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Jaguar 0.6-alpha Assembly Guide 
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Good progress! But MTX is not recommended for a whole host of reasons. Stick with EMStudio if you can get it built/installed/running.

Re jumpers: If you use 4 FETs to drive 4 injectors, you'd bridge those four FETs together using three jumpers and run 2, 3 or 4 wires from those pads to your block. If you then used another two of the FETs for idle valve and boost valve, you'd bridge those together, and run 2 wires to your block.

By getting Andy to put those jumpers there I've:

A) Confused everyone.
B) Allowed for optimal grouping of ground connections.

B means that if you have 2 wires for your 4 injectors and one fails, nothing bad happens. If on the other hand you had 4 wires for 4 injectors un-bridged, you'd lose a cylinder. In general, you could also have different resistanc paths for each injector affecting the opening characteristics of them relative to each other.

Fred.

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Sat Dec 13, 2014 11:01 am
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QFP80 - Contributor

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OK, I built EMStudio from the git master on linux again and now I can select FreeEMS on startup. Another baby-step :)

So to confirm I'm installing the jumpers correctly (I don't want to have to remove anything else, I nearly goatse'd the holes around C7), for four injectors I install as per this photo (pinched from John's page).
Image
Then for your example, idle and boost would share JP7, while JP6 would be omitted.

Then ideally each INJ-GND hole is earthed, but they don't have to be joined to each other with wire, that's what the jumpers are for right?

Oh and for the MAP sensor, will a single-ply silicone hose like this be OK? Should it be 3mm or a nice 'n' tight 2mm ID?


Sun Dec 14, 2014 2:26 pm
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For Hall Effect timing the schematic diagram says to connect RPM0-IN- and RPM1-IN- to ground, but the board doesn't have the -IN- and -OUT- suffixes. Is this right?:

Board | Diagram
RPM0+ = RPM0-IN-
RPM0- = RPM0-OUT-
RPM1+ = RPM1-IN-
RPM1- = RPM1-OUT-

Am I right to assume that the RPMn-Shield holes are for the shield wires around the signal wires?


Sun Dec 14, 2014 8:35 pm
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Get your EMStudio from my repo, git remote add, no need to re clone. View with gitg and you'll see a new commit or two on a branch, probably called unstable, which just as with debian is a synonym for "you want this".

Yes, you have the jumper scheme correct.

Re hoes, probably 2mm. That listing says silicone, and polyester, and the pics show reinforced. I ordered a bunch from aliexpress that had pics like that, but it all showed up unreinforced.

I can check my hoes later for you.

Fred.

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Sun Dec 14, 2014 8:36 pm
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Each RPM input is a differential pair with +ve and -ve inputs. The outputs go direct to the CPU. When you setup each input, the whole set of components for that input must match for it to work correctly.

Shield ground points are indeed for the shields :-)

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Sun Dec 14, 2014 8:43 pm
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Fred wrote:
Each RPM input is a differential pair with +ve and -ve inputs. The outputs go direct to the CPU. When you setup each input, the whole set of components for that input must match for it to work correctly.

Image
so..... the earth.... from the CAS
…. is joined....
to RPM0-, RPM1-, and a regular ground for the 12V?


Mon Dec 15, 2014 8:16 pm
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With hall/opto inputs, you need to provide the zero crossing. You do this by setting -ve to 2.5V grounding the -ve input achieves this because you have a 1k limit resistor there, and another 1k to 5V installed. then the pull up on the +ve input holds it to 5v and your CAS pulls it down to ground sometimes. When it goes up or down it passes the 2.5V -ve pin. Make sense?

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Tue Dec 16, 2014 10:44 am
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I think I get the logic but I can't get from that to being certain of how to wire it, which makes me think that I actually don't get the logic.


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Tue Dec 16, 2014 10:11 pm
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As long as the pcb is setup right, that's correct.

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n00bs, do NOT PM or email tech questions! Use the forum!
The ever growing list of FreeEMS success stories!


Tue Dec 16, 2014 11:30 pm
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