rob.dren.1981

any one know what maf to use on a 96 wrx to stop it maxing out when reaching this bhp figure?

gotmashed

i was told the get a 300zx maf but there hard to come by and the 200 boys are snaping them up

AndrewC

Yep as discussed only this morning: https://www.scoobynet.com/6425235-post9.html

Andrew...

Tidgy

when you reach that figure you need to be running aftermarket management, which most do away with maf, so wont need to worry about it

AndrewC

Perhaps he already has a remapped OEM ECU?

Tidgy

its prob very near or might be more than a standard ecu can handel, no enough perameters in the ecu to allow for such high power.

can't remember exactly what they say is safe to run on the standard ecu

sc00bylee

So how does this work?? does it it run on more than 5v??

its pysicaly the same size.

So how does Andy F have Apexi management with no maf??

Neilo

because the Apexi ECU has the ability to operate via the MAP sensor instead for its inputs.

sc00bylee

Ahhhhhh, cheers for that, Im running power FC on mine and didnt know that, is it a big job to bin the maf on this system then?

Neilo

absolutely no idea as i still have an oem ecu

Im sure someone will be along shortly to say though

Tidgy

as far as i;m aware if your running the apexi you wont be using the maf anyway? or does it need setting up specialy to do so (not entirely clear on this but intersted to know for future referance)

Neilo

think it can run on both so would presume it would need mapping to suit whichever set up.

Tidgy

ahhh righto, def get rid of the maf i think if i had it, or does map have its drawbacks as well?

AndrewC

Wow - there's a lot of mis-information floating about in this thread

There is no Subaru version of the PowerFC that can natively operate without a MAF signal (there is a D-Jetro PowerFC but not for Subaru), it is possible to simulate a MAF signal from other sensors (MAP, RPM, TPS) and feed that to the ECU using the MAFSIM, however, this is somewhat of a last resort for installations where a MAF cannot be used.

Also, there is no reason why a suitably remapped std ECU can't perform aswell as an aftermarket ECU upto and beyond 400bhp, the only problem on the early cars is the complexity of mapping the ECU.

Andrew...

Tidgy

i thought you got problems from adjustment and sensor input limits on standard ecu's?

AndrewC

The 300ZX MAF still tops out at just over 5v, but the electronics are setup slightly differently so that 5v represents a much higher airflow than 5v on the Subaru MAF.

It is physically the same plastic moulding.

Andy is the sole UK commercial mapper supplying and fitting the MAFSIM for the PowerFC.

Andrew...

sc00bylee

Looks like i will be keeping the MAF then!!

Cheers,

So how does the 300ZX one work better, my standard unit is giving 5.1v readings on the commander so is this about maxed out?

sc00bylee

You beat me to it Andrew.

Cheers for the reply!!

MartynJ

You can buy an STi v4 maf from the main dealers for around £190 new...Just requires rewiring...

sc00bylee

Would the STI V4 maf require rescalling?

Part no anyone?

AndrewC

Yes it does need a rescale and it will also need some work on your inlet tract as it is a much bigger housing than the early MAF.

Andrew...