View Single Post
911nut 911nut is offline
Metal Guru
911nut's Avatar
Join Date: May 2001
Location: Michigan
Posts: 2,511
Originally Posted by mark houghton View Post
Hi Erick,

When I did away with the stock boost recirc valve and associated manifold, I left the AAV/decel valve connected pre-throttle body and left the vacuum line connected as well. Now, when shifting it vents to atmosphere. The only negative (if viewed that way) is that it causes a momentary richer mixture when shifting (AFR's drop to around 10.5 for a half second during shifts or sudden off throttle).
I did this too.
Being able to shift immediately keeps the turbo from decelerating as much. Now when I get into the throttle after shifting I've already got 2-3 psi of boost instead of 0.
Paul B.
'91 964 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, - 210 lb
Old 04-10-2010, 09:06 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #9 (permalink)