Quote:
Originally Posted by Power Hungry
Jack, you're doing fine. 
Where we run into a problem with heavy towing (2500+) on a performance tune has more to do with cylinder temps being slightly higher because of the slight modifications to the fuel curve. I wouldn't necessarily say it does any "damage" to pull in a performance program, it's just not the ideal situation.
High performance applications are leaned out slightly to achieve good top-end power. Tow tunes run a little richer for improved low-RPM torque and lower cylinder temps under sustained heavy loads.
Of course, there are shift changes and timing changes but that has a lot less to do with it than you'd think.
Anyway, as you've already guessed, 2000 to 2500 lbs is about the limit for a performance program before I'd switch to towing.
Hope that clears it up a little.  |
Does this pertain to loads in the bed of the truck? I infrequently load the truck 1500-1800# for short trips (25-50 mi) Is this safe in the 87 Performance tune or should I switch to Tow.
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2005 F150 XLT SuperCab 5.4L V8 4x4, 3.73 LS Rear end, Auto Spring 2" Leveling Kit, Gryphon tuner custom 87 Performance tune, AEM Panel Air filter with modified stock intake, 14" Magnaflow muffler
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