peacekeeper

Just wondering because I'm getting another FC SOON and its N/A. Just wondering what evryone did before they got the s-afc. I was thinking of getting it first that way I have it when I decide to mod the car. What do ya think?
Charles

seventhgear

remove weight a/c p/s and a/p and its components.. ie straight pipe or gutted cats n e ways and wire open 5 & 6th ports bigger exhaust pipes maybe 2.5' and mufflers what yall think ?

Ziggy682

You'll definately need the S-AFC when you reroute your airpump. You'll need some way to tune your fuel for all that extra air you'll be pumping.



Hehe, just giving you a hard time. Don't take me seriously. Everyone just got way too serious on that other thread.

fc3s.org

You really don't need one until you modify your fuel system, or you are wanting to extract the last 2-5hp on a wide band on a dyno after you have done all possible mods. It is just used to tune your fuel injection (or trick the ECU on your AFM reading more specifically) so unless you are running way too rich, or way too lean and get bigger injectors, use the cash for other things.

fastrotaries

Dave is right, it should be one of the last things you do to get the most out of your motor. However, that's only if you don't plan any power adders and will keep it all motor.

Ryde _Or_Die

Well I say if you will be heavily modding the car enough to ever need one, and you have the funds now-get it. I mean you can save some gas now because more than likely you are running rich and its nice to have the option of controlling your fuel system. I wish I woulda gotten one when I have some cash. Guess that will have to wait a little longer.

T2 Tsunami

iTrader: (3)

So let's go with DP, HKS Intake, CB, and the possible addition of an FD fuel pump. Would I need an s-afc...I have'nt installed a boost gauge yet so I'm not sure where I'm at. Would the s-afc at least help me with my low idle(engine kill w/ AC on)?.

jspecracer7

With the FD pump, then yes, you will want the S-AFC to help re-tune your setup.

peacekeeper

would it hurt to put one in and have it for when I start moding the car? as like a trouble shooter?
Charles

Bambam7

I hate to dissagree with people, (especially Dave!) but I to give my 2 cents here.
You don't need to touch the fuel system to necessitate having the S-AFC at all.
First off, even a bone stock N/A will benefit SLIGHTLY from having the S-AFC, but not $300 worth.
All FC's run overly rich in the midrange- probably a Mazda trick to increase the life of the engine (bet they forgot about carbon lock!!)
Secondly, the more mods you run, the richer the ECU will run. It's understandably not really calibrated perfectly to run higher than stock airflow levels. It's as if for every 5% you increase airflow, the ECU increases fuel by 8%. This of couse, is just an example, I have no idea about the actual increase.
This leads to richer and richer mixtures, so you will not be getting the optimum increase form your mods.
A ported car with full exhaust and intake will need to be leaned out by about 9% at 5000 rpms for max power!
While a stock car might only need 4%. EVERY car seems to be different though- these figures are just a generalization.
Mazda electrics sometimes are very funky on older cars....

It is also a usefull tool for a modified fuel system, to detune larger injectors, or compensate for higher rail pressure.

IMO, if you have the money, the S-AFC is an asbsolute must for people with well tweaked N/A's. You can gain up to 10-20 HP through the midrange, and 5-10 peak near redline, it will make your powerband much broader and smoother.
It will also increase your mileage by anywhere from 5-10%!

It, of course, is useless (and VERY dangerous) without a way to tune it. You can do a VERY rough job with the stock O2 sensor- but I didn't just say that because it's like trying to steer your car with elastic bands. I recomend getting it dyno tuned with a wideband o2 so you don't pop your engine!!

peacekeeper

Thanks Bambam7 thats what I was wondering.
Charles