nsrZ32 wrote:Stock turbos are good for about 20psi even though they're not really efficient over 18. They can make approximately 400whp on a Z32 with all the supporting goodies.
As for the HKS ones, I'd need to see detailed pictures to deciper which they are. I might also be interested in those if they're solid and the price is right (nothing wrong with having a spare set).
Anyway, if you have any questions Z32 related feel free to hit me up.
Note - Stock turbos (the T25) has ceramic section which I heard had a max of 16psi and has a tendancy to fail at anything beyond that point. Stock actuators actually won't reach very high levels of boost as they have stock limitations. But 20psi would be attainable with a little tinkering but would not be safe...more of a ticking timebomb.
On the HKS turbo, you'll need to ID them. HKS had the GT2530 which is a very popular upgrade for the Z32 setup. Can be either 16g or upgraded sometimes to 20g and it will be tagged the "disco potato". But still....need more information or even a pic and we can be a little more helpful.