Hi,

I was working on making a custom intake for my 87 GXL and I was wondering if there is any way to bypass the air regulator. It is located right past the air box. Iam putting in 3" piping and it looks very restrictive. What are some possible solutions beside buying a new ecu. Thanks a lot!

none.... new ecu it is



"new ecu" will come with a map sensor.... so you dont need AFM anymore

are you talking about the AFM? Its the silver "box" that the air box bolts to.

Yea, thats the box Im talking about. Thanks for the imput.

yeah as said before that cant be removed with out replacing the ecu to a standalone unit.

Isn't it possible to get less restriction with a S5 AFM?

Will the S5 AFM be compatible with the S4 plug? And would it flow more air?

i beleive it is less of a restriction but doesnt just plug in. You would need to make some sort of addapter or something to make it connect to the stock wiring.

The S5 is more restrictive based on fluid calculations, but it can be mounted in any position.

it is possible to replace the afm with a less restrictive maf but you would need some brains to make it work... as it would require something to convert the signal from the maf to what the afm puts out at the same flow rates. Or maybe at different flow rates, you could make it tunable as a crude form of programmability with the stock ecu, as the stock setup does run it a bit rich.

It seems like a big myth you can't mount the stock S4 AFM in any position..



I didn't notice any difference and I had mine sideways while I was still using an AFM..



Is it really that big a deal?

if anyone is interested in converting their s4 car to a S5 mass air flow sensor , here is the diagram that you need to convert the wiring harness .



Enjoy



https://www.nopistons.com/forums/pub...1047683894.gif https://www.nopistons.com/forums/pub...1047683894.gif







https://www.nopistons.com/forums/ind...showtopic=3067

It may be a little off topic but, I can't see where an ecu upgrade would be a bad idea at all, expensive; maybe. The technology is fast approaching two decades old on the FC models, not that the old ecu's are bad but, imagine pounding away on a commodore 64 w/ a phone modem, old school style. Not necessarily the way I'd like to browse the internet...

brain fart

okay, originally posted this half baked potato in the wrong thread. try again:



split the intake pipe (think Y splitter) and stick the AFM on one leg, and a plain old cone filter on the other leg. reduce the spring preload on the AFM so that the door moves easily, then try your mightiest to get the AFM output to actually represent the amount of air sucked through both the cone and the AFM.



oh, and make sure you're trying this on a NA car https://www.nopistons.com/forums/pub...DIR#>/wink.png

this works, but you have to put a smaller afm in the other side, you have to make the air want to go thru the afm thats plugged in

my idea is to actually have a majority of the air go through the cone, bypassing the AFM, with the AFM just seeing a representative fraction of the total flow. if you're forcing most of the flow through the AFM, it's not much of an improvement https://www.nopistons.com/forums/pub...IR#>/smile.png



i'm thinking in terms of an anology to a parallel resistor setup, but fer sure air aint electrons.