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what is V/T UNMT for the vafc?????

Old 09-27-2003, 05:41 PM
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Default what is V/T UNMT for the vafc?????

what percent do I set this at??
racinskittle is offline  
Old 09-28-2003, 10:58 AM
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Default Re:what is V/T UNMT for the vafc?????

whatever percent you want your vtec fuel enrichment set at. just set it the same as what you have your fuel correction set in the vtec rpm range. its used when the ecu and the vafc are differents. so... if you are running 450cc's you MUST set this, or you will not be able to go past your vtec engagement point - you will flood the ---- out of your engine with fuel. and yes, i know this from first hand experience...hope that helps.
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Old 09-29-2003, 06:29 PM
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Default Re:what is V/T UNMT for the vafc?????

please explain this more, i think i need to know more !

as i am fitting my 450's n/a tommorrow!

thanks matt
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Old 09-29-2003, 10:47 PM
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Default Re:what is V/T UNMT for the vafc?????

ok... i have the same setup as you are planning(450cc's n/a). what you need to do is set all of your hi/lo fuel corrections to -46%(450 x .54 =243cc, 240cc is stock). in addition, set your v/t unmt to -46% to begin with. you can modify these settings, but start out with these and then tune from there. i personally have the hi throttle correction at -45% around the rpms where i set my vtec to engage. then i set my v/t unmt also to -45%. when i didn't have v/t unmt set, i couldn't go past 4800 rpms(where i set my vtec to engage). i was bogging at 4800 rpms because my ecu wasn't correcting fuel, so my motor was getting the full 450cc of fuel during vtec. if you dont set the v/t unmt, the vafc assumes your ecu will be correcting fuel during vtec(which your ecu does NOT do if you are using a non-vtec ecu, and if was a vtec ecu, it wouldn't correct it -46%). when you set it, the vafc overrides any corrections made by the ecu. it took me a while to figure it out, but after i read apexi's documentation a little more it made sense.
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Old 09-30-2003, 05:52 AM
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Default Re:what is V/T UNMT for the vafc?????

ok thats sorted it thanks!

HMT RULES!
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