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often when i see the inside of a tuned car, including many IS's, there are two apexi devices with blue screens. one, i know, is the s-afr. the other is a afc? what the hell is an afc?? and what is the difference between the s-afr and the s-afr II???

thanks...
 

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the apexi devices with the blue screens that you see in the modded IS’s are two of four units:

s-afc (air fuel converter)
The second-generation S-AFC is a fuel computer that adjusts fuel/air ratio by modifying the air-flow meter/MAP sensor signal. The S-AFC features a user-definable, eight-point, adjustable fuel curve that can be set in 500 RPM increments. The range of fuel adjustment is +/- 50% at each of the user-defined setting points....
read the rest @
http://www.apexi-usa.com/electronics_safc.asp

s-afc II (air fuel converter)
The SUPER AFC II is a vehicle specific fuel computer that modifies the air flow meter / pressure sensor signal and allows the user to either enrich or lean out the fuel mixture. Adjustment ranges from +/- 50%. It now boasts a 12 point adjustable fuel curve with 200rpm increment setting points. The Super AFC II allows the user to protect settings using the password option...
read the rest @
http://www.importscene.com.au/prod458.htm

avc-r
The Super AVC-R is the premium closed-loop electronic boost controller on the market. The AVC-R allows flexible control over virtually every aspect of boost control and adds new innovative functions such as injector pulse monitoring and gear specific boost control. Some key functions include: RPM-based boost and solenoid duty cycle control, scramble boost, self learning mode, 2D ghost map trace mode, analog display mode, real time replay and peak hold data modes. The AVC-R utilizes an ultra-fast microprocessor and a high quality solenoid valve to control boost. The result is ultra-fast response and accurate, stable boost control.
http://www.apexi-usa.com/electronics_savcr.asp


rsm (rev/speed meter)
Like the original, the new Rev/Speed Meter GP is a complete multi function measuring device designed to measure and monitor data such as vehicle speed, engine RPM, and elapsed times...
read the rest @
http://www.apexi-usa.com/meters_revspeedmeter.asp

*** back to you post.
To answer you question on which to apexi units people have in their “is”, it would depend on their motor modification.

n/a (most likely):
1. s-afc or s-afcII
2. rsm

f/I (most likely):
1. s-afc or s-afcII
2. avc-r

The s-afr that you speak of is actually a hks product. It is similar in function to the apexi’s s-afc line of products. It’s specs are as follows:

s-afr
The HKS Super AFR is the very first airflow meter correctional device in the industry with a built in CPU. The advantage of having a built in CPU is that instead of making corrections to the airflow meter voltage/map sensor, the characteristics of the airflow meter/map sensor is inputted in the CPU so it can calculate the most accurate amount of air flow. Since the correction will be made to this specific intake volume, the correction ratio of fuel will be precise and proportionally correct. With an illuminated digital display and face mounted adjustment controls, the compact Super AFR is a simple to use fuel computer that offers many of the advanced features that were once exclusive to full engine management systems. The L.E.D screen is utilized to digitally display all adjustments as they are entered along with RPM and fuel % adjustment (over baseline) in real time. The Super AFR is compatible with virtually any fuel-injected vehicle, 12Volt, 2-12 cylinder vehicle that utilizes a hot wire, Karmen Vortex, airflow meter or pressure sensor. The internal CPU allows it to be versatile and utilized on many of the newer type airflow meters.
The air/fuel Ratio Correction function of Super AFR allows complete fuel curve tuning by offering eleven points between 650 and 8000 RPM of adjustment, that can be arbitrarily moved in 50 RPM increments. Each point of adjustment offers a tuning range of 50% rich to 50% lean of the factory baseline setting in 1% increments....
read the rest @
http://www.hksusa.com/products/?id=811


I hope this answers you questions.
 

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sasquatchIS said:
the apexi devices with the blue screens that you see in the modded IS’s are two of four units:

s-afc (air fuel converter)
The second-generation S-AFC is a fuel computer that adjusts fuel/air ratio by modifying the air-flow meter/MAP sensor signal. The S-AFC features a user-definable, eight-point, adjustable fuel curve that can be set in 500 RPM increments. The range of fuel adjustment is +/- 50% at each of the user-defined setting points....
read the rest @
http://www.apexi-usa.com/electronics_safc.asp

s-afc II (air fuel converter)
The SUPER AFC II is a vehicle specific fuel computer that modifies the air flow meter / pressure sensor signal and allows the user to either enrich or lean out the fuel mixture. Adjustment ranges from +/- 50%. It now boasts a 12 point adjustable fuel curve with 200rpm increment setting points. The Super AFC II allows the user to protect settings using the password option...
read the rest @
http://www.importscene.com.au/prod458.htm

