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Speedy Squirrel Speedy Squirrel is offline
Rocket Scientist
Join Date: Jun 2008
Location: Detroit
Posts: 898
I wouldn't sing praises for CIS, but I wouldn't say it is junk either. I will say that getting rid of the flapper does make the throttle responsiveness like a modern car.

CIS = tap the throttle, throttle opens, air flows in and pushes plate, plate moves control piston, fuel flows into pressure balance chambers, fuel goes down long tubes and squirts into engine.

EFI = tap the throttle, TPS sensor signals ecu to increase pulse width, injector squirts in more fuel.

'nuff said about that. I would also say the ignition curve is not as important as the ability to modify it for current intake conditions. I have a lot of timing on my base timing map, and I use the MAP and MAT modifiers to back it off as required. This is the real "secret" to making a lot of power with EFI in my view.
Old 02-02-2010, 12:13 AM
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