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Project Pajero EGT (Pyrometer)

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KGogarty
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Age: 31
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Location: Meath - Ireland

PostPosted: Wed Jan 07, 2015 12:36    Post subject: Reply with quote

Thanks lads.  I was concerned with the blanking plate shoved off in a corner but have found a probe 5 inches long, plan would be to weld on a short piece of 10mm tube at an  angle to the blank plate and and then thread the probe over towards the cylinder outlets.

I have since read a few of the diesel tuners in the US are suggesting a max of 1000 F on any kind of normal road going truck, 1200 under extreme towing conditions saying they run 1400 in the sled pulling trucks and rebuild the engine once per season.

My arduino arrived this morning so I intend to route it through that and create a data logger to gather some benchmark data before I begin to tune
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PostPosted: Wed Jan 07, 2015 12:36    Post subject: Google Ads keep the POCUK free to join!


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trekker
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Location: Zimbabwe

PostPosted: Sat Jan 10, 2015 13:43    Post subject: Reply with quote

Having chatted with turbo and diesel engine repair specialists over the years, it seems the single biggest reason for turbo and valve stem burning in this part of the world is flat out driving when towing.

From Harare to Lake Kariba is around 400 km, the road in parts hilly, and most of the time good for 120 kph. Macho guys earn bragging points for how long this drive takes, especially with his laded truck, with laded boat in tow.

I guess these engines are fitted with both glow plugs and glow turbos.  Laughing

I rarely leave my engine idling when I finally stop on a trek, because I manage the last km or so at low throttle, allowing cooling of the engine and turbo to take place whilst still driving.
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Roadrunner2110
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PostPosted: Sat Jan 24, 2015 20:20    Post subject: Reply with quote

trekker wrote:
The EGT sender unit needs to be in the gas flow. Setting this sender in a dead pocket won't reflect the true gas temp into the turbo.

The blanking plate looks convenient, but not the best.


X1 agreed, one would need to extrapolate the readings if sited in the EGR exhaust pocket. Just a very rough guesstimate but I reckon the exhaust gas temperature out of the main stream may be as much as 10-20% cooler through the EGR blanking plate. A test between the EGR pocket and main exhaust gas flow would establish this variable.
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Roadrunner2110
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PostPosted: Sat Jan 24, 2015 20:30    Post subject: Reply with quote

Question: what will you do with this data once you have installed the EGT and possibly established the engine is running correctly or not, whatever the case, or is it just another gauge too many in the truck. IM humble opinion an exhaust gas analyser (Lambda sensor) would be far more useful in telling the state of air/fuel 'burn' rather than just exhaust gas temperature.
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moose88
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PostPosted: Tue Jan 27, 2015 20:18    Post subject: Reply with quote

This is very helpful to me as I plan on tuning my turbo and pump on my 2.5, and I think I will tap my sensor into the downpipe off the turbo to get a correct reading.
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Mr.Doug
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Location: Alberta, Canada

PostPosted: Mon Mar 07, 2016 18:26    Post subject: Reply with quote

I live in Alberta Canada and highway speeds I'm at 800-1000℉ full throttle it will go over 1200℉ easy I haven't let it do that yet though any reason why mine would be running so hot? Just had New injectors built full 2.5 inch exhaust just seems pretty hot and it's not even summer yet!!
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lotuselisel
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PostPosted: Tue Sep 29, 2020 11:46    Post subject: Pajero 4M40 EGT Exhaust Temperature & sensor placement. Reply with quote

I've installed my EGT sensor at the EGR blanking plate. Seems that this location gives 10-20% cooler reading? If the reading here is too inconsistent, WHERE is the best place for the EGT sensor? Finally, what is the max safe temp for a 4M40 engine. THANK YOU!
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