by rpmchris » Thu Oct 27, 2011 7:28 am
I'm REALLY looking forward to your pics and description of the Mazdas at SEMA, Brian! I still have my fingers crossed that they decide to build & bring a lightweight NC to the USA (like the Super20 SEMA car last year) so I can finally remove my soft top!
Grippy, regarding the stock intake for the NC, I think you may have been told wrong...
According to the knowledgeable folks at Mazdaspeed, the stock intake (lightweight variable-intake plastic surge tank & aluminum manifold) on the NC is actually one of the reasons the 2.0 MZR makes good torque. Combined with the stock throttle body, it flows well enough to make stupid power with a turbo. It's good enough that no one has come up with an individual throttle body setup yet for the stock block & head (may improve hp slightly but at a loss of tq).
It's true that Brian and others are using the Cosworth barrel throttle unit on internally modified engines (2.3/2.5L motors with higher CR, cams, big valve heads, etc.), but it won't fit on the 2.0 without modifying the firewall (according to the knowledgeable folks at Cosworth), and wouldn't really help a stock block/head engine anyway.
Believe me...I'll be the first in line once someone comes up with a valid, tested, and proven replacement. I need all the help I can get in CSP!
'06 MX-5 Sport 6-speed
Autocross junkie!