Gas vs PSD
Thread Starter
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Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
Show me. I wanna see it. You want me to believe more rpms can = less fuel? No way. My 6.0 uses more fuel at more rpm. Dude when you hit a strain like wind, weight, a hill, or all of them yoy ADD fuel to maintain speed or gain speed. Say whatcha want. I love the idea though.
Lower RPMs= better fuel mileage is flawed logic once load is added to the mix.
Cargo Master
Joined: Jan 2005
Posts: 2,413
Likes: 11
What Johnny is getting at is that a V10 SuperDuty with 35s and 3.73s lugging along at 1650 RPM with a trailer at 35% throttle is using more fuel than the same truck with 4.88s turning 2100 RPM and using 20% throttle.
Lower RPMs= better fuel mileage is flawed logic once load is added to the mix.
Lower RPMs= better fuel mileage is flawed logic once load is added to the mix.
Here's the thing though. Tires and gears is like fractions. What you do to one side do to the other. I haven't done the math I'm just guessing that 35's w/ 4:88 would be like 285 with 4:11s. So you might not actually raise the rpms. These are mechanical adjustments not programming. I might have misunderstood that the tire size had changed and the rears where changed because of it. So yea now getting things back in order the rpm to mpg range might be back in place and you won't see a difference in milage. If this is the case I'm sorry I misunderstood. I took it that they where just going to gear the truck and raise the rpms and save fuel. That just doesn't happen.
So what's turning the engine those extra 500 rpms? Data packets? The enginenis turning faster it needs energy to turn faster. It takes fuel to do that.
Thread Starter
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Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
Oh so this applies only to the v10? Aight I understand. My brothers amarilo and my other friends 6.0s has 3:73s. Everthing being equal they get better milage than I do. A good 2 mpg. An advantage we've noticed is my truck does shift much thru the hills to keep speed. That mechanical. That's what gears are suppose to do. But again this is the case of a psd. Oh well.
Here's the thing though. Tires and gears is like fractions. What you do to one side do to the other. I haven't done the math I'm just guessing that 35's w/ 4:88 would be like 285 with 4:11s. So you might not actually raise the rpms. These are mechanical adjustments not programming. I might have misunderstood that the tire size had changed and the rears where changed because of it. So yea now getting things back in order the rpm to mpg range might be back in place and you won't see a difference in milage. If this is the case I'm sorry I misunderstood. I took it that they where just going to gear the truck and raise the rpms and save fuel. That just doesn't happen.
So what's turning the engine those extra 500 rpms? Data packets? The enginenis turning faster it needs energy to turn faster. It takes fuel to do that.
Here's the thing though. Tires and gears is like fractions. What you do to one side do to the other. I haven't done the math I'm just guessing that 35's w/ 4:88 would be like 285 with 4:11s. So you might not actually raise the rpms. These are mechanical adjustments not programming. I might have misunderstood that the tire size had changed and the rears where changed because of it. So yea now getting things back in order the rpm to mpg range might be back in place and you won't see a difference in milage. If this is the case I'm sorry I misunderstood. I took it that they where just going to gear the truck and raise the rpms and save fuel. That just doesn't happen.
So what's turning the engine those extra 500 rpms? Data packets? The enginenis turning faster it needs energy to turn faster. It takes fuel to do that.
The more load you add, be it wind, bigger tires or weight, the higher that best fuel mileage rpm will be with the V10. After peak torque that stops being the case.
Cargo Master
Joined: Jan 2005
Posts: 2,413
Likes: 11
Bill your getting more work done work per the extra fuel but there is still more fuel used. We are talking everthing being the same just the rpms has raised up right? Its going to take fuel to turn the crank 500 more rpms. You can't turn it with burning fuel. Now I'll agree that the percentage of work being done over that 500 rpm will be greater but your going to raise your rpm to save fuel.
Lead Driver
Joined: Nov 2007
Posts: 5,139
Likes: 209
What Johnny is getting at is that a V10 SuperDuty with 35s and 3.73s lugging along at 1650 RPM with a trailer at 35% throttle is using more fuel than the same truck with 4.88s turning 2100 RPM and using 20% throttle.
Lower RPMs= better fuel mileage is flawed logic once load is added to the mix.
Lower RPMs= better fuel mileage is flawed logic once load is added to the mix.
Cargo Master
Joined: Jan 2005
Posts: 2,413
Likes: 11
My 6.0l is the only diesel I've owned and worked. So my experence is limited to it. I pay attention to my gauges. On small hills or rises I can see my turbo boost 5-8 psi rpm hands moves just alittle. You know how the hashes are I couldn't give an exact number so I've switched to the digital read out. The rpms raise to 60-85 rpms. I keep speed and never downshift or have any lose in speed. A real good grade [I dunno grade numbers] I can see anywhere from 10-20 psi of boost 300-400 rpms and a gear shift and never have lost speed. This a mile or so climb and loaded heavy. I'm burning more fuel either way. Basicy I'm saying with my truck turbo boost can be just letting it breath or it can really help the power. This engine wouldn't be anything without it. Of course I have tje tq shift tranny and you might be talking about a manual. If that's the case any engine can fall to that. Doesn't have to be heavy trucks either. We have hills around here that I have to drop to 3rd and 2nd. 4th and 5th just won't pull em. Got to get that tq out back.
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Cargo Master
Joined: Jan 2005
Posts: 2,413
Likes: 11
But you don't run a 60w light bulb from 1 volt through 110 volts neither.
To the guy who says BS to a 50% improvement in mpgs going from 3.73s to 4.88's, that's towing heavy. And it just points out how a V10 can greatly benefit when operated in a range that suits it. But never mind, we're all lying.
To the guy who says BS to a 50% improvement in mpgs going from 3.73s to 4.88's, that's towing heavy. And it just points out how a V10 can greatly benefit when operated in a range that suits it. But never mind, we're all lying.
Its been said that the turbo is the source of the diesel engines power. I believe that but this morning on my tractor moving some hay I thought of something. My 98 jd 5300 has a 2.9l engine. Its n/a. The 03 or 04 [I dunno when they started putting turbos on the 2.9] until now has the same hp but are turboed. What is even worse 5310, 5320,5330,5340s all have different hp , same engine same frame.
Postmaster
Joined: Apr 2006
Posts: 3,524
Likes: 2
From: CA Bay Area
Industrial, electric motor can pull over 10 times rated amps on start up. That is impossible with any combustion engine.
Per my observation turbo benefit engines, but cost additional money to build and ever more to maintain. Gasoline engines builders dropped the idea of installing turbos on popular cars because of those.
Turbos are installed only on engines where hp/weight is critical like sport cars, or diesel engines that weight 900 lb for short block.
Per my observation turbo benefit engines, but cost additional money to build and ever more to maintain. Gasoline engines builders dropped the idea of installing turbos on popular cars because of those.
Turbos are installed only on engines where hp/weight is critical like sport cars, or diesel engines that weight 900 lb for short block.
Postmaster
Joined: Apr 2006
Posts: 3,524
Likes: 2
From: CA Bay Area
You are comparing turbos for 20 years old cars/trucks. New, computer controlled turbos with adjustable outer fins cost big thousands. Typical price for turbos 20 years ago was $3000. Those were years when cars cost $7000 or you could buy Yugo for the price of turbo 
Beefing up the engine components doesn't cost much if is done at design stage.
Beefing up the engine components doesn't cost much if is done at design stage.