Take a look at my board. Help me sort and prep my MS.
 

Just wanting the gurus and others more experienced than I to look at my board and advise on a couple of issues.

This is a Braineak build but I believe this was an early one. It was also built for a 1.6 and I’m using it on a 1.8. We’ve discussed it but not in detail and I feel like I’m being a pest so I’m putting it out here for help.

First – Going through Brain’s “how to”, there’s a pic that shows the spark outputs reversed from the graphic. He noted not to duplicate his but my board matches his photo, not the graphic. So I’m wondering if I should leave mine as is or reverse it.

Graphic:
Attachment 7766


Scott’s pic:
Attