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VAFC setting w/ stock injectors

Old 08-13-2003, 01:14 AM
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Default VAFC setting w/ stock injectors

I received and installed a VAFC today.
How should the settings be with stock injectors? (I haven't gotten my 450cc injectors yet.)
The pinned post seems to have everyone running 450's with one N/A car. Same with older V/SAFC posts.
TIA

D16Z6
TE05
6psi
msd 6a
msd btm
whiterice is offline  
Old 08-13-2003, 01:36 AM
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Default Re:VAFC setting w/ stock injectors

I would set it to zero across the board and run N/A. The afc leans your injectors out so I don't think it would help you out much with stock injectors. I would just wait until you have the 450's to boost. I haven't read much about running the afc with stock injectors though so maybe somebody else has some info about it.
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Old 08-13-2003, 01:47 AM
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Default Re:VAFC setting w/ stock injectors

I was already boosting with a missing link and rising rate regulator *cough*crap*cough*. Removed those after vafc install.
I'm not about to remove the turbo setup and wait for 450's.
It has been posted that stock injectors are good for up to 7psi. So they should do with my setup. Just need vafc settings.
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Old 08-13-2003, 01:58 AM
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Default Re:VAFC setting w/ stock injectors

I am pretty sure the afc doesn't add fuel though it just leans the injectors out. You will need something to add fuel... that's what I meant.
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Old 08-13-2003, 07:58 AM
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Default Re:VAFC setting w/ stock injectors

AFC's do -10% -20% can't u do +30% ?
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Old 08-13-2003, 11:02 AM
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Default Re:VAFC setting w/ stock injectors

Originally Posted by beerbongskickass
I am pretty sure the afc doesn't add fuel though it just leans the injectors out. You will need something to add fuel... that's what I meant.
That is incorrect. Just as you can scale your MAP sensor voltage down, you can also scale it up as well. Though I have only seen this midly effective.
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Old 08-13-2003, 01:17 PM
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Default Re:VAFC setting w/ stock injectors

Could you maybe explain that a little more? I have read that thread about the afc hack a few times, but I guess I am just not gettging it. Do I at least have the basic idea right? You want to reduce the map sensor voltage so it doesn't sense boost and you don't get a cel. That's why you use larger injectors like 450cc. This way your ecu will think it's supplying fuel to your stock injectors, but since your running larger injectors you will have more fuel and not run lean. I just assumed if you used stock injectors it wouldn't work very well and not supply enough fuel.

I will eventually understand this fuel management crap.
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Old 08-14-2003, 08:22 PM
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Default Re:VAFC setting w/ stock injectors

Originally Posted by beerbongskickass
Could you maybe explain that a little more? I have read that thread about the afc hack a few times, but I guess I am just not gettging it. Do I at least have the basic idea right? You want to reduce the map sensor voltage so it doesn't sense boost and you don't get a cel. That's why you use larger injectors like 450cc. This way your ecu will think it's supplying fuel to your stock injectors, but since your running larger injectors you will have more fuel and not run lean. I just assumed if you used stock injectors it wouldn't work very well and not supply enough fuel.

I will eventually understand this fuel management crap.
No, you're correct about why we use 450cc injectors with a MAP scaling device. Stock injectors won't provide enough fuel for higher boost (4psi+) applications without increase fuel flow. Either from an FMU, or MAP retuning.

I was jsut correcting the fact that if he were to run N/A, he could add more fuel by going positive with his V-AFC instead of just negative.
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Old 08-14-2003, 10:56 PM
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Default Re:VAFC setting w/ stock injectors

Oh okay I got it now... I wasn't sure if you could go positive or not.
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