The delay exists in theory, but is almost infinitesimal. In any case, you will have no problem using the trigger angle and spark latency settings to tune around it.
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If there is a delay you can just play with the trigger offset till it's true again.
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I think Matt means the delay is on the order of the length of the wires divided by the speed of light (give or take). plus perhaps a couple milliseconds for processing.
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Yes, there is theoretically a bit of a delay from processing, but it's almost non-existent.
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I'm still a bit confused as to whether they are preset to a certain vvt profile or are they end user adjustable?
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It has a base tune on it that will control a 01-05 Miata engine, it is also fully adjustable via a 12x12 map.
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Originally Posted by shuiend
(Post 652991)
From what I understand the NB signals go into the VVT controller, get read and then converted to the NA CAS signals and then get fed to the MS.
Originally Posted by JayL
(Post 653171)
I'm still a bit confused as to whether they are preset to a certain vvt profile or are they end user adjustable?
Cilff's notes: fully tunable. You can download the software here: http://www.diyautotune.com/vvtuner/files/vvtuner.zip |
Originally Posted by Joe Perez
(Post 653351)
Based on what reading I've done, my impression is that you don't have to do it this way. If you own an MS1, then yes, you can use the box to convert the NB signals to NA format. But if you have an MS2 or MS3, you can just bridge the raw NB cam and crank signals and feed them into the MS as usual, and leave the VVT controller's "NA" outputs disconnected.
When MS3 gets VVT support added in I might look into building the circuits I then need. Edit: Joe I built my MS back in the beginning of 07 using the KingofLeet mods and then switching to your spark mods. So I am almost positive I would have to build the circuits to understand the NB signals. |
The current controller will output to anything expecting to see a NA CAS or the NB crank/cam sensors. Whether it's a MS, factory computer what ever you want to send the signal to. You can not bridge the signals, you have to go through the VVT controller.
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Originally Posted by Joe Perez
(Post 653351)
Based on what reading I've done, my impression is that you don't have to do it this way. If you own an MS1, then yes, you can use the box to convert the NB signals to NA format. But if you have an MS2 or MS3, you can just bridge the raw NB cam and crank signals and feed them into the MS as usual, and leave the VVT controller's "NA" outputs disconnected.
In my case I will like to continue to simply swap in the 99 OEM ECU when changing engines for annual inspection. The whole VVT setup attached to the DIYPNP DB15 makes it real easy to connect (but I'm getting ahead of myself as usual, I don't need to startup until April). :) |
Originally Posted by Joe Perez
(Post 653351)
Based on what reading I've done, my impression is that you don't have to do it this way. If you own an MS1, then yes, you can use the box to convert the NB signals to NA format. But if you have an MS2 or MS3, you can just bridge the raw NB cam and crank signals and feed them into the MS as usual, and leave the VVT controller's "NA" outputs disconnected.
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Originally Posted by shuiend
(Post 653353)
From the little research I have done if I wanted to feed my MS3 the NB signals I would have to build an additional circuit onto my MS board to understand them. Since I am to lazy to order parts and build the circuits I will just use the VVT controller box to feed NA CAS signals to my MS.
When MS3 gets VVT support added in I might look into building the circuits I then need. Edit: Joe I built my MS back in the beginning of 07 using the KingofLeet mods and then switching to your spark mods. So I am almost positive I would have to build the circuits to understand the NB signals. So I guess in theory you could use an NA cas on the exhaust cam and the 01 cam sensor on the intake cam and be ok. Assuming the NA CAS output matches the NB crank output (and phase). It would just be weird. HOWEVER, since I know Lars has both the NA CAS *and* the 2001 Crank wheel and VVT cam sensor... it's all moot. |
Originally Posted by y8s
(Post 653440)
I think i misread and then reread, but you are currently using your NA CAS for your MS3, right? That definitely wont get you far with the VVTuner. It needs at the very least a fixed (cam or crank) primary signal and a moving (intake cam) sync pulse to calculate cam advance.
So I guess in theory you could use an NA cas on the exhaust cam and the 01 cam sensor on the intake cam and be ok. Assuming the NA CAS output matches the NB crank output (and phase). It would just be weird. HOWEVER, since I know Lars has both the NA CAS *and* the 2001 Crank wheel and VVT cam sensor... it's all moot. |
Originally Posted by engled
(Post 653357)
Whether it's a MS, factory computer what ever you want to send the signal to. You can not bridge the signals, you have to go through the VVT controller.
Why is this, may I ask? On the Megasquirt, at least, I'd expect it to be insensitive to changes in the phase relationship between CMP and CKP, so long as CMP always stayed within a certain boundary between a given set of CKPs regardless of cam advance. Or is that the problem? I've not studied the relationship between the CMP signals and the min/max advance settings of the cam. Do they actually cross over a CKP pulse depending on advance? |
I'd rather keep MS3 on the NA style signals so it keeps the VR circuit free for things like the VSS. As long as it's NB accuracy NA signals I don't see any real reason one would be better than the other.
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Originally Posted by FatKao
(Post 653550)
I'd rather keep MS3 on the NA style signals so it keeps the VR circuit free for things like the VSS. As long as it's NB accuracy NA signals I don't see any real reason one would be better than the other.
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http://www.boostedmiata.com/gallery2...106_131741.jpg
Who thinks I should pull off the top to look at the insides? |
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Here is a spreadsheet that has what colors go to what pins on the DIYAutoTune harness that they sell with the VVT Controller.
Pin # CCM Pinout Wire Color 1 CMP (CAM) Signal to EMS [Output] green/black 2 CKP (Crank) signal to EMS [Output] white/black 3 CMP (CAM) Sensor Signal Ground [Input] green 4 CKP (Crank) Sensor Singnal [Input] white 5 CMP (Cam) Sensor +12VDC [Output] orange/black I added black stripes on my harness 6 CKP (Crank) Sensor +12VDC [Output] orange 7 System +12VDC [Input] red 8 OCV Control [Output] purple/black I added black stripes on my harness 9 EMS Ground brown/black 10 Shield Ground (EMS,OCV) 11 Shield Ground (CKP/CMP Sensors) 12 CMP (CAM) Sensor Ground black 13 CKP (Crank) Sensor Ground black 14 System Ground black 15 OCV Control +12VDC [Output] purple |
Originally Posted by y8s
(Post 653592)
Free samples of the MAX9926 from maxim, a half dozen resistors and caps and a 1" square PCB... and that whole area is free.
What does the input topology on the new controller look like? From the images, it's clearly all through-hole, which rules out the Maxim chips, but is it a dual opto circuit, an op-amp based design, comparators, etc? I can't make out the part numbers on the ICs from the photo which engled posted. |
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