Hey, I've got a '91 CRX VTEC with some adverage mods were 1 of the includes the APEXi V-AFC.

My problem is that i live in Portugal and in here, there aint any1 that can tune the V-AFC. Hell, there are very few ppl that actually know how to work the basics of it.
So im asking here for some help/guidelines/how-to/whatever on how to tune up my car or any other Honda. We (me and some friends) have access to dynos but dont have a idea on what to do atm to tune it up... Random testing is kinda out of question since we cant afford for all the big f*ck-ups we do, so any help that can help us improve our knowladge in a safe way is greatly apretiated.


thks

 

k ill see what i can explain

when u go to settings, on the first 2 options u can fix the air fuel

when it is on 0% means is still running the same maps as on the ECU

when u take or give % depending on RPMS it will increase or decrease the duty cycles of the injectors based on %.... % of fuel being injected ( the injector flow in cc)

this maps are not linear

means they dont really have to go from _1% to _10% gradually
u need a air fuel guage and or wideband on a dyno to tell u where u need the fuel corrected.

do a beasline run on dyno with air fuel to look at it

then based on the air fuel u can tune ( 13.5 air guel for N/A and 12-12.5 for turbo)

make changes on the respective rpm points depending how the air fuel looks to make sure u can get the most consisntant air fuel line to keep it on the 13's or whatever

always start with a big change on the % when u wanna make corrections...
start by changing around 6-9% at a time, and from there if u went too far and take away some... that way u can get it tuned

as far as VTEC engagement... make vtec kick at 8k rpms... run the engine, then turn the VTEC to 2k rpms and run it... match both dyno runs and whenever those 2 power curve meets, u want vtec to be on that spot

 

thanks. that helps alot
with that explaination it almoust looks simple

now im not 100% blind when i go tune it

thnks