matthoffman22

One of my friends has an 89 Mustang and he has done a couple bolt ons. He has a cobra upper and lower intake, fuel pressure regulator, bigger mass air meter, shorty headers, h-pipe without cats, magnaflow cat back, electric fan, in-fender cold air intake and maybe bigger fuel injectors... not sure.
Does the 89 mustang know to send the right amount of fuel to get the air-fuel ratio where it is supposed to be after there extra air upgradesor do you have to adjust fuel pressure, etc to get it where it is supposed to be?

93 LX FiveO

is his regulator adjustable?

without bigger fuel injectors its not gunna significantly increase fuel supply.

with stock heads, bigger injectors are useless.

matthoffman22

So if someone adds say just a throttle body and cold air intake is the 89 Mustang with MAFgoing to know to send more fuel?

Joel5.0

If he matches the parts correctly.....yes. If you alter the MAF transfer curve, the logic in the computer will react to the new demand......provided it falls within a specification that will not be interpreted as a failure by the system.

stang8689

It will blow up if you drive it