Upgrade tips - 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 12 (permalink) Old 10-25-2018, 09:23 PM Thread Starter
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Upgrade tips

I got a 94 7.3 turbo diesel and I want to get the truck up to 800 hp or close to it, its currently stock. Can anyone list stuff I need to do to make this happen. Thank you.
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post #2 of 12 (permalink) Old 10-26-2018, 09:00 AM
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Personally I'd go for at least 900.

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'91 F-250 SC 4X4, 5spd. ATS Turbo, 3:55 diff.
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post #3 of 12 (permalink) Old 10-26-2018, 10:36 AM
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Hey- do you live in South Carolina? Did you just win the Lottery? If not, youíre going to wish you had before you get to 800 horsies.


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post #4 of 12 (permalink) Old 10-26-2018, 01:12 PM
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Drop in a 5.9 12 valve it will cost a lot less in the long run. When it comes to adding power more power to most any motor the first 10-20 percent is rather easy, after that the more you add the harder it gets. Now lots of venders will be happy to sell you Injectors, turbo, intake, exhaust, programing, intercooler, and nitros with the hype that you can all all the numbers together to get what you want. The reality is each additional modification will not give you the same increase as it would if done alone to a stock engine. Are you planning to race this truck? A 800 hp 7.3 would not be a long life motor if you use the HP on a daily basis, When you see all the high HP numbers that people throw around you might want to look at the RPM the engine is turning to get that HP and ask yourself how long the motor will last.
So before I would advise on power upgrades, I have to ask what is the mission for the truck? Daily driver, Race truck, Tow monster, or just general money pit.
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post #5 of 12 (permalink) Old 10-26-2018, 02:18 PM
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I'd go with the 5.9 also. But while you are building the first one be building the second and third one. At 800hp the engine is not going to last very long not to say anything about the transmission either automatic or manual.
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post #6 of 12 (permalink) Old 10-26-2018, 05:36 PM
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Personally I'd go for at least 900.
What the hell, why not shoot for an eaven thousand? It's just as easy to get there as 8 or 900... if you're gonna dream it might as well be BIG.
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post #7 of 12 (permalink) Old 11-24-2018, 05:17 PM
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Ok mitch...

What these guys are saying is 800hp isn't going to happen... never... not a chance...period...

But you can up the hp a bit...

I've been out of the idi scene for a while... but I do read a little bit once in a while and there was a couple people working on some performance stuff...

Intake manifolds and injectors with pumps... engine girdles to keep it together and camshafts to help it breathe...

If I remember correctly your not gonna get more than 350 to the ground reliably... maybe I'm wrong...

I agree that a Cummins swap is a better choice for big hp numbers. I'm in the middle of a 01 24v swap and with injectors and studs, a programmer and turbo upgrade I'm looking at hopefully 450 to the ground... but it hasn't been cheap... my new and revised budget is 10k.

Anyway good luck 🙂

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post #8 of 12 (permalink) Old 11-25-2018, 09:49 AM
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Sea foam?
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post #9 of 12 (permalink) Old 11-25-2018, 09:50 AM
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I got a 94 7.3 turbo diesel and I want to get the truck up to 800 hp or close to it.

You're kidding, right?
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post #10 of 12 (permalink) Old 12-05-2018, 12:51 PM
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Anyone who wants to "upgrade" one of these engines needs to remember that these vehicles were built back in the days when the legal highway speed was 55 MPH everywhere. These trucks (1/4 of a century later) will get all over 65 or 70 MPH any time you need them to with any load (within reason) that you put to them. They can be made somewhat better, but you give up life span. If you want to squeeze them for all they're worth, then don't complain when you poke rods through the block or oil pan, or send the heads into orbit, or wind up with a multi piece crankshaft. You at that point will be pushing everything in that engine beyond its limits. It WILL break. That is the reason freshly built "high performance" engines don't have a warranty of any kind.

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post #11 of 12 (permalink) Old 01-02-2019, 11:23 AM
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The only mod I'd be interested in is one to make it run air only.

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post #12 of 12 (permalink) Old 01-03-2019, 12:33 AM
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The only mod I'd be interested in is one to make it run air only.
That's my favorite mod... I got 798hp on the super special idi dyno... best mod ever! But remember it's only for the "special" people

Last edited by GoodB0Y; 01-03-2019 at 12:36 AM.
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