Oil Temperature
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Tuned
Joined: Feb 2007
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Oil Temperature
I am considering purchasing a turbo temp monitor, but would first like to know how the Engine Oil Temp reading being sent through the OBD II connector on my 1999 F-350 7.3 Power Stroke may relate to the temperature at the turbo?
How much of a difference is there, plus or minus, between the temp I read as Engine Oil Temp and the temp of the oil cooling the turbo?
Thank you
How much of a difference is there, plus or minus, between the temp I read as Engine Oil Temp and the temp of the oil cooling the turbo?
Thank you
Posting Guru
Joined: Jan 2007
Posts: 2,174
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From: Millersburg, OR
It reads oil temp at the back side of the HPOP reservoir.
Your oil temp in your HPOP is likely more then your turbo. I don't know for sure, otherwise they would put the sensor in a different place?
Your oil temp in your HPOP is likely more then your turbo. I don't know for sure, otherwise they would put the sensor in a different place?
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Tuned
Joined: Feb 2007
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Given the statement above from Layson, am I correct in thinking that if my oil temp reading through the OBD II is less than 300 degrees, the temp at the turbo is also less than 300 degrees?
Post Fiend
Joined: Mar 2007
Posts: 26,966
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From: Texas
If your engine oil temp at the HPOP hits 300 deg, you've got much more to worry about than a turbo. Engine coolant is designed to keep the engine cool. Oil around the EOT sensor will likely always be below 200 deg F.
If you're interested in a turbo cool down timer, that basically has to do with the fact that the turbo shaft spins MUCH faster than any other engine component, so allowing the shaft speed to slow down and cool with a good flow of oil will extend the life by preventing coking or degradation of the oil film around the shaft.
In my opinion you'd be better off watching a clock that watching EOT. Of course it's been a really long day and I've had a few, so if I missed something here, someone please jump in and correct me.
If you're interested in a turbo cool down timer, that basically has to do with the fact that the turbo shaft spins MUCH faster than any other engine component, so allowing the shaft speed to slow down and cool with a good flow of oil will extend the life by preventing coking or degradation of the oil film around the shaft.
In my opinion you'd be better off watching a clock that watching EOT. Of course it's been a really long day and I've had a few, so if I missed something here, someone please jump in and correct me.
Post Fiend
Joined: Mar 2007
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From: Texas
Are you sure? He mentions reading the temp in the down pipe and makes the following comment:
Sounds like he's curios about the oil temp at the turbo. Perhaps the 300 deg EGT number wasn't meant to be related to the oil temp question and I just misunderstood.
........ but would first like to know how the Engine Oil Temp reading being sent through the OBD II connector on my 1999 F-350 7.3 Power Stroke may relate to the temperature at the turbo?
How much of a difference is there, plus or minus, between the temp I read as Engine Oil Temp and the temp of the oil cooling the turbo?
How much of a difference is there, plus or minus, between the temp I read as Engine Oil Temp and the temp of the oil cooling the turbo?
Posting Guru
Joined: Jan 2007
Posts: 2,174
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From: Millersburg, OR
Yes, little confusion here... Engine Oil Temp and Exhaust Temps are not related. You want to install that pyro post turbo, right in the manifold.
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Tuned
Joined: Feb 2007
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Here's a link to what I am thinking of getting: ISSPRO Turbo Temp Monitor R4130 at DieselManor
It says "Standard shutdown temperature is 300° F" which from the context I take to be exhaust temperature. The statement is also made "By shutting down in a cool condition, deposits are reduced and turbo life is increased." I take those "deposits" to be coking of the oil cooling the turbo.
I was wondering if there is any correlation between the EGT post turbo, the temperature of the oil cooling the turbo, and the engine oil temp shown on the OBD II port.
It says "Standard shutdown temperature is 300° F" which from the context I take to be exhaust temperature. The statement is also made "By shutting down in a cool condition, deposits are reduced and turbo life is increased." I take those "deposits" to be coking of the oil cooling the turbo.
I was wondering if there is any correlation between the EGT post turbo, the temperature of the oil cooling the turbo, and the engine oil temp shown on the OBD II port.
Post Fiend
Joined: Jun 2004
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From: Parker, CO
If you want a turbo timer, that's fine. But I personally won't waste my money on one. Reason being is I don't think it's needed on a diesel. First, these engines run at much lower EGT's than gassers do. Second, they pump much more air through the engine (with much leaner fueling) than a gasser, so EGT's fall much quicker once the truck is at a stop. Third, oil today is much more resistant to coking than years ago, so it's actually very rare to see oil coking in the turbo on a diesel truck. Yes it's more common on a gasser, but it's extremely rare on a diesel.
That's my 2 cents.
The only thing I ever do is watch my pre-turbo EGT gauge. Once it drops below 400 degrees, I shut the engine off. It doesn't take long to cool off to those temps, and I rarely have to wait for the EGT's to fall.
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Joined: Feb 2009
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Well said Curtis.
The only reason I use one is because it is nice to not have to wait or if I'm at a stop I can pull the keys, leave it running and the A/C on.
The only reason I use one is because it is nice to not have to wait or if I'm at a stop I can pull the keys, leave it running and the A/C on.
