apexi s-afc
11-01-11, 07:58 PM
#1
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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
11-01-11, 08:20 PM
#3
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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.
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.
11-01-11, 08:37 PM
#4
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.
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.
11-01-11, 08:59 PM
#5
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%
11-01-11, 10:00 PM
#6
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.
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.
11-02-11, 01:02 AM
#7
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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.
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.
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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11-03-11, 05:02 PM
#10
"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..
11-03-11, 05:20 PM
#11
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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..
"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..
11-03-11, 05:35 PM
#12
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air flow
ok 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
11-03-11, 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.
"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.
