7.3 idi straight pipe - Diesel Forum - TheDieselStop.com
7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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post #1 of 19 (permalink) Old 01-24-2013, 04:38 PM Thread Starter
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7.3 idi straight pipe

Hi everyone! i am very new to this forum ( just signed up 2 minutes ago) . i am currently getting my 1991 Ford F-250 into tip top shape and i had a question, right now im 15 so i want to trick this truck out. if i straight piped it, what would be the pros and cons of doing this, also, i do not know if my truck would sound good, so i was wondering if anyone would have suggestions, also!, my truck does NOT have a turbo on it, it is bone stock. thank you
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post #2 of 19 (permalink) Old 01-24-2013, 07:11 PM
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straight pipe will be loud without a turbo, possibly illegally loud. otherwise no drawbacks

if your truck does what you want then I suggest you leave it alone

if you need more power I suggest you get a turbo, but be sure you need it, it's a lot of money or a lot of work

1992 F250 XLT 4x4 Super Cab 7.3 IDI E40D 3.55 ATS 088 4"R.C 360k
1982 MBZ 300SD W126 California model w/Sunroof, no EGR
1997 Audi A8 Quattro 225k Warm/Cold packages
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post #3 of 19 (permalink) Old 01-24-2013, 07:47 PM Thread Starter
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Ok, thank you so much, my truck is most likely going to be a daily driver so i dont think i need a turbo.
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post #4 of 19 (permalink) Old 01-24-2013, 07:50 PM Thread Starter
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Also i was wondering if there was anything i need to watch for on the 7.3 idi
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post #5 of 19 (permalink) Old 01-24-2013, 08:28 PM
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yea man i have had several idi they r loud str8 piped but brings out the power. things to watch for inj o-rings they go occasionally keep a fuel filter in ur box or keep it changed regular and enjoy they r bullet proof
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post #6 of 19 (permalink) Old 01-24-2013, 09:04 PM
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there is a coolant additive, you can buy coolant that comes with it or you can buy it separately. napa can sell you something, or go to a tractor store and ask for coolant with diesel cooling additive for a ford.

1992 F250 XLT 4x4 Super Cab 7.3 IDI E40D 3.55 ATS 088 4"R.C 360k
1982 MBZ 300SD W126 California model w/Sunroof, no EGR
1997 Audi A8 Quattro 225k Warm/Cold packages
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post #7 of 19 (permalink) Old 01-25-2013, 05:16 AM Thread Starter
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Ok! Thanks!!
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post #8 of 19 (permalink) Old 01-25-2013, 08:54 PM
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Just remember its not a hot rod straight pipes get you pulled over more trust me also I tend to stomp the throttle more just saying

1990 f250 4x4 e4od 7.3l idi
Turbo ip turned down tq screw
315/75r16
3in lift
K&n air filter and home made ram air
5in stack straight pipes
165,xxx mi (I think/hope)
Large tranny cooler
16-18mpg
Soon to be turbo'd with nice cold air and wraped exhauste be for turbo
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post #9 of 19 (permalink) Old 01-26-2013, 11:42 AM Thread Starter
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also another question. my truck has been sitting for a good 3-4 years ( over that time i started up, but didnt drive it on the road). other than checking the fluids and replacing filters, is there anything i need to worry about?
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post #10 of 19 (permalink) Old 01-26-2013, 02:35 PM
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If you know what your doing wheel bearings and u joints and all ball joints also coolant exchange

1990 f250 4x4 e4od 7.3l idi
Turbo ip turned down tq screw
315/75r16
3in lift
K&n air filter and home made ram air
5in stack straight pipes
165,xxx mi (I think/hope)
Large tranny cooler
16-18mpg
Soon to be turbo'd with nice cold air and wraped exhauste be for turbo
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post #11 of 19 (permalink) Old 01-26-2013, 04:30 PM
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I have been pulled over twice for my turbo straight pipe for noise violations and I have 3" from the turbo back I would look at your local laws before you straight pipe it to see what the bylaws say about excessive noise from your truck.

1993 7.3 IDI, crew cab, long box, 4x4 and a half, XLT with ATS turbo.
Glowshift Boost, Trans, Pyrometer gauges with glow shift pod.
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post #12 of 19 (permalink) Old 01-26-2013, 09:59 PM Thread Starter
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Ok, again, thank you guys SO much
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post #13 of 19 (permalink) Old 01-29-2013, 10:56 AM
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DO WHEEL BEARINGS. I am also a teenager with one of these trucks, a 1984 6.9 idi non turbo, straight piped, and i neglected to do simple maintanence for a long time such as wheel bearings, greasing ball joints, tie rods, etc, and i ended up stuck 6 hrs from home on a road trip with a siezed wheel bearing. had to get towed home, new hub and rotor, etc. just over $600 in the end. bought the bearings for the other side for 30 bucks and did it in about 2 hrs on the first try. Save yourself the trouble of towing, etc. also, mine is straight piped as well and i think in sounds great. 25k miles in a year and half all over new england and no trouble, just keep an eye out for cops and lay off the gas if you see one

1984 Red Regular Cab F-250, SRW, 235/85/R16E Cooper Discoverer AT3's, 280,XXX as of April 2014, 6.9 IDI, NA, 4x4 w/ manual locking hubs, T-19 4 speed, Regular Cab, Longbed, Dana 44 front and Dana 60 rear, 2nd Owner! no soup bowl, straight piped, (FREE) Pacific Dually towing mirrors, manual ZD-9 glow plugs, Toolbox, wishing I had a turbo and an overdrive...
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post #14 of 19 (permalink) Old 01-31-2013, 06:09 PM
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Tried straight pipe on my 90 idi, made it 3 days before a found a muffler I could slip in there, Sounded like a nascar when I got on it.

94 IDI Turbo 5 SPD Crew Cab 4X4, 303K, 295/75/16 BFG's, Big ARSS Stereo. (SOLD)
2006 F250 CC SB Lariet V-10

2003 Excursion E.B. V-10,
2018 Escape Titanium
2005 ZX4 ST Focus
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post #15 of 19 (permalink) Old 09-21-2019, 05:57 PM
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I got a 7.3 and a few things I am uncertain about is the fuel pump I'll start and drive it for a hour and then u shut it off and it doesnt want to start unless u pour water on the fuel pump and I was wondering whays the best way to straight pipe and make it sound good
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