MAFs

[chickenmanq]

This may have been covered before, but who has mass airflow sensors for the ka24e, and how exactly does it work?  I know it pulls more air, but I thought the ECU would have the final say as to how much air gets by.

[trashcan]

MAF sensor doesn't pull in air, it just measures how much air is coming in.  The computer uses this and other sensors to determine how much fuel to inject.  

[matic 240sx]

man... got here to late.. heh..  trashcan is right...  and your car will not run without it... not long anyway

[chickenmanq]

Cool.  Thanks for the info.  Does anyone know where to get one, or are they retrofit items?  I couldn't find any on the internet, but maybe I'm not checking the right spots.  Anyone know how much they cost, too?

[vancouvers14]

looking for a stock one (car-part.com) or an upgrade(mustang mafs should work)?

[trashcan]

Unless you have tested the Mustang MAF before, usually its not a good idea to just drop in a new air-flow sensor/meter (whatever).  This is pretty important since it helps determine how much fuel the injectors are going to squirt into your engine.  If the new one operates in a different voltage range than your old one, your either going to run very lean, or very rich.  Either way its not going to be pretty. So if you do get a new one, its going to be time to get a ROM tune at the same time.  But Mustangs aren't very common here, so maybe its a bolt-on part.

Patrick

[chickenmanq]

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote </td></tr><tr><td id="QUOTE">Quote: from vancouvers14 on 11<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/wow.gif" border="0" valign="absmiddle" alt=':0'>9 am on Nov. 26, 2001
looking for a stock one (car-part.com) or an upgrade(mustang mafs should work)?
</td></tr></table><span id='postcolor'>


Hey vancouvers14, do you know if the mustang mafs work, or are you guessing? &nbsp;If so, does it retrofit easily?

[vancouvers14]

i've heard of a bunch of 240s with them. &nbsp;i'll try and dig up some more info...

[vancouvers14]

ok, a cobra mustang or a z32 mafs will work, but you will have to re-program the ecu. &nbsp;i'm pretty sure there's no mafs that you can just swap in and out

[chickenmanq]

####! &nbsp;#### ####! &nbsp;Couldn't they just make it easy for once. &nbsp;So to reprogram the ECU, I'm gonna have to take it to someone like Jim Wolf, huh?

[drifterx]

listen to this... i dont have a clamp on my intake and my MAFS and sometimes it falls off and then my car would stall...........
i only had it happened on the highway 1 time and i got to the breakdown lane
i got the clamp now......

[trashcan]

You can take it to JWT, or you can get standalone engine management and reprogram it yourself, It might be expensive, but you if you do a lot of mods to your car (not just header, intake, exhaust) it'll be cheaper than getting it reprogrammed over &amp; over.

Patrick

[ca18Silvia]

MAFs each have a diiferent curve of voltage output to airflow measured. Those that use voltage at all that is.

If you do not know the properties of the MAF you are replacing or the properties of the MAF you are replacing it with you are playing russian roulette with your engine.

The MAF is the ECUs PRIMARY sensor. This is not something to be kludged. Those who do either do not know better or do not have a choice.

[chickenmanq]

Yeah, I kinda got that impression. &nbsp;I can imagine the engine trying to self destruct if it got the wrong signals. &nbsp;I'm guessing an ECU upgrade will change that curve anyway, right? &nbsp;Essentially making a bigger MAF not needed? &nbsp;Thanks for the warning though.

[misnomer]

I don't imagine the MAFS is gonna give you any big speed boost till you get to the point that the factory one hits it's limit. It's simply a sensor, doesn't directly impact the vehicle's performance (untill the air flow is beyond it's range, at least <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/tounge.gif" border="0" valign="absmiddle" alt=':p'>)

[ZeroGS14]

To run the mustang maf you have to have your ecu redone...I know JWT has a setup for that already...Jun can set up your ecu for a z32 maf..but I wouldnt worry about that until you are doing something major..ie...turbo

[ca18Silvia]

The only reason to change is seeing 5.2 volts on the multimeter you have on your MAF signal.

Most of the factory MAFs have a nominal air flow figure which they will top at. The for example Z32 is about 500hp worth.

This is all about the metering range. It has nothing to do with the size of the pipe. :-)

The JDM is full of tuners replacing MAFs with Z32s or R32s. The airflow improvement is only at the very top end. The extended metering range is the usual reason.

Hitting the fuel/airflow cut is not fun and depends on the fuelling and ECU spec of a given model. Your 240 models may have a better ceiling than some others.

My ca18 hits fuel/airflow cut at 9psi. Stock turbo with only minor efficiency improvements.

The Z32 AFM, PUMP, and large injectors are all necessary at this point. The factory cleverly specs all these levels to work out similarly. Once you max out one you are protected by the ECU from going too far wrong.

To change is a matter of altering the ECU parameters for the MAF and to suit the spec of the engine.

JWT as well as many others can do this job for you.