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RarlyL8 RarlyL8 is offline
Crotchety Old Bastard
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Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,563
28mpg is the highest confirmed figure I've heard, cangrats Don! No doubt that tool a lot of work.
The highest confirmed CIS 930 I know of gets 24mpg. When you are off boost things even out a bit for engines of varying levels of boosted HP. All should be capable of mid-20mpg on the highway.
Obviously tuning the fuel curve is paramount, but as Don stated tuning the ignition plays in as well. With CIS you definitely need an adjustable or digital WUR to optimise city mileage as the stock WUR's are fixed.
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 03-20-2010, 06:12 PM
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