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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

       
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Old 11-14-2007, 09:56 PM   #1 (permalink)
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EGT probe- does is wear out like a oxygen sensor?

My pump is pretty turned up, and my timing is dead on. I have a 57 trim compressor wheel (larger diameter wheel, less blades)...which makes me think that it's flowing more air than the stock Banks TE06H.

What I don't get is: even when pulling a car hauler up hill, the EGT's never get above 700* Is it possible that the EGT probe could be wore out? Gauge not reading correctly? Is it possible that the pyrometer lead is so long that resistance is building up? Keep in mind that I've cranked up the pump one flat past what banks reccomends. Thanks in advance for your take on this matter.
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Old 11-14-2007, 10:06 PM   #2 (permalink)
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Re: EGT probe- does is wear out like a oxygen sensor?

Where is your probe located? Before or after the turbo?
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Old 11-14-2007, 10:08 PM   #3 (permalink)
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Re: EGT probe- does is wear out like a oxygen sensor?

I forgot to tell you that the truck is a smoker starting out in second, but doesn't smoke in any other gear. The only time I see it smoke is when I leave a red light. (smoked a lady behind me out pretty good one time; had her tell me that my truck needed a mechanic!) HA!
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Old 11-14-2007, 10:10 PM   #4 (permalink)
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Re: EGT probe- does is wear out like a oxygen sensor?

The probe is just before the flange where the turbo bolts up.

(before the turbo)
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Old 11-15-2007, 12:39 AM   #5 (permalink)
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Re: EGT probe- does is wear out like a oxygen sensor?

That sounds about right. The highest I've ever seen out of mine is about 625, and I see a light haze of smoke at the worst. Do you have the Sidewinder kit or the old non-wastegated like mine? The non-w/g kit has about 3 feet of tubing between the exhaust manifold and the thermocouple, so they say we could show about a 300 degree drop from the manifold temps, which puts you at 1000. That's still safe. I'm not sure what the manifold setup for the Sidewinder is like.

I have a pyrometer gauge out of a Kenworth semi truck, and probably 5 feet of lead between it and the thermocouple.
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Old 11-15-2007, 01:25 PM   #6 (permalink)
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Re: EGT probe- does is wear out like a oxygen sensor?

The length of the leads is intentional from the factory- do NOT cut it. The company has the gauge calibrated for the x amount of resistance of the thermocouple itself and the wire leads, which probably isn't much, but I still wouldn't advise cutting it.
Also, I wouldn't reccommend using different brand thermocouples and gauges.
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Old 11-15-2007, 02:58 PM   #7 (permalink)
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Re: EGT probe- does is wear out like a oxygen sensor?

I was actually thinking about ordering an auto meter pyro gauge from summit; what do you see wrong with changing the gauge? Maybe order another gauge from Banks?

I found this whole wastegated sidewinder system(to answer your question, Arthurgoboom) in a junkyard for 200.00. I don't know the history of the thermocouple or the gauge, but I do know that the engine came apart, and chewed up the exhaust wheel pretty good. (this is probably why it was in the junk yard) I reused the thermocouple because it didn't appear to have any damage.
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Old 11-15-2007, 04:29 PM   #8 (permalink)
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Re: EGT probe- does is wear out like a oxygen sensor?

I don't think you will be too inaccurate, but nonetheless it could be off. I would call autometer and ask them about it. I'm sure banks gauges are made by the same company as autometer...
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--motor/trans sold--

2000 VW Jetta TDI = 48+mpg
1997 Dodge 3500: 2WD Cab & Chassis, 12V Cummins, 47RE Automatic, Dana 80, 194,000mi. Parting out.
1989 12V VE Cummins out of Chevy C60? at the machine shop...going into the Ford.




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Old 11-15-2007, 07:55 PM   #9 (permalink)
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Re: EGT probe- does is wear out like a oxygen sensor?

get an isspro their awesome I have autometer in mine right now and it sucks my buddy got is isspro and his pyro is like a rpm gauge its senstive and fast. mine is so slow and its an autometer C2
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Old 11-16-2007, 01:28 AM   #10 (permalink)
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Re: EGT probe- does is wear out like a oxygen sensor?

Reaction speed of a thermocouple (pyrometer probe) depends on how much shielding is around the actual joint where the 2 wires meet. All of the thermocouples designed for EGT use have a stainless steel shield around the outside, the thicker this is, the longer it takes for temperature changes to register. The upside is with a thicker shield you are less likely to melt the shield and spit it through the turbine wheel (if you have a turbocharger).
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Old 11-16-2007, 07:27 PM   #11 (permalink)
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Re: EGT probe- does is wear out like a oxygen sensor?

Actually, a lot of EGT sensors have switched to Inconel (Alloy 600) which has a higher melting temp than stainless, so they can swage it down thinner for better response. ISSPRO advertises Inconel tipped thermocouples which may explain their quicker response time.
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Old 11-16-2007, 10:17 PM   #12 (permalink)
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Re: EGT probe- does is wear out like a oxygen sensor?

Interesting...I did not know that. I don't like getting my motor anywhere close to being 'iffy' as far as nuclear meltdowns go...I want to be at a comfortable temperature...
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1994 Ford F250 4x4: 7.3L IDI factory turbo, supercab longbed, E4OD *DEAD*. ZF5 swap,Dana 60 swap, GM 14 bolt rear w/ 4.10s, 4" exhaust from stock downpipe back to a 5" stack, IP maxed=1100 degrees max pulling uphill, "modified" wastegate=11psi max,99+ F450SD cab/chassis leaf springs in rear
--motor/trans sold--

2000 VW Jetta TDI = 48+mpg
1997 Dodge 3500: 2WD Cab & Chassis, 12V Cummins, 47RE Automatic, Dana 80, 194,000mi. Parting out.
1989 12V VE Cummins out of Chevy C60? at the machine shop...going into the Ford.




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