7.3 IDI vs. 7.3 turbo - Diesel Forum - TheDieselStop.com
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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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Old 01-23-2007, 01:57 PM   #1 (permalink)
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7.3 IDI vs. 7.3 turbo

I'm looking to buy a used diesel truck, but was wondering if there are any pros/cons to either engine. I'm not looking to hot rod the thing, and I'll never have more than 10K lbs. on the back of it. Is there a huge difference in fuel economy between the two? What are some things to look for with both? Is there anything that at XXX thousand miles goes out? Any help is appreciated.
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Old 01-23-2007, 02:32 PM   #2 (permalink)
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Re: 7.3 IDI vs. 7.3 turbo

Well there were 2 different 7.3L turbo engines, the IDI and the PowerStroke. As well as the Naturally Aspirated 7.3IDI.

For pure power, the PowerStroke wins. Downside is it is computerized and parts are expensive. This engine overlapped IDI production and started in 1994. 1994 PowerStrokes were limited to manual transmissions only. (1994 was PSD's first year and IDI's last year).

Middle of the road for power is the IDI turbo. Only available from the factory for a couple years, although many older IDI's were retrofitted with turbos. This engine is often mistakedly called a "PowerStroke".

Dirt slow is the NA IDI. Hey, I tow with one every day and it gets the job done. I ran loaded at about 20K# over the appalacians in a IDI NA van with no problems. But you won't win any drag races.

Driven the same way, each engines will get around the same mileage. Towing heavy either turbo engine will get better mileage than an NA.
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1966 Mustang 200 I6, auto, 4 wheel disk, power brake retrofit, Corvette master.

Former vehicles, 1994 E350 7.3L IDI, 1985 International 1654 rollback, 6.9L IDI, (2) 1994 Ford E350 7.3L IDI, 1985 Ford F350 DRW 6.9L IDI, 1985 Ford F350 wrecker 6.9L IDI.

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Old 01-23-2007, 05:11 PM   #3 (permalink)
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Re: 7.3 IDI vs. 7.3 turbo

I should've clarified. I'm looking at a N/A 7.3 and a turbo IDI 7.3. Any estimates on fuel economy, unloaded? Both trucks are 4x4 extended cabs.
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Old 01-23-2007, 05:25 PM   #4 (permalink)
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Re: 7.3 IDI vs. 7.3 turbo

I get 8-10mpg loaded , 15 unloaded. see sig for truck.
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Old 01-23-2007, 08:07 PM   #5 (permalink)
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Re: 7.3 IDI vs. 7.3 turbo

I get 14mpg towing (in OD), 18-19mpg empty with 3.55 gears, 7.3 IDI Turbo. The non-intercooled stock turbo on the IDI is not exactly "optimized" for high power (read: low boost), but it does sound pretty good whistling down the road!
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Old 01-23-2007, 09:20 PM   #6 (permalink)
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Re: 7.3 IDI vs. 7.3 turbo

[ QUOTE ]
I should've clarified. I'm looking at a N/A 7.3 and a turbo IDI 7.3. Any estimates on fuel economy, unloaded? Both trucks are 4x4 extended cabs.

[/ QUOTE ]

I was just covering all the bases. Yea, I'm like that.

Fuel economy will vary with the axle ratio. The last truck I tracked extensively was a 7.3 IDI van with 3.55's. I got about 15.5 mpg in mixed driving and loaded to about 9K.
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1997 Ford F350 SRW 7.3L PSD
1985 Ford Ranger 2.3L 5 speed
1966 Mustang 200 I6, auto, 4 wheel disk, power brake retrofit, Corvette master.

Former vehicles, 1994 E350 7.3L IDI, 1985 International 1654 rollback, 6.9L IDI, (2) 1994 Ford E350 7.3L IDI, 1985 Ford F350 DRW 6.9L IDI, 1985 Ford F350 wrecker 6.9L IDI.

*dual ASE Master Certified, Automotive, Medium & Heavy trucks*

Owner / operator, Patriot Automotive, N Ridgeville OH
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Old 01-24-2007, 11:59 AM   #7 (permalink)
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Re: 7.3 IDI vs. 7.3 turbo

i'm getting 14-17 mixed driving, towing my fj40 rockcrawler i'm getting close to the same i think...
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