how many lbs of boost Options

[Kerr1]

how many lbs of boost can a stock 5s head handle....im not worried abt. the internals just the actual head.

[NuclearHappineS]

the stock compression ratio will limit you to 8-12psi depending on weather the turbo is on the bigger side of things or the smaller side of things ... (the bigger the turbo the higher you'll be able to boost before you run out of octane and detonate).

so now you say you'll just drop the CR... sure, it will cost you 400 for JE or SRP custom 5sfe pistons... so now you can run 15psi possibly but you are limited to 240hp @15psi @ 5200rpms no matter what turbo you use (the head just wont be able to outflow that much... )

if your goal is 300hp on a stock head with the lowered CR it will take about 20psi to do it by my math...

a head that flows 19% more (like a 3sgte head) can do 300hp @ 15psi @ 6200 rpms

as for the water injection for the normally aspirated car... more timing isn't always more power... you already obviously have too much timing in it... if you add WI and you add even more timing you will lose your rod bearings from the added timing...

See at idle your oil pressure is low because hte rpm's are low... too much timing advance will mean that power is delivered and pounded down on your pistons/rods earlier than it should be (which is how you end up with detonation) ...

adding base timing is not the same as adding timing up top via an EMS or adding boost at higher rpms with the help of water injection...as when the rpms are up, the oil pressure is higher so there's less possibility for bearing failure...

... i wrote too much