View Single Post
RarlyL8 RarlyL8 is offline
Crotchety Old Bastard
RarlyL8's Avatar
Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,527
Reducing the A/F one point from 13.1 would be 12.1 which is perfect.
Your fuel pressure is inadequate. You need ~90psi at your HP level. I have never messed with the SC fuel head but I would presume that it contains the pressure regulator like the 930 unit does. If so you can increase your pressure at that point. The stock SC fuel pump will also be marginal at best. You can leave it and add the 930 rear unit or replace it with a larger flow unit of your choice.
The 153 WUR is a good unit. You should be able to do anything you want with it.
The timing on a turbo is set ~26* @ 4K and locked down for most applications. There is no active boost retard. I know Ben (M&K) has solved this issue on his car, there are others as well I am sure.
RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 09-06-2007, 12:15 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #12 (permalink)