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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269

The info Jim gave you above is on target for modifying your fueling system.

The 3.6 CIS is a different set up. Injectors, metering cone, WUR... It would be tough to copy it.

If I would add anything, it might be to considering upgrading the fuel pump (s). There is some indication that may be difficult to maintain 'system pressure' at high rpm. This can be seen if shimming the Fuel Distributor dose not add fuel up top.

You know the basics that add fuel. lower Control pressure (WUR), higher System Pressure (shimming regulator), increased Differential Pressure (rebuild FD to different specs w increased diaphragm-orifice spring tension ).

The challenge then becomes tuning around these changes.

Lower CP only effects on boost AFR (all or nothing) and can be delayed with an RPM switch and solenoid.

Increased SP and DP increases fuel progressively with increases in air flow. Thus, cruse AFR might be richer.

The adjustable WUR can get one close but there will be compromises. Electronic add ons like the digital WUR or a and on programmable Frequency Valve plumbed around the WUR can allow one to pretty much nail the AFR's at all points.

An alternative might be to build for low end instead of peak HP and live with in your current fueling. You know the 3.6T has more compression so you might pull boost back about 2psi compared to what the 3.3 ceiling might have been to maintain the same effective on boost compression ratio.

Sounds like a great project.

I still think you nailed it with your SBB/60-1 turbo. Have not heard of a better set up sense.

The best.
Old 07-30-2010, 07:44 AM
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