Twins vs Single
 

What is "better" for the motor? Not what makes more power, not what do you prefer, not what type of boost response do you want etc. As far as longevity of the motor, primarily from the heat generated by the turbines, what is better for the motor? Do the twins really produce that much more heat?

I have 104xxx miles on my motor and it still seems to be running strong. I did remove the precat however.

So if you were to run stock (ish) boost levels, >12psi is there any reason to go single at all? IE choosing 99 spec twins vs a small single like the RX6

IMO the simplicity of it is worth it enough. You can get the same spool of a sequential system out of a single, and as much or more power. Even at 12psi, you'd be making more power than with twins. Not to mention your underhood temps would be way lower probably.

the best thing to do for the engine, is to get the turbines as far away from the motor as possible (especially any aluminum parts)

Technically, it would be using a larger turbo and running it at a lower boost level (i.e. some turbo that could take say 20 PSI, but run it at 8-10 PSI). This would produce good power without overworking the turbo and low charge temps.

Cork Bell has a book on the subject:
http://www.amazon.com/Maximum-Boost-.../dp/0837601606

However, the problem with the suggestion above is finding a turbo to give decent response at those lower levels and rpms.

With as many different combinations of wheels/turbines you can get, it is definetly possible to map out the "right" turbocharger. In the near future, I am utilizing a borg warner turbocharger that has the characteristics of three different turbochargers. Unfortunatly I cannot produce hard fact(s) of such a "snail", but in all due time :icon_tup:

-Hoots