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Old 04-05-2004, 07:35 PM
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cummings diesel

a buddy of mine has an 04 cummings turbo-diesel. He wants to chop off the muffler and put in a straight pipe.... how much power do you think that will add?

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Old 04-05-2004, 07:55 PM
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In itself.......... None........
But, It'll lower exhaust temps, so you can Pour More Fuel in.....
That'll Make More Power............
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Old 04-05-2004, 08:49 PM
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Well people should be able to hear him all the way to Dallas!

Gotta love that sound the Cummins makes.

Soon as they get cheap enough, I'm swapping one into my Chevy.
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Old 04-05-2004, 10:02 PM
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why???

why would you want to do that I have seen on the ford power stroke on a one ton pulling a bobcat most of its life they changed it to duals that was only on there for 3 weeks before they changed it back they had lost over 2 miles per gallon. the diesel exaust sysem is made specifically for that engine, yea it can be modified but how will it turn out?? they spent a lot of money to make it work the way it does
Jesse
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Old 04-06-2004, 12:45 AM
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I heard that other then a chip, exhaust is the single biggest improvement you can make to a diesel. I have an 03 with just a chip and it screams. I know of two Dodges older models 99 or so one makes about 780 tq. and the other somewhere over 1000 tq. I don't know how much is invested in the 1000 tq. but the 780 has around $7000 in upgrades.
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Old 04-06-2004, 12:50 AM
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Re: why???

Quote:
Originally posted by 60convert
why would you want to do that I have seen on the ford power stroke on a one ton pulling a bobcat most of its life they changed it to duals that was only on there for 3 weeks before they changed it back they had lost over 2 miles per gallon. the diesel exaust sysem is made specifically for that engine, yea it can be modified but how will it turn out?? they spent a lot of money to make it work the way it does
Jesse

Well one may have a turbo and one may not. The turbo Cummins engine will be helped by a bigger exh. As would any turbo engine.
You could turn up the boost, but that will ruin a stock auto trans.
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Old 04-06-2004, 12:58 AM
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I agree the downside to all diesel upgrades is destruction of automatic transmissions. The two trucks I mentioned both have had tranny rebuilds after about 10,000 miles of the upgrades. It's best to have a standard tranny or have the "Bulletproof" auto installed(not bulletproof but pretty tough).
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Old 04-06-2004, 12:59 AM
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Yeah, exhaust and chips will definitely give you major increases with a diesel.This is the output stats on a Dodge 5.9L Cummins with one of Banks' kits on it. Pretty impressive indeed. With a little turbo work, you could achieve 1000 lbf without a whole lot of trouble.
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Old 04-06-2004, 01:13 AM
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Don't forget nitrous and propane injection.

I remember seeing a 93 Cummins powered Dodge on TV doing donuts like it was nothing!
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Old 04-06-2004, 07:49 AM
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Removing the muffler in itself will nothing I dont think. It may allow the turbo to spool faster do to better delta P across the turbine, but peak output will not change unless you put a boost controller on it or a chip. My dad has an '02 that is chipped with open exhaust and wastegate unhooked. It makes 40 psi and will pretty much haul ***. I have told him and I will tell you unhooking the wastegate is not a good idea and you can overrun the turbo on top of putting it in a terribly inefficient range. But, I will add that the engine will slip the clutch in high gear when you floor it. Not necissarily good, but gives you an idea of the power.

Chris
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Old 04-06-2004, 01:54 PM
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Here are some good articles:

World's fastest truck, a Banks diesel

There are 3 more links at the bottom of that page.
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