Coast Resorts Open Roads Forum: Tow Vehicles: Diesel vs gas......................
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 > Diesel vs gas......................

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Sport45

Not far enough from Houston, TX

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Posted: 11/05/12 07:17pm Link  |  Quote  |  Print  |  Notify Moderator

Taco wrote:

My truck will pull up a grade faster than an 06 duramax stock for stock because it has more horsepower. Doesn't matter if it is 8k or 14k.


Don't start that again. [emoticon]

You know you're outnumbered and will be beat down even when correct, right?

Horsepower only counts here if you can get it below 2500 rpm. [emoticon]


’19 F350 SRW CCLB PSD Fx4
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'83 F100 SWB 4x2, 302 AOD 3.55. (parked)
'05 GMC Envoy 4x2 4.2 3.73L.
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transamz9

Lawrenceburg Ky

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Posted: 11/05/12 08:23pm Link  |  Quote  |  Print  |  Notify Moderator

Crazyfoe wrote:

Who the bleep cares..does it do the job safely or not? It's like a fricken pissing match to which no side is going to convince the other so why bother....no one is going to take the test...again why bother. I don't care what people think anymore....I love my earth day truck and at the end of the day all that matters. But since your going to continue anyway I've got a 6-pack and popocorn ready....


Evidently you do if you are reading this thread.


2016 Ram 3500 Mega Cab Limited/2013 Ram 3500 SRW Cummins(sold)/2005 RAM 2500 Cummins/2011 Sandpiper 345 RET (sold) 2015 Sanibel 3601/2008 Nitro Z9 Mercury 250 PRO XS the best motor made.

Rvndave

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Posted: 11/06/12 12:55am Link  |  Quote  |  Print  |  Notify Moderator

Torque can be measured, horsepower is a calculation using torque and RPM. Torque is what turns my wheels. If someone wants to use a higher HP number and think they are going to be at the top of a mountain first, you will see them at the top, but only if the diesel waits for them!!!!! Another factor not being considered is the fact that the air is thinner as we go up the mountain, a turbo or supercharger reduces this power loss. I don't see how a naturally aspirated gas engine with lower torque numbers is going to beat a turbo diesel with comparable loads, and wind resistance to the top of a mountain. I suspect Hannibal is going by the seat of the pants feeling, or his past diesel had problems with his engine that reduced power output.


2003 Jayco 308fbs eagle 33' tt, towed by a 2003 Ram 3500 slt, quad cab dually, cummins diesel ho, trailer towing package, with 6 speed manual. Hauls better 1/2, 3 kids, myself, and a 2003 ez go clays car.. I have added so far, neon lights, clearance lights, back up lights, black light, lift kit, mud tires, and everything necessary to make the golf cart street legal. It's now ready to spend the winter in the garage for more mods. More neon, strobe lights, alarm, a pa system, maintance, and whatever else that comes along. This golf cart does wheelies and travels thru 7 inches of mud when need be. Two honda eu2000i gens twinned to supply the electrical power. Latest addition an 04 Honda Goldwing. [url]http://www.hometown.aol.com/rvnagain/myhomepage/profile.html[url]

transamz9

Lawrenceburg Ky

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Posted: 11/06/12 04:17am Link  |  Quote  |  Print  |  Notify Moderator

For me, this is not about a race to the top of the mountain. It's about the ease of the pull. The longevity of the engine being put under the stresses of towing heavy and being able to pass a fuel station. Yes I would agree that the diesels of yesteryear were slow and less powerful and it took me years to warm up to them but now, well let's just say IMO you have to types of motors. One is a truck motor (diesel) and the other is a car motor that they put in a truck body (gas). Get what you want and drive it. I have had them all, I drive them all every day. For what I do with mine, a gas motor will never hold up for any time.

Hannibal

Tampa Bay Area

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Posted: 11/06/12 05:21am Link  |  Quote  |  Print  |  Notify Moderator

transamz9 wrote:

Hannibal wrote:

Don't know about the 6.0 GM vs the 6.6L Dmax but my 345hp/365ftlbs '05 Hemi powered 2500HD Ram towed our previous 10,400 lb 5th wheel up the grades faster than our 250hp/460 ftlbs '03 2500HD Ram. With horsepower you can make torque through gear reduction. That extra 100 hp made a pretty big difference at highway speeds.


