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The others have mentioned several enrichment methods. The CIS does not have the equivalent of an acceleration pump like a carb, becuase it does not need one. With carbs, if you are at relatively low RPM and you stomp on the throttle, the air velocity through the carb decreases until RPM goes up, and mixture goes lean. The accelerator pump provides extra fuel for this transition. But CIS doesn't do that because it constantly measures airflow and adjusts mixture to the airflow and manifold vacuum.
The warmup regulator (more properly called a Control Pressure Regulator, CPR, because it regulates mixture a wide throttle settings) provides enrichment for acceleration, but it's enrichment according to airflow and manifold vacuum, not a "squirt" like an accel pump.
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners.
Cars are for driving. If you want art, get something you can hang on the wall!
Last edited by PeteKz; 12-30-2023 at 10:40 PM..
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12-24-2023, 07:01 AM
