I just bought a FC S5. I want to install my Weapon R Filter (4"). But it is kind of hard since the maf on my fc is smaller compare to the s4. If i was to change the S5 MAF for a S4 MAF will that mess up my 13b?

 

wont work....

 

What do you mean it won't work?

 

its like asking your ecu to search the web...... it just wasnt designed to operate a flapper type mass air flow sensor! the maf's are completely different, hence, they register information differently! just purchase the right intake for your car, and problem solved!

 

Adapter plate.

Edit: To be more precise, get an adapter plate to bolt on your S5 AFM with a 4" OD to fit your new intake.

 

It could work with the appropriate wiring changes and device like the S-AFC to adjust the signal.

However, it's far easier to just get the filter adapter. You can get them on eBay, from any of the vendors, or from the wreckers (look at late '80s BMWs). Many cars use the Bosch L-Jetronic EFI system like our cars and thus use a similar AFM. On a lot of cars you find that they have installed an adapter from the factory to connect the AFM to a round intake tube.

 

vipers

you are WRONG
and it will work if he change afm.

 

^maybe so but cake is right about it being easier just to get or make an adaptor. besides, wouldn't that be a step backwards? the flapper style AFM is possibly the most restrictive/turbulent component in a s4 intake setup from what i've heard. the sliding cone style allows more air to pass more smoothly.

 

It's not.

Not true. The cone style was designed and used because it was cheaper for Mazda to produce. It actually will flow LESS air then the flapper.

 

I've read before about a write up/picture on converting a S4 car to an S5 AFM. I do not if its true or not.

 

interesting... i guess i've just heard so many people saying this that it was pounded into my head. it makes sense from an aesthetic view though... you would think a cone would let more air by than a big flopping piece of aluminum.

 

People say a lot of things. Apparently you can't turbo an NA.

 

all he asked was if he changed ONLY the mafs....would it work........ the answer is NO! so i wasnt wrong...... i just didnt waste my time going into all the hassle for a stupid "my filter doesnt fit" question!

 

you still stand wrong

he asked if changing afm would mess his car up
it wont
and you said it wont work
you were wrong

and then you were wrong again in the second post

 

bastard .... i hate being wrong!

but i still think it would be a complete waste of time! all of that for a damn filter...sheesh

 

Yes, huge waste of time and money for a filter. A $20 adapter vs. several hundred dollars of piggyback + tuning...

 

Well, this what i have done. I remove my stock intake filter box, i went a bought a 4" to 3" rubber coupling. I put my Weapon R intake (4") to the coupling and from the coupling into the S5 MAF. So should i worry??

 

That should be fine.