I about to swap a 351w into the Bird, and i'm going from speed density to Mass air. Im using a 70mm sensor with what i believe to be a stock 90's computer from a Mustang. I think i heard somewhere that the computer need to be calibrated for the size of the sensor, but i cant seem to find it. Has anyone else heard this? Would it be easier to replace the wiring harness or should i get a piggyback harness? Also, do i need a new MAP sensor?
the MAF sensor has to be matched, or callibrated for the size injectors you are useing on a 5.0. not the computer. as for a harness, all you need is a "piggyback" MAF harness. i just listed one on ebay with an A9L. you can get them for like 35-40 bucks.
u can find a maf from a sn-95 5.0 mustang, that will be bigger then the old fox maf's and have the same calibration for a HO... but im not sure about the 351, its probley the same tho if your useing same cam. and if your dareing enough, you can go to a junkyard and look for a maf car and pull the plug off and cut back as much wire as you can, then pin it up yourself. and about the map, its a bap now, instead of the vacume line going to it, it's a white tube that comes off and uses that to find the barimetric pressure as opposed to manifold pressure. what kind of work are you doing to the 351? just like a stock 94+ 5.7?
It's a basic rebuild because it's my first, but im adding a gt40 intake, headers, and i just found a cobra computer. I'm going to make an cold air intake for it. I'll replace the cam and heads later when more funds come in:)
Remember, the Cobra computer has a speed limiter and slightly less aggresive timing/fuel curves believe it or not.
How would i get the sensor calibrated? Would i need to buy a new module, or can a shop do it?