Re: Mass-flo EFI Mass-air sensor question
Good question, how easily it can be done though is a bit "it depends"
Your Mass-flo EFI uses a rider chip to essentially change 3 things. There is more the CAN change, but that is about all they change to make it work, and work pretty well
- firing order
- MAF curve
- injector characterisitics
The firing order isn't important as a 390 and 302 are the same, and moreover even if it was on a 351 or a 351 cam it would just really matter at idle and not that much
However, the injector programming is different for your bigger injectors. If it wasn't you could just pull the massflo chip and run a 93 Mustang MAF without the adapter using stock Ford settings.
However if you do that the injector files are wrong
What I did was swap to a Moates Quarterhorse chip, reprogrammed it far more than Mass-flos less comprehensive change by shutting down a lot of options, mostly emissions related and tweaking the myriad of things that you can in an A9L and eventually changed to a blade type late model Ford to allow more airflow than the tiny 82mm Mass flo sensor has. My motor breathes pretty deeply, so having the big MAF setup really helped it up top
It also allowed me to tweak injector slopes, O2 sensor delay, and most important IMHO is change injector timing to match my cam events along with the timing curve, which made more power everywhere and mellowed the idle like I changed the cam
My 489 EFI runs great now but it ended up adding about 1000 in parts and a good summer of tuning and tweaking.
70 Sportsroof, 427 FE/489 cid, TKO-600, 31 spline 4.10, A/C. modified Mass-flo EFI/reprogrammed A9L/CnC ported Victor.