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you CAN use Apexi S-AFC ALONG with the weapon R intake or any intake (not swift) if you choose to tune your car, check out Apexi website.
You CAN do it yourself, but a dyno run and Wide band 02 sensor is a proper choice for tunning it.
(if you can press your TV remote control, you can change the Apexi unit, it's that easy)

We need to educate ourself on ODBII ECU unit on any 96 or newer car sold in the US.
ODBII ECU WILL counter adjust any of your adjustment/modz ==> to keep the emission level in check.
==> that is the required for all cars sold in the US. (ODBII is not performance friendly)

under WOT, or under ~4000rpm, the car run in CLOSED loop mode (constant sampling the air mixture by the sensors), your car sensors will protect you from wild mods (MAF, O2 and Knock sensors will be in check with each other and keep your car in a safe level) which allow alittle bit of change/gain (tolerance) (showed on dyno chart) when you add intake /exhaust, but not much (does not matter you have Swift ECU or Apexi)

above 4000rpm or WOT, the car run in OPEN loop mode, the car ECU run base on a safe factory fuel curves and your O2 sensor (as a safe guard, feed back mode) only, you will notice this if you have an Air/Fuel display on your car, at WOT, your air/fuel display stays very steady on the rich side.

any change to your car ECU MAF sensor signal will effectively change the fuel curve (up to a point only, limit by your fuel pump rating, injectors, the vacumn control HVAC?? unit on your car) (and these limitation are designed specificly for your car)

So for a force induction car, you need to add better pump and better injector to compensate for this limitation

on your NON supercharged/turbo car, you can only adjust as much to your car limitation (does not matter you are using which aftermarket ECU), and when you do it yourself using the Apexi 02 display to tune, stay on the rich side of the fuel mixture, you will be just fine.


That is not to say the risk is not there when you adjust your car, but as long as you have a non-force induction car, your risk are minimum. There is no guarranty on any aftermarket mod (even just intake or exhaust) when you blown your car. Do NOT think RMM, Swift, Weapon R, Apexi or anyone that sell aftermarket will pay for your engine, if you know anyone that does this, let me know. (even the guy that sell you a radiator hose will tell your that it is not his problem when your car blown up)

I know at least 20ppl that have this unit on their other car (honda) and I have not hear any engine blown problem
I have it on my honda also for 2 years (still have it.)

Use your common sense when you try to tune it yourself, stay on the rich side, if you are not familiar with these thing, i do not recommend it, leave it to the pro. For those that want to play, all I can say is Apexi is a solid Japan built unit, built just for imports car mod.

I do not work for any company mentioned in this post. I am posting from personal experience. And I have not try this unit on the Lexus yet, but I will soon.

to response to bitkahuna questions:
the APexi unit can be install by anyone that work with the car electrical before, if you can install a pair of fog light and wire it up in the car, then you can do it, if not, i don't recommend it. Common mistake, loose wire connection in the installation==> check engine light, check your connections

There is not safe-guard when you use the Apexi unit, so check your O2 reading (built in the unit) when you do the tunning, and stay on the rich side if you want to be safe, Or leave it to someone that know what they are doing.
(common sense, you not gonna just lean your mixture by 30% for no reason, will you? hee hee)

Correct me if I am wrong or say something incorrectly , any ODBII guru out there....
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http://www.mkiv.com/techarticles/afc/

 

I've gotten some real nice bends from a place called Stainless Specialties,in Florida.
The ECU uses several inputs(air mass,air temp,water temp,throttle opening,engine speed,gear selection),in varying percentages to acheive the injection duration.
With an AFC,the signal is "morphed" to give the desired effect,much like a synthesized keyboard does(delay,sustain,defeat).
Those a/f meters,unless they're a nice four-wire,pro unit,are a little tough to read as they fly off the scale,and have only helped me in the idle/cruise mode.
After tuning Weber carbs for twenty years,I just go for it and use common sense;this electronic stuff is neat!
There's a company named SplitSecond that makes AFC units as well,have only four *****,and are fairly simple to use.I believe they sell the meters also.
I have one of these in my old Fiero with a '97,3.4,4cam V6,and it runs very well with a large exhaust,intake.
I tuned that car while chasing some prototype Mustang down I-94 in Dearborn last year,haven't had to change anything since.

 

SCV8!

You're a Fiero engine swapper too, 'eh?

I'm in the process of building my second V8 Fiero right now! I've built a nice 350 with a 383 stroker kit. Holley fuel injection kit, etc. etc.

Do yours yourself? Any other mods? I've got a brake upgrade kit, 944 transmission transverse mounted, all kinds of stuff. I can't wait to get it on the road and roast all the Corvettes and Vipers with it!

SR

 

check out this link: obd II mumbo jumbo

All I can say is Thank God mine is a 1993 and does not have this mumbo jumbo shaka laka stuff.

 

Cmpterwiz,I did the swap myself and drove the car back(a week after doing the swap) to WA state from MI almost exactly a year ago.
The engine has torqued so hard that it has stressed the subframe a little,so I had to brace it up some.
The car is now getting some huge,4 piston BMW 7 series calipers and some Subaru Legacy rotors(correct offset,fit nice onto the register on the hub)that are 11" dia.;there's another option I didn't go for because I only have 16" wheels,and that is the 13" rotors from the SVX model.Did you do the Grand Am upgrade?
My suspension is assembled from a variety of parts,and works nice.I used Cadillac lower balljoints in the front(lowered spindle effect),Moog progressive rate overload springs from a Jetta,Bilsteins from a Toyota truck.In the rear I turned the strut mounts upside down for more travel,used Mazda 626 springs,Bilsteins struts from a Jetta,and a custom 3/4"swaybar.Bridgestone RE71s on some very lightweight 16" wheels help too.The car is only 1-1/2" lower than stock,and I can throw the car around at 100 like a go-cart at 25;love it.

 

all of my suspension and brakes are pre-made kits. I got the stuff from both V8archie.com and www.cybercars.com/fierohq.html

They make an awesome brake upgrade kit for just over $1000 that's all 4 rotors, pads, 4 piston calipers, etc. I can stop in less time than the porsche 968's!

(55mph - 0 in only 97 feet)

You do need 16" or greater wheels with these too tho...

If you're not familiar with those sites, check em out. There's TONS of helpful stuff! And get a copy of the big fiero parts catalog....you can get ANYTHING from there.

SR

 

So,have you found www.fiero.nl?
Ground zero for all mid-engined Pontiac fans.
So just what exactly is the 944 gearbox?

 

914 gearbox, oops, not 944. From the Porsche. You mount it upside down and the such, and it mounts to the V8 with a custom bell adapter. Pretty cool. Rebuilt with upgrade it, it'll take about 650-700hp before it breaks.

SR

 

Hi! I know this is an old posting, but I'm just installing the s-afc now. I have everything hooked up by the manual, but it won't fire up. What exactly is the color for the air flow wire?

 

what year is your car, if it is 96 and newer you are hotwire not karmen

read this:
https://www.clublexus.com/forums/sho...highlight=safc