Quote:
Originally Posted by Biginboca
1st stage - idling/lower engine speed range
At idle speed and in the lower engine speed range, the DISA actuator motors 1 and 2 are closed.
The intake air flows past the throttle valve into the resonance pipe. In the resonance pipe, the intake air mass splits. The air is fed via the collector pipe and resonating pipes into the individual cylinders. In this way, three cylinders are provided with a comparably high air mass.
2nd stage (Approx 3000 rpms) - medium engine speed range
In the medium engine speed range, DISA actuator motor 2 is opened.
In this case, it is assumed that the inlet valves of the first cylinder are just closing. The gas motion creates a pressure peak at the closing inlet valves. This pressure peak is passed on via the resonating and collector pipes to the in next cylinder in the firing order. This improves the filling of the next cylinder to be charged.
3rd stage (Approx 4300 rpms) - upper engine speed range
In the upper engine speed range, both DISA actuator motors are opened.
In this case, it is assumed that the inlet valves of the first cylinder are just closing. The gas motion creates a pressure peak in front of the closing inlet valves. The intake air mass is now fed via the resonating, overshoot and collector pipes. |
Thanks for clarifying how it is supposed to function but that is not what I observed. Note that I can only speak about DISA-2 since I did not connect the DISA-1 connector to anything.
"1st stage - idling/lower engine speed range
At idle speed and in the lower engine speed range, the DISA actuator motors 1 and 2 are closed. "
--> my DISA-2 was open
"2nd stage (Approx 3000 rpms) - medium engine speed range
In the medium engine speed range, DISA actuator motor 2 is opened. "
--> my DISA-2 was open
"3rd stage (Approx 4300 rpms) - upper engine speed range
In the upper engine speed range, both DISA actuator motors are opened. "
--> my DISA-2 was open
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Bottom line, my DISA-2 was open since it never closed in the first place. It opened 100% as soon as I started the car and remained open throughout the rev band.
Perhaps both DISA valves need to be hooked up inside the intake manifold for the DME to send the right signals to both based on loopback data analysis? That's what I am leaning towards now.