2.7 payload +trailer tow vs 3.5 HD payload+max payload.
09-10-2018, 06:50 AM
#22
Senior Member
Plenty of discussion on the forum about how that video is not useful.
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chimmike (12-16-2018)
09-10-2018, 10:26 AM
#23
Everyone is overlooking the fact that a 2.7 being pushed hard enough to pull the weight a 3.5 is rated to pull, would generate a tremendous amount of heat. Heck 3.5TTs overheat at max load under certain conditions from posts seen here. Push a 2.7 to do that and turbo induced heat would be off the chart.
09-10-2018, 01:47 PM
#24
Its not the same 9.75" axle in the HDPP i dont think. If you look in the spec guides, the HDPP axle actually takes more fluid than the normal 9.75. The HDPP trucks also generally have thicker frame rails than the non-HD trucks.
You also need to consider things like cooling, brakes, etc when considering towing. The 2.7 clearly has the power to tow 10 or 11k lbs but ford may not be outfitting it with the biggest cooling systems that the 3.5 gets. I think they should, if I knew I could legally tow 10-11k lbs then I would likely never consider the 3.5 but unfortunately ford has positioned the 2.7 as a mid range motor.
Springs are determined by axle weight ratings. a 3500 lb RAWR will get one set of springs and the 3800 will get another but I dont think the engine choice matters. An HDPP truck will most certainly have a higher spring rate than ANY other F150. They have a 4800 lb RAWR. I know that even with the payload package, the 2.7 doesnt have the same GVWR as the normal(non-HDPP) 3.5 trucks so its possible the springs are also lighter if the AWRS are lower too.
You also need to consider things like cooling, brakes, etc when considering towing. The 2.7 clearly has the power to tow 10 or 11k lbs but ford may not be outfitting it with the biggest cooling systems that the 3.5 gets. I think they should, if I knew I could legally tow 10-11k lbs then I would likely never consider the 3.5 but unfortunately ford has positioned the 2.7 as a mid range motor.
Springs are determined by axle weight ratings. a 3500 lb RAWR will get one set of springs and the 3800 will get another but I dont think the engine choice matters. An HDPP truck will most certainly have a higher spring rate than ANY other F150. They have a 4800 lb RAWR. I know that even with the payload package, the 2.7 doesnt have the same GVWR as the normal(non-HDPP) 3.5 trucks so its possible the springs are also lighter if the AWRS are lower too.
09-10-2018, 02:18 PM
#25
My take was the techs can just see though the marketing hype. If II was going to get a newer F150 to replace our 2010 5.4 with 210,000 miles l would lean on the 5.0 side
10-20-2018, 09:47 AM
#26
Grumpy Old Man
GCWR (and tow rating) are primarily a functions of engine power and torque. The 3.5L has a lot more power and torque than the 2.7L. The difference in GCWR is 3,700 pounds. The difference in your example tow ratings is 3,500. There really is that much difference in the towing capability of those two engines.
My 2012 with the 3.5L EcoBoost engine constantly amazes me when towing heavy. But it's getting long in the tooth, so I ordered a new 2019 with the same engine.
10-23-2018, 01:15 PM
#27
Tow rating is GCWR minus the weight of the truck. The GCWR of the 2.7L with tow rating of 8500 is 13,300, but the GCWR of the 3.5L with tow rating of 12,000 is 17,000. Remember that the GCWR and tow rating of new F-150s are certified by SAE as being reasonably accurate.
GCWR (and tow rating) are primarily a functions of engine power and torque. The 3.5L has a lot more power and torque than the 2.7L. The difference in GCWR is 3,700 pounds. The difference in your example tow ratings is 3,500. There really is that much difference in the towing capability of those two engines.
My 2012 with the 3.5L EcoBoost engine constantly amazes me when towing heavy. But it's getting long in the tooth, so I ordered a new 2019 with the same engine.
GCWR (and tow rating) are primarily a functions of engine power and torque. The 3.5L has a lot more power and torque than the 2.7L. The difference in GCWR is 3,700 pounds. The difference in your example tow ratings is 3,500. There really is that much difference in the towing capability of those two engines.
My 2012 with the 3.5L EcoBoost engine constantly amazes me when towing heavy. But it's getting long in the tooth, so I ordered a new 2019 with the same engine.
10-25-2018, 01:25 PM
#28
Grumpy Old Man
12-16-2018, 06:10 AM
#29
Everyone is overlooking the fact that a 2.7 being pushed hard enough to pull the weight a 3.5 is rated to pull, would generate a tremendous amount of heat. Heck 3.5TTs overheat at max load under certain conditions from posts seen here. Push a 2.7 to do that and turbo induced heat would be off the chart.
12-17-2018, 09:54 AM
#30
So true on overheating. I have overheated the 3.5 towing up the IKE, and towing up a 6% in Utah (granted it was triple digit temps). In my case, lesson learned to lock out 5th and 6th when towing with 3.15 gearing. It pulled great in 5th up the IKE maintaining the speed limit, but the heat coming off the turbos and the torque converter since it was unlocked caused it to get really hot. Same thing in Utah, both times It just pulled and I didn't even give it any thought about the heat until the warning came on.
With great power comes great heat.
With great power comes great heat.
