16 f150 3.5 Low timing / poor mileage towing

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07-27-2019
Cali

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16 f150 3.5 Low timing / poor mileage towing

Hey everyone ,
I was pulling my travel trailer ( 6500 lbs ) and was seeing absolutely abysmal mileage. I quickly got a cruise log and seen my timing was super low . Its not a great log , as I didnt have time to set the parameters. The only thing I can see that would cause this is ECT timing .. as I was running warm ( 230 C ) and the ECT table shows -50 deg fro 250 C ... So my question is... does anyone ever modify the ECT Table so its not so aggressive?? I tow with 91 oct.
Attached is the crappy log and the tune I am currently using. Attachment 91901 Attachment 91902
07-30-2019
rpturbo

I have not touched a ford in years. I can say that on a turbo motor, you do have to be very careful with timing. Timing causing detonation will destroy that engine quick, really quick towing. On the other hand, the higher timing will spool the turbos differently. Sometimes less is more on a turbo motor, because it moves the energy further into the exhaust, which in your case, is closer to the turbo. I would keep a open mind, and start slowly changing and logging and seeing where things go. BTW, what defines poor mileage? Just curious, is that 10mpg? I would think that would qualify as abysmal to me, but then I don't pull a 6500# trailer. What was the terrain you were pulling in?
07-31-2019
LastPlace

The best tow tunes for an ecoboost keep boost and timing low and hold gears/ use rpm vs using the turbos.
08-06-2019
dsltech83

Speed has a lot to due with ecoboost towing numbers. The 2013 that I had got 7 mpg at 70 interstate and 10-12 at 55 mph towing locally with my 5500 lb tt. If you tow fast you are on COT fueling all the time.
08-06-2019
HackAbuse

Quote:

Originally Posted by dsltech83

Speed has a lot to due with ecoboost towing numbers. The 2013 that I had got 7 mpg at 70 interstate and 10-12 at 55 mph towing locally with my 5500 lb tt. If you tow fast you are on COT fueling all the time.

Agreed. Adjust your shift points so that you stay in a lower gear (higher rpm, less boost)

Looking at your log, you're constantly pretty deep into boost and the PCM is using fuel enrichment to keep things cool