avc-r
The Super AVC-R is the premium closed-loop electronic boost controller on the market. The AVC-R allows flexible control over virtually every aspect of boost control and adds new innovative functions such as injector pulse monitoring and gear specific boost control. Some key functions include: RPM-based boost and solenoid duty cycle control, scramble boost, self learning mode, 2D ghost map trace mode, analog display mode, real time replay and peak hold data modes. The AVC-R utilizes an ultra-fast microprocessor and a high quality solenoid valve to control boost. The result is ultra-fast response and accurate, stable boost control.
http://www.apexi-usa.com/electronics_savcr.asp


rsm (rev/speed meter)
Like the original, the new Rev/Speed Meter GP is a complete multi function measuring device designed to measure and monitor data such as vehicle speed, engine RPM, and elapsed times...
read the rest @
http://www.apexi-usa.com/meters_revspeedmeter.asp

*** back to you post.
To answer you question on which to apexi units people have in their “is”, it would depend on their motor modification.

n/a (most likely):
1. s-afc or s-afcII
2. rsm

f/I (most likely):
1. s-afc or s-afcII
2. avc-r

The s-afr that you speak of is actually a hks product. It is similar in function to the apexi’s s-afc line of products. It’s specs are as follows:

s-afr
The HKS Super AFR is the very first airflow meter correctional device in the industry with a built in CPU. The advantage of having a built in CPU is that instead of making corrections to the airflow meter voltage/map sensor, the characteristics of the airflow meter/map sensor is inputted in the CPU so it can calculate the most accurate amount of air flow. Since the correction will be made to this specific intake volume, the correction ratio of fuel will be precise and proportionally correct. With an illuminated digital display and face mounted adjustment controls, the compact Super AFR is a simple to use fuel computer that offers many of the advanced features that were once exclusive to full engine management systems. The L.E.D screen is utilized to digitally display all adjustments as they are entered along with RPM and fuel % adjustment (over baseline) in real time. The Super AFR is compatible with virtually any fuel-injected vehicle, 12Volt, 2-12 cylinder vehicle that utilizes a hot wire, Karmen Vortex, airflow meter or pressure sensor. The internal CPU allows it to be versatile and utilized on many of the newer type airflow meters.
The air/fuel Ratio Correction function of Super AFR allows complete fuel curve tuning by offering eleven points between 650 and 8000 RPM of adjustment, that can be arbitrarily moved in 50 RPM increments. Each point of adjustment offers a tuning range of 50% rich to 50% lean of the factory baseline setting in 1% increments....
read the rest @
http://www.hksusa.com/products/?id=811


I hope this answers you questions.
That's a damn good answer
 

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wow.. thanx, i've been wondering the same thing. :D
 

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thanks, :)
one more tid-bit of info. i have read searching on the i-net that the s-afc/(II) air flow converter is only good for turbo setups using up to 440cc injectors. so if your running 440cc's or higher you should have a separate fuel management system.
i don't have a turbo or major knowledge of turbo systems, so i would suggest researching this if anyone is planning on using the s-afc on their own custom self-made turbo setup.

"Some one with more knowledge on this, please correct me if i am misinformed!!!"

figured i should add this since i mentioned that f/i cars use the s-afc/(II).
sorry, i can't remember the soucre of this information, or i would of linked it in.
 

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sasquatchIS said:
thanks, :)
one more tid-bit of info. i have read searching on the i-net that the s-afc/(II) air flow converter is only good for turbo setups using up to 440cc injectors. so if your running 440cc's or higher you should have a separate fuel management system.
i don't have a turbo or major knowledge of turbo systems, so i would suggest researching this if anyone is planning on using the s-afc on their own custom self-made turbo setup.

"Some one with more knowledge on this, please correct me if i am misinformed!!!"

figured i should add this since i mentioned that f/i cars use the s-afc/(II).
sorry, i can't remember the soucre of this information, or i would of linked it in.
Well, not many people with IS' and turbo setups use these for turbo applications using bigger injectors anymore. I remember that the XS kit a long time ago has about 450rwhp using only the s-afc for engine management! (I believe :oops: ) Most people have a piggy-back or stand alone unit for engine and a/f management
 

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well i don't like leaving my source up in the air. so i did some quick seaching and i found the link.

http://forums.nasioc.com/forums/showthread/t-377113.html

and it corrects me 550cc? well the source is an other fourm, and i don't know how creditable it is... so again just something to question.

but i'm with degoIS, if your pushing out serious power you'll have your own engine management system.
 
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