Originally posted by mizturyous
so the P28 is a better ECU for my H22a4? If so why is that? I dont know thats why I am asking.............I want whatever will give me the most gains and performance.
it depends. by far and away, the P72 is the best bet for an H22A since it has the ability to control the IAB and has knock sensor monitoring.
the P28 has neither, but they're cheaper and still just as programmable. for a racing application, the P28 is great since it doesnt have the knock and IAB controls.
if you plan on modifying your motor with a single runner intake manifold, the P28 is the way to go as you wont get a check engine light with it as you would the stock ecu or the P72... they both need IAB input from a dual runner manifold.
the P13 on the other hand is just not as controllable from chipping. it lacks some of the expanded maps available on the P28 and P72 ecu's.
this is why you see a lot of chipped P72's and P28's on the market, but very few P13's chipped or chips for them.