How much timing is usually needed to be pulled in order to run 25psi?
Turbo is a hahn Super 16g.

valve timing or ignition timing

I think he is talking about ignition timing.

yeah, why the heck would he 'pull' valve timing, if he could? You can do cam gears but that doesn't matter by psi, just boosted or n/a.

bagged - there's no correct answer, it all depends on the setup. Your exhaust/intake manifold design, pistons, AFR, octane, blah blah blah all influence it. I've read people running as low as 8* but as high as 20*. Best way is doing some dyno tuning with a scope or det cans if you don't have a fancy aftermarket knock sensor.

Originally posted by justins71
yeah, why the heck would he 'pull' valve timing, if he could? You can do cam gears but that doesn't matter by psi, just boosted or n/a. bagged - there's no correct answer, it all depends on the setup. Your exhaust/intake manifold design, pistons, AFR, octane, blah blah blah all influence it. I've read people running as low as 8* but as high as 20*. Best way is doing some dyno tuning with a scope or det cans if you don't have a fancy aftermarket knock sensor.

Thanks, I figured I would get that answer. I'm going to be running 93octane, so I figured it would be up around 12-15*. But all I have to pull timing is the Arc-2 which only allows you to retard the timing by a fixed 10*. You ground a wire and it retards the 10*. So, thats kinda wierd. But Maybe I'll only have to pull 10* or less, otherwise a snow stage II water/meth kit will have to be purchased ;)