My dads 1994 F250 w/ 351w was SD

 

Gonna see of I can do some research on this during the weekend. I think i will have time. Thanks for the info.

 

world products makes a 460 ci w style but not cheap

 

While that might be fun I am going to stick with the 351W. This way I know it won't cause any size problems and I am fairly confident I can get the power out of it that I want.

 

I believe that most if not all '94 302s were Mass Air.

Some '94 351s were Mass Air, some were not. Mine is unfortunately speed density. I did luck out though and get the F4TE roller block, so I did not get totally screwed.

All EFI 460s were speed density.

 

As I said, This is the best F150 site with complete info, thats how we all can learn, Thanks guys

 

OK, I need just a tad more help here. I am trying to find out what I have so I went on-line to see what a MAF sensor looks like and it doesn't list one for my year. I also can't find the Speed Density sensor for my truck on-line so I am not sure how to tell what one I have.

I don't think I have a MAF sensor because I don't have anything on my air intake tube, unless I am looking in the wrong place.

 

Mass air sensor is on air intake tube. Map sensor on my 92- 302 is on the left side of firewall . To see what the difference of what both sensors look like go to www.fordfuelinjection.com --click on sensors on the menu.

ps ,Would still like to see a pic of your SuperCharger and drive pully set-up and what make & model. Let me know how it goes

 

OK, so I am more confused now Here's why...

that page you sent to me does have a pic of a MAF sensor and I don't have one of those, never have. But doing some reading there is a page (Ford Fuel Injection EFI Performance Upgrades) that says this: This won't work on Speed Density EEC's, you’ll need to reprogram it or upgrade to MAF

They are talking about superchargers and turbos there. From the reading I have been doing I think I can get the part number of the EEC and look it up to see if it is MAF or SD.

Haven't found a pic of a SD sensor which leads me to believe it is all in the EEC.

 

Look on your emissions vacuum lable on your truck, On it it will show a vacuum line going to the MAP sensor from the intake manifold. Even with Mass air flow, I have seen a MAP sensor with some vehicles.

Did you do any injector upgrades and fuel pressure regulator upgrades? If you did not(if it is a SD system) and ran that engine for a while under boost, you could have ran the engine LEAN(not enough fuel) under boost!! Which would cause all kinds of problems, blown head gasket is a usual problem along with melted pistons. White glazed spark plugs are a good indication of lean running.

What's the boost level you get with it? With 80K miles under a supercharger running stock injectors/fuel pressure regular and no computer upgrades. I would get another engine to rebuild then swap it over. The speed density system is ONLY programmed for normal fueling. NOT for turbos and superchargers. Even though Ford never installed turbos/superchargers in these vehicles. I did learn alot from the Turbo Dodge mini mopar sites(my 85 Plymouth is going to get the turbo setup).

What it boils down to is: More air into the engine, you need more fuel. Speed density can't compesate for the boost but MAF is fully able to compensate as it directly reads how much air is going into the engine. If the 80K miles under the supercharger with bone stock fuel injection system(speed density) and now you have problems, thats intresting!!!

 

well I have a MAP sensor (part number e7ef-9f479-a2a), but it isn't listed in the vacuum diagram. See attached pics.

So does this mean I have a SD setup or MAF setup?

I can't seem to get to my EEC, it's behind a large metal plate on teh driver's side under the kick panel.

 

Here you go buddy, you'll notice I had to do some custom work to get a nice air filter setup.

 

I have never reprogrammed anything or replaced my EEC with a different one. I have the stock injectors. The only mods to the engine are a MSD 6a box for spark, MSD boost timing master (came with supercharger kit), Fuel management unit (came with SC kit), supplimental fuel pump (came with SC kit) and headers. I have made no other engine mods or changed any other electronics at all. So everything else is stock all the way down to the EGR valve.

It's never run hot that I know of and has never had problems with fuel that I know of. I don't know how much boost is going into the intake, never figured taht out. I can't say that I ever had any problems related to fuel being lean or rich...even when I was going 120 MPH on the Bonzai Run (god damn that was fun).

That's about all I can tell you, I don't know more than that. When I bought the SC kit I was told that I don't need to make any mods to the CPU, in fact I was told I couldn't put a chip in it because the SC needed to be normally aspirated (those are the exact words). So I never changed any of that. I was told that the computer would make adjustments as it senses changes. That being said, I was never asked about SD or MAF either so the person who sold me the SC (was at a performance store) might not have known there was a different...I don't know.

 

Ah, the kit did have the fuel managment unit and bigger fuel pump, your OK then! Your engine is a Speed Density system. The 2nd picture is the MAP sensor, that's the main sensor a speed density system uses to know how much air(indirectly) is going though the engine. I have seen your setup before on a 302 Mustang, my friend could not keep tires on the rear at all.

 

Just so I am clear...even though I have a SD system on my engine and this, I am told, will not handle a supercharger (but it actually does), if I want to use a bigger intake, different heads and a cam I need to change to the MAF system, right?