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Turbo question.

D

DeltaRed

Well-known Member
Where is the best place to put the pyrometer sensor? Before the turbo, or after the turbo? My 706(D310)has the sensor between the manifold and the Turbo. The tractor tends to run a little warm. It was dyno tested at 96 horse about 5 years ago.It was turboed 35 years ago.It has nearly 13000 hrs,6500 of those with turbo
I wonder if it would run cooler and more accurate if the sensor was after the turbo. I worry about the sensor coming apart and going through the turbo blades.That would get ugly
But,it's been trouble free,so this is most likely a mute point

cvphoto80259.jpg
 
Put it before or you have to use a lower number for max temperature. Before the turbo I run 13 as 1450 for short times I will Run 1300 pre turbo all day
 
If the pyrometer probe is after turbo, exhaust temp will be about 200 degrees less than before turbo. Some IH Blue Ribbon service specs call for 1300-1350 degrees before turbo, and if turbo is matched well to engine the EHAUST manifold pressure will be 1-2 below the INTAKE manifold pressure when under full load.
 
Always before turbo for accurate data. the further away from the engine or after turbo you will have cooler temps and more lag on temps. Most people agree 1200-1250 sustained for a small cushion, but 1300 is still safe. These temps are for before turbo.

After turbo temps are not linear to before temps, meaning you can't just add 200* to calculate before turbo temps. I've seen variances around 500-600* cooler after the turbo.
 
All the engines I've seen were after turbo and run no more than 900-1000. Though with those big horse Cats guys must be running them hotter since they are always changing turbos around 3-500,000 miles. Mine was on till over a 1,000,000 miles and finally wore out the fins. No boost so had to replace. C-15 Cat single turbo. All our tractors are after turbo.
 
Depending . If they are not turned up above more then 10% before the turbo but when ya have the wick turned up it is wise to install after the hot side a few inches . This way if you happen to melt the probe off it goes up the stack not thru the hair drier . When i had my semi and had it wound for sound and shooting for one hp per cube i had the probe 6 inches back from the turbo in the pipe and would see temps up to 1250 Yes she would glow . Headed east one night on I 80 with a charge on as i blew by everybody someone made the comment of how he loved the glow the red lights i had under the truck made on the road . Told him i did not have ANY red lights under the truck that was the exhaust . As she was setting at 1250 pushen 68 lbs of boost 590 Psi fuel pressure and running 72 Mph in 12th at 2150 RPM with 98 and change in the wagon of scrap copper .
 
We had a tg 235 new holland on the feed yard and grinding high moisture corn kernels for silage The whole turbo and exhaust manifold would glow bright red a 1300 degree infrared thermometer couldnt even come close to reading it
 
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