Join Date: Oct 2009
Location: Windham, ME
Feedback Score: 1 reviews
There are no electronics on the 7.3l IDIs so you won't find a chip or programmer for them.
Adding a turbo is going to be the single biggest performance mod you can make. Plus you may find your fuel mileage increases, or at least doesn't get any worse, when you add a turbo, because your engine is now getting enough air to burn more of the fuel that's injected. At higher accelerator settings, typically about 15-20% of injected fuel is blown out the exhaust as the black smoke of partially-burned fuel. That can be reduced to about 10-15% with a turbo, because once the turbo lag is taken up you have enough air for a more complete fuel burn. The drawback is they can be expensive and make certain maintenance tasks more difficult.
Nitrous oxide is another performance mod, though it's not really suitable for continuous use. Air is about 20% oxygen, nitrous is 36%. A shot of nitrous has almost twice the oxygen by volume that air does, so it allows more fuel to be burned. Turn on the juice before you hit a hill and keep it on til the top and you'll see a difference. The drawback to nitrous is that you either have to buy a kit (expensive) or build your own (less expensive but not really a job for someone without experience working with flammable gas systems.)
Propane will also add power by causing more of the diesel to be burned, but since it displaces oxygen-carrying air in an NA engine it's best used with a turbocharged engine that can deliver more air than the engine can use. It has the same drawbacks as nitrous, for the same reasons.
The easiest and least expensive tip for getting better fuel mileage is to avoid any extended idling, and to drive like a granny. If you see black smoke in your side mirrors, back off the fuel a bit til it's gone.
Check my lists of common part numbers in my photos! Updated often!
1991 F350 Lariat XLT, 7.3l, 5-speed, crew cab, SRW, 3.55, 2WD.
1990 Jeep Wrangler Sahara, in the process of a major overhaul/upgrade. OM617 on the horizon! Front & rear Dana 44s from a Wagoneer till I get some 1-ton axles built & narrowed, and eventually a front shackle reversal. Diesel YJ, bay-BEE, and not a cookie-cutter 4BT conversion!