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I understand how the waste gate is supposed to work at high rpms / boost.
I believe that as long as I keep the max boost down, that I can run with the waste gate plugged in order to goose the power a little in the 2000-28000 RPM range. Since the truck is stock and there's no intention of running higher RPMs, it **seems** like plugging the waste gate is a good idea. I just want to make sure that I'm not missing something.
It appears that the wast gate also opens when at idle and possibly when you let off the throttle.
Are these important functions of the waste gate as well?
I understand how the waste gate is supposed to work at high rpms / boost.
It appears that the wast gate also opens when at idle and possibly when you let off the throttle.
Waste gate solenoid duty cycle commands do not necessarily correlate to the actually opening of the waste gate valve. There is not sufficient boost to overcome the spring in the actuator to open it at idle.
Backpressure (drive) from within the turbine housing can push open the waste gate flap from that side and boost pressure from the spider/solenoid moves the actuator rod to open it externally; given enough pressure to overcome the spring. Monitoring the EBP would tell you if the waste gate has opened by seeing a drop in backpressure.
Waste gate solenoid duty cycle commands to not necessarily correlate to the actually opening of the waste gate valve. There is not sufficient boost to overcome the spring in the actuator to open it at idle.
Good point. Thank you for bring that up.
Originally Posted by mueckster
Backpressure (drive) from within the turbine housing can push open the waste gate flap from that side and boost pressure from the spider/solenoid the move the actuator rod to open it externally; given enough pressure to overcome the spring. Monitoring the EBP would tell you if the waste gate has opened by seeing a drop in backpressure.
Very interesting. Could this cause what appear to be a "noisy" EBP reading where it cycles up and down fairly quickly?
For example here's MAP and EBP with the red hose plugged:
Very interesting. Could this cause what appear to be a "noisy" EBP reading where it cycles up and down fairly quickly?
For example here's MAP and EBP with the red hose plugged:
I would think this would be caused by the exhaust pulses of the multiple cylinders and is more prevalent due to the waste gate being held closed more tightly and only "cracking" slightly under high pressure.
