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Old 08-24-2008, 02:53 AM   #41
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Did a quick google image search for "VICS cross section". Got this:

http://img49.imageshack.us/img49/942...ek11004sc1.jpg

Hope it helps you,matt
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Old 08-24-2008, 11:07 AM   #42
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Most of all this is above me, but with everything we have in mind, do we think this implementation will require MSII?
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Old 08-24-2008, 11:48 AM   #43
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I don't rightly know.

I kinda stepped back here for a while to see where this went. I'm not really clear on whether Abe intends to re-write the software to do crank-cam phase detection and thus implement closed-loop control, or whether we're content just running open-loop with the EBC map... I personally expect the latter would be sufficient, and wherever possible I try to avoid things like forking the code.
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Old 08-25-2008, 12:49 PM   #44
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Quote:
Originally Posted by Reverant View Post
How Are You Gentlemen. All Your VVT Frequencies Are Belong To Us.
Coolio.

Would you be so kind as to capture BOTH the cam angle sensor output, and the crank angle sensor output, in 2 conditions:

-full retard (disconnect plug to solenoid)
-full advance (apply full 12V across it)

I'd like to know if any edges between the 2 sensors cross over when going from advance to retard.

This info would be very useful for:
1) determining if my AEM can control full VVT phasing (PS I have a 99 head now)

If I were in that position, I'd write my own VVT control code into a standalone micro, and use the MS to output a VVT phase request to the controller.
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Old 08-25-2008, 02:57 PM   #45
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Quote:
Originally Posted by Joe Perez View Post
I don't rightly know.

I kinda stepped back here for a while to see where this went. I'm not really clear on whether Abe intends to re-write the software to do crank-cam phase detection and thus implement closed-loop control, or whether we're content just running open-loop with the EBC map... I personally expect the latter would be sufficient, and wherever possible I try to avoid things like forking the code.
Well, someone already posted (I thought) what the positions are, if you know how many degrees it moves (you do) you should be able to figure it out, even without a scope trace.


Well, I think I might skip the whole thing, deciding in the next couple days. But if I do, I'll start open loop, possibly progressing to PID.
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Old 08-26-2008, 06:27 PM   #46
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Ok, where *IS* the sensor for the cam? Does someone have a picture? I could have sworn I saw a black boxy thing on the back of the head
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Old 08-26-2008, 06:50 PM   #47
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it's the same sensor as your car but it's located on the top of the valve cover near the firewall. dont have any clear pictures of it. it's about 3 or 4 inches after the word MAZDA in the valve cover.
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Old 08-27-2008, 01:10 AM   #48
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The sensor sits on top of the tangs on the intake cam show in the picture.
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Controlling VVT-01-cam-tang.jpg  
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Old 08-27-2008, 02:11 PM   #49
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I was thinking of moving my sensor there, but I looked (for 10 seconds) under a friend's hood and thought the physical packaging of the sensor was different, and that it wouldn't fit....
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Old 08-27-2008, 03:24 PM   #50
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The sensor is exactly the same, down to the part number.
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Old 08-29-2008, 05:22 PM   #51
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becomming a bit more of a reality now, since I should have a VVT head on the way to me as we speak. Will keep you posted.
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Old 09-03-2008, 09:09 AM   #52
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Something to wet everyone's appetite.

Jim
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Old 09-03-2008, 02:01 PM   #53
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TPS, MAP, and BATT_LIGHT? This *is* pretty involved.

Well, my VVT head should be in in a week or two, ready to go on the car in 3-4. So... well timed! :-)

How come you're never over on the DIYEFI.org boards?
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Old 09-04-2008, 01:17 AM   #54
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The only thing missing is the AC_UP pin. Notice the pin on the bottom left, IACV. This circuit also acts as:

1) Battery light check (notice V_ALT), replaces stock ECU battery light.
2) IACV control with idle up.
3) VVT control
4) Immobilizer with support for car anti-hijacking (notice VSS, as soon as the car starts to move it stalls and doesn't catch again)

Jim
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Old 09-04-2008, 01:17 AM   #55
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The only thing missing is the AC_UP pin. Notice the pin on the bottom left, IACV. This circuit also acts as:

1) Battery light check (notice V_ALT), replaces stock ECU battery light.
2) IACV control with idle up.
3) VVT control
4) Immobilizer with support for car anti-hijacking (notice VSS, as soon as the car starts to move it stalls and doesn't catch again)

Jim
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Old 09-04-2008, 04:29 PM   #56
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Interesting! This explains a lot of the 'extra' stuff I thought saw on there. Can't wait to seem more!
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Old 09-05-2008, 12:45 AM   #57
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Quote:
Originally Posted by y8s View Post
Hear me now and believe me later:
http://www.y8spec.com/miata_tech/man/
I'm having trouble with it. I believe "4" in 01 speak is actually 3 in 99 speak. And I think the VVT valve is 3R (on page 5 listed as 4R) the Oil Control Valve, and that I'd want to put +12V onto 3D ("4D").

Does that seem right? Anyway, thanks for pumping me up!
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Old 09-05-2008, 02:27 AM   #58
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Reverant, are you building a VVT controller?
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Old 09-05-2008, 07:06 AM   #59
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Quote:
Originally Posted by JasonC SBB View Post
Reverant, are you building a VVT controller?
Uhm, yes.

Jim
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Old 09-05-2008, 07:10 AM   #60
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Quote:
Originally Posted by AbeFM View Post
I'm having trouble with it. I believe "4" in 01 speak is actually 3 in 99 speak. And I think the VVT valve is 3R (on page 5 listed as 4R) the Oil Control Valve, and that I'd want to put +12V onto 3D ("4D").

Does that seem right? Anyway, thanks for pumping me up!
Put +12V on 4D and apply PWM'd GND to 4R.

Jim
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