'90 7.3 IDI non turbo Q's - Ford Powerstroke Diesel Forum
7.3L IDI (Non-Powerstroke) Diesels Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 02-27-2013, 07:02 AM
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'90 7.3 IDI non turbo Q's

So I am looking to pick up a daily driver truck so I can park my dually and only use it for towing.. Found a guy with a very very clean 1990 F250, 4x4, ext. cab, 5 speed with a non turbo 7.3..
All I'm wanting this thing for is to drive to work everyday, run errands, throw my softball gear and cooler in the back of it.. Just a daily driver, because I CANNOT drive a car anymore..

Any inherent problems with these trucks?
I've read a lot of posts saying fuel mileage isn't good without turbo on them?
If this is true what kind of turbo can I put on it? I just ordered a new one for my 6.0, so can I rebuild my stock 6.0 turbo and fab that up?
Tuners available for them? Or is this like the old 12v cummins where you just add fuel and it does the rest mechanically?
How will that 5 speed trans hold up if I do put a turbo on it? It has a new clutch, un sure of what kind.

Thanks guys
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Old 03-02-2013, 08:54 AM
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As far a mileages goes, it really depends more on axles.
My 94 7.3 IDI-T has 4:10s, and it barely gets 18 on the highway at 55.

Fuel wise, it is all mechanical, you turn up the pump and you get more go.

Turbo's, I know less than nothing about the turbo on a 6.0, but the the IDI's can't handle as much boost as a 6.0, I don't know the compression ratio on a 6.0, but an IDI is 22:1, As well, the factory turbo IDI's, like mine had bigger connecting rods and wrist pins, steel piston rings, and more boost friendly head gaskets, and it is still a bad idea to go over 14 PSI.

Trans, It ought to be a ZF5, which should be fine.
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Old 03-03-2013, 07:55 PM
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we have had 4 of these work horses.only problems with them relates to the return lines on the injectors. orings will harden and the engine will lose prime and cause hard starts. installed an ats turbo with a 3 inch exhaust on a 1990 crew cab. saw some increase in mpg but mainly more horses. after about 150k had to have heavier springs and hardened valves and seats put in. the zf5 trannys last up to 300k without much but synchronisers. the stock clutch is trouble free for us .
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