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Old 01-21-2010, 03:06 PM   #1 (permalink)
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7.3 idi exhaust recommendations

I have a 1993 f350 dual with the 7.3 idi diesel (tow rig) Iím looking to put exhaust on it so it sounds half way descant any recommendation and my question is what kind of back presser do I need to keep and or none and what muffler? Thanks
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Old 01-21-2010, 03:59 PM   #2 (permalink)
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Backpressure is your enemy on a diesel, Ford really restricted the exhaust on the IDI's compared to IH apps, IH ran 2.5" duals off the manifolds, stepped to 2ĺ" before the muffler, and a 4" tailpipe out of the muffler, where the Ford system is single 2.5" throughout.
Pretty much any muffler will sound the same as it will on a big block, only with extra rap due to the compression ratio. However, any muffler you cannot see through will raise EGT's, especially those of the chambered variety.
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Old 01-21-2010, 04:20 PM   #3 (permalink)
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Your best bet is to run a muffler with as little restriction as possable. On my 7.3 idi im running a 4" dynomax muffler, when i hold it up i can look right through. If you want it to sound good make sure you run the pipe or pipes all the way to back to make it sound more deep.
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Old 01-21-2010, 04:42 PM   #4 (permalink)
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Other than exhaust is there any other recommendations I have no ideas about diesels I’ve always messed with gas motors and just trying to tinker with this diesel and hoping to learn a few things and get some more power and gas mileage and thanks everyone for your help everyone
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Old 01-21-2010, 04:46 PM   #5 (permalink)
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There is not much you can do to the idi motors. Start with the exh then turn up the ip pump. After that its a turbo kit.
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Old 01-21-2010, 04:53 PM   #6 (permalink)
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Now that I think of it, Dynomax I believe it is does build a system for the idi trucks that ends up in a 4" tailpipe.
But, if you're after power and better economy, the turbo is the way to go.
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Old 01-21-2010, 04:58 PM   #7 (permalink)
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Quote:
Originally Posted by 82F100SWB View Post
Now that I think of it, Dynomax I believe it is does build a system for the idi trucks that ends up in a 4" tailpipe.
But, if you're after power and better economy, the turbo is the way to go.
The dynomax kit is 2 1/2 then steps up to 3 then 4 for the muffler and tail pipe. The part number for the kit is 19430

But yes the trubo is going to be the best mod you can make.
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Old 01-21-2010, 05:49 PM   #8 (permalink)
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Yes I know the turbo would be the best for power and economy but I can’t afford a turbo yet so I’m just trying to get some nice mods on low budget so I’m thinking exhaust and maybe injectors but with injectors would I need a new injection pump and if not what size injectors would anyone recommend
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Old 01-21-2010, 05:58 PM   #9 (permalink)
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Just go to a tractor parts store and tell them you need a muffler for youre old tractor. They should have some 6''dia and 24'' long with 3'' in and out for about $30 or so.
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Old 01-22-2010, 10:47 AM   #10 (permalink)
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so running a straight 4" or 6" pipe would be bad?
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Old 01-22-2010, 11:09 AM   #11 (permalink)
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I ran 3 inch duals from the manifolds straight out the back with out mufflers loud as hell but it sounded good, if you pull a trailer run the exhaust out the sides otherwise the front of whatever you are pulling will be black and it is hard to scrub it off. Also put a better air intake on it that helps alot too I had a 6 inch tall 14 inch wide K&N on mine with the K&N filter top on it improved my mileage more than I thought it would have. With the C-6 3 spd auto, 4.10 gears, and 33s I was getting 15 to 16 on the highway and better if I kept it around 60 mph.

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Old 01-22-2010, 11:27 AM   #12 (permalink)
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My buddy is runnin a cut-off dual dump, and it sounds sooo sick! like a friggin muscle car, Im personally anti-muffler, but thats just me
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