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RE: just a little more power
Not anymore. Most HD pickup trucks only have one gear option these days.
Not for gas trucks. Dodge offers 2 options, Ford offers 3. Gm is the only one that does not have an option. They haven't for a while iirc.
There are only 3 major manufactures of consumer HD trucks, and 2 of those offer different gear options, with increased tow ratings for deeper gears, for the gas trucks.
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parker.rowe
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07/13/22 12:25pm |
Tow Vehicles
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RE: just a little more power
I'm not sure why people think the rear gear ratio only changes rpm/mph.
It increases torque multiplication to the rear wheels. It will tow more easily in all gears. It may allow towing one gear higher than usual
If the truck is in fact a 3.73 truck, it will make a difference going to 4.30's. Ford didn't offer that option for fun.
Yes, it will increase cruise RPM in 6th by 2-300 rpm. Might loose 1mpg unloaded. But as Fish stated you may gain mpg towing.
You know WHY it "tow more easily in all gears?"
Because the engine is running at a higher RPM at all speeds!
The engine produces more HP at higher RPMs, up to the peak of the power curve.
People think "gear ratio only changes rpm/mph" because that is precisely what it does.
If you were doing 60MPH at 2000RPM with stock 3.73 gears, you will need to rev the engine to 2305RPM to maintain 60MPH with 4.30 gears, or you will only be doing 52MPH at 2000RPM.
You still have torque multiplication happening.
For easy math, lets say you have an engine with a nice flat torque curve.
100ft lbs at both 2000 and 2300rpm.
Running in direct (1:1), also to make the math easier.
100ft lbs x 1 x 3.73 = 373 ft lbs
100 ft lbs x 1 x 4.30 = 430 ft lbs
The main benefit is not that it puts you at a different rpm closer to the torque peak...it is that you increase the torque multiplication in every gear.
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parker.rowe
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07/12/22 03:16pm |
Tow Vehicles
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RE: just a little more power
I'm not sure why people think the rear gear ratio only changes rpm/mph.
It increases torque multiplication to the rear wheels. It will tow more easily in all gears. It may allow towing one gear higher than usual
If the truck is in fact a 3.73 truck, it will make a difference going to 4.30's. Ford didn't offer that option for fun.
Yes, it will increase cruise RPM in 6th by 2-300 rpm. Might loose 1mpg unloaded. But as Fish stated you may gain mpg towing.
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parker.rowe
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07/12/22 08:57am |
Tow Vehicles
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RE: F150 Lightning Road Trip & Ike Gauntlet Pull
Well this certainly descended into a pissing match of total silliness lol. Thanks for the laughs.
Right?
It towed the trailer very well.
Are there range issues. Yes
Is anyone surprised by that. No
Can you make it work if you change your driving habits. Probably
Does it have impressive power and is unaffected by elevation. Yes
No one is surprised by that either.
It did a great job towing the IKE and didn't break down on the road trip. But it's not for everyone.
No big surprise there. ICE vehicles will be around for a while yet for heavy work.
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parker.rowe
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06/17/22 08:18am |
Tow Vehicles
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RE: Travel Trailer Towing Recommendations
OP did say "seat as many grandchildren as possible"...not that he NEEDED to fit all 10 kids all the time.
Also, they haven't chimed in since page 2. :)
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parker.rowe
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05/25/22 08:17am |
Tow Vehicles
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RE: Hemi to be replaced by inline six?
If anybody want's to learn why, this is a great video to learn from. If you just want to know about torque, start at the 3 minute mark and learn about long and short stroke and what it "doesn't do to engines."
Don't like videos? Fine. Lets talk about actual diesel engines.
Engine #1. 2006 LBZ 6.6 Duramax. (Why this engine?) Because I own it and know about it.
Engine #2. 2006 Ram Cummins 5.9.
Engine #1 according to the internet the Durmax has a bore of 4.055 and a stroke of 3.90. (almost a square engine)
Engine #2 according to the internet the Cummins has a bore of 4.02 and a stroke of 4.72.
According to a lot of people on here the Cummins should kill my engine in torque because of the long rod.
Here are the dyno numbers:
2006 Duramax puts out 650 ft/lbs of torque.
2006 Cummins puts out 610 ft/lbs of torque.
So much for the long stroke putting out more torque.
I can hear the fan bois all ready saying that's not fair!! Your Dirty Max is a waaaaaay bigger engine!!! Fine, more facts:
2008 Duramax 6.6 L vs 2008 6.7 Cummins:
2008 Duramax 6.6 L = 650 ft/lbs of torque.
2008 Cummins 6.7 L = 650 ft/lbs of torque.
Well would you look at that? Same exact torque even though the Cummins has a waaaay longer stroke. :B
Engine Masters did a TV show a few months back about rod length. Everybody on the show (me too) thought the long rod engine was going to put out more torque. WRONG!! They were the same within dyno measurements. Link to Engine Masters rod article.
A few things...your example engines are all turbocharged. That throws everything out the window since the boost levels and other tuning parameters can easily change the power levels.
And longer rods to not always mean longer stroke, as in that engine masters comparison.
However, I do believe that in naturally aspirated engines, displacement is what increases torque in an apples to apples comparison. It just so happens that usually the easiest way for a manufacture to add displacement is to increase the stroke.
If you have two engines that are an I6 and a v8, with the same displacement, the I6 will not inherently make more torque or be a "stump puller" just due to its inline architecture.
Engines are air pumps. The only ways to pump more air is to increase flow efficiency, increase size, or increase air density (boost or elevation changes for example).
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parker.rowe
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03/29/22 08:59am |
Tow Vehicles
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