Will the standard fuel pressure regulator attached to the fuel rail be sufficient for post-boost, or should/could it be upgraded to say a replacement from a factory turbo'd car (e.g. Nissan Exa)?????

Any pros/cons either way?

 

No it will not be sufficient. Most people put on an aux regulator.

 

Does it have to be a high cost aux pressure regulator, or will my suggested other option be sufficient???

TIA

 

will it fit on the Miata rail? Are you building your own rail? in theory, a properly sized factory FPR for a turbo car should be able to do what you need. However, they're not adjustable so it may not allow the fine tuning you'd want.

 

since the miatas computer doesn't really understand boost you'll need a fpr that increases fuel pressure as boost rises to add more fuel under boost. factory fprs don't really do that

 

Flyin' Miata has some old AFPRs on sale right now (Tue, 10 Oct) for $25 as the Deal of the Day. Even if you have to rebuilt it, that's a hell of a deal.

 

You can buy used vortechs all the time on the cheap.

https://www.miataturbo.net/forums/showthread.php?t=4943