How many LBS of boost on 91 octane

[Spike913]

I wish we had 94 octane in CA, but how high can you boost with 91 octane?

im running 13 lbs on the PE1420 untuned

[Spike913]

ok high can you boost before detitonating, with all tha mods
FMIC, 550cc injectors, walbro fuel pump etc. and stock sr20 internals

ppl say 20 lbs with RAS ans stiffer valve springs

[nrg]

tune it and you can boost higher. boost depends on how good the tune is. not by the octane. octane is only 20% of the problem on boosting. it's called denation.

[HIGHMILEHATCH]

It's called detonation.

I would stop listening to the people telling you "20 lbs with RAS ans stiffer valve springs". That doesn't make any sense. Stiffer valve springs are necessary when upgrading cams. RAS prevent the rocker arms from flying off at high rpm. Neither which have any affect on how much boost you can run on a given octane. You mention you have 550cc injectors. What is controlling them? Please don't tell me stock ECU.

[wootwoot]

^^^bingo. I still highly recommend putting RAS in as soon as possible