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.