Anybody knows what the significance is in setting the fuel trims to cross over for LVT and HVT?

As an example, let say LVT goes from 1k to 6k and HVT goes from 5k to 9k. What exactly is the resultant effect of setting say - LVT @ 5k is -45 and 6k is -44 and HVT @ 5k is -42 and 6k is -40 ??

I'm asking this in terms of the general effect it will have and in also particular the AFC hack.

TIA

 

Loads of AFC hackers out there. Someone must also be interested on this....

 

all right you hooked me.
with the vafc you have narrow throttle low and hi cam maps, wide throttle low and hi cam maps. I can't tell you the exact effect on your car because every set up is a little different. Basically the way the cross over works is let's say your low throttle setting is at 75% and high throttle setting is at 95% - anything below 75% throttle % is considered narrow throttle -whether you're on the hi cam or lo cam, everything above 95% throttle% is hi throttle regardless of hi cam lo cam everything between 75% and 95% will be extrapolated by the vafc, it will calculate a fuel setting for you in that range.

I believe most hondas are in closed loop (sensor feedback) below 72%, above that the ECU goes into open loop (non sensor - ecu map only) so keep your lo setpoint above 72% to keep the ecu in closed loop.

The "dropshop" method is something you might try to get the car to run ok and then tweak from that point, I don't have the link to that site anymore, but you should be able to search it and find it.

Be careful with the vafc, and keep in mind ignition advance (I use an MSD btm to pull time under boost)

I'm using the hack, but am fully aware that it is a half *** way to run, if I could afford standalone right now I would go that way,but for the time being - I'm hackin!

 

I understand the concept of the differing maps - LVT and HVTs and Wide/Narrow throttle and Low/High % xover throttle. However, which fuel settings will it use if your fuel trim lets say for Narrow throttle, the LVT @ 5k is -45 but for HVT @ 5k is -40 ?? What will it trim by, -40, -45 or an average of the two regardless of what your VTEC xover point is set at?? Do u see where I'm comin from?

Hmmmm, standalone.....yes I needz it very sooon....The buckling is driving me nuts!

 

.............Nobody knows?!?!

for the 1st to come up with an interesting answer..

 

which fuel settings will it use if your fuel trim lets say for Narrow throttle, the LVT @ 5k is -45 but for HVT @ 5k is -40 ?? What will it trim by, -40, -45 or an average of the two regardless of what your VTEC xover point is set at??

Ok you must have decreased your vtec crossover if you are on hi cam at 5K, am I correct. If this is the case you will have to also adjust your vtec unmatch setting.

I will have to think this through, let me get back to you