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5.0 3.55 rpms

 
Old 03-05-2019, 11:37 AM
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It is doing less damage running in 4th gear at 3000 rpm's than trying to run it in 6th gear at 2200 rpm
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Old 03-05-2019, 01:05 PM
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Originally Posted by Jeff1024 View Post
Naw - the 5.0 is made to rev - thats how it makes power. 2,900 is nothing.
Originally Posted by marshallr View Post
It is doing less damage running in 4th gear at 3000 rpm's than trying to run it in 6th gear at 2200 rpm
Agreed.

A standard V6 or V8 without turbos or superchargers is made for spinning up to create peak power. In general, they are oversquare engines as opposed to undersquare engines. The oversquare makes for a bigger bore, shorter stroke, requires lower compression, the pistons move slower and the internals are usually lighter weight. Diesels and turbo gas engines are opposite of that. Their internals move faster, are heavier but require less RPM to create peak power. Which one is better...Both.

Having towed the same 7500lbs trailer with both the 3.5L Ecoboost and 6.2L, they were both good towing engines. The trucks were not apples to apples as the F150 had the 3.55 (reduced to 3.43 with 33" tires) rear end and the F250 has the 3.73 and the 6 speed transmissions were geared slightly different.

My observations:
6.2L - Keep it spinning in the 3k+ range and it's happy. Anticipate hills or long grades by downshifting and there's always plenty of power to keep at speed.
3.5L - Let it do it's thing in tow/haul mode and the turbos will spool. It will hold a gear (5th & 6th) for a long time before it needs to downshift; however, when it does downshift to keep speed on a grade, it will wind up to 3500 as well. My concern was always how much pressure that small engine was under to maintain moving 14000 pounds of truck and trailer.

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Old 03-05-2019, 03:10 PM
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Stop locking out 5th and 6th, put it in tow/haul and let it do it's thing. If it needs to downshift and rev, it will. If it can maintain speed in 5th or 6th, it will. The advice to lock out overdrive is a carryover from when trucks made 220hp and could not maintain highway speeds in overdrive.

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Old 03-05-2019, 09:58 PM
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Agree with 11screw50.
i went from an 08 6.4 F250 to a 17 F150 5.0. Revs up alot, but if you anticipate the road, all is good. (towing about 8k.)
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Old 03-05-2019, 11:15 PM
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Yep the 5.0 loves to rev, let her spin. The 5.4L Triton by contrast is undersquare (more stroke than bore) and reaches peak torque at 3,500 rpm (365 ft lbs). Even with the same 6R80 trans two different animals. The 5.4L has more pull in the 2,000-3,000 rpm range and can chug along at lower rpm. Let the 5.0 rev a little and it will pull good as itís oversquare (more bore than stroke). Once you are up to speed and flat grade they will upshift and stay in lower RPMs anyway regardless of engine.

This is why the 5.4 & 6.8 Tritons are touted for their towing ability, itís the long stroke and lower peak torque (thus less rpm). They however lack in top end power and peak fun as a trade off, something the 5.0 excels at.

Last edited by ModularFord; 03-05-2019 at 11:34 PM.
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Old 03-06-2019, 01:06 AM
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Originally Posted by ModularFord View Post
....This is why the 5.4 & 6.8 Tritons are touted for their towing ability, itís the long stroke and lower peak torque (thus less rpm). They however lack in top end power and peak fun as a trade off, something the 5.0 excels at.
I always forget about those '09 & '10 model years. Those 5.4's mated to the 6r80 were good towing machines.
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Old 03-06-2019, 01:43 PM
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Originally Posted by clarkbre View Post
I always forget about those '09 & '10 model years. Those 5.4's mated to the 6r80 were good towing machines.
Indeed they are, they used the 5.4/6R setup in the Expeditions from 07-14í they make a good pair. Wish the F-150 had more years with that setup like the expy, good combo for towing.
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Old 03-06-2019, 04:20 PM
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Originally Posted by marshallr View Post
It is doing less damage running in 4th gear at 3000 rpm's than trying to run it in 6th gear at 2200 rpm
If the truck stays in 6th at 2200RPMs what damage are you referring too?

When I tow I don't lock out any gears, if the truck is able to get into a higher gear I let it do its thing. If it cant get into a higher gear then well its going to stay in a lower gear so put tow haul on and let it do its thing. Now if you have plenty hills or what not and you cant maintain speed then lock them out, if not just roll with it.

Wayne

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Old 03-06-2019, 07:09 PM
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Transmissions that keep hunting for the right gear are not happy transmissions. Constant shifting will contribute to overheating.
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Old 03-14-2019, 10:38 PM
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Originally Posted by 11screw50 View Post
Stop locking out 5th and 6th, put it in tow/haul and let it do it's thing. If it needs to downshift and rev, it will. If it can maintain speed in 5th or 6th, it will. The advice to lock out overdrive is a carryover from when trucks made 220hp and could not maintain highway speeds in overdrive.
So agree with this. Ran my forest river bunkhouse 29 ft travel trailer weighing in at about 7500 pounds loaded with my 2011 5.0 screw 3.55 gears. Never locked out any gears. Running at Hwy speeds around 65 mph rpms were around 1900/2200. Rarely did my truck ever shift into 6th unless going down hill or very flat land. Run in tow haul typically unless ground is pretty flat.
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