What are the advantages of the APEXi VAFC over the Jackson Racing VPAC? My friend is kinda set on this new JR one since apparently you don't have to dyno tune it. He has a 5g lude with ihe. I'm just pretty sure that the JR doesn't allow the A/F tuning that the APEX does. Any input would be appreciated. Thanks.

 

you got it. I think you can only adjust VTEC activation with the VPAC where the VAFC is more tunable. Which one to get depends on how much flexibility you need. I am sure the VAFC is more configurable, but thats bad if you're not going to tune it.

 

You would still have to dyno tune it. The VPAC simply adjusts the fuel automatically at the VTEC x-over, thus making tuning easier. However, without dyno tuning, you can actually rob HP by setting your VTEC point wrong.

Another downside I see in the VPAC is the lack of tuning ability. You can not control fuel intake. The VAFC gives you that ability.