its a direct fit-- like i said before, the 1980's 300ZX turbo used the same automatic as mazda

Cool.

Maybe you can tell me, how much can i rev without harm to tranny?

You can rev it till it shifts. In your final gear, you'll probably hurt the engine before the transmission.

Hmm why?
While with manual tranny the engine can be spinned up till 6500 , before shifting.why it cant be done on auto?

I was partly being a smart-ass. Just change the vacuum shift modulator like Pen says, and you should be able to shift at redline.
What I'm saying about your final gear is that sustained high RPMs will likely damage your valvetrain before your transmission. You can still spin it to 6500 if you choose.

Youll really have a much better time than having a turbo just having a manual swap. I promise you the tightly geared manual is the BEST part of owning one. Blasting down a back road shifting and pushing the car is the best time in the world.

The probkem is to get full set of parts.As mentioned before, i'm far away from USA and my Miata is one of thre i our country

How about being considerate AFTER reading and realize that doing a auto/5 speed swap just isnt possible for him, and making him repeat himself like a broken record isnt helping the questions he's asking. This isnt your thread, and if you have nothing of value to contribute here, gtfo.

axmed, turbo your NB and make it moderately boosted and you'll be having fun in no time. Remember, you need the adjustable, turbo referenced modulator from a 1988+ Z31 300ZX turbo after you get all your turbo parts and ECU. Like monk said you dont want to be redlining it all the time, however; But i didnt have a valvetrain issue, my issue was my first gear clutch pack giving out and shuddering, but I dont fully blame the 16+psi i was at, it was a junkyard tranny

Guys, lets respect each other and please stop it :)
Peace to everybody!

I cleaned things up a little more in this thread. We need to read the information posted by Ahmad and respond appropriately to his needs. I don't care who started it, but you are both wrong and acting childish for continuing in this man's thread. He needs help. I take this seriously. I'm contemplating making you both sit out for a week for this foolishness.

Sorry, Ahmad, for the interruption.