jporky99

question number one!

1) what's the difference between a MAF and a VAF?

question number two!

2) Why replace it with one from an RX-7?

thx guys!

mazdaspeedwest

1. Two different types of air flow sensors. MAF - Mass Air Flow is what you'll find on the 2nd and 3rd gen Proteges. It's a small device with an electrode that measures the airflow as it rushes past the electrode.

VAF - Vane Air Flow (flapper style) is a larger device that has a physical door that opens and closes to allow air in and control the amount of air coming in.


2. The RX7 VAF has more flow above 6000rpm, almost a 5hp boost. Although otherwise identical to the stock VAF. It may show more flow below 6000rpm, but no real tests or proof of that has been done, that i know of.

jporky99

interesting. thx for the info. oh, are VAFs still common?

Skullet

i put mine on yesterday, and the car started runnin like ****... also, it IS a physically bigger unit (for the 1st gen...) any ideas why this would be?

Vormav

any ideas why its bigger or why the cars runign like ****? . .
i got no clue why they are bigger.. mayeb the rx-7 needs more air?

but as far as it runing liek ****.. it could be because you havent tuned it correctly.. i know theres a website that one of the members on pclub made that shows you how to correctly do it.. but i forget the url for it.. mayeb sombody else knows it? ...

also what did you pay for yours?

mazdaspeedwest

here ya go

http://www.mazdaracer.com/pro/VAF.htm

FYI: the search function pulled up 2 pages full of VAF posts.

Skullet

as for it bein bigger... lookin at how much the exhaust from a 7 can flow (HUGE turbos), i imagine it does suck quite a bit more air than our 4-bangers... and yeah, found out i had to tune it, but havent done it yet, i just threw my cone adapter on my stock vaf, and did it that way... apparently the only gains u get from the rx7 vaf is an extra 5 hp above 6k... nice, but not much really in the scheme of things... might decide to sell it, not sure yet. as of where i got it, it was included in the price of my car, along wit a ton of other ****... even got a turbo wit it, but it needs a new compressor wheel, and then id have to have it sent out to be put back together... soon, i hope.. lol

Skullet

hehehe... thanx man, i found it after i posted that... was just hopin for a quick reply. plus it gave u reason for another post, right?