Stupid ? why the big swing in PSD mpg and not V10 mpg

[captchas]

Originally Posted by mjanulaitis

The stock programming for both the 7.3 and 6.0 PSD is absolutely awful. You really have to put some money into your airflow and fuel flow. Once you do that, the difference is night and day.

I find it interesting the moderator would say PSD owners are less informed. I think it depends who you are talking to. I can see that if the PSD owner is buying the smelly fuel for mileage. 4K engine price upgrade and anther 2K in modifications, 15 quarts of oil, 1K more lbs. on the front axles, AND fuel that runs (at least here in Utah) about 10 to 30 cents more than premium probably isn't thinking clearly. I'm imagining most of you'all in this forum live in the flats. My V10 RV I just bought does great on flats. I was quite surprised at the low end take off speed. I almost ripped the surge brake actuator off my trailer several times. As soon as I hit a grade...it's all over . Out here in Utah we all have diesels. It's very rare to see a V10 and when you do...it's in the slow lane with the big rigs (maybe the middle lane...but never the left one). The PSDs can pretty much all run the longest steepest grades towing a 5-10K trailer in the fast lane passing every type of regular gasser car you can imagine. When you live in an area where you are either going up a grade or down a grade and there are virtually no flats...that's very important...hence the reason we all spend about 6K more out the door.

After this weekend, I could definitely see how buying a PSD in flat land America is a waste of money. So in that sense I agree with you’all.

may i ask if that rv has a two or 3 valve motor? as the 3valve is a very strong pulling rig. i and many others regularlypull out with 22k total and have no problem pulling big grades . and i pull a very day thats 25% never had a problem. the hill is only 1.5 miles but it's a dead start at the bottom pull as there is a stop sign at the bottom it's one of two ways home the other way is 19% for 3 miles . yes it's a ski area mountain that i live on the top of .

[MountainHound]

Originally Posted by mjanulaitis

It's very rare to see a V10 and when you do...it's in the slow lane with the big rigs (maybe the middle lane...but never the left one). The PSDs can pretty much all run the longest steepest grades towing a 5-10K trailer in the fast lane

I've done a few thousand miles towing in the 7500lb range with my V10 and it doesn't have any trouble getting up to and holding at 75mph on any highway grade(speed limit is 70 so that'd be "in the fast lane") around here. Don't normally go that fast towng but it has power to go faster if I'm stupid enough to. I live it WV. Not exactly a flat state-lots of steep grades albeit not as long/high as the ones out west.

I don't drive 75 often but I can tell you towing up to 8000lbs I don't spend time in the slow lane with the big rigs, as you say and mine's a 2003 with a 3.73 axle. I don't believe ay V10 SD that's running and being driven right is going to perform as miserably on any highway hills as you're claiming.

Geez. I've pulled a 7000lb enclosed ute trailer up a highway hill at 75mph with my wife's F150 5.4L and still had plenty of power to speed up. Like I need to.

[captchas]

yah! some people can't seem to think back in time. to when NO PICKUP had the option of the stronger diesel motors and had only what many now think of as wimpie gas motors. but they still got the work done. and that was what a pick up is all about, doing work and hauling and making life easier. "well i should not say small gas see end"

so mr pro psd - gas downer . please take a look back in history and be thank full.that we live in this time period and we all have the option now. that of driving what each prefers for the power under the bonnet. gas or diesel. we still drive the best brand and largest selling brand made FORD!

I for one am old enough like many others in this site, to have seen a lot, and done by, the way of how things used to be done with gas motors. seen the up swing to diesel power. built and raced motors from a low power 60 hp v8 flathead to sceaming monster big blocks.

i've driven motors maybe you never heard off, built by mack, ih, cat, detroit, cummins, gmc, izziu, heno, even drove a semi, powered by o my g-d a gas motor! yes a super big cubic inch gas motor powered semi rig . one made by gmc. that many of us old timers even have forgoten about. a motor that in smaller sizes powered early trucks back in the 60's . maybe one few even knew about. all in the gmc trucks. care to drive a pick up powered by a 305 inch v6, or a a semi with 478 cubic V6? or the 637 inch v8 or even the v12 twin 6 702 inch motor. don't believe me that those motor exsisted here www.6066gmcguy.org click on the top "engines" and veiw what gas motors used to do. one needs to understand it's not the fuel doing the work in a gas motor it's the cubic inches,torque and gearing .

sorry but todays world is one, of 2 every day fuels right now, that every one knows about and we all know both work. plus they can, have and will continue to make our lifes easier. thats what counts in my mind .