Here we go again Hannibal, comparing apples to oranges. I have told you before I believe, I will be more than happy to meet you somewhere with my stock '05 cummins and we can do some test runs. Your 345 hp/365 lbft against my 325 hp/610 lbft. I'll bring my 18,000# trailer and you can pick the 500 mile route.

I see you now have a 2010 5.4 Ford? 320 hp? even better comparison. You should have the 6 speed trans, better for you. I'm still up for the test, are you?


My 2010 5.4L F250 advertises 310hp/360ftlbs and has a 5spd TS transmission. What your truck has to do with my two previous trucks and how they compared towing the same 5th wheel, I don't know. I'm well beyond the age of racing up grades to prove a point. My comparison between my two trucks is fact. Just the same, if you're going to expect me to believe you tow 18000 lbs up a 6% grade 65mph in O/D, you need to cut back on the burritos. If we're ever in the same area and it's convenient, I'd be happy to hitch up your 18000 lb 5th wheel to my truck for no other reason than to see how it does good or bad. Fact is, if the grade requires 300hp to pull, your truck will be at 3k rpm, mine will be at 5k rpm IF they both produce their advertised HP. As elevation goes up, mine goes down. You'll never see a post where I've denied that. I can easily afford my 7th diesel pickup. If the gassers didn't perform to my satisfaction, I would be back in a diesel long before now.


2020 F250 STX CC SB 7.3L 10spd 3.55 4x4
2010 F250 XLT CC SB 5.4L 5spdTS 3.73
ex '95 Cummins,'98 12v Cummins,'01.5 Cummins,'03 Cummins; '05 Hemi
2017 Jayco 28RLS TT 32.5'

Hannibal

Tampa Bay Area

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Posted: 11/06/12 05:30am Link  |  Quote  |  Print  |  Notify Moderator

Rvndave wrote:

Torque can be measured, horsepower is a calculation using torque and RPM. Torque is what turns my wheels. If someone wants to use a higher HP number and think they are going to be at the top of a mountain first, you will see them at the top, but only if the diesel waits for them!!!!! Another factor not being considered is the fact that the air is thinner as we go up the mountain, a turbo or supercharger reduces this power loss. I don't see how a naturally aspirated gas engine with lower torque numbers is going to beat a turbo diesel with comparable loads, and wind resistance to the top of a mountain. I suspect Hannibal is going by the seat of the pants feeling, or his past diesel had problems with his engine that reduced power output.


If you're going to spec an engine for a motorhome or OTR truck, how do you calculate how much torque will be needed to run 60mph up a 6% grade? You first have to know how much horsepower is needed. It's horsepower. Torque is a static measurement. It implies no movement at all. Horsepower is a measurement of work over time. If you break it down further, you'll see that the NA gas engine loses a lot of horsepower at high altitudes and it's peak horsepower is at high rpm so unless the driver is willing to run at 5k rpm, reduce that hp to it's 4k rpm value and it makes better sense why the diesel tows better with two equal hp trucks. There's more to it than just peak hp and more torque means you make more hp at lower rpm but it's still horsepower that determines the speed you're able to tow.

Taco

VA

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Posted: 11/06/12 05:50am Link  |  Quote  |  Print  |  Notify Moderator

For all those that say torque turns my wheels that is exactly right. torque at the wheels not torque at the crankshaft.

An example: 660 revolutions of a tire per minute to go 60 mph.

Duramax LLY as found in MOST 2006 gm diesels

660 X 3.73 X 1.00 = 2461 rpm

at 2500 rpm per hypertech dyno chart a lly makes 500 ft lb

500 x 3.73 x 1.00 = 1865 ft lb to the WHEELS at 60 mph


2012 silverado 6.0

660 x 3.73 x 2.36 = 5800 rpm (200 below redline)

at 5800 rpm per hypertech dyno chart the 6.0 makes 270 ft lb of torque

270 x 3.73 x 2.36 = 2377 torque to the wheels

So at 60 mph at max effort the 6.0 is capable of 512 more ft lbs or TORQUE to the wheels than a lly duramax.

I already know what the diesel guys will say "ain't no way no gasser will out tow my big tough diesel."

which is why I said it is like explaining physics to a chimp

transamz9

Lawrenceburg Ky

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Posted: 11/06/12 06:57am Link  |  Quote  |  Print  |  Notify Moderator

Taco wrote:

For all those that say torque turns my wheels that is exactly right. torque at the wheels not torque at the crankshaft.

An example: 660 revolutions of a tire per minute to go 60 mph.

Duramax LLY as found in MOST 2006 gm diesels

660 X 3.73 X 1.00 = 2461 rpm

at 2500 rpm per hypertech dyno chart a lly makes 500 ft lb

500 x 3.73 x 1.00 = 1865 ft lb to the WHEELS at 60 mph


2012 silverado 6.0

660 x 3.73 x 2.36 = 5800 rpm (200 below redline)

at 5800 rpm per hypertech dyno chart the 6.0 makes 270 ft lb of torque

270 x 3.73 x 2.36 = 2377 torque to the wheels

So at 60 mph at max effort the 6.0 is capable of 512 more ft lbs or TORQUE to the wheels than a lly duramax.

I already know what the diesel guys will say "ain't no way no gasser will out tow my big tough diesel."

which is why I said it is like explaining physics to a chimp
So if you are comparing the 6.0 at 200 RPM's below the redline then why aren't you doing the Duramax the same?It is capable of turning way more than 2461 RPM's. Apples to Apples.

I'm not saying a gasser won't out tow my oil burner. It might tow as well, it just has to work a lot harder and so does the transmission. I will say that a stock 5.4 or 6.0 gasser will not out tow my diesel.

transamz9

Lawrenceburg Ky

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Posted: 11/06/12 07:14am Link  |  Quote  |  Print  |  Notify Moderator

Hannibal wrote:

transamz9 wrote:

Hannibal wrote:

Don't know about the 6.0 GM vs the 6.6L Dmax but my 345hp/365ftlbs '05 Hemi powered 2500HD Ram towed our previous 10,400 lb 5th wheel up the grades faster than our 250hp/460 ftlbs '03 2500HD Ram. With horsepower you can make torque through gear reduction. That extra 100 hp made a pretty big difference at highway speeds.


Here we go again Hannibal, comparing apples to oranges. I have told you before I believe, I will be more than happy to meet you somewhere with my stock '05 cummins and we can do some test runs. Your 345 hp/365 lbft against my 325 hp/610 lbft. I'll bring my 18,000# trailer and you can pick the 500 mile route.

I see you now have a 2010 5.4 Ford? 320 hp? even better comparison. You should have the 6 speed trans, better for you. I'm still up for the test, are you?


My 2010 5.4L F250 advertises 310hp/360ftlbs and has a 5spd TS transmission. What your truck has to do with my two previous trucks and how they compared towing the same 5th wheel, I don't know. I'm well beyond the age of racing up grades to prove a point. My comparison between my two trucks is fact. Just the same, if you're going to expect me to believe you tow 18000 lbs up a 6% grade 65mph in O/D, you need to cut back on the burritos. If we're ever in the same area and it's convenient, I'd be happy to hitch up your 18000 lb 5th wheel to my truck for no other reason than to see how it does good or bad. Fact is, if the grade requires 300hp to pull, your truck will be at 3k rpm, mine will be at 5k rpm IF they both produce their advertised HP. As elevation goes up, mine goes down. You'll never see a post where I've denied that. I can easily afford my 7th diesel pickup. If the gassers didn't perform to my satisfaction, I would be back in a diesel long before now.


I'm not talking about a race up a hill either. I was just stating that you were comparing "your" 2005 Hemi to your 2003 Cummins. Not Apples to Apples. If you were comparing your 2005 Hemi to a 2005 Cummins then I would say O.K. There is 75 HP and 150 lbft of torque difference between an 03 and 05 Cummins.

No I'm not saying I can tow it at 65 up a 6% in OD in stock form. I can do it @ 70 with stock tires but not at 65. 68 is when my truck kicks out of OD with my foot on the floor in stock form. With the size tire I have now it kicks down at 74. But like I said, I'm not racing, just holding my speed. I like to run between 68 and 72. That's where I get "MY" best MPG (programmed)with my 13' tall 5er which is 10-11 depending on head wind.

Hannibal

Tampa Bay Area

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Posted: 11/06/12 09:59am Link  |  Quote  |  Print  |  Notify Moderator

The point is, the '03 Cummins had 100ft/lbs more torque while the Hemi had 100 more hp. The 100 more hp towed 10k lbs faster up the grades.

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