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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
On the rich for a turbo side on boost is good for CIS.

Rich at light load is not great.

That is why we have on boost enrichment. The factory set these up so that with 14/1 AFR at idle. They should see about 14.5/1 at cruse and about 10.5/1 AFR on boost when the mid to high 11's should be safe and make more power. However, going leaner than stock in search of power, one should make sure there fuel delivery system is well balanced and the AFR's adjusted seasonally.

Many tuned EFI turbos will run near 12/1 AFR on boost for power.

Most other make factory delivered Turbos are in the 10's on boost. We need to be richer on boost as CIS with a mechanical distributor dose not compensate for environmental conditions.

Of course, when modified the AFR's often are effected and can go richer on forst boost and then lean up top.

A good Wide Band and possibly an adjustable WUR can be nice additions if in search of power and MPG's.
Old 10-11-2010, 09:39 AM
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