Gas vs PSD
Thread Starter
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Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
Never knew that with that set up you could hear it like that, but it makes since.
Posting Guru
Joined: Dec 2006
Posts: 2,498
Likes: 3
From: Windsor, Colorado
I hear ya on the 7.3. They are harder and harder to find with out a ton of miles on. The only reason I was able to afford mine is it has a prior salvage title. Got it w/80k miles for about what ones with 200k+ were going for, and it had been wrecked at 30k miles so it isn't like it came right out of the body shop.
you guys have yourself a nice evening! I have to get to bed!!
Post Fiend
Joined: Mar 2006
Posts: 7,841
Likes: 0
From: Vacaville, Ca
That's funny right there!!
I hear ya on the 7.3. They are harder and harder to find with out a ton of miles on. The only reason I was able to afford mine is it has a prior salvage title. Got it w/80k miles for about what ones with 200k+ were going for, and it had been wrecked at 30k miles so it isn't like it came right out of the body shop.
you guys have yourself a nice evening! I have to get to bed!!
I hear ya on the 7.3. They are harder and harder to find with out a ton of miles on. The only reason I was able to afford mine is it has a prior salvage title. Got it w/80k miles for about what ones with 200k+ were going for, and it had been wrecked at 30k miles so it isn't like it came right out of the body shop.
you guys have yourself a nice evening! I have to get to bed!!
Thread Starter
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Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
I need to look up the gearing on both tranys, but i can do that tomorrow.
I have to sleep!
Super Moderator
Joined: Aug 2003
Posts: 25,479
Likes: 742
From: Isanti, MN
How can you run a gear lower than me? You have a lower rear gear already. We will probably be in the same gear at 2500 rpm. You will only have so much power even after the math because you have less torque. Once you shift to the next gear guess what, you have lost that HP advantage and you are working to get back up to again.
You can NOT have more torque at the same RPM without more horsepower!
Say Bill's near his peak at 2500 RPM and is putting out probably around 400 lb-ft. Your PSD is between it's torque peak and HP peak, so it's likely pushing around 450 or 500.
HP = (TQ x RPM)/5252
In this example, assuming my guesses are right, your PSD is pushing 214 HP(with 450 ft-lbs) and his V10 is pushing only 190.
Of course you're pulling harder, you have more HORSEPOWER!
You can never have more torque at the same RPM without having more horsepower. EVER!
Rant over, carry on!
Senior User
Joined: May 2004
Posts: 407
Likes: 0
From: Humble, Texas
Hey Bill,
I think the flaw in your math is that you are comparing new trucks. At 17, you would have been 11 the last time a new 7.3 psd sat on a lot. In order to make it a more accurate analysis, you need to determine what a 7.3 would have cost you when you bought your V10. I doubt it would have been anywhere near $6,000. In addition to that, the 7.3 will always be more valuable. Therefore, you can recoup some of the cost when you sell. You may drive it til the doors fall off but there will always be someone that will be willing to buy it.
I think the flaw in your math is that you are comparing new trucks. At 17, you would have been 11 the last time a new 7.3 psd sat on a lot. In order to make it a more accurate analysis, you need to determine what a 7.3 would have cost you when you bought your V10. I doubt it would have been anywhere near $6,000. In addition to that, the 7.3 will always be more valuable. Therefore, you can recoup some of the cost when you sell. You may drive it til the doors fall off but there will always be someone that will be willing to buy it.
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"Mifflin Clay"
Joined: Jul 2005
Posts: 3,177
Likes: 4
From: Mifflin, PA
I see nothing wrong with taking both engines and putting them in the identically set up vehicle. Kinda like taking a 500 pound pile of bricks, and timing both a slim and fast guy move them 50 feet, or a slower, stronger guy. My money would be on the slower, but stronger guy to finish first- he can carry more and won't get tired as fast.
Or perhaps the identical vehicles should have 4.88 rears and go for a speed trial.......?? Is that fair?
Senior User
Joined: May 2004
Posts: 407
Likes: 0
From: Humble, Texas
And I'll bet you would insist on putting 400 lbs of lead around the V10 to make up for the weight difference between the engines too.....what part of "different designs" didn't you see?
Or perhaps the identical vehicles should have 4.88 rears and go for a speed trial.......?? Is that fair?
Or perhaps the identical vehicles should have 4.88 rears and go for a speed trial.......?? Is that fair?
I'll do a speed trial with 4.88's. I already know that the V10 would have a higher top speed. I also know that the psd will get to its top speed much faster and that the psd top speed will still be faster than I would ever operate it. You want 5.38's? I'd do that too. It would be fair and the results would be interesting.
Posting Guru
Joined: Aug 2009
Posts: 2,165
Likes: 0
From: Union Lake MI
It is not how dirty it is The diesel has no gas in it to break it down. That doubles the miles for a Diesel. The V10 has some blow by hence breaks the oil down quickly. Just try to add a pint of gas to a fresh oil change & see how long the viscosity will last.
The V10 needs every 4K The 7.3 needs it 8K
Unless you tow @90 mph + Change it once a month, & the filter every other month. As for spark plugs have you hit 100K & changed them yet?
Postmaster
Joined: Apr 2008
Posts: 4,724
Likes: 4
From: Rogersville, TN
V10 164,000 miles at 10mpg at $2.40 = $39,360
7.3 164,000 miles at 14mpg at $2.60 = $30,457.
V10 6 quarts at $5 = $30 + filter at $6 = $36. 57 x $36 = $ 2,052
7.3 15 quarts at $5 = $75 + filter at $22= $97. 57 X $97 = $ 5,529
fuel filters
V10 $13 x 9 = $117
7.3 $41 x 9 = $369
7.3 164,000 miles at 14mpg at $2.60 = $30,457.
V10 6 quarts at $5 = $30 + filter at $6 = $36. 57 x $36 = $ 2,052
7.3 15 quarts at $5 = $75 + filter at $22= $97. 57 X $97 = $ 5,529
fuel filters
V10 $13 x 9 = $117
7.3 $41 x 9 = $369
My 7.3 is an obs, but it gets 22 mpg. Most of the srw super duty guys get about 18-19. Way above the 14 mpg you quote.
Very few diesel people use sythetic oil. The majority of us use rotella t or motorcraft, which comes in around $2 per quart. My 5.4 only holds 6-7 quarts of oil but my oil change costs more than it does in my 7.3 because I use synthetic in it. So the price of the oil change depends on which kind of oil you use. If we both used the same kind of oil my change would be higher, but you use synthetic and I don't. So at the end of the day more money came out of your pocket.
I pay $20 for my fuel filters at napa. Half of the price you quote.
Postmaster
Joined: Apr 2008
Posts: 4,724
Likes: 4
From: Rogersville, TN
Yeah, they are too d*mn expensive. That's what's wrong with them lol. I get a purolator pure one for mine. Runs about $9-10 at advance.
Fleet Mechanic
Joined: Feb 2007
Posts: 1,852
Likes: 39
22??!! Wow... My '02 7.3 consistently gets 14 mpg combined town and highway. And I never go over 70 mph.
Postmaster
Joined: Apr 2008
Posts: 4,724
Likes: 4
From: Rogersville, TN
The worst I've ever gotten out of mine unloaded was 19 mpg and that was running 70-75 the whole way. I get 21-23 if I run it 60-65. On my daily trip i drive 80 miles round trip and about 70 miles of it is highway. I don't drive it in the city enough to test the mpg there.