EcoBoost upgrade question.

[commanderfluffy]

Wow that was very detailed and a great read! Thank you for the information. Kinda understand a bit more about the car now.

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[neodark]

[MENTION=25093]TheLion[/MENTION] Where did this 150F CAT temp come from? What I read before was that anything over 100F would cause the ECU to pull timing.

by the way, nice post!

 

[TheLion]

[MENTION=25093]TheLion[/MENTION] Where did this 150F CAT temp come from? What I read before was that anything over 100F would cause the ECU to pull timing.

by the way, nice post!

150F if I recall came from one of the tuner's who noted the PCM response to high intake temps.

Now it would be entirely feasible that the timing is going to adjust as the temperature and load vary. We know there's advance and retardation of the timing even under normal operating conditions (aka the air temp is in the low 100's). However it is my understanding that the "safe guards" kick in around 150F where the timing is retarded as far as it can be and throttle is also pulled to prevent knock.

There's a difference between normal expected operating parameters and "oh crap we better do something radical or it's gonna blow" safeguards...make sense?

The tuner may have been wrong, I'm not sure, but there are a few sources stating 150F is when we start hitting PCM safeguards to prevent knock. If you think about what a NA engine sees, 150F is very hot comparatively. I've watched the IAT on my old 07 Focust ST (NA Duratec 23) and it's usually within 15~20 degrees of ambient even when idling in traffic on pavement (high 80's, low 90s ambient). Combine air temps near boiling (185F after just 2 gears!) point and high compression and you have a volatile mix can ignite from the internal chamber temps alone even without spark (hence why we get detonation just before or during top dead center and hence knock).

Here's the StangTV article which mentions it (I've seen it circulated by other tuners as well, but this is where I first saw it): http://www.stangtv.com/tech-stories/power-adders/vortech-cools-the-boost-on-our-2015-mustang-ecoboost-project-car/

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