GI: Custom Protege S-AFCII controller
 

I've been toying around with the idea of working on a modified version of the Apeci S-AFCII that will actually work with the protege stock ecu. This of course will allow the end user the ability to adjust their AFR's across the rev range to lean or richen the fuel curve as needed in both light duty and WOT driving. Currently when the protege goes WOT the ecu runs closed loop mode and piggybacks are shut out. I've been working with a friend who is an electrical engineer about this and we think we've got a few good ideas to make this work properly.

Here's what I need to know. What's this worth to you guys? The units retail for about $300+ or so. I would like to see this be sold for $350-400 and provide 10-15whp (based on tuning). In the RX7 community the 2nd gen NA guys swear by the S-AFC and claim 10-25whp are very easy since the car runs so rich.

There is also the S-AFCI which is the older (original) model with only 1 tuning map. I'm not sure if they're still in production at a lesser price or what. The S-AFCII allows multiple maps that are selectable on the fly.

Hmm, interesting.
I think the $350 range sounds reasonable. Protege owners may elevate you to god-status if you can figure a way around our ECUs...
Now stop thinking so much and finish my damn wheels!

about those wheels......I'll have pics of them for yout omorrow hopefully!! woohoo!

i think it'd be well worth it...however, how tunable will it be? would it need to be tuned in someone had cams? would this magical box need to be set-up for different mods or is it strickly how it comes is how it needs to be?

The Super AFC II (Air Flow Converter) is the industry standard for sub computer fuel control. The S-AFC II is designed to fine tune and "squeeze" power out of existing engine setups by allowing the user to modify the fuel curve with precision accuracy. Since the act of simply bolting on performance products does not make maximum horsepower, the S-AFC II allows the user to calibrate the fuel system in accordance with performance upgrades as they are installed. The AFC modifies the air flow meter/ pressure sensor signal voltage going to the factory ECU (Engine Control Unit) to change the amount of fuel injected. The S-AFC II utilizes a VFD (Vacuum Florescent Display) to display critical data in three different modes.

Features for the S-AFC II include:
Newly designed case and user interface, single button menu navigation, 12 point fuel correction in 200 RPM increments, data storage for two different correction maps, password protection, integrated knock monitor, and 4 different display options.

The S-AFC II, while not completely universal, comes preprogrammed with 15 of the most commonly used air flow meter/pressure sensor maps. By setting the AFC to one of these programs, the user is able to adjust injected fuel amounts by +/- 50%. 12 user defined RPM adjustment points allow for fine tuning in 200 RPM increments. Fuel can also be adjusted for part or full throttle situations.

The Deceleration Air Flow Correction cures erratic idle problems for Hot Wire vehicles equipped with an open atmosphere blow off valve. The S-AFC II can also display an incredible amount of data including: Air Flow Capacity (Hotwire and Flap Type only), Engine RPM, Throttle Position, Pressure Sensor voltage, Karmann Frequency, and Air Flow Meter Correction.

The S-AFC II displays data in three different modes: Numerical, Analog, and Graph. Numerical Mode allows the user to monitor up to four different parameters in numbers and also shows peak hold values on demand. The Analog Mode displays up to two values in an easy to read meter style display. Peak Hold is also included in this function. The Graph mode offers real time graph plotting with a Ghost map trace feature built in. The graph can replay movement up to 60 seconds.

CONCEPT:
Piggyback Fuel Computer with 12 correction points in 200 RPM increments.

CHARACTERISTICS:
Modifies air-flow meter signal (pressure signal in some vehicles) to optimize fuel-air ratio; Vacuum Fluorescent Display (VFD).

Hmmm...interesting. Keep me posted.

Well I'm completely lost when it comes to electronics. If I have the mp3 ecu will this work. Or will the mp3 ecu be worthless with this magic box? And last but not least, I think it was asked but I didn't get the answer. Will it come in a plug and play verson? And yes for 10-20hp 350 sounds great.

This will work with ANY protege ECU including MP3 and MSP. Sadly though it will not be plug and play. It will require splicing of several wires. I've never installed one myself but will be picking one up shortly to begine final testing. I'll give you an idea of how difficult the install is. I guess it would be fairly staightforward. If you can wire a car stereo you should be able to do this in an hour or so.

Errr how do you intend to get around the whole closed loop problem.

The only thing I can see is getting a signal interceptor seperatly and using it to change the signal from the O2 sensor, then its gonna be a total crap shoot to tune it. But thats not doing anything about the closed loop thing just getting around it.

I've got the closed loop situaton under control....however I'm not abotu to release how we've done it. Thats like giving away all the R&D!

As all ways, all eyes and ears are on you!

i'd rather have your money instead!! I'm tired of working for free!! hahaha

can you say mid 9's!

"hey my first post in three months!"

I'm still wanting to see what happens on your car when we put some 15" drag radials on there.

this is off topic! but now you have my curiosity ? going. What you got?