where's ya probe

[benno77gu]

hi fellas this seems like a good deal ,I was wondering where about is the best place to fit the probe on the exhaust I have a t42td with a 3"straight thru system , cheers

[threedogs]

I would imagine there is heaps written about this in the archives have a search,
but 150mm past the turbo sounds familiar

[MudRunnerTD]

Post turbo in the dump pipe. Does your straight through have a bung?

[benno77gu]

Post turbo in the dump pipe. Does your straight through have a bung?

hi mud, no bung I need to weld one on, cheers

[threedogs]

This may help you.
http://www.nissanpatrol.com.au/forums/showthread.php?9564-Installing-a-Boost-and-Pyro-Gauge

[slamnsam]

i usually aim for between 120 and 150mm

[04OFF]

Agree with the others, make sure its no further than 150mm (6 inches) from the exhaust side of the Turbine housing (the face where the exhaust bolts to the Turbo)

[benno77gu]

thanks fellas I ended up installing the probe 50mm from the dump pipe flange got the egt up and running the hottest it has got so far is 550 degrees up hill with a fully loaded camper on

[NotTortoise]

Hey Benno, I was looking at the same kit and was looking at the probe. Is the probe too long? any dramas fitting it on the 3" pipe?

[the evil twin]

Best place is pre-turbo.

Post turbo is not an accurate measurement of the combustion temperatures and we are left with making an estimate of the delta T across the turbo and guessing the true combustion temps.
But, there is always a but, post turbo is popular because you can drill the pipe with everything assembled and not worry about metal getting in the turbo.

If you are in the situation of having the manifold off or whatever so you can clean out the swarf then it is a no-brainer... pre Turbo is heaps more reliable and lots more accurate.

That is a cracking good price for the kit and you should only insert the thermocouple so the tip is in the centre of the flow IE 3 inch pipe, tip goes in 1 1/2 inches from the wall.
To shallow or to deep and you start to get errors from the wall of teh pipe

[seekers282]

whats the normal heat range?and the warning range in degree for zd30 egt temp?

[seekers282]

correction..in celciusmy bad

[seekers282]

what if i place the egt probe directly at exhaust manifold before the turbo?will it melt the adapter?

[BigRAWesty]

I think 150mm is so the air has time to settle, but temps won't drop much in that distance.
The turbo adds a bit of heat to so yes post turbo is the way

[seekers282]

evil twin..any picture on where the pre turbo location for the probe..since i havent install the ext manifold yet..

[the evil twin]

I think 150mm is so the air has time to settle, but temps won't drop much in that distance.
The turbo adds a bit of heat to so yes post turbo is the way

Hiya Westy

The Turbo harnesses the high temp exghaust gas and drops the temp, it doesn't add any.
By how much is quite variable and usually guesstimated to be 150 to 200 C IE 750 deg combustion temps pre turbo will show as 550 to 600 post Turbo
In the ZD30 factory turbo to err on the safe side we accept it to be 200 and don't want to exceed 750 momentary or 700 prolonged.
Soooo, if it a post turbo EGT (within 150mm of the outlet) shows 500 it is assumed the peak temps are heading towards 700.

This means that you can actually be exceeding the safe temp or not using the full amount of power available depending on individual installations, engines, Turbo efficiency etc.



evil twin..any picture on where the pre turbo location for the probe..since I havent install the ext manifold yet..

I have no pic's but Google should find you some.
I think some people have used the EGR close to #3 on the ZD30's

[BigRAWesty]

Hiya Westy

The Turbo harnesses the high temp exghaust gas and drops the temp, it doesn't add any.
By how much is quite variable and usually guesstimated to be 150 to 200 C IE 750 deg combustion temps pre turbo will show as 550 to 600 post Turbo
In the ZD30 factory turbo to err on the safe side we accept it to be 200 and don't want to exceed 750 momentary or 700 prolonged.
Soooo, if it a post turbo EGT (within 150mm of the outlet) shows 500 it is assumed the peak temps are heading towards 700.

This means that you can actually be exceeding the safe temp or not using the full amount of power available depending on individual installations, engines, Turbo efficiency etc.




I have no pic's but Google should find you some.
I think some people have used the EGR close to #3 on the ZD30's

Ow ok. Thought the friction would have added a little..

[seekers282]

so the actual warning zone is at 550-600 deg post turbo?

[the evil twin]

so the actual warning zone is at 550-600 deg post turbo?

Mine is a CRD which anecdotally seem to run a little hotter than the Di.

I look for another gear at 500 and back off at 550 degrees indicated "post turbo".

IMHO that is definitely less than the ECU will run the engine at in a factory truck so should be low enought to prevent any damage due to eces combustion temps caused by the modd's I have done.

Others may disagree which is OK, it's just what I do.