more power in a 7.3 IDI? - 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 56 (permalink) Old 08-30-2012, 12:41 AM Thread Starter
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more power in a 7.3 IDI?

hey, i have a 94 f250 with the 7.3 IDI non turbo, and i was wondering how to get more power out of this thing. any sugestions? need be, i am on a tight budget so the cheaper the better
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post #2 of 56 (permalink) Old 08-30-2012, 05:48 AM
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Turbo.

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 56 (permalink) Old 08-30-2012, 11:00 AM
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Mandrel bent dual exhaust with free flowing mufflers would be a good place to start.
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post #4 of 56 (permalink) Old 08-30-2012, 11:33 AM
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Learn to live with it.

Regards,

Paul - Pocono Mtns. USA
02 E350 15 Passenger Cream Puff, 92,000 Miles, 5.4L Gasser

'90 E350 7.3L Ex-Ambulance High Top 420K Miles, No Turbo, Stock Stock stock, No ELC! (Extended Life Coolant) & 10 Oz. Bars Stop Leak. 10 wonderful cool years using Freeze12 without any AC system modifications. Retired with blown trans.


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post #5 of 56 (permalink) Old 08-30-2012, 04:12 PM
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Learn to live with it.
Can't get cheaper then that!

New truck: 1988 F-350 1 ton dualy 2*4, 7.3L IDI Naturally Aspirated, Dual tanks with Camper package.
Mods: Enhanced gauge cluster; Transmission temp, rear diff temp, coolant system pressure, Vacuum pressure, Fuel pressure, Crappy tire Air horn Kit, Raycor pre filter/water sep. All LED Dash lighting, Parker LFS tranny filter, super duty tranny cooler, gerret turbo, waste gated (pending).
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post #6 of 56 (permalink) Old 08-30-2012, 04:44 PM
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Learn to live with it.
For sure! Other than a turbo helping with the pulling power, they are what they are. Some guys on the other IDI sites were bragging about turning a blistering 66 MPH in the 1/4 mile drags with a lightening fast time of 19.8 seconds. According to Car & Driver's review all 5 new 4X4 gas engine 1/2 ton pickups turn the 1/4 mile right at 94 MPH in 14 seconds.
Saw a buddy the other day that works in the oil patch out of state who makes wheelbarrows full of money. He had a nasty-fast Dodge Viper for a couple years, sold it when the thrill wore off and just bought a new Ford diesel, 6.4, 6.7 (whatever they are). He's not the type to B.S., but he said he was absolutely amazed at the acceleration and power of the new Ford. Said the power is not that much far behind his Viper. That's saying something for a stock new diesel pickup.

Heavy truck and diesel mechanic (thankfully retired after 30+ yrs)
'91 F-250 SC 4X4, 5spd. ATS Turbo, 3:55 diff.
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post #7 of 56 (permalink) Old 08-30-2012, 06:07 PM
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For sure! Other than a turbo helping with the pulling power, they are what they are.
This is true if you want cheap, junkyard parts.

There is a decent amount of aftermarket available for these now.
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post #8 of 56 (permalink) Old 08-30-2012, 11:30 PM
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If leaving it na a torque cam and free flowing exhaust will perk it up some.

91 F350 crew cab 4x4 7.3 ats and intercooled with cut down 2000 ps cooler, bigger turbo comp,head studs, torque cam, coated rockers , balanced. very good power.

made 218hp/461tq on a mustang dyno lasst dec with 80k on the rebuild
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post #9 of 56 (permalink) Old 09-01-2012, 02:08 PM
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For sure! Other than a turbo helping with the pulling power, they are what they are. Some guys on the other IDI sites were bragging about turning a blistering 66 MPH in the 1/4 mile drags with a lightening fast time of 19.8 seconds. According to Car & Driver's review all 5 new 4X4 gas engine 1/2 ton pickups turn the 1/4 mile right at 94 MPH in 14 seconds.
Saw a buddy the other day that works in the oil patch out of state who makes wheelbarrows full of money. He had a nasty-fast Dodge Viper for a couple years, sold it when the thrill wore off and just bought a new Ford diesel, 6.4, 6.7 (whatever they are). He's not the type to B.S., but he said he was absolutely amazed at the acceleration and power of the new Ford. Said the power is not that much far behind his Viper. That's saying something for a stock new diesel pickup.
I'm sorry to say but you are misconceived about the power an idi is capable of. There are a lot of guys running 20+psi on stock engines. The biggest limiting factors on these engines are the fuel and the turbo. The turbo is an easy fix cus it isn't all that hard to fab one up or have someone else fab it for you. But now the fueling issues have been solved too. There are two guys over at FTE running Db4 injection pumps that are pushing quite a bit of fuel. NMB2 is making 356/676 with his setup. He is running a 132cc IP on his fully built engine. RacinNdrummin is making 341/759. His setup is a stock IDI turbo block with around 175k miles on it. He is running a 158cc IP. There are also currently other guys doing power builds too. Just right y'all should know that it has been proven wrong that the IDI can't make power cus it has been proven otherwise...
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post #10 of 56 (permalink) Old 09-01-2012, 06:52 PM
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But not on a budget.
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post #11 of 56 (permalink) Old 09-01-2012, 09:22 PM
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I didn't realize NMB2 posted above. Haha. Anyway I never said it was on a budget. I was more off on a tangent cus LMJD was poking fun at those guys only running a 19.8. I just wanted you all to know they could do a whole lot better than most think...
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post #12 of 56 (permalink) Old 09-02-2012, 01:07 AM
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But not on a budget.
Not everyone that owns an IDI tries to fix it with shoestrings and bubble gum.
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post #13 of 56 (permalink) Old 09-02-2012, 01:13 AM
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You can do alright with a DIY propane setup just got to get air in that motor being na that's your enemy (lack of air) iv driven a idi with a tq cam it's worth it if you have a tq can the intake opened up and a ok exhaust and propane you should be happy with the boost in power

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 #14 of 56 (permalink) Old 09-02-2012, 05:38 AM
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But not on a budget.
Plus a former member here who was a retired FoMoCo IDI engine rep during the IDI years stated more than once that Ford found repeated failure over time of a particular engine component when boost is continually run over 12-15 psi. Being as he had nationwide data coming in plus Ford's massive R&D departments, I'd put more stock in what he said compared to anyone just parroting info from forum to forum based on one or two engines but never spent a day actually earning a living in the diesel industry. Most of us apreciated his input engine-wise, but he dropped out after a year or two when 3 members informed him he was full of crap. All 3 members later grenaded their engines within a two month period and are still over on a couple other forums.

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Last edited by LMJD; 09-02-2012 at 05:43 AM.
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post #15 of 56 (permalink) Old 09-02-2012, 07:27 AM
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If you want to spend a lot of money then why would you get an IDI? There's easier ways to spend a lot of money and get a lot of power out and you will get more power, too. The appeal of the IDI is its simplicity and low cost.

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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