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Old 02-07-2005, 02:38 PM   #1 (permalink)
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Question Will Apexi S-AFC work with VVT-(L)i

Will the Apexi S-AFC fuel controller work on the new VVT-i or VVTL-i Engines to adjust air fuel mixtures?

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Old 02-07-2005, 07:02 PM   #2 (permalink)
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I don't see why not?
VVT-I and VVTL-I don't control anything similar to what the S-AFC II do.

Let me explain:
VVT-I and VVTL-I affect valve timing, while an S-AFC II intercepts your intake sensor's signal and modified it appropriately so the car is tricked to thinking air is denser or sparser than it really is, which in turn, the stock ECU adjusts the amount of fuel it gives to adjust the a/f ratio.

I hope this helps.
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Old 02-07-2005, 08:30 PM   #3 (permalink)
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Are you asking if they can be used to control the VVTL-i engagement points?
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Old 02-08-2005, 09:30 AM   #4 (permalink)
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No, I was just curious as to weather it would still work becuase I know that our VVT systems are picky. But I think that I will order one in for a customer. I found that you can stick the 2ZZ injectors into the 1MZ and then if you increase your air relative to your gas you will obviously make huge performance gains and can set it back to its orrigional setting when you are heading home from the track.

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Old 02-08-2005, 09:40 AM   #5 (permalink)
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vafc would be better, it has larger maps so theres more control points throughout the rpm band. and its made for variable vale timing systems i know it says its for vtec but it works.
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Old 02-08-2005, 09:49 AM   #6 (permalink)
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and you know this for sure? I think i will contact APEXi to see what they have to say about it
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Old 02-08-2005, 10:00 AM   #7 (permalink)
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I doubt letheal is right (no offense), but vtec is different from VVT(L)-I in the respect that VVT-I does not use any static engagement point, where-as vtec does. I've also never heard of the v-afc having more control points, although I've never researched it.
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Old 02-08-2005, 10:05 AM   #8 (permalink)
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vvti already has the ability to do what the vafc can do, so what would be the point in even attempting to install the vafc on a vvti equipped car? also the safc will work physically and even on the screen it will look like it works, but since its a piggyback, the ecu will eventually remap the fuel anyways so there is technically no difference, therefore you should just spend the extra $150 and get the Greddy E-Manage.
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Old 02-08-2005, 10:09 AM   #9 (permalink)
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They're talking VVTi-L not VVTi.
He's trying to use VAFC to control/change engagemnt point of the Lift.
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Old 02-08-2005, 10:18 AM   #10 (permalink)
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Quote:
Originally Posted by phozenstone
vvti already has the ability to do what the vafc can do, so what would be the point in even attempting to install the vafc on a vvti equipped car? also the safc will work physically and even on the screen it will look like it works, but since its a piggyback, the ecu will eventually remap the fuel anyways so there is technically no difference, therefore you should just spend the extra $150 and get the Greddy E-Manage.
I don't think you're understanding the way an ECU works correctly in relation to a piggyback fuel computer.

What will happen is the S-AFC intercepts the airflow/pressure/karman signal and then makes an adjusment (what you select) to make the ECU see air as being denser or sparser than it truly is. This makes the ECU add or retract fuel from the car, which will lean or richen the a/f ratio.
The car tries to keep a set a/f ratio, however when you give it false readings, it then makes false corrections. This is the way a piggyback works. You fake the ECU out. It's similar to running the car on a hot day and the car using less gas (because air is sparser), while on a colder day, the car will use more gas (air is denser). The only exception being, the air remains unchanged but the signal changes. Thus more fuel is added or subtracted with no difference in air volume.
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Old 02-08-2005, 10:36 AM   #11 (permalink)
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Quote:
Originally Posted by Pineapple
They're talking VVTi-L not VVTi.
He's trying to use VAFC to control/change engagemnt point of the Lift.
No What we are doing is trying to gain more power out of the 1MZ-FE in a 2dr Echo Sedan. The 2ZZ injectors will work but when you put them in it runs extremely ritch so it needs to be leaned out and the air/fuel mixture modified. So I am looking for a program that can modify the air/fuel ratio W/O a laptop....Which is why the E-mannage system will not work. If this was the case I would purchase a system out of Japan that can modify everything including the VVT and the L on the 2ZZ.
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Old 02-08-2005, 10:52 AM   #12 (permalink)
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That's what letheal was comparing: VTEC and VVTiL.
Some said Toyota ECU will "unlearn" whatever you set with the SAFC.
I don't remember the range in SAFC maybe 15 or 30% max adjust. If your fuel "overflow" is within that range, it'll work. Then changing intake air amount will also change timing too.
How much more fuel you need? Maybe just up fuel pressure and fine tune with SAFC?
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Old 02-08-2005, 11:09 AM   #13 (permalink)
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S-AFC II (not sure about the original) is rated to 50% fuel adjustment.
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Old 02-08-2005, 11:12 AM   #14 (permalink)
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Well what we are going to try first is tuning the stock ystem with the safc and once we have reached the limits of our fuel system we will then upgrade the injectors and see where we go.

I really wish that he wanted to use a laptop for tuning, it would make things a lot easyer.....but i guess that that is not going to work.
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Old 02-08-2005, 11:24 AM   #15 (permalink)
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I see. How much to build a Mega Squrit? Maybe cheaper then SAFC
Oh well customer always right and stupid
Any tips on how to setup and tune SAFC? I got one in my Celica and wanna see if I can tune it myself.
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