i have aem cai, nuespeed n2 hearder, nology wires & denso plugs, hayame exhaust,
hayame fuel rail & regulator,hayame cam gears, aem pulleys, and a 50 shot ZEx, now what benifits would i get from the blue box and what does the vtec controller do and if adjusted to low or high will it mess up the engine or vtec engagment? i have noticed my vtec kicks in a little after 5000 could i move it lower and how would i adjust the air flow?

 

with that much mods, the v-afc probably benefits u the most
u can go to the dyno, or an A/F ratio gauge if u have confidence to urself
+ or - 10% fuel delivery from 1000->2000>3000... 9000 rpm
and u will definitely feel ur car with more power. definitey
u can lower the vtec setting down to 3100, but then u need to give it more fuel to eliminate the lean before vtec kicks in (low cam to high cam)
it's easy, just takes time to do it urself, i did mine for about 3 hours.
either way, u will love the v-afc

 

I take it you have a H22 and you mean the APEXi V-AFC?
It's good for adjusting your air/fuel ratio (when measured on a dyno with wideband O2 sensor). Most normally-aspirated H22s run real rich, so the V-AFC is good for leaning out the mixture. With your NOS setup, though, you'd use it to make sure your mixture stays rich. 99% of H22s with stock cams have the lo-cam and hi-cam torque curves intersect at around 4,700 RPM, and this is the best place to set the VTEC crossover. People usually gain almost 30 HP at ~4,700. Other than that, the V-AFC doesn't add to much power on the top end, maybe a few ponies if you're lucky. It's a fuel and VTEC managment tool.

 

3100 on an h22 is too low of a crossover, could be done on a single cam, but that is even too low, when i had my vafc i had my x-over at 3500

 

3500 is still too low. 4doorH22 hit the right number when he said from 4600 to 4700 for crossover point for optimum power.

 

Well he meant 3,500 for his ol' SOHC F22 VTEC.

 

Coo.

 

i had it 3100 on my turbo sohc f23a