Quote:
Originally Posted by vlad
The pressure of CNG going to engine will be low
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From what I've been seeing / reading , the CNG is fed into the air intake of a diesel @ low pressure.
(Getting it in along with the diesel would require very high pressures on CR or DP set-ups.)
The amount they feed in, is regulated by the TPS (throttle), and diesel injection is reduced because you need less throttle to keep a given speed or engine load.
(it may be necessary to dampen / reduce throttle input from the pedal to the ECU to keep the car drivable as you're feeding in more fuel than normal - yet not too much as you still want to be able to drive it on diesel alone if you're out of CNG.)
Without throttle input, you can let it run on diesel and the regular idle regulator in the car.