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apexi s-afc

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Old Nov 1, 2011 | 07:58 PM
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Question apexi s-afc

are super air flow converter worth anything i was replacing some parts behind the radio and i found one and it was hooked up and i took it off i dont know what it is and it was a hack job hook up and i want to sell it but i dont know if it is even worth messing with. if anyone knows anything about it let me know what it is thanks
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Old Nov 1, 2011 | 08:14 PM
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They're stupid and pointless. There's a plethora of info about them all across the internet, so use the google wisely.

I had one, but I got better.
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Old Nov 1, 2011 | 08:20 PM
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S-afc

^Ok, that's a bit over generalized.

And it's Super Air Flow Controller if that's indeed what you have.

Super AFC's have decent value for tuning in a few more hp's on NA's.

Super AFC's have some value on TII's if primarily running stock boost.

Surf the Classified on this web site and you'll see what they go for.

I suggest you post a picture so commentors have a better idea what you have.
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Old Nov 1, 2011 | 08:37 PM
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Ok.... I have to at least admit it looked cool mounted on the dash for those fortunate enough to get a ride from me


But aside from that, I have a hard time believing it did any good whatsoever for my car, either NA or turbo. I bought it YEARS ago for my convertible before swapping it, and it really didn't do anything noticeable for me. I could lean the idle out a little so it wouldn't smell as bad, but as far as power went, the gains were not noticeable.

After swapping the TII engine in, I installed a Walbro 255lph fuel pump, 3" exhaust, and 720cc secondaries. Unfortunately, even with that little bit of modding, it didn't do much for me again, so I ended up saving my pennies and building myself a megasquirt standalone.

An SAFC can go for about $150 still.
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Old Nov 1, 2011 | 08:59 PM
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Originally Posted by HOZZMANRX7
And it's Super Air Flow Controller if that's indeed what you have.
I suggest you post a picture so commentors have a better idea what you have.
Errr.. No, it is converter: http://www.apexi-usa.com/manuals/ele...fc2_manual.pdf

Anyway, as for the usefulness of the device.. I've used it very successfully to lean out my S4 NA. My average fuel economy is up to 22MPG and I'm getting ~300miles before my fuel light comes on.

For turbo cars I've been told to NEVER use one.. But some people do and seem to have reasonable success.

I'd say try using it for a while.. Switch the TPS wire over to the pressure sensor wire so you'll have an actual load to control it with, and then try this: -15% Lo thr from 1000-3600 for S4 NA with the thr-point at 75%
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Old Nov 1, 2011 | 10:00 PM
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They're not completely useless. They get the job done on old cars with minor modifications. Newer computers are too smart.

One of the biggest limitations is that you are "tricking" the ECU into thinking more or less air is entering the engine. You can't actually change the maps inside. You have very little control over ignition timing and that limits their effectiveness.
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Old Nov 2, 2011 | 01:02 AM
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Originally Posted by arghx
They're not completely useless. They get the job done on old cars with minor modifications. Newer computers are too smart.

One of the biggest limitations is that you are "tricking" the ECU into thinking more or less air is entering the engine. You can't actually change the maps inside. You have very little control over ignition timing and that limits their effectiveness.
Which is why it isn't all that great for TII's unless you're running stock boost levels. Higher boost, timing becomes more of an issue.

And, I stand corrected controller vs converter. Converter never made sense to me since it doesnt' convert as much as it controls air/fuel mixture.
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Old Nov 2, 2011 | 06:57 AM
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It "converts" the airflow meter signal to something more/less based on user inputs. Hence "air-flow converter"
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Old Nov 3, 2011 | 09:22 AM
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GARBAGE. Guy that I bought my 7 from gave it to me, I tossed it. Bought an rtek sold it then bought a PFC
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Old Nov 3, 2011 | 05:02 PM
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Originally Posted by AmT_T
GARBAGE. Guy that I bought my 7 from gave it to me, I tossed it. Bought an rtek sold it then bought a PFC
I hope you don't mean that you threw it away...
"Never burn money."

I was just up at Pineapple Racing an hour or two ago and Rob said that an SAFC is good for a few HP.

Certainly an Rtek 2.0 is a huge improvement, but for an NA I'm not sure it's worth the price difference..
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Old Nov 3, 2011 | 05:20 PM
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Originally Posted by Derekcat
I hope you don't mean that you threw it away...
"Never burn money."

I was just up at Pineapple Racing an hour or two ago and Rob said that an SAFC is good for a few HP.

Certainly an Rtek 2.0 is a huge improvement, but for an NA I'm not sure it's worth the price difference..
I didn't really "throw it away" I gave it away at a steal.
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Old Nov 3, 2011 | 05:35 PM
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From: aurora, indiana
air flow

apexi s-afc-air-flow.jpgok this is what i have. i hope i did this right so you can see it now thanks for everones help with this thing i am just going to sell it for cheap i really dont want to mess with it again thanks
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Old Nov 3, 2011 | 05:36 PM
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I have an S4 with S5 TII swap
750 secondaries
20b Cosmo fuel pump
Rtek 1.7
Open exhaust
Stock boost

Just got a SAFC II, should I put it on or sell it for what I bought it for? Will it benefit me in any way?
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Old Nov 3, 2011 | 07:52 PM
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^Since only running stock boost, maybe. But the open exhaust by itself suggest you're probably running higher than "Stock" boost, so I wouldn't.

"Converts" (the means) the signal so you can "Control" (the purpose) the air/fuel mixture.

So if Apexi were in charge, I guess the TII's would have been called Air Pump II's.
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Old Nov 3, 2011 | 09:15 PM
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SAFC's have thier place, especially the N/A guys. They can lean the car out and find some ponies. I personally hate them but if you want mild HP gains on a TII or N/A and dont want to commit to the standalone, its a useful tool.
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