MOP Adjustments
07-04-2007, 08:17 AM
#51
Metatron
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Theory, part II........
Not saying the stopscrew is not the reference, just warning people not to base further leaps of theory on this one, until it's proven/disproven.
Your silicon theory is equally valid, or the motor unit could have a return spring......we aren't sure yet.
S
Your silicon theory is equally valid, or the motor unit could have a return spring......we aren't sure yet.
S
07-04-2007, 12:33 PM
#53
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There would be no need for a hard limit if the absolute value of the stepper motor was known by the ECU.
Still just supposition, most of the encoders I am used to at work are just a slotted disk with a photosensor. But given the turn rate on this thing, I doubt it. Maybe hall-effect?
Still just supposition, most of the encoders I am used to at work are just a slotted disk with a photosensor. But given the turn rate on this thing, I doubt it. Maybe hall-effect?
Last edited by RX8PDX; 07-04-2007 at 12:36 PM.
07-04-2007, 01:36 PM
#54
Registered
Hall effect and photo-sensors usually indicate that steps have occurred. The resulting pulses go to a counter that determines position from a reference location. I believe some stepping motors have internal digital encoders but this requires a multi-wire signal cable coming back from the motor. In the electrical diagram of the MOP stepper, the motor appears to have only power cables.
07-04-2007, 03:48 PM
#56
are we thinking too damn much on this? I know I do at times. I dont think the pcm is that smart. Shutter to think that it is. If it is then why the hell are some cars NOT using any oil when they should be anyway? And if it is that smart then why build a set screw in the 1st place. as mentioned it seems most likely to me that resistance stops the thing?
Wish I had the time to fool with this right now. But mine is a daily driver kind of thing.
olddragger
Wish I had the time to fool with this right now. But mine is a daily driver kind of thing.
olddragger
07-05-2007, 08:01 AM
#57
Registered
Yes it would be nice if someone could put this thing on a bench, apply oil pressure to the input, position the sector gear by hand, and plot output versus gear position.
As an explanation of why there is so much variation, I'm still wondering if the valve opening is so small that small variations have a large effect on flow. The flow through a small opening, say a tube, varies as the fourth power of the diameter. That is if the diameter doubles, the flow goes up sixteen times.
I did a calculation to determine the diameter of a quarter-inch long opening that would flow about half a cubic centimeter of oil per minute with a driving pressure of fifty pounds per square inch. I got approximately five thou. If that is increased(decreased) by one thou, the flow rate triples (drops to a quarter).
Mazda knows all this so it's all speculation.
As an explanation of why there is so much variation, I'm still wondering if the valve opening is so small that small variations have a large effect on flow. The flow through a small opening, say a tube, varies as the fourth power of the diameter. That is if the diameter doubles, the flow goes up sixteen times.
I did a calculation to determine the diameter of a quarter-inch long opening that would flow about half a cubic centimeter of oil per minute with a driving pressure of fifty pounds per square inch. I got approximately five thou. If that is increased(decreased) by one thou, the flow rate triples (drops to a quarter).
Mazda knows all this so it's all speculation.
07-05-2007, 10:28 AM
#58
MM, how do you know your OMP is not injecting the right amount of oil (or any)? Did you disconnect the lines with the engine running and measure the flow?
is there a procedure to measure the renesis omp flow by disconnecting the lines and runing the engine at a certain rpm for a minute or so while collecting the oil and measuring it like there is for other 13B's?
is there a procedure to measure the renesis omp flow by disconnecting the lines and runing the engine at a certain rpm for a minute or so while collecting the oil and measuring it like there is for other 13B's?
07-05-2007, 10:46 AM
#59
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It gets curioser
I just noticed in the manual that there is a nozzle where the oil is injected into the housing. It has an 'air' line connected to it and is tested by applying vacuum to it. Is this yet another level of oil injection control?
07-15-2007, 11:25 PM
#61
2005 Ti Gray RX-8 - SOLD
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In case anyone wants some spare parts or to play around with one...
I bought an AT steering wheel from this guy and got it with no problems... he seems to be a good seller...
http://cgi.ebay.com/ebaymotors/ws/eB...ADME:B:EF:US:2
-C
I bought an AT steering wheel from this guy and got it with no problems... he seems to be a good seller...
http://cgi.ebay.com/ebaymotors/ws/eB...ADME:B:EF:US:2
-C
Last edited by Chamberlin; 07-15-2007 at 11:30 PM. Reason: ridiculously long link reduced to less ridiculous length
07-16-2007, 08:59 AM
#62
Registered
07-16-2007, 09:46 PM
#63
Registered User
I can say with certainty that there are five wires to the APV motor assembly and that the part that Delmeister just discovered has been/is being discussed in two other threads. My guess is that three of the wires are for power to the stepper motor and the other two are for the sensor signal.
07-16-2007, 09:48 PM
#64
Registered User
07-17-2007, 03:36 AM
#66
Registered
If this is a pot, what is it's resistance.
The schematic shows 6 wires from the stepper, two from the sensor.
Last edited by Delmeister; 07-17-2007 at 04:04 AM.
07-17-2007, 07:45 PM
#74
Registered User
[QUOTE=MazdaManiac;1974642]Would've been nice to have that OMP diagnostic earlier.
Its not in the FSM.[/QUOTE
True,but it was inferred.I started looking at the DTCs in the FSM,but it was not clear to me,so I went to the Service Highlights.I will try to be more prompt next time
Its not in the FSM.[/QUOTE
True,but it was inferred.I started looking at the DTCs in the FSM,but it was not clear to me,so I went to the Service Highlights.I will try to be more prompt next time