[hardk0re]

kamilk69,Mar 3 2007, 10:26 AM Wrote:well i run 8-9 psi but around 6000 - 7000rpm it spikes to 12, i say 12 is ok.

but you have to remeber that psi means nothing. 8 psi on a small turbo will produce a different power output than a large turbo at 8psi.

you cant measure in psi you have to measure hp. i could run a small turbo at 16psi and produce the same hp as a large turbo at 8 psi. it all about how much air your turbo can flow.

the safe limit for a stock zetec i think is around 250hp, then s*** starts to break,
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... to add to this its about efficiency. A small turbo pushing 16psi may be out of its efficiency and heating the charge air up allot more than a larger turbo pushing the same level of boost.