well ive had my vafc2 in for a few days, completely untuned. ive done extensive searches on the vafc library on adjusting vtec, air, fuel, throttle, and it all still seem really confusing still

i know that when you lower the vtec point you need to compesate for air and fuel and adjust throttle. i also know that to gain the full potential of the vafc it needs to be properly tuned on a dyno.

my question is, can i lower vtec without adjusting fuel and air, to gain a small amount of horsepower? or is there a way that i can street tune? whats the steps?

until i get my car dynoed and tuned i know im not gonna reach full potential power, but what are the steps i can take for a small gain until then?

thanks guys.

 

it is very very complacating.....
i would say just take it to the shop and have them set it up as they tune ur car

church automotive is very famous with VAFC
310 787 7123

 

If your car is stock (aside from the V-AFC), then it won't hurt anything to lower VTEC 200-300 RPMs, but any more than that and you will likely loose power. Actually, since you have a CAI, you shouldn't do it. Every intake has different characteristics that will change the air / fuel ratio at certain RPMs. If you lower VTEC without tuning it, you may cause a dangerously lean condition between the new / old VTEC engagment points.