Now that I have a OBD2 MX, during cool down, what is the proper maximum temperature I can shut down the engine in order to prevent any turbo damage?

 

2017 Super Duty Diesel 6.7L Owners Manual

SWITCHING OFF THE ENGINE

- 6.7L DIESEL
Switch the ignition off.
To help prolong engine life, we recommend you allow the engine to idle
for three to five minutes, especially after any of the following:
• Continuous engine speed.
• High ambient temperature.
• High GVW or GCW operation, for example heavy loads or trailers.
This allows the turbo charged engine to cool down.

ENGINE IDLE SHUTDOWN (If Equipped)
Your vehicle may be equipped with an engine idle shutdown system. This system automatically shuts down your engine when it has been idling in P (Park) or N (Neutral) for five minutes (parking brake set) or 15 minutes (parking brake not set).
When the engine idle shutdown process has started:
• A chime sounds and the information display will show ENGINE TURNS OFF IN 30 (seconds) and start counting down
• You can restart the five or 15-minute timer by changing the position of the accelerator pedal, brake pedal or the park brake within the final 30 seconds
• When the timer reaches zero, the engine shuts down and this message will appear in your information display

ENGINE TURNED OFF
• One minute after the engine has shut down, the electrical system simulates key off, even though the ignition is still in the on position, initiating normal accessory delay period
• You must move the ignition to the off position to reset the system before restarting your vehicle.

181
Super Duty (TFE) Canada/United States of America, enUSA, Edition date: 201702, Third Printing

Starting and Stopping the Engine
The engine idle shutdown idle timer does not start if:
• The engine is operating in power take-off mode.
• The engine coolant temperature is below 60°F (16°C).
• The exhaust emission control device is Regenerating.

 

If the oil temp is at 201 or lower I shut it down. When I tow heavy on flat highway it runs 207-210. When driving unloaded it runs 196-201 depending on outside temps.

The previous poster listed a few conditions where the automatic timers kick in. So it towing heavy get oil at a min 207 then I would want to let it cool down to around 200 before shutting down.

 

Yeah, I know what the manual says, but I’m looking for a EGT number that equates to. Thanks

 

Thanks RedRocket...

 

The 7.3 is an entirely different engine but the generally accepted shut down number for it was a post turbo pyrometer reading of 300 degrees.
Below is a copy and paste from two previous posts I have made on the subject.

If you have information accessing and reading turbo temperatures, either pre or post I would be very interested. So far I am not aware of an accessible pyrometer for the turbo on the 6.7.

My previous posts....


I still have my '02 7.3 and have always used a cool down cycle, especially when towing. On my 7.3 I installed a device called ISSPRO Turbo Temp Monitor. This device takes control of the ignition after I park the truck, remove the key, and lock the doors. The engine will continue to run until EGT reaches 300 and then it turns the engine off. Truck locked and secured the entire time.
I posted more detail on this in a previous thread....

Auto Shutdown see post 12.

 

So if you DD your diesel truck...you have to let it sit and idle after you arrive at your destination? Or is this a procedure to perform after HD use like towing?

 

Really just for high load use. Daily driving or even long distance unloaded operation brings the truck to an equilibrium temperature that doesn't significantly change once you stop and idle the truck. By the time you come off the highway, pull into the gas station or parking spot, the turbo is about as cool as it needs to be and coolant temp is being controlled by the thermostat (vice wide open thermostat with temp controlled by air flow). EGTs unloaded on the highway are about 600 deg (EGT1), and idling in a parking lot are ~500 deg. Not much difference.
When hauling heavy, steady state EGT1 reads 800-1000 depending on load, and can get to 1100 or 1200 on hills or during a regen. If you promptly pull to the side and turn the truck off, the turbo is still sitting at a thousand degrees. That is the purpose of the three to five minute wait - let "cool" exhaust gasses at 500 degrees bring the turbo temp back town to a normal range (say <600 deg) before turning it off. Also, allows the cooling system to catch up and bring oil and water temps back under 215-ish (depending on where they were). Usually, just the off-ramp deceleration, stop, pull into station, maneuver to parking spot cools everything off so an extra idle time is not really needed. For comparison, this summer climbing the 6kft passes outside of death valley at 119 deg and loaded to 13klb (F450 with truck camper), it took less than a minute at the summit lookout for EGT1 to come under 600 deg after pulling the hill well above (I mean at) the speed limit.

 

So how is it you are reading your EGT temps?

 

I have an Edge CTS2. Lets me see all sorts of temps, DPF % (though not regen status) batt volts, etc. Also, a big digital speed indication that is correctable for tire size.

 

Thanks for the heads up, the Edge is a new product to me.

I can certainly look these answers up myself if it's a busy day for you but can you describe your installation including your chosen mounting position?

Are their limits to the tire size correction (for 37's specifically)?

I am assuming the speedometer correction shows up on the Edge, but not the Truck?

If you have dual alternators, can you monitor the health of each individually?

 

Oil begins to coke around 450F. After a hard pull, I bring my turbo'd engines down to 400F and shut them down. If driving around town, the turbo is usually under 400F long before I pull into my parking spot. With the advent of water cooled housings, you could probably get away with slightly higher exhaust temps, but 400F is a good round number for me.

 

I'll post a picture of it here this evening - worth a thousand words. Install couldn't be simpler. Windshield suction cup mount by the left A-pillar. Cable just gets tucked under weatherstripping and plugs into OBDII. It installs in the same plane as the dash gages (same distance from your eyes) so there isn't a third focal plane. And, the colors adjust to almost exactly the same as the dash, so it blends right in.
It'll adjust the speed to whatever you tell it the old and new diameters are. I don't know what the limit is, but I'd bet money you can adjust it for 37s. Yes, corrected speed is on Edge only. I'm used to it now - Edge says 66 mph, that's the speed I'm going (even though cruise is set to 60).
I haven't found an alternator amp view - I use battery volts. Sits very consistent 14.4 to 14.7 volts. When I have my camper on running the inverter and microwave for breakfast after draining the camper batteries over night I've seen it drop to 13.4v. ( I have 1/0 gage battery cables run to my camper to take advantage of the dual alts - no longer have to bring a generator - 350 amps at 12V is about the same as a 4kw generator, so just idle the truck). I've been happy with just the digital volt reading.

 

Here’s a pic

 

Excellent, a nice clean installation.
Thanks