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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
Are you sure we are not both crazy?

How about just ditching the FD and put a magazine with a bank of EFI injectors there that are phased opposite each other.

Or, pull the metering pin assembly and replace it with a cartridge plumbed out the top of the FD center and hooked to a high capacity frequency valve or bank of injectors . No metering arm or pin needed.

It would take a pretty simple ECU to match the CIS's abilities. Could add temp compensation, TPS and other functions if one wanted.


I very much like the idea of using system pressure to compensate for boost enrichment. That is what Protomotive & the Vortec dose with there kits with EFI and it seems to be able to compensate quite well. I think most EFI injection starts at around 30 to 45psi and by bumping pressure support twice the HP.

If we can operate at about 52psi ( 3.5 bar) N/A and up to 120psi (8 bar) on boost it might work well up to 1.3bar boost.

The challenge is we do not want the metering plate to stall before our peak on boost HP level is achieved so we need on our base (and only) control pressure to to keep the metering plate from stalling before say a peak of 600hp is reached. We might think of converting the WUR to a vaccum sensing for on cruse AFR and a little lower for N/A WOT AFR.

This will reduce the restriction at the metering plate to some degree over that of a 930 before 5 psi where enrichment is triggered for a little faster boost response.

Thus, 100hp at N/A WOT would be at about 13.2/1, at .7 bar, about 12.5/1. At one bar about 11.5. with a boost sensitive level of enrichment.

The more boost, the higher the AFR.

One a 930 it is only N/A AFR or after about 6 psi on boost AFR.

What is the control and system pressure levels an SC operates at?

Last edited by 911st; 01-21-2010 at 02:46 PM..
Old 01-21-2010, 02:43 PM
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