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Just finished installing turbo on 99' civic si, how do I lean out the Vafc?

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Just finished installing turbo on 99' civic si, how do I lean out the Vafc?

Old 06-06-2004, 09:41 PM
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Default Just finished installing turbo on 99' civic si, how do I lean out the Vafc?

When I put the gas pedal down all the way my car bogs as if it's being flooded with gas. When I press the pedal at a medium pace til all the way down it runs good. I have 450 dsm injectors, 255 walboro in tank pump, & Apexi Vafc set at the recomended settings on the FAQ. How do I lean out the gas with the Vafc? Thanks in advance.
.63 trim nissan t3 turbo @ 6.5 psi.
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Old 06-06-2004, 11:40 PM
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Default Re:Just finished installing turbo on 99' civic si, how do I lean out the Vafc?

to lean it out you make the settings more negative, ie: the closer to 0 you go, the richer you get.

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Old 06-07-2004, 09:47 AM
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Default Re:Just finished installing turbo on 99' civic si, how do I lean out the Vafc?

450 - 37% = 283cc
450 - 30% = 315cc
450 - 45% = 247cc


hopefully that can give u a visual explaination of what's going on.
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Old 06-07-2004, 10:15 AM
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Default Re:Just finished installing turbo on 99' civic si, how do I lean out the Vafc?

I have the Vafc set at -36 on a b16 @ 6.5 psi & it still runs realy rich. I can on give it full throttle at a medium
to fast pace.
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Old 06-07-2004, 07:28 PM
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Default Re:Just finished installing turbo on 99' civic si, how do I lean out the Vafc?

did u leaned out the hi and lo settings??
try setting the hi and lo -40 all across
that would make a difference.
how retarded is the distrbutor?? bring it back a few degrees and kkep and eye on ur afr gage.let me kno if ne difference
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Old 06-07-2004, 08:24 PM
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Default Re:Just finished installing turbo on 99' civic si, how do I lean out the Vafc?

::sigh:: Engine Management FAQ, section 2, question 4.
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Old 06-07-2004, 10:27 PM
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Default Re:Just finished installing turbo on 99' civic si, how do I lean out the Vafc?

I haven't retarded the timming. I put in NGKs' 4091s' they're 1 step colder gaped to .0028. Will retarding the distributor help with the problem? car bogging when I floor it down fast like it's running too rich, could only give it full gas if I floor it at a medium pace.
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Old 06-07-2004, 10:54 PM
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Default Re:Just finished installing turbo on 99' civic si, how do I lean out the Vafc?

Does anyone know what psi are the settings for the vafc in the FAQ for?
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Old 06-08-2004, 10:17 PM
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Default Re:Just finished installing turbo on 99' civic si, how do I lean out the Vafc?

damm i just took a second look on ur set up .
first u defenectly have too much fuel!!!
450's 255 pump and only boosting 6.5 psi??
get a boost controller and step it up to 8-10 psi with the dizzy retarded all the way just to be safe,or
put back ur stock injectors and an FMU and check valves and enjoy ur 6.5 psi.450's 255 pump and vafc overkill for that amount of psi.
i had the vafc too on my lsvtec 99 si and it ran great, just got to find the ideal mixture at idle so u dont ---- up ur plugs.
dont be afraid of 8-10 psi these blocks holds that amount with no prob...my 02's
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Old 06-08-2004, 10:28 PM
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Default Re:Just finished installing turbo on 99' civic si, how do I lean out the Vafc?

Originally Posted by robs99si
...what psi are the settings for the vafc in the FAQ for?
You don't set VAFC for "psi", you set it for injectors. Your injectors indirectly cover the psi available. You're limited _by_ the amount you have to scale your injectors.

Not, how much boost you want to run.
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