
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Follow Up By: Member - Chris M (QLD) - Tuesday, Sep 14, 2004 at 08:06
Tuesday, Sep 14, 2004 at 08:06
Your right there Martyn! Some think it's better for the motor to leave it in 5th up a range and let it struggle. But from experience, E.G.T's and the motor will run much cooler knocking it back to 4th, even if the rpm's are a little higher.
Also depends on what sort of turbo you run. I don't know about the standard turbos on the GU's yet (which I think are garretts, correct me in I'm wrong) but on my Schweitzer (spell) in the GQ running 12psi, I was informed that I could safely take it to 650. The comp guys take theres up to 800 on short stretches, hence the short life of both the turbo and motor.
I generally will back off and or change down at around 550 degrees.
Cheers,
Chris.
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Follow Up By: Martyn (WA) - Tuesday, Sep 14, 2004 at 19:58
Tuesday, Sep 14, 2004 at 19:58
Yea Bonz gaul, like Asterix, you know, sorrreeee should of been gall, rub, pick-up, one material deposits on the other unintentionally, you know what I mean LOL
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Reply By: Truckster (Vic) - Monday, Sep 13, 2004 at 22:01
Monday, Sep 13, 2004 at 22:01
Mine on my GQ is a few inches past the turbo on the outlet side.
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Reply By: Willem - Monday, Sep 13, 2004 at 22:43
Monday, Sep 13, 2004 at 22:43
Hi Hoffy,
Just letting you know that your old G60 has been retired to a station in the
Flinders Ranges where it will serve as a back up work vehicle. It served me
well in the 6 years I owned it and it still has many more days left in it.
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