Their speed density systems are a little different.

Ford's Speed Density is pre-programmed to stock specs. It expects to see certain things happen. It can adjust itself slightly, based on 02 readings and sensors, but not to the extreme of MAF. This is what makes it difficult to work with when modifying the engines. Any change you make in the amount of airflow, and then the SD gets confused. It's getting X readings and trying to correct it, but the corrections it's making arn't doing what the SD wants it to do, so it can't adapt.

There are several books (Motorhaven has them) on Ford EFI.

I've heard that there are difficulties in using a tuning device on the SD's, but again I'm not too up on it because I've never tried to mod a SD. I know it's possible, Lightning guys do it, and there are mustang guys doing it.

 

Yes, speed density can be tuned to work with almost any application, stoked, blown, sprayed, but I don't think I'd try it with a turbo. A bone stock mass air setup will not run a modified very well without some tuning, you can't just throw it on there and think it will "adapt", because it wont....and I know I've said this before. However, it can be tuned for a stroked application given the components are good and they're able to support the power you will be making. Once it's tuned it will compensate for changes in baro pressure, air temp, and even accept minor modifications without too much trouble.
On the flip side, speed density is also tunable, though it does require a little more time if you plan on tuning it yourself. A good wideband O2 and tuning software will allow you to maximize your combo. I've tuned my rig with mass air for a while until the air meter went south, then switched back to speed density and it has worked out rather well thus far.

 

Ya, as far as I know the TwEECer works for the SD, it's about $300. You'd also have to use a laptop computer with it. If you don't have one, I'm sure you could find a used one cheap, it doesn't need to be a very good one.

Either that, or move your desktop to the garage! Pretend your a real dyno man lol

The TwEECer does have a pretty steep learning curve though. It's difficult to use/operate. It'll take some studying and practice before you're good with it. There are support sites I guess that can help.

The PMS by Andersons Motorsports is pretty good. It's about $900 but you don't have to buy the laptop and it's a lot easier to use.

Just do a google seach for each, you'll find tons of info.

Thats the best part about these EECs, it's almost like having a stand alone EFI, but it's just the stock Ford EFI. You can run practically any combo with it and just change a few computer parameters.

 

Another possibility is to find a different PCM. Since Tweecer doesn't support all catch codes, it might be a good idea to find a pcm that is supported, like a Lightning PCM.

SCT software is easy to use and they should have a database for almost every Ford vehicle. It will work with your stock EEC and come with a base tune for your combo, help files and definitions so you're not tuning in the dark. However, I would make sure that the database is complete with trans functions and tables before buying something like that. I got an HOG0 database for a 94 F-150, and it didn't have any transmission functions for the E4OD.

 

The SD EFI conversions for carbed engines are usually throttle body and one advantage you get with the Ford MAF kit is converting it from bank fire to sequential fire which the manifold is already configured for.

I wonder if Ford does a little reprogramming to optimize their kits Mustang ECM for truck 302's.

 

I also heard about the Ford conversion kit's upgrade to sequential firing -thats gotta add a little HP right there if not it should at least make it smoother.

 

that is a very good question, and would be interesting if someone knew.

The sequential injection probably won't give you much, if any more horsepower if nothing else in the computer was changed. The mustang computer though, is a lot hotter than the stock truck computers, so with a mass air conversion, the truck should be more responsive, and a little quicker.

 

My guess is that if they're tweaked, it's only to a minor minor degree. Some of you may not know this but each computer has a code to identify what it's for. There are many different EEC computers, each one slightly different depending on the application. My MAF conv computer has the same code off a mustang computer, so it's a mustang computer but whether or not they'd tweak it w/o giving it it's own code...hmmm? My opinion is that it's probably not something to really think about. Good thought though.

My pretty stock 302 was changed to MAF and it defintely gave me a good 10-20 hp. Whether thats from sequential injection, or the computer...I duno...

My guess is sequential injection is definitely worth a few ponies. Some of the SD mustangs were sequential.

 

I think their EFI kits are pretty much standalone fuel injection systems. They come with little tools that let you program them for just about any application.

 

I was searching through the internet and came across this. What are your thoughts.


Mass air conversion from 95, 5.8 processor (processor number BIO0, last digit zero!) would require running 6 new wires for injectors. Pins 12, 13, 14 ,15 and 38, 39. 2 new wires for mass air sensor at pins 9 and 50. Other mass air sensor wires are power and ground. Pin 2 must be run to brake switch. Switch pin 28 to 18 and 19 to 9 (diagnostic wires). May have to add second O2 sensor, relocate pin 29 to 43 and run pin 44 to second O2 sensor. Stock mass air sensor on 95 CA models is 70 mm, which should flow well over 400 HP.

 

If you google Ford EFi sytems specifically the Mustang crowd , many pro builders sites claim they are building 400-500 horse Ford engines on Stock mass air conversions with no computer tuning adjustments or chips. Just injectors and fuel pump upgrades. Maybe the Mustang guys know more about this?

 

Do you have the url or website info? And look another site that claims the stock MASS air can adapt to heavy engine modifications

 

http://www.off-road.com/ford/bigbron...h/massair.html here ya go. Thanks for your time!

 

:-x22 :-x22 :-x22 :-x22 :-x22 :-x22

 

I found this maybe it can be put in the archive or made a sticky. The article explains very nicely SPeed Density and MAF systems including Edelbrock style standalone Speed Density EFI systems




http://www.wincom.net/trog/efi.html