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Old 05-07-2008, 02:06 PM
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quick question

are the 94-98 powerstrokes I.D.I or not? if not what exactly is the difference between those and 00-03? injection?
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Old 05-07-2008, 02:09 PM
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Powerstroke=HEUI (Hydraulic Electric Unit Injection) 94.5+
IDI= Indirect injection (85or86-94)

Powerstroke is turbo direct injection

Idi is natually aspirated like a gasoline engine plus indirectly injected.
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Old 05-07-2008, 02:45 PM
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No the 94.5 - 97 are not IDI as already stated, and there are alot of diffrences between the superdutys and the OBS trucks, some of the diffrences of the top of my head are:

-Larger injectors
-Intercooler comes on the 99-03 7.3L
-94.5-97 have manuel fuel pumps while superduts have electric
-Things are moved around like alternator, etc.
-HPOP
-Turbos diffrent
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Old 05-07-2008, 07:18 PM
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so if they have a manual fuel pump can you turn the pump up? cause i have a 97 and if i can do that that would be sweet
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Old 05-07-2008, 08:21 PM
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by manual fuel pump that means that the fuel is pressurized and transfered to the injectors by a pump that is connected to the engine. You can up the pressure to the injectors by doing the FPR mod, but that is about it.
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Old 05-08-2008, 04:25 PM
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to piggy back on that the mechanical pump located in the valley is only a fuel lift pump (only draws fuel from the tank and supplies it to the engine). 94.5+ do not have an injection pump like you would see on a cummins or gm 6.5. They were amongst the first common rail injection meaning that fuel is continuously supplied to the injectors. The computer times the engine through signals sent to it via the cam position sensor. Instead of a fuel injection pump the engine uses an HPOP (high pressure oil pump) which pressurizes engine oil and supplies it to the injectors and when it is time for that cylinder to fire the computer energizes a solenoid located on top of the injector which allows the highly pressurized engine oil to enter the injector body and pop off the injector which already has fuel ready and waiting. the IDI went up until 94 (the first half of the model year) and utilizes a fuel injection pump which supplies the injectors with the fuel to fire the injector and the properly metered fuel to cause the cylinder to fire. later 7.3 IDI's were turbocharged however they were not powerstrokes. again immediate differences are: 7.3 IDI...injectors visible from on top of the cylinder head with steel lines running to them and small rubber lines running between them. Utilize a fuel injection pump. 7.3 Powerstroke or DIT (direct injection turbocharged): injectors much bigger but are hidden under the valve covers. no mechanical fuel injection pump (again the 94.5-97 had mechanical lift pump). the sounds are different and the powerstrokes have more power. 94.5-97 vs 99-03 differences include...the addition of an aftercooler to the 99-03 which also have bigger (higher output) injectors that are split shot rather than singleshot (they fire multiple times per cycle rather than one spritz) the 99-03 have an electric lift pump mounted on the frame rail and usually only have one fuel tank whereas the 94.5-97 have two tanks with a tank selector and a mechanical fuel lift pump located in the valley where it uses a cam eccentric to pump the pump. 99-03 have a crisper sound and tend to run a bit more smoothly. The computers are a bit faster at computing the signals as well. these are just some but hopefully i didn't steal anybody's thunder and hopefully it answered your questions.
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Old 05-13-2008, 10:32 AM
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wow to much for me but it makes it all clear i didnt know
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