High cylinder head temps or wrong PID?

[Walt]

Hi all, I had a great trackday here at Zolder and decided to do some logging with my Obdlink MX+.

One of the PIDs I decided to log was: Ford, Lincoln, Mercury --> Powertrain Control Module --> Cylinder Head Temperature Sensor 2

I didn't see a "1" so I assumed this was the correct one.

The temps were between 115-130C (240F - 266F) while the coolant temp never got hotter than 93C (200F). Ambient temps were 14C (57F).

These seem awfully high to me or is this normal for an Ecoboost engine? I never saw any warning on the dash and the car didn't seem to pull any power as it ran great. Oil "temp" indicator stayed in the outer green part just before yellow, but never hit the yellow zone.

I had a quick glance at the dash indicated cylinder head temp in the pits and I don't recall seeing it that high it mostly seemed the exact same as the coolant temp.
Is this just the wrong PID or is this indicating something else?

Here is the logging file (sorry temps are in C)

Sponsored

 

[16Fastback]

My cylinder head temps have never gotten higher than 190* and that was after a 142 mph run,most of the time it's 183*.
I do have a CVF Street intercooler.

 

[Walt]

My cylinder head temps have never gotten higher than 190* and that was after a 142 mph run,most of the time it's 183*.
I do have a CVF Street intercooler.

I have the same intercooler, and those temps stayed below 40C (104F). I'm hoping it is just a wrong PID value or something, there was no other Cylinder head temp choice.

It would make more sense if this was the oil temp, but those can't be logged as far as I know since it is inferred.

 

[tosha]

You need to look at the dash data at the time when load is happening, glancing at it when you're in the pits is too late.

Also, check out the thread right next to yours, there's almost 800 posts about exact same problem: https://www.mustang6g.com/forums/threads/track-time-limited-due-to-high-cht.166499/

I don't think your PID is wrong, it is very easy to get CHT into that range, but I don't have experience with ecoboosts. Unfortunately, unless you're on a mach1 or gt350/500, stock mustang cooling is only good for street or occasional highway pulls. Even PP1/2 is crap for anything beyond beginner parade lapping.

 

[GJarrett]

I'm not sure that is the actual CHT. Did you notice what the CHT was on your dash display? Mine went into a limp mode at 225F at Virginia International Raceway and I had to cruise a lap in 6th gear with the heat on to cool it down and get it out of overheat limp mode.

 

[Walt]

I'm not sure that is the actual CHT. Did you notice what the CHT was on your dash display? Mine went into a limp mode at 225F at Virginia International Raceway and I had to cruise a lap in 6th gear with the heat on to cool it down and get it out of overheat limp mode.

When you hit limp mode, did the dash notify you in any way? Or was it like really noticable in power? I didn't feel any difference in power, I was able to put consistent sub 2 min lap times down.

It's just really strange that the coolant temp and oil temp never got that hot, that's why I'm thinking the PID is wrong.

I can't really remember what was on the dash but I don't recall seeing it go above 100C (212F) I think.... seemed close to the ECT as logged.

 

[Walt]

You need to look at the dash data at the time when load is happening, glancing at it when you're in the pits is too late.

Also, check out the thread right next to yours, there's almost 800 posts about exact same problem: https://www.mustang6g.com/forums/threads/track-time-limited-due-to-high-cht.166499/

I don't think your PID is wrong, it is very easy to get CHT into that range, but I don't have experience with ecoboosts. Unfortunately, unless you're on a mach1 or gt350/500, stock mustang cooling is only good for street or occasional highway pulls. Even PP1/2 is crap for anything beyond beginner parade lapping.

It's just really strange that the coolant temp and oil temp never got that hot, I would've thought that the ECT would also be much higher. IF those were the actual CHT temps would there be engine damage or anything I should worry about?

 

[tosha]

It's just really strange that the coolant temp and oil temp never got that hot, I would've thought that the ECT would also be much higher. IF those were the actual CHT temps would there be engine damage or anything I should worry about?

ECT and oil temp are calculated values, at least on 5.0. there are no physical sensors in the engine - another idiotic idea on "the most popular sports car in the world".

I mean, you haven't melted your engine by doing it once, but it's definitely pushing it to a failure, if you keep doing it. I start a cooldown lap whenever I see anything above 235F. It might still be the case that your PID was off, but since you were not monitoring CHT while on track, you won't know for sure unless you do another track day. Shifting 500rpm earlier is generally a good strategy to keep it in a more happy range.

 

[GJarrett]

When you hit limp mode, did the dash notify you in any way? Or was it like really noticable in power? I didn't feel any difference in power, I was able to put consistent sub 2 min lap times down.

It's just really strange that the coolant temp and oil temp never got that hot, that's why I'm thinking the PID is wrong.

I can't really remember what was on the dash but I don't recall seeing it go above 100C (212F) I think.... seemed close to the ECT as logged.

No dash notification, it just lost a ton of power.

 

[HeelToeHero]

Couldn't you just go on a drive on the street and compare the relationship between the dash value and obdlink value. If there is a disconnect I'd think you'd see it even at cooler street temps.

 

[Flattop]

CHT2 (the only one the eco has) is on the exhaust side of the head. I have logged that and compared to the dash gauge, and noted a consistent 30 degree difference between the PID and gauge. I suspect Ford did that on purpose to get more of an average temp across the head, and/or so they don't display a scary high number.

 

[Walt]

CHT2 (the only one the eco has) is on the exhaust side of the head. I have logged that and compared to the dash gauge, and noted a consistent 30 degree difference between the PID and gauge. I suspect Ford did that on purpose to get more of an average temp across the head, and/or so they don't display a scary high number.

So if you see a CHT2 of 270F the actual CHT is 240F and at that point you should back down?

Sponsored