Pulley ratio (CAX?), variable cam airmass - E92 doesnt have these

[maudyZ28]

hi all,

any information or e.g. CAX indication about these parameters would be great.

Short story - i'm putting a pulley on the Z06. I have seen e.g. tunes from a 757 and other cars from the 'other' forum, and they have access and mention 'pulley ratio' and 'variable cam air mass' (I think related to knock).

The former - pulley ratio I do not see in EFI live anywhere. From what I see in the 757 tune, there is very little changed in the way of apparently getting this setup to work well (of course torque model changes, nothing to Driver demand, some spark and fueling) - so i'm assuming the pulley ratio does something behind the scenes - that _WAS_ changed.

From other tunes i've seen 'variable can airnass' being increased from 1.6 to 1.8 cyl airmass. The 757 tune didn't do this, but some have noted it might be needed for a pulley swap etc.

I'm really really pushing for using my EFIlive - that i've adamantly used for over 10 years for vettes and camaros, but the deeper i get into the E92 the more opaque some of the changes are, or things are missing

[maudyZ28]

so 12000 views, no reply?

@efilive, don't you have these tables? Or does anyone know how to get a CAX working ?