Advice sought on tuning intake ports
01-27-2006, 08:34 PM
#76
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Originally Posted by MadDog
Okay, I gotta say it: It sounds like you tried some kind of WB02 fooler to avoid fuel trim issues and that you are using an eManage....
04-05-2006, 06:37 AM
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So far, this is what I discovered on the forum and the manuals about APV actuation :
- the actuator is a DC servo motor that turns in one direction when it is supplied 12V, and the other when polarity is reversed.
- it cannot be actuated more than 3 seconds at a time - risk of burning it
- there is no mentions of mechanical stop to the system (that would stom the movement when APV is fully opened or closed) Q : are there mechanical stops?
- the system is controlled by the PCM in closed loop thanks to a (rotary?) position potentiometer feeding a 0-5V signal to the PCM.
I believe the system works in closed loop, with a DC motor controller opening and closing and determining the position with the potentiometer signal. It's basically close to the type of control you'd find for an Electronic Throttle Body (ETB), but without Pedal Position Sensors.
You cannot control it with a switch or a PWM driver. You need a proper DC motor driver with the necessary strategy. An ETB control strategy would work though with some trick for the Pedal Position Signal such a system would expect.
I have a few remaining questions about the APC actuation that I hope someone can answer :
1) Are there some mechanical stops at fully open and/or closed positions?
2) How many turns (could be a ratio of a turn too) from the APV motor to go from fully open to fully closed? This question is very important if one wishes to replace the APV DC motor by a rotary solenoid that's easier to control (any Turbo Boost Wastegate controller would do).
3) Has anyone tried to run with the APV always opened? And is there enough friction to keep the APV opened at all time without regulation?
I cannot find the answers to these questions by myself as I drive a SP 5MT version of the RX8...
Thanks for your advises and remarks,
Fabrice
- the actuator is a DC servo motor that turns in one direction when it is supplied 12V, and the other when polarity is reversed.
- it cannot be actuated more than 3 seconds at a time - risk of burning it
- there is no mentions of mechanical stop to the system (that would stom the movement when APV is fully opened or closed) Q : are there mechanical stops?
- the system is controlled by the PCM in closed loop thanks to a (rotary?) position potentiometer feeding a 0-5V signal to the PCM.
I believe the system works in closed loop, with a DC motor controller opening and closing and determining the position with the potentiometer signal. It's basically close to the type of control you'd find for an Electronic Throttle Body (ETB), but without Pedal Position Sensors.
You cannot control it with a switch or a PWM driver. You need a proper DC motor driver with the necessary strategy. An ETB control strategy would work though with some trick for the Pedal Position Signal such a system would expect.
I have a few remaining questions about the APC actuation that I hope someone can answer :
1) Are there some mechanical stops at fully open and/or closed positions?
2) How many turns (could be a ratio of a turn too) from the APV motor to go from fully open to fully closed? This question is very important if one wishes to replace the APV DC motor by a rotary solenoid that's easier to control (any Turbo Boost Wastegate controller would do).
3) Has anyone tried to run with the APV always opened? And is there enough friction to keep the APV opened at all time without regulation?
I cannot find the answers to these questions by myself as I drive a SP 5MT version of the RX8...
Thanks for your advises and remarks,
Fabrice
10-06-2006, 03:36 PM
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Has anyone successfully opened the secondary shutter on boost & spoofed the PCM? Same question for the Aux port valve.
If so, please provide all the juicy details and/or DIY.
If so, please provide all the juicy details and/or DIY.
10-06-2006, 04:29 PM
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Why can't one just unbolt the motor and turn the gear? I believe turning it counter-clockwise is the open position, but please confirm; it will be closed when you remove the motor, anyway. Then reinstall the motor but don't reconnect the harness.
10-07-2006, 04:12 PM
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Originally Posted by evilmiata
Why can't one just unbolt the motor and turn the gear? I believe turning it counter-clockwise is the open position, but please confirm; it will be closed when you remove the motor, anyway. Then reinstall the motor but don't reconnect the harness.
11-18-2008, 10:11 PM
#90
but there was no real confirmation as to whether opening the aux. port earlier was worth doing or not .........
If you follow the logic that Mazda had in designing this in the first place and open it at the same g/s that they do then with a turbo you would open it at around 4000 -4500 rpm
I think it would help with the lean spike as well .
If you follow the logic that Mazda had in designing this in the first place and open it at the same g/s that they do then with a turbo you would open it at around 4000 -4500 rpm
I think it would help with the lean spike as well .
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