I have a 1995 Ford F-150 5.8 (351w). I plan on building a 450hp 408w stroker. This build will not work with speed density. I wanted to convert over to mass air. I have a e4od and after doing some research, I have found that my year of truck will not allow for the $650 mass air conversion. I have found a website that will make the e4od a stand alone for $1200. I have to believe that there is a ecu or wiring harness that will allow the e4od, 351w and mass air to work together. If you have any info or help with this problem, I would appreciate your response. Thank you for your time!

 

Isn't your '95 mass air already?

 

no it is not. I believe the 302 came mass air, but not the 351!

 

Well that sucks!
Well I beleive that the 302 maf will run a 351. I would suggest contacting Mustang321 (sorry If I misspelt) as he just went thru this himself.
Cheers,
Popa Tim

 

not sure about mass air, but my 302 eec does run my 351, maybe a lightning eec, or even an a9L? no, a 9 l is not for an e4od. i hate fords and their freaking eecs

 

Why will speed density no support you engine? Hack into the EEC using a program like Tweecer and you can do about anything you want with it. Might be easier than hassleing with a MAF conversion.

 

Thank you for your time and information! I will ask mustang 321 about the conversion. Where might I receive info on programing my eec for high horsepower keeping the speed density? Thanks again!

 

correction, its mustanggt221 (one of our moderators)

 

No offense, but you hate it because you simply don't understand it.

Anyone who understands it...loves it...because it's an amazing system.

The problem here is that the tranny is controlled by the computer, just like all auto trannies are today. Ford left the MAF conv out of the group for the E4OD for good reason. They knew at that time that EEC-IV was going and EEC-V was coming in. They didn't bother making a kit for such a specific, narrow margin of consumers. How many people really want an E4OD truck with MAF...not many....so they don't make them. It would cost you an arm and a leg if they did offer it cuz they would hardly sell any.

You can tweek the stock computer, do a google search for TwEECer and the PMS from Anderson Motorsports. I don't know much about using those for SD, but I know that they use it on the MAF vehicles for tuning and EFI mods.

Don't kid yourself, a stock MAF EFI will not run a 408 stroker, it doesn't run mine and it won't run yours. You'll still need to have it put on a dyno using SCT tuning (best bet), or tune it yourself using a TwEECer or PMS.

- The user contacted me and I suggested that he check out a thread we had a month or two ago here about doing a E4OD conversion...it was about 3-4 pages long and a search using the search function should pull it up.

 

What about swapping out your current tranny for a C-6 or one of the other trannies that the Ford MAF conversion kit works with? You'd get a stronger tranny out of it anyways, with all that horsepower your planning. The only thing I can think of in regards to keeping the speed density system is you can probably tweak it but although the Ford system was the best at the time they're just like an ordinary desktop computer of that era ---slow and dumb, compared to todays computers. I would think the new computer that comes with the MAss air Kit has to be a quicker and smarter computer.Dunno just a guess.

 

ANy idea how much "engine" the stock MAF EFI COULD support??

 

The computers that come with the mass air conversion kits are from '89-'93 mustangs, not notably newer than the stock computers in our trucks, and even older than some. It doesn't take much processor power to operate an engine, so I wouldn't worry about having the newest computer for a vehicle.

 

All depends on the setup. The stock MAF will adapt to a certain degree, but a major change like a 400 horse 393 is too much.

Either way, to get the most power out of it, it needs to be tuned, whether or not it's MAF.

 

I really do appreciate all the info. From what I am gathering here, it is possible to purchase tweecer and adjust my current speed density to adapt to the 408. I do plan on purchasing a better upper and lower efi system. Maybe this will help as well. I do have a dyno close by, so I will ask for help there also. Thank you again!

 

When you go to Tweecer's website it is really vague about what you can or can't do with speed density.. One strange thing I noticed is that you always hear "you have to convert to mass air first" before any performance upgrades becuase its more tolerant of change. But when you look at an aftermarket company like Edebrock they sell EFI conversion kits for carbed hi-horsepower blocks and the kits they sell are Speed Density setup. So that adds to my confusion.