OK, so on a fairly fresh motor, fuel injected, how much boost or how long would the standard parts last?

I 'm not after as much boost as possible, but rather just a small bit for a bit more poke along at a safe level.

would need to decomp plate it i gather.

what is likely to give way first?

How much compression and what cam? Cranking compression is a good indicator.

You will kill cast pistons very quickly if you lean on it with a bad tune.

I would never recomend a decomp plate because about 99% don't match the bore properly causing bad crevice volume, making the engine more knock prone.

Never aim for a boost level but a power level. Boost is only a indicator of restriction within the system.

Any motor will handle about a 50% power increase over std at least and about 6psi minimum. Realistically you should be able to see 180fwhp at about 9psi with the right parts and tune. Don't retard to timing too much, found that one out the hard way. 1deg/1psi is a good start.

i've run pretty high boost on a std motor around 18psi + hasn't seen many kms lately cause the cluth is stuffed, but the motor seemed to hold together with only really a decom plate,

spigot , what was the result of retarding the timing too much ?

Retarding the timing TOO much will cause the fuel to burn in the exhaust manifold. A bright orange glowing manifold and turbo looks cool but it warps flanges, melts metal, kills turbo bearing, hammers oil temp, etc.

If you work on 1deg/1psi straight up that would be a good start, so on a pinto that means ~25deg total at max torque point. You can ramp up a couple more degrees after that but that is fine tuning.

This is why in their most crude form carby blow through doesn't work, they need something like a msd 6btm. The fueling is easy getting a proper ignition curve isn't. On the std dissy the vac can should work as an advance and retard for a budget job.

i run around 35 - 38 at 100kpa at around 3300 or so which is what a normal pinto would run then use the 1 deg 1 psi , think i might of even gone .8 it's been a while

so you boys would go decomp pistons over decomp plate? whered be a good place to look for either?

theres a place near the gateway bridge in brisbane that did my decomp plate i can't think of the name atm .. custom gaskets or something i look it up but it was 165 for a 2mm plate i thought about drawing one up in auto cad but never got around to it, would get it cut much cheaper that way i think