tpagolfnut
Member
I have just been using tow/haul drive mode but was wondering if when driving in the mountains I should also use manual transmission mode. What combination do you use? New to expeditions and not sure.
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I don't bother to lock out the top gears. Taking my foot off the accelerator, as in when starting down a hill, automatically causes it to downshift.Tow haul should work fine, but lock out the top gears.
Locking out the top gears reduces boost. Helps reduce issues with the engine running too hot by increasing RPM and using the gears instead of boost. I think too much towing in top gear warped my manifold.I don't bother to lock out the top gears. Taking my foot off the accelerator, as in when starting down a hill, automatically causes it to downshift.
Not entirely correct. Run the engine at 4k going downhill and see how much manifold pressure the engine is generating. The answer is probably close to zero because it doesn't need any to maintain speed going downhill. RPM and boost aren't fixed like RPM and speed in a specific gear. When you use a lower gear, the engine actually sees less load, so it doesn't drive the turbos as hard despite operating at higher RPM. If you hook up an OBD monitor you can see the relationship. The turbos actually generate less manifold pressure in lower gears to maintain highway speeds.Umm boost is tied to rpm. Locking out gears would increase rpm vs up shift.
Locking out gears keeps drivers from driving to fast
It's been covered ad nauseum on the F150 forums. Comes up frequently for years now.First time I've heard of this. Any more I can read on this?
-- Chuck