Vaf conversion

[JPT]

1994 and '95 are OBD I. '96 and '97 are OBD-II

I wonder just how much work it would take to put that in a Festiva.

[getnpsi]

No way dude, nothing is simple bringing aspire stuff to festivas and vice versa other than their engines brakes suspension etc. It can be done sorta easy (iceracerdude again) but you cannot bring older tech to an aspire and pass inspection in other words. Even though its obd1 it's a 3plug ecu and its not the same as mazdas even. You need to pinout everything. If i WAS converting a 88 or 1989 car to EFI, id actually think about going obd2 that way you can monitor your sensors so much better. I'd not hesitate to look for a 1996 escort donor, the kias and proteges thru 1998. if i had a 90-93 id run away of course because of the simplicity of tried and true swaps laid in stone.

A nasty detour but i think OP just wanted something that the maf people get to use readily and make it work on his vane meter. Hope hes got his question answered and has ideas on what to go look for.

[getnpsi]

JPT - I might be stuck buying a carby festiva because i just cant find quality efi's out here. they don't have rust i admit but they...they are just yucky LOL

if this is what i do ill go the obd-2 route and lay it out in the garage for sure. A lot of people do it overseas, the KIADOHC guy comes to mind.

[festyfreak39]

ive seen it done on postman's and iceracer dudes cars too,


Sorry to hijack the thread but why exactly and how did you do it if any of these guys are posting here..

it looks like it would flow alot nicer then the stock fugly box and probably do alot better with boost?

[getnpsi]

The b6t and BPs still use a vaf and they get all kinds of air thru them. MAFs are just newer tech and nicer looking. Some people get megasquirt and eliminate all of it and run off Manifold pressure alone, but this won't pass visual emissions.

[festyfreak39]

The b6t and BPs still use a vaf and they get all kinds of air thru them. MAFs are just newer tech and nicer looking. Some people get megasquirt and eliminate all of it and run off Manifold pressure alone, but this won't pass visual emissions.

i have no doubt they get all kinds of air though them but i thought running a MAF over a VAF also meant you could run an open atmosphere BOV rather then a recirc? i hate the vaf technology too it just seems so ghetto VW style.

I know miata guys swap the rx7 vaf onto their miatas and gain a couple hp, im wondering with a MAF conversion it might be the same?

[91_festy_Gl]

i have no doubt they get all kinds of air though them but i thought running a MAF over a VAF also meant you could run an open atmosphere BOV rather then a recirc? i hate the vaf technology too it just seems so ghetto VW style.

I know miata guys swap the rx7 vaf onto their miatas and gain a couple hp, im wondering with a MAF conversion it might be the same?

Not true. DSM's run MAF and it is required to have the BOV recirculated. If its not recirculated then the MAF is accounting for air thats isn't there which will cause the engine to run rich. Bout the only real logical way to get by with a atmosphere blow off would be with a stand alone or a MAP. MAP's read air pressure in the plenium insted of reading air outside the engine just like VAF's and MAF's do. Blowing off into the atmosphere with a MAF can be used but will lack throttle response because of the rich condition. I persoanlly think that VAF's are old and out of date. Sure they flow air but the flapper itself slows the direct flow of air entering the engine. MAP's can't be fooled because its reading air pressure that has already entered the engine. Actually MAF's are somewhat out of date aswell.

Gosh my brain hurts now.

[91_festy_Gl]

If we could convert to a map that would be way better for blowing off to the atmosphere and installing a straight pipe CAI.

[Rocketman]

MAF suffers the same thing a VAF does.

The B6T guys vent BOV's on the VAF and we have no issue, not even with throttle response. My wideband reads rich for a fraction of a second, if that, when the BOV cracks.

There is no MAF conversion for the B6T like there are for other cars. Someone on the AMAZD forum came up with a conversion using a GM MAF but it was pretty complicated & im pretty sure it fell through.

Your best bet, if you want to ditch the VAF: go standalone.
Converting to a newer style ECU & harness may work, but that seems like a lot of work to be still stuck with OEM management

The VAF is pretty darn flexible from a modding standpoint, go talk to the folks that run Alpha-N systems that have to have their ECU tuned for adding a CAI. Its very adaptive, air comes in, proper amount of fuel goes out. (to an extent)

[blitzbuggy]

so does the one in the link
fit the b3 box?

[Tommychu]

The b6t and BPs still use a vaf and they get all kinds of air thru them. MAFs are just newer tech and nicer looking. Some people get megasquirt and eliminate all of it and run off Manifold pressure alone, but this won't pass visual emissions.

Never mind the other B series motors; the Toyota 7M, RX7s, several bimers, and a few other air-hungry engines used VAFs without a hitch. The only thing wrong with them is the idea of your intake air being 'blocked' by a spring-loaded door (and the damping chamber behind it), which would seem to the layman to be a hindrance. However it is only a small restriction when you take into account the force of the engine's vacuum.

Show me a MAF system (or a carb for that matter) where you can adjust your mixture across the board with 5 minutes, a butter knife and a couple of screwdrivers.