Thread: Gt30-76r
View Single Post
911nut 911nut is offline
Metal Guru
911nut's Avatar
Join Date: May 2001
Location: Beverly Hills, Michigan
Posts: 2,524
Originally Posted by 911st View Post
My thinking, for what it your conclusion makes sense for the cold side. Looking at the maps for the 7200 and Large GT30 they almost look the same.

Calculating mass flow of 52 lb and pressure ratio of 2.4 atmo (.9 bar of boost) generates a point that is right on the edge of the choke line of both compressor maps. Lay that same point onto the GT35r map and it is comfortably to the left of the choke line.
This is why the hot rod 964 Turbo S wasn't boosted above .9 bar by the factory. The air at 1 bar would be really hot, so that there was little hp gain and lots more thermal stress placed on the engine.
Paul B.
'91 964 3.3 Turbo
Port matched, SC cams, K27/K29 turbo, Roush Performance custom headers w/Tial MV-S dual wastegates, Rarlyl8 muffler, LWFW, GT2 clutch & PP, BL wur, factory RS shifter, RS mounts, FVD timing mod, Big Reds, H&R Coilovers, ESB spring plates- 210 lb
Old 10-20-2010, 06:12 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #25 (permalink)