Quote:
Originally Posted by chrisoverson
Cylinder deactivation I take it is tricky on a 4 cylinder engine because of how unbalanced it would make it. My plan is to use a microcontroller to disable one cylinder at a time but alternate between them. I.e. disable one for 0.2 seconds, then another, then another, moving in the firing order to minimize vibration. Don't know how well this would work but I'd have to see.
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Your O2 sensor is going to see extra oxygen in the exhaust and will richen the mixture to the other injectors. I don't think there's an elegant way to add aftermarket cylinder deactivation or lean burn, other than replacing/reprogramming the ECU.
Quote:
Originally Posted by chrisoverson
Yes I meant a throttle position of 3/4, as in the pedal three quarters of the way to the floor. Is this not right?
I'm not using anything except the fuel usage monitor I've made with an arduino. I want to fit a vacuum gauge but haven't yet, is that what I need?
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I was originally a little confused about this too. You reach full load when you have zero vacuum, but depending on how much air the engine is using that might be at different pedal positions. A decent way to gauge load is to find how far you need to press the pedal down before you stop seeing large gains in how quickly you accelerate, after this point you're already at full load and any gains are probably from the computer richening the mixture.
A vacuum gauge is probably your best bet, but you can get a good approximation of load without one.