Originally Posted by
anjin
I belong to a local club were we do technical sessions on various topics. So if you're presenting you do a lot of homework. The information like this is available in various places - its a matter of finding and assimilating it. Plus I have rebuilt engines, assisted with other rebuilds, done engine swaps, and so on.
To expand on the topic a bit, the maximum cylinder pressure in an NA car varies between 900 and about 1400 psi. Boost it or up the compression ratios and you start looking at 2000 psi. Thats why getting that point correct is important - 2000 psi at tdc means you bust the bearings pretty quickly. Get it too late and you waste the effort. Arranging things to get it correct is the tuner's art.
Get pre-ignition (knock) and you start seeing 3000 psi plus spikes which busts pistons and rods.
Re the more general discussion on small or large turbo and starting cr, everything I see agrees with isitqik and DL001- its the total package and how its put together that determines a lot of what you get. Talk to the people who have experience with your motor, know what your goals are and where you will use the motor, and go with 'that' package.
And then don't go a change it up without getting it retuned!