Some Power FC questions...

[spirit]

I have a J4 ecu now, looking to go Power FC w/ Boost controller kit.
414-N017 or 414-AN017 & 415-A013

From what I read so far MAF is better than MAP for lower hp & daily driving as well as MAF version is easier to tune, correct? (I don't plan to ever go past 400hp, well under z32 MAF limit) Only real reason I could see my self going MAP is to vent the BOV.

If I go MAP (414-N023) is it same boost controller (415-A013)?

What is the "After minor change" I see on some websites?

[!Zar!]

The After minor change is for blacktop while the before is for redtop.

I wouldn't suggest going map just to run atmospheric... It's dumb and isn't a performance oriented setup. Cool only if you want to hear the, "whoosh".

A boost controller is a boost controller doesn't really matter.

[johngriff]

After minor change for 96.7+ is the one you need to match it up with the j4/type-x setup.

Map is cooler, because all the cool kids do it. If the pipe's pop off, you are still running, you are also tuning off pressure, which in my mind is sexy.

Unfortunately sexy isnt enough reason, lol I'll post later after i've had caffiene.

[steve shadows]

^ well yeah its sexy, but i agree with the OP's sentiments on a street car with conservative tune.

To me however 400whp is not a conservatiev street setup. 400+ demands serious cool kid shit, like a map sensor and seperate temp sensor.


The reason why MAF is "easier to tune" is because it utilizes a thermistor to register changes in heat. A decease in air flow to the engine will register a higher temp on the filiment in the path of the airflow. Basically you know what coming in at the front door, where a MAP is running around the party house taking everyones name.

MAP is better for higher boost turbo apps and when your ems supports a barometric pressure sensor (like haltech and other ems (not PFC)) you can use this in more race applied situations.

:blah:

[spirit]

Thanks guys, good info. :bowdown:

[johngriff]

Yeah what steve said.

OFFTOPIC: New drink "spike" .... jesus christ, I almost had a heartattack, couldnt even finish an 8oz can.

On topic.

MAF measures the volume of air entering the engine, making it limited in its ability to measure airflow(diameter of body is always in focus), or over sized at times, when changing turbos. As well, at the top of a compressor map, there are points where you may have more boost, yet the same amount of airflow. In this circumstance the MAF does not measure this change.

This is a situation where timing would need to be retarded, especially in a pump gas application, because of the higher PSI. A map sensor will always measure the exact psi, and your ignition table will be written around it.

In the end the above example is kind of a non sequitur for a 350hp application, but the strive for precision in measurement remains.