octane

[kandt]

i was just wondering, for this track season i was going to run race gas. my question is with my mods what octane would be good to run at what psi. with the proper tuning

bored .020, ross 8.5:1 street pistons,
no balance shafts,
oil cover welded from turbotrix for balance shaft removal kit,
ported head,
ss nitrate 1mm valves,
mitsu 4 piece head gasket,
web cams, vpe lifters,
all arp bolts,
ported evo III manifold,
ported95 o2 housing,
big 16g turbo,34 mm flapper,
3'' apex'i downpipe,
3'' apex'i n1 catback,
act 2600lb clutch,
fidanza flywheel,
walbro 255 fuelpump,
extrememotorsports mbc,
magnecor 8.5 mm wires,
k&n,
apex'i s-afc
sieman deka 550's
tdo5h turbo elbow,
2g mas,
dejon intake,
digital tuning pocket logger
autometer egt,boost,and airfuel gauges

 

[MikeyboyTSi]

The highest octane you can find. Look for VP C16.

The highest boost you can successfully tune for, without getting excessive knock.

 

[allwheelTSI]

with a 16g it looses efficency after about 24-25psi, i believe.