wtf i cant belive i cant find anyone who wants to upgrade thier intake pipe. come on that intake before AFM is tiny. PLEASE can any one help me either tell me a replacement AFM from another car or that is bigger than stock. i wrote this because suprisingly i cant find anything about what or how to upgrade the intake on a 1990 intake system.

 

Im pretty new to Mazda's and their flap door air flow meter. But other cars use hot wire MAF's. You wont be able to convert to another system of reading intake flow without major ecu changes.

A bigger intake might be better, but having your sensor work properly matters more

 

i wnat to replace my AFM r get rid of it if possible (probly not) to a larger diameter to allow more air flow.
MORE IS BETTER
i would think this would be a more popular modification

 

corksport.com rx7 2nd gen section.
nuff said
search button works quite well fyi

peace

 

ebay...but the 3 inch pipe intake for the N/A rx7 works exactly the same except your vac hose is on the bottom. pics in my prof. you keep the MAF too.

 

Check out this thread:

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/help-air-sensor-635318/

Or search for any of the numerous others on the topic.

-Rob

 

what exactly are you trying to do? Make your own intake pipe out of a Honda Intake.

 

an NA doesnt suck in enough air to make a difference. im sure upgrading to a larger AFM would increase slightly but for the money your shelling out.... just put a cone filter on it. a turbo on the other hand would show a decent increase.

 

The stock AFM has good enough air flow, I can assume you aren't even making that much power. You can replace the intake pipe with a larger one, using a bit of ingenuity with a pipe and couplers. If you really want to eliminate the stock AFM, you need to get a full standalone. All depends on your price budget.

 

the intake pipe is what.. 3.5 inches? thats plenty for a 1.3 liter engine. the AFM inlet shows a slight bit of restriction being only about 2x3 inches. you wont notice any difference in upgrading to a 3-3.5 inch AFM unless your turbo or ported maybe.

 

In most cases more is worse.

The upgrade is a standalone EMS with a custom intake pipe, K&N cone filter, and proper ducting or deflectors installed to keep the heat exchanger discharge air away from the engine inlet.

 

so, lets say on a S4 T2, its impossible to remove the AFM ??
so id have to mount my Apexi filter with the adapter to that big *** AFM ???
why did mazda didnt go with a normal MAF instead ?? it really needs the flapper??

if anyone has pictures of their CAI , could you post it here please.

only a standalone would "cure" the fact of running with a removed AFM, or would something like the S-AFC II would do ???

i have a hks pfc f-con & im waiting for my rtek v.2.0
and probably a tuning with steve kan next time he comes in Montreal.

 

How many cars from the 80's do you know of that had a MAF without a flapper? Honestly, how many? All RX7's, Supras, Corollas, etc all had AFM's with a flapper..lets think..maybe it was the current technology??

An AFM is, among other things, a device that calculates how much air you are sucking in, and tells the ECU how much fuel to deliver to the engine. An SAFC2 tricks the ECU into adding extra fuel...can you understand why this WOULDN'T allow you to eliminate the AFM..?

If you want to eliminate the AFM, which should, in all honesty be the last reason why you are doing this, get a standalone EMS.

 

Get an Apexi Power FC~

 

From that comment I guess you're too young to have witnessed the early days of EFI...

 

Just be glad that Mazda did not choose the Bosh D-Jetronic...Variable reluctance MAP sensors....*shudder*

 

(1990 N/A)

so i geuss its not worth upgrading unless i want to waste a good some of money for little power increase.

ill stick to upgrading the ignition and exhaust for now

 

Ditto for the ignition. The FC has an excellent system, and beyond new plugs and leads there's nothing really worth doing.

 

Upgrading the ignition past new wires and plugs is a waste of time too. The ignition system is pretty stout. Especially for NA power levels.


exhaust, either RB downpipe or header plus catback, lose the cat (unless you have an S4) open element air filter with decent shielding, lightened flywheel, and weight reduction are going to net you the best gains without opening the engine to port it.

BC

 

This is before the heat wrap on the tube and custom cold box / heat shield...



I was supposed to send my S4 N/A CPU in to Digitial Tuning today, but I've been too busy...

Think I'll wait untill I fry the current clutch before I do the flywheel, shouldn't take long here in SF...

The only other upgrade that I perceive to be worthwhile on an N/A seems to be the Pineapple Sleeves. Will get around to that eventually. Secondary throttle plate removal seems worthwhile as well.