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They already have forged internals from what I hear. Anything that runs 18 plus psi of boost stock has to have pretty strong bottom ends. Tuning is the key!

I don't know if you will be happy with the ball bearing turbos. Since the 7 is automatic, you need a smaller turbine housing for response. Either that or you will need a higher stall converter with the bigger turbo. Have you seen this K04/Garrett hybrid upgrade for the CX7?

what is happening when the boost drops and the top end falls off, that means that either the turbine wheel, compressor wheel, or turbine housing is your problem. I know its not the turbine housing b/c it is a decent size. Its either the turbine or the compressor wheel that is holding you back...

It shouldn't be hard to spool. I would estimate spool to be close to stock levels. I wouldn't want to hinder response at all. Since the engines are good for 400 HP, why not have a turbo capable of around that, and maximize its potential. Powerband will be impressive, mid range TQ will be...

Thanks a bunch. My name is Bryan Nickell and I am a Newbie to the mazdaforums. Some of you may have heard of BNR Supercars, some may have not. I was approached by an RX7 person that had a Mazdaspeed 3. He told me about all their problems with turbochargers and companies offering an...