Quote:
Originally Posted by Daves2JZ
Side note. Rather then plugging the vac port on the number 2 TB I'd suggest using a T in the line to the MAP sencere. The problem with the system as you have it is that the sencere will have a true pulsation effect. Normally the vac signal would be places in the intake plenum (witch we dont have) after the TB giving you a true constent mesument of manifold pressure of the system not just one of the cylinders in the system. The way you have it now only when the one cyclender Is sucking in will it produce vacumed. If T ed into the second cylinder then the pulsation will be minimized since the cylinders intake stroke is offset from each other.
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Thanks, Daves2JZ!
This is really a good one, very knowledgeable, even though not applicable to our system.
Our system uses the pulsations instead of smoothening it. Why? to accurately measure the vacuum. This is truely the key for small engine controls, only by knowing the characteristics of pulsations can you measure the air charge exactly into the cyliner.
True, it only measures the 1st cylinder, but that is better than the average of the whole intake stroke. That is the advantage of our EFI to others like Megasquirt. The vacuum to the 2nd cylinder will be adjusted by O2 feedback.
Plus, the pulsations tell us the phase info of the 4-strokes, making our EFI full sequential! no waste sparks, no double fuel injections!
For this engine, running at 14000RPM, without the full sequential, good luck!