How can I get rid of the MAF

[Guam_Guy]

I want to get rid of the MAF without going the stand-alone route. Has anyone done this? I need some info. Also, what vaccum lines have to be kept, I am not worried about emission or anything like that. Only the must-have lines must stay but i dont know which ones are needed.

[SloS13]

I was about to make a joke, but then i thought about it....

I was gonna say 'just hook up a potentimeter and turn it all the time, guessing what kind of air flow you are getting...

BUT that made me think - if a map sensor that puts out 0-5v is made with basically the same limitations as the stock MAF, couldnt you just hookup a MAP with the same upper-limit to your manifold and use the MAF harness to talk to the ECU?

[I am Technoman]

No they don’t speak the same language.

[SloS13]

explain. Im not doubting you, but both simply put out 0-5 volts, right?

[SloS13]

Im thinking some more (uh oh), but... lets say you have an S-AFC..it takes in 0-5 volts and usually converts it, then sends it to the ecu as a 0-5V code... Why not hook up a MAP to the S-AFC, then convert it, then send it to the ECU?

Oh yeah, another thing. I DO have a MAP on my car for my boost timing junk. i can take a reading off it and compare it, and once i get my datalog cable in, i can see how they coincide (or not)

[MikeMurphy]

I would also be interested in the MAP output. I'm putting my money on that they arent even close.

[I am Technoman]

This is somthing that has not been explored. Im not saying it wont or will work but you never know do you?

[C-Kwik]

MAP and MAF signals do not follow the same voltage curve. Speed density fuel management system requires more inputs that can not be simply converted. Keep in mind that in a NA motor, vacuum is just below 0 at WOT. It fluctuates ever so slightly as RPM's increase. And while calculating the total amount of fuel necessary for an MAF is fairly easy once you know the airflow to voltage caluculation, a MAP based program requires you to figure out the volumetric efficiency of the motor to some extent to tune properly. While it's feasible that it can be done, it would probably require some complicated math or some serious trial and error. The only device that I know of that does this is the HKS VPC, which I've heard was discontinued some time ago. It is also application specific so it probably wouldn't be easy to adapt to the KA. And the cost of a VPC was rather high so a standalone wouldn't be such a bad idea.