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WinRice WinRice is offline
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Join Date: Jun 2005
Location: Colorado
Posts: 700
Originally Posted by Dr J View Post
Here is another thought. Without the injectors in place the FD can flow more than enough fuel; thus, the limit is caused by the injectors. Is there a different injector other than the SC injector that will flow more? In particular, the 930 CIS injectors at over $100 a pop (930-110-225-02-M14, 930-110-225-00-M14) vs the SC's (911-110-225-01-M14) at $35 each. Anyone tested different CIS injectors? What about Volvo/Audi/Mercedes/Saab/VW?
Per the chart above, the CIS injectors need a certain pressure just to open, so they will always be a restriction. They really are nothing more than than a fancy check valve with a nice spray pattern.

I'm willing to bet the SC and 930 injectors flow about the same, the big difference is system pressure. You need to get your system pressure up, and make sure you fuel pumps can support that system pressure. Per WERK's charts, the SC and 930 front pumps are the same. If your stock pump is in good shape, add the 930 rear pump and play with your system pressure. After each system pressure adjustment, you will have to go back and adjust you WUR control pressures to get your AFR in line. With low levels of boost, you could probably get by with the lower limit of 930 system pressure, about 6.2 bar.

I like Werk's idea of just getting a 930 fuel system, may be cheaper and easier in the long run.
1986 911 Turbo
3.3L, K27HFS, Tial 46mm, TurboKraft Intercooler, 964 Cams, Monty Muffler, MS3Pro Evo, M&W Ignition, Zietronix WBO2 Data Logger, Wevo shifter, coupler and motor mounts.

Last edited by WinRice; 01-22-2010 at 09:59 AM.. Reason: Added info
Old 01-22-2010, 09:54 AM
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