Towing Tune Question

[Dfishrmn]

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.

[Jackpine]

Originally Posted by Dfishrmn

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.

Using 2000# as a "breakpoint", as Bill suggests, you could leave the tune alone. The 1500-1800# in the bed is going to be harder on your suspension than it is on the engine or transmission, so I'd try to keep the speed down with that much weight aboard. In fact, I think that much weight is a bit over the GVW or axle rating for your truck. When towing, you only add the tongue weight (usually 300-500#) to the GVW and axle loads.

- Jack

[Power Hungry]

1800 pounds in the bed is pretty steep for an F150. I wouldn't really be worried about how well the engine would handle it, but more how the axles would handle it. That rough!

In case, the weight limit is how much you're pulling. Whether in the bed or behind it is of little consequence. You should be fine in the 87 program.