I have a 1992 Bronco, 5.0/5spd.
I am currently in the process of
swapping in an "Evergreen" long block
that I just bought from Checkers Auto Parts

I originally wanted to rebuild (with lots of Trick Flow
goodies, and maybee even a supercharger)
but decided to go with a bone stock replacement for now.

Now that I have the original 302 to use as my
core, I want to start building it.

My intention is now, to have my stock engine for winter (when I need 4 wheel drive just to get around)
and a radical engine for summer (for FUN!)

I understand that first, I must install the MASS air
actually I hear that it will make either engine perform better

I do not understand what the Mass air conversion actually
does??????

Is it possible (or advisable) to pick the mass air componenets off of a junk yard car?

Jegs advertises the conversion kit for $619.00
what should I expect to spend for it at the boneyard?

 

The mass air conversion kit comes with a new air box cover with mass air meter,a wiring harness for injectors and air meter and a manual tranny mustang computer.The mass air system measures the air coming into the engine,the computer uses this to adjust the fuel delivery.The kit also converts your injectors from bank firing(4 at a time) to sequential firing.Your map(manifold pressure) sensor becomes an absolute or atmospheric pressure meter.Several guys have fabed they're own kits with used parts.Do a search,there was a recent thread on this.The ford kit is easy to use(plugs in)but cost's more.

You do not need to convert to mass air to make your truck run like a bat out off hell.There are alot of the 5.0 mustang guys who do this all the time.The 86-88 mustangs did not have mass air,neither did the early lightning pick up.Go to the corral.net and do a search,ask questions.Some off those guys have good websites with a lot of tech stuff.The biggest thing with speed density is you need to keep the vacuum good to avoid having problems.That means high lift low duration cams and wider lobe seperation(less overlap,the amount of time both valves are open) to keep the vacuum up.Actually the 5.0 guys swear a speed density car runs better at wot.

Yes mass air is easier to tune and more friendly to engine mods,but no it's not absolutely necessary.You can get a custom chip burned for about the price you'd pay for a junkyard mass air kit to adjust for your engine mods.

Billy

 

The Speed Density fuel managment system that is on your motor now will not function properly with highflow heads, big cams and such... You can get away with exhaust and minor intake mods. But anything major will create havoc for your motor (missfires, poor fuel economy, stalling, etc...) Buying the conversion kit is the simplest way to go. If you start pulling parts of mustangs, crown vic's and other motors your going to be in for a lot of head achs. Here's a link to a good site explaining Speed Density and Mass Air Flow. http://www.off-road.com/ford/bigbroncos/tech/massair.html

 

Go to the corral.net,there is one guy in particular who has a web site for speed density cars.I hear people say that you can't make engine mods with speed density,All I know is there are alot of pre 89 mustangs that run major engine mods on speed density.I agree it is easier to convert to mass air and deal with drivability issues.I would also recomend the ford kit if you do swap.In the long run by the time you have a chip burned it may be almost as expensive to convert to mass air.I faced the same issues when I rebuilt my 90 302.I'm running a comp cam made for speed density,ported stock heads and intake,shaved heads and flat top pistons(9.5) compression.No drivability isues.I hesitated to make major mods because of the mass air issue.If I had it to do over again,I'd run a gt-40 upper and lower and gt-40 x heads or the explorer gt-40p heads and intake.

Billy

 

Check out 50tech.com.Lots of good info on speed density and mass air.

Billy

 

Thanks a lot for all the info and for the links!

 

 

You guys forgot to let him know he has an E4OD trans and that means the more expensive kit also the Bronco tech article shops that are listed are dead links. The number that they give for the processor does not match anything Ford or anyone else has. If your interested let me know i can give you a Ford part number for a 302 E4OD EEC-4 for MAF. Email me for info tothfngclw3@comcast.net I did an awful lot of research after being sold a B303 cam HO roller Motor.

 

Ok im kinda knew at the whole truck conversion thing but i do have an 88 mustang that i just converted to mass air do to the fact that i put .030 pistons a trick flow stage 1 cam , heads , intake and etc. The car wouldnt idle for crap " surged for an idle all the time" and ran really rich no matter what i did! As for putting a chip in it, my buddy owns a performance shop an burns diablo chips an they dont go bak that far, 93 mass air car is the earliest! So if your goin with a bigger cam convert it to mass air! All the vaccum non-sense isnt true. My car had more then enough brakes and vaccum, the computer just coulndt figure out where to set the tps to idle so it would surge! So to sum it all up...... CONVERT IT!

 

to make speed density happy you must select a cam with a 114* lobe seperation or more. if you install a cam with less lobe sep you will have idle issues. here is a great site www.fordfuelinjection.com read/learn and here are some kits http://rjminjectiontech.com

you can run aftermarket heads, intake,throttle body and headers on speed density just fine. but plan on calling a custom cam grinder to get one tailored to your build this will give you the best drivability. some cam manufacuters have good off the shelf SD cams as well but it depends on what your building.

Massair88coupe, i would find another shop honestly the ecu's hadnt changed much from 88-93 and if you run an A9L or A9P your friend should be able to work that but i am not a fan of diablo chips anyway. a dyno tune with a custom chip burn would be the way to go. and for speed density guys a tweecer is a great thing