How come???????? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 23 (permalink) Old 07-19-2007, 12:42 PM Thread Starter
 
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How come????????

How come our venerable 5.9l Cummins/Dodge isn't as fast as though 8 cylinder (6.0l or even 7.3l) international/Ford?

My friend has a 06 6.0l with a 5" exhaust, and a SCT w/custom tune and that truck is a rocket. I have a 4" exhaust, Stage III injectors, Quadzilla, and brand new HTT turbo, and a rebuilt tranny, and the truck is fast, but not Ford fast.

I love my truck, and would never give it up, but it is a little disheartening with a little tune, that 6.0l is barking 2nd gear, and screaming down the highway. Even his old 99 7.3l was fast.

I don't want to start a Ford/Dodge debate, but would like some real answers. And if anybody denies my claims, go drive a ford with a nice tune, and then get into your dodge, and get back to me.

Also how are the new 6.7l cummins doing in this race?
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post #2 of 23 (permalink) Old 07-19-2007, 02:17 PM
 
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my best guess would be rotating mass inline motors are not really designed to spin like a v-8 design yea a power stroke has more pistons and rods and so on but they are smaller and easier to spin or maybe you just need a lead insole for your right foot
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post #3 of 23 (permalink) Old 07-19-2007, 02:57 PM
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Are you sure it is a little tune? What gears does he have vs. what you have? Is he running huge tires like you are? There are a lot of variables that can go into that equation. My trucks is not fast off the line, but once rolling I can keep up or pull away with anyone.
post #4 of 23 (permalink) Old 07-19-2007, 03:36 PM Thread Starter
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by little tune, I mean; plug in his SCT tuner, select the tune, let it download, and off he goes. Thats what I mean. It is definitely not a "little" tune, I should have said "with a little tuning". Tires are definitely smaller, stock size for a 4x4 of that year, gearing not sure,

I agree, off the line my truck is slow, but when I need to pass some one on the highway, there is no problem doing it.

And I also agree that there are alot of variables that go into it, like year, 4x4 vs 2x4, gearing, cab size, etc... but generally speaking these v-8's are just quicker, why?
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post #5 of 23 (permalink) Old 07-19-2007, 03:49 PM
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I don't find the V-8's generally quicker. To me it's on a truck to truck basis.

One thing you have to remember these newer Ford and Chevy V-8's have a fair amount more stock HP than your 99' Cummins, so you have to play catch up to them before they ever add anymore power. Although a V-8 will build rpm quicker and their powerband is higher in the rpm range than our Cummins.

A V motor is built for rpm generally and a inline motor is known for torque.
post #6 of 23 (permalink) Old 07-19-2007, 04:39 PM
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And torque is what pulls the load not horse power.

2001 Dodge quadcab 4x4,Auto transmission,Fass 150/150 pump, Among other upgrades.
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post #7 of 23 (permalink) Old 07-19-2007, 04:40 PM
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Quote:
Originally Posted by todt061458
And torque is what pulls the load not horse power.
:Thumbup:
post #8 of 23 (permalink) Old 07-19-2007, 05:36 PM
 
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you know i raced my buddies ford the other day and i had no problem beating him i mean he got maybe 10 ft infront of me then once i hit third gear i was gone and my buddy has alot of stuff done with his truck like injectors, programer, exhaust, intake, ATS diesel tranny and tork converter.
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post #9 of 23 (permalink) Old 07-19-2007, 05:56 PM Thread Starter
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all is so true. Maybe I am just trying to justify to myself that I need to go faster and have more power.
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post #10 of 23 (permalink) Old 07-19-2007, 05:59 PM
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There you go, now you're getting it.

More power, argh.argh.argh
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