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  #1  
Old 10-05-2019, 05:08 PM
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Default Exhaust Temps 2.8

So I have popped in a new thermocouple (after damaging the previous one) and I took the patrol for a quick spin up a hill.

Just some background info for reference:

Car is a 1999 2.8 GU with a factory exhaust and factory turbo. No performance mods or upgrades. I have a thermocouple mounted about 50-100mm from the turbo flange on the top of the dump pipe. The tip of the thermocouple sits in the middle of the dump pipe.

The max temp I got was 480c doing 80 kph in 4th (just belowt 3k rpm) with about 50% throttle (or 2.50V TPS) up a small but steepish hill. I sustained these temps for about 20-30 secs before backing off. Flat road would get up to about 380c before dropping when throttle was reduced.

Is this a reasonable temp? Is it too high for a stock 2.8? If it is acceptable, is it sustainable for minutes rather than seconds? What is the point of no return in terms of high temps?

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Old 10-05-2019, 06:10 PM
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Originally Posted by gu_2.8 View Post
So I have popped in a new thermocouple (after damaging the previous one) and I took the patrol for a quick spin up a hill.

Just some background info for reference:

Car is a 1999 2.8 GU with a factory exhaust and factory turbo. No performance mods or upgrades. I have a thermocouple mounted about 50-100mm from the turbo flange on the top of the dump pipe. The tip of the thermocouple sits in the middle of the dump pipe.

The max temp I got was 480c doing 80 kph in 4th (just belowt 3k rpm) with about 50% throttle (or 2.50V TPS) up a small but steepish hill. I sustained these temps for about 20-30 secs before backing off. Flat road would get up to about 380c before dropping when throttle was reduced.

Is this a reasonable temp? Is it too high for a stock 2.8? If it is acceptable, is it sustainable for minutes rather than seconds? What is the point of no return in terms of high temps?

Cheers
Nothing wrong with that, about what people aim for. You should be able to sustain low 500's for quite a while.
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Old 10-05-2019, 06:12 PM
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Nothing wrong with that, about what people aim for. You should be able to sustain low 500's for quite a while.


Ahh ok sweet. So they can only go down from that then once I put on a new exhaust.


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Old 10-05-2019, 06:18 PM
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Ahh ok sweet. So they can only go down from that then once I put on a new exhaust.


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Quite likely but not necessarily.
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Old 10-05-2019, 06:22 PM
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When i go up the up track i'd easily get over 500c if i didn't "drive to the gauge" usually sit on 450c in 3rd (O/D off) and modulate the throttle to keep it under.

Where you full noise the whole way and only 480c?
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Old 10-05-2019, 06:23 PM
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Originally Posted by Softy View Post
When i go up the up track i'd easily get over 500c if i didn't "drive to the gauge" usually sit on 450c in 3rd (O/D off) and modulate the throttle to keep it under.

Where you full noise the whole way and only 480c?


About 50-60% full beans for about 20-30 secs before I backed off. It dropped below 450c then


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Old 10-05-2019, 07:13 PM
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Totally fine temps.
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Old 10-05-2019, 07:14 PM
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Totally fine temps.


Are they damn fine? haha


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Old 10-05-2019, 08:20 PM
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Are they damn fine? haha


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lol 10/10 fine
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Old 10-05-2019, 08:22 PM
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lol 10/10 fine


Out of curiosity what temps do you see in your 4.2?


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Old 10-05-2019, 09:25 PM
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I didn't have an EGT gauge in mine when it was stock, only after I put the Beaudesert 2 3/4" exhaust & cheap ebay chip on it. I don't think I've ever seen over about 450C & that's up hills in 3rd or 4th gear, foot flat to the floor. I think with a bigger exhaust yours will drop a bit too.
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Old 10-05-2019, 09:44 PM
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I didn't have an EGT gauge in mine when it was stock, only after I put the Beaudesert 2 3/4" exhaust & cheap ebay chip on it. I don't think I've ever seen over about 450C & that's up hills in 3rd or 4th gear, foot flat to the floor. I think with a bigger exhaust yours will drop a bit too.


Yeh that is my thinking. The main reason behind chucking it in the stock exhaust was to see what improvements an exhaust really has. Also it was good experience working on the patrol.

Is yours a 2.8?


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Old 10-05-2019, 09:45 PM
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Out of curiosity what temps do you see in your 4.2?


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around street flat I see around 250 to 300
Up hills about 480 as well.

Idling about 70 degrees to low as 30 degrees
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Old 10-05-2019, 09:48 PM
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a
Idling about 70 degrees to low as 30 degrees
That isn't a true reading..

No way any exhaust puts out that low of a reading... You pyro would have have a min of 200c
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Old 10-05-2019, 09:50 PM
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Quote:
Originally Posted by Softy View Post
That isn't a true reading..



No way any exhaust puts out that low of a reading... You pyro would have have a min of 200c


I agree with 30 being too low. 70 might be possible. My pyro reads 0-1100c


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Old 10-05-2019, 09:55 PM
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Quote:
Originally Posted by drgtr View Post
around street flat I see around 250 to 300
Up hills about 480 as well.

Idling about 70 degrees to low as 30 degrees
Mine will drop to 150c at idle, but generally runs mid 200's - 300c when cruising general terrain. The other day I was pushing it hard up a long hill in 4th with the new turbo on and it hit 500c, it was being worked hard.
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Old 10-05-2019, 09:57 PM
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Quote:
Originally Posted by geeyoutoo View Post
Mine will drop to 150c at idle, but generally runs mid 200's - 300c when cruising. The other day I was pushing it hard up a long hill in 4th with the new turbo on and it hit 500c, it was being worked hard.


Would you consider 500 to be the threshold for your patrol or would it cope with a few more degrees?


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  #18  
Old 10-05-2019, 10:02 PM
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Quote:
Originally Posted by gu_2.8 View Post
Would you consider 500 to be the threshold for your patrol or would it cope with a few more degrees?


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It is generally accepted that a DI be kept at 550c or below (this with senor mounted roughly where you have yours), brief higher readings are fine as long as not kept there, the CRD is a different animal they cope with 650c. If I was you I would be sticking with what a DI is judged by.
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Old 10-05-2019, 10:07 PM
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Quote:
Originally Posted by geeyoutoo View Post
Mine will drop to 150c at idle, but generally runs mid 200's - 300c when cruising general terrain. The other day I was pushing it hard up a long hill in 4th with the new turbo on and it hit 500c, it was being worked hard.
Agree with Ross on the minimum temps.
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Old 10-05-2019, 10:17 PM
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Quote:
Originally Posted by Softy View Post
That isn't a true reading..

No way any exhaust puts out that low of a reading... You pyro would have have a min of 200c

good point.
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