AFM for our cars that is bigger and will flow more?...

 

no you don't need one.

 

actually you do need one, its a HUGE restriction on the intake air, even on the N/A's. unfortunate there are no aftermarket ones that are larger. the best way is to either build yourself a megasquirt or buy a Microtech to remove the AFM completely.

 

Well when we did magnahelic testing the filter was about half of the total restriction in the intake path from our readings.

 

a microtech?....

 

What you need to remove the AFM is a standalone EMS like a Wolf, Microtech, Haltech, Motec or any of the others.

The AFM must be used if you still have the stock computer.

 

It"s a standalone engine management system.

 

what is a megasquirt, and how could i build one?...

 

www.megasquirt.info

 

can you run a stand alone fuel management, and still use the stock computer for ignition?

 

thats what the megasquirt or SDS standalones are for, stock ignition with stand alone fuel that removes the AFM

 

I thought you could convert it over to a GM hotwire MAF if you wanted?


There are some comverters that they sell on ebay, I know they use them for MKIII supra's, but most guys just go with the Lexus AFM.


Someone should look into that

 

Someone has, with a mustang type hotwire high flow MAF, and it didn't work out. Big waste of time he said and much too hard to do. Mazdaspeed7 was the one trying to do it if you care to look up the past threads.

 

so it won't mess with the stock computer? I'm just a little confused with all this computer stuff.

just to clarify 100%, I could run a megasquirt for the fuel, and still use the stock computer for ignition without any other modifications?

 

<shakes head and looks down at floor...>

The stock computer REQUIRES the air flow meter. It is the BASIS of the fuel injection system. The afm reports air intake to the computer, the computer crossreferences that reading (converted to voltage) with a preset map loaded at the factory (non adjustable) along with air temp (and to a small degree) throttle position and injects fuel based upon that. Without the air flow meter, the ecu is ABSOLUTELY BLIND at any point other than idle.

These other aftermarket computers people are talking about COMPLETELY REPLACE the stock ecu and wiring, most come with their own wiring that you cut to length and install new connectors onto new sensors. They are able to operate just about any engine in any vehicle (or not in a vehicle at all) thus the nickname standalone. They come either with no map whatsoever, or a rough base startup map. From there they must be tuned to even be street driveable by a professional, much less have proper power and fuel delivery.

 

but so could you run a standalone for the fuel, and still use the stock computer for spark?

 

eh...no. That's what the megasquirt does though, and some of the low end haltechs do, they're fuel only. BUt if you get a standalone meant to do both, you should let it do both. It'd be dumb not to.

 

sorry, still a little confused. so if I got a megasquirt thats NOT meant to do both, the stock computer wouldn't work for half? not running the fuel part would screw it up?

what do people run for just spark?

sorry for the thread jack.

 

When we say standalone we're not really talking about a megasquirt. That's a halfass standalone...it's actually a fuel computer, not a standalone at all. IN this case, yes, your stock ecu must be retained to run the ignition side, to my knowledge. I actually have very little knowledge about that setup, Ive never even laid eyes on one and don't want to start now. Bottom line, there isn't much use in messing around. Either stay with the stock control system adn run an afc and a set of injectors with it, or go all out and get the full on haltech/mictrotech standalone fuel/ignition computer. There is very little support for anything else.

 

BTW, finding someone to prof. tune a megasquit will be tough. Even in our city, the local Dynoshop is only certified to tune haltechs. We'd have to tow our vehicle about 350 miles to get a microtech tuned. You better check around to see what dynoshops are available to do what tuning. You might be interested in their prices as well, because it may not be to cheap.

 

For once I agree with 1987rx7guy. The AFM is not a restriction in the least. Only when you get to ungodly power levels does it become an issue...

 

Come on Mr. Cake its been a few times now. Admit it! I need to find a camcorder to use with the magnehelic guage I have and do some vid caps. sucks to be po! yes P O, po!

Santiago

 

i met a guy @ sema who could do the hot wire conversion, let me try to find his name

 

If you want to do a nice conversion to get rid of the AFM, you can get an HKS VPC! VERRRRYYYYY Nice IMO.... It converts it to a speed pressor sensor, or something like that (maybe a MAP sensor.) But the problem is finding one, and then tuning it.....

 

they don't make the VPC anymore