Quote:
Originally Posted by renault_megane_dci
It is all very confusing for me because when the throttle is lightly opened, the pumping losses are very high (yes losses, that doesnt sound efficient at all) and yet we want to be in the higher gears (=> with small openings) as much as possible.
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When the engine speed is lower, the throttle position needed to maintain the same manifold pressure is lower, so without an electronic throttle, a lower throttle position could be giving you less vacuum and less pumping losses (and usually will)