Cut off point

[Booky]

We’re would the cut off point be on turbo psi be on running 93 octane?Before you need inter cooler or water meth system .To keep from pinging .

[Booky]

It would be 8.1 compression.

[buguy]

There are a hundred variables. But a guess I say 10 psi. I assume you are running a carb and locked out distributor?

[Booky]

Carb but cb digital distributor.

[buguy]

Still probably looking at the 10 psi range. Intercooler is never a bad idea at any boost level. Again there are tons of variables. Turbo, cam, drawrhrough/blow through, elevation, temp... Etc... But it seems like 10 psi is about the normal number I've seen the most throughout my reading.

[Booky]

Thank you for your input.

[madmike]

It also depends on fuel, he doesn't say where he lives , Cal. fuel ?

[Booky]

Live in Pennsylvania

[madmike]

Booky,you should have prudy good fuel over there maybe 12 lbs with that dizzy?

[Booky]

I find the gas quality issue somewhat interesting across the country.

[slowsixtyduece]

As was stated before, it all depends. Your combo, intake air temps, air/fuel ratio, ignition retard, state of tune, etc. all play a role as to how much boost you can safely run. Many who are running pump gas are seem to be anywhere between 8-14 psi or so. I'm personally running 10 psi on 91 pump gas, but with water-methanol spraying. I used to run about 8 psi without it and would get some pinging when the AT's were high. I am pretty careful when running pump gas as detonation can come upon you real fast even if you turn the boost up slightly.