[desrcr]

Originally Posted by mjanulaitis

The stock programming for both the 7.3 and 6.0 PSD is absolutely awful. You really have to put some money into your airflow and fuel flow. Once you do that, the difference is night and day.

I find it interesting the moderator would say PSD owners are less informed. I think it depends who you are talking to. I can see that if the PSD owner is buying the smelly fuel for mileage. 4K engine price upgrade and anther 2K in modifications, 15 quarts of oil, 1K more lbs. on the front axles, AND fuel that runs (at least here in Utah) about 10 to 30 cents more than premium probably isn't thinking clearly. I'm imagining most of you'all in this forum live in the flats. My V10 RV I just bought does great on flats. I was quite surprised at the low end take off speed. I almost ripped the surge brake actuator off my trailer several times. As soon as I hit a grade...it's all over . Out here in Utah we all have diesels. It's very rare to see a V10 and when you do...it's in the slow lane with the big rigs (maybe the middle lane...but never the left one). The PSDs can pretty much all run the longest steepest grades towing a 5-10K trailer in the fast lane passing every type of regular gasser car you can imagine. When you live in an area where you are either going up a grade or down a grade and there are virtually no flats...that's very important...hence the reason we all spend about 6K more out the door.

After this weekend, I could definitely see how buying a PSD in flat land America is a waste of money. So in that sense I agree with you’all.

Some of my deisel owning freinds can't beleive the rpm I carry up hills. They are used to lower rpms, these V10's will pull but, not at the lower rpms you are used to.
Spin that RV up to 4k and it will pull just fine.

[mjanulaitis]

MountainHound what altitude are your passes at? Mine are between 6500 and 8500.

desrcr I'm swapping the 4.10 gear for a 4.56 gear in the rear end next week. Hopefully that will help out get the RPMs up.

[KubotaOrange76]

i think you will be very pleased with the desicion. heck most of the 450's ive seen have 4.88 gears....might even consider going that low

[mgraveman]

One this I have noticed as a diesel owner is that diesels are very sensitive to RPM. On both my IDI and my Duramax, mileage drops off considerably at 2000 RPM's. Therefore, driving style and rear end gears are a very large factor in what the mileage is. Also, diesels don't have to fight a throttle plate for induction. They get better economy at low RPM's and at idle than gassers, in general. For this reason (and because they can be harder to start), people tend to leave them running more often when running errands. This can really lower mileage, because an idling Diesel uses more fuel than a shut off v10.

On my IDI, the 2000 RPM cutoff is at 53 mph with a dually and 4.10 gears. I get 15-16 on the highway at 70 mph, which is about 2700 rpm's. I get about 14-15 combined very regularly, unless I'm towing heavy. I have heard reports well over 20 mpg from other IDI owners with 3.55 gears and a little less truck to push around. I have no doubt that this is very easily truth, as mine isn't too far off that, and I'm hard on it.

My duramax is still pretty new, and I'm a bit disappointed with it. Mileage is a little better than the IDI, but it has a lot more advantages, like 3.73 gears and a six speed allison. 2000 RPM's come at about 75 on that one, again with a dually.

I also have had (and have) a gas dually. I really can't tell any mileage difference between 55 and 70 mph. It's not very noticeable at least.

Since it was brought up, I have heard that a larger diesel will usually get better economy than a smaller one in a given application. I assume this is because it's staying at lower RPM's more often, and not being worked as hard.

I'm not trying to start a fight, I just had a few things to say that I hadn't seen addressed yet.