How come we suck??
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Freshman User
Joined: Aug 2009
Posts: 31
Likes: 0
Good luck with that. There is a reason why guys drop Cummins into their Fords, much cheaper to get high HP and much more reliable at those numbers.
But.......You may be in luck. Swamps seems to be coming out with some things lately that may make some big HP numbers, but who knows.
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But.......You may be in luck. Swamps seems to be coming out with some things lately that may make some big HP numbers, but who knows.
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Elder User
Joined: May 2008
Posts: 860
Likes: 2
From: Liberty Lake, WA
Yes, nothing replaces displacement, nothing. Now forced induction engines artificially increase the displacement and therefore the fuel that can be burned. That means you need to put more air (oxygen) in there and more fuel to make more power. The 7.3 falls on it's face here where the 5.9 just takes a pounding and asks for more. That is as simple as I can make it. The 7.3 was not built to make 400hp, like I do, let alone 800-1000 like many 5.9s do. Yeah, there are many 500hp plus 7.3s out there. They usually lead a short life unless carefully tuned and well cared for.
Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
Thanks Greg. This is a frustrating subject. Many folks more apt than me have been working on this problem for years. This is not a new topic and has been well discussed here and elsewhere.
Elder User
Joined: May 2008
Posts: 860
Likes: 2
From: Liberty Lake, WA
I think thats why there are so many more Dodges at diesel events than any other diesel truck. Doesn't cost near what it does with a Ford to make good HP.
Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
Hey, we don't suck. I am pretty happy with my truck. I long ago accepted I won't ever have the fastest anything. There will always be someone spending more to be faster. My truck is still pretty darned fast. Good enough for me for now.
Posting Guru
Joined: May 2007
Posts: 1,967
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From: Bowling Green, Kentucky
Senior User
Joined: Apr 2009
Posts: 466
Likes: 0
I have had a 5.9 great engine but when i put the power up on it (around 300 hp and 750 tq) the EGTs would get so high so fast when towing i had to tow slower and it felt like i had more weight (same load) behind me then with my 7.3 with a edge tuner with 160 tq option. I can nail it with my 7.3 with 6500 pounds towing and not even get about 1000 degrees. Its a great towing setup but would never be in the same area as my dodge was with getting up and going. That truck was quick could stay dead even with my brothers Harley. To bad the cummins is in a dodge i went threw 4 trans and 3 times was with and ATS trans, And that is the most despicable company i have ever delt with. When something broke it magically wasn't covered under warranty.
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Joined: Feb 2009
Posts: 6,038
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Look more into the injection system and you may understand more about why the differences.
Postmaster
Joined: Jun 2006
Posts: 3,135
Likes: 0
From: Brinklow Md
Gas motors and Diesel motors are ALOT different. As a few people already said, the 7.3 just wasnt built strong enough to hold high HP numbers. The rotating assembly just cant handle it. Then theres the problem with the HEUI fuel system and then the HPOP. Because of the injectors firing off of oil pressure we have to make the power lower in the power band since you just cant get enough volume to fill the pumps and maintain the oil pressure you need at higher RPMs.
Arnt the 5.9s injectors fired off fuel pressure? I cant remember at the moment?
Clay's right.
Lead Driver
Joined: Nov 2007
Posts: 5,578
Likes: 1
Agreed with Chris comparing gas motors to diesels is apples and oranges. Apples and oranges are both round, gas motors and diesel motors are both use oil. Thats about where the similarities end. The only other thing to point out is to look at the stock torque #'s on a straight 6 gas motor compared to the torque #'s on a similar sized v8 motor.
Bottom line. the 5.9 has been around for eons. The longer anything is in existence's the more/easier ways people find to improve it.
Bottom line. the 5.9 has been around for eons. The longer anything is in existence's the more/easier ways people find to improve it.
Senior User
Joined: Feb 2007
Posts: 351
Likes: 0
From: Duluth
9 second v-6
Nope...not wanting to start trouble at all. But to me seems like we're going against the grain. Show me a 9 sec 6 cyl car...won't find any. So why is it that a V8 config makes less sense in a diesel? There are plenty of 2000+ HP cars out there and none of those are inline 6s. I'm just trying to figure out why the inline 6 works better for high HP diesels...or does it????
I am gonna start trouble with this one even though I am not meaning to, and not sure if anyone else caught this one.....three words meaning 9 second v-6 car, Buick Grand National
Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
Edit: I forgot to mention, I almost bought one of those brand new right off the dealer lot back in 88. I was drooling over it.