Originally posted by "Someone"
Originally posted by RiceRocket:
The deal with turbos is CFM. 8psi on a Drag turbo is no where near the CFM of a greddy turbo. The greddy is smaller (so less lag?)
CFM is not near as important as efficiency. You need to look at Boost intended CFM (which is calculated from RPM and engine displacement) and then match to a turbo that is efficient in the boost range you need.
CFM being equal a larger turbo will generally be more efficient (well from the point its fully spooled) so...
14psi from a large turbo can produce at much power as 17psi from a small turbo because the large turbo is more efficient and the air discharge temps are much lower (there by making more power). BUT if you run say 8psi from the same large turbo and 8psi from the small the small may end up making more power because it is more efficient in that CFM range.
SO...pick a turbo that is designed for your application. I dont like off-the-shelf kits too much since they arent designed specifically for the application BUT it may end up being more cost effective.
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John
90 Talon TSi AWD (2KW K4U)
91 Galant VR-4 (1574/2000)
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