400-600hp fuel mileage? - Dodge Cummins Diesel Forum
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post #1 of 19 (permalink) Old 09-05-2008, 05:05 PM Thread Starter
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400-600hp fuel mileage?

What kind of mileage are you guys getting with that kind of hp?


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post #2 of 19 (permalink) Old 09-05-2008, 05:23 PM
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a couple buddies of mine are running around that, one has twins and he didn't know but he was running about 20 psi in his tires and was getting around 15, pumped them up and get alot better. and his is a 12v.

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post #3 of 19 (permalink) Old 09-05-2008, 05:31 PM
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in my old 95 i could see anywhere from 10-21 it all depended on how much i did.
mike

01 2500 4x4 nv5600 with a 650cc p7100 ,and big twins...

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post #4 of 19 (permalink) Old 09-05-2008, 05:33 PM
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Quote:
Originally Posted by johndeerefarmer View Post
18-20
all depends on how heavy my foot is.
mike
ohh yeah i forgot to add that in, your right foot will determine how good or how much you can't see behind you fuel mileage will be.

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post #5 of 19 (permalink) Old 09-05-2008, 05:39 PM
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Like stated, if properly done, you should see little to no change in fuel mileage. Diesels are designed to use only what they need....
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post #6 of 19 (permalink) Old 09-05-2008, 06:03 PM
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Technically it should only get better. at least thats according to the laws of physics, or how heavy your foot is.

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post #7 of 19 (permalink) Old 09-06-2008, 07:00 PM
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why would it get better?

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post #8 of 19 (permalink) Old 09-06-2008, 07:03 PM
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I see low 20's if I watch my foot.

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post #9 of 19 (permalink) Old 09-06-2008, 07:12 PM
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Quote:
Originally Posted by jaymayisback3 View Post
why would it get better?
You're making the engine more efficient.

Intake/exhaust = less work wasted getting air in/out

Timing = more power with same quantity of fuel

Most injectors will atomize fuel better then stockers = more power with same quantity of fuel

Fuel plate = more power at lower RPMs = less revving

Turbo(s) = more efficient then stock = less work wasted

etc
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post #10 of 19 (permalink) Old 09-06-2008, 08:30 PM
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at worst 20ish, babying 22-24

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post #11 of 19 (permalink) Old 09-06-2008, 08:37 PM
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im around 500 and see about 19 around town, driving it like it should be driven!!!!!!!
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post #12 of 19 (permalink) Old 09-06-2008, 09:28 PM
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Since I got the motor back together I have only seen 15 even. But I didn't baby it, and that was good mix of city/highway.

Michael Charlton - Keystone Diesel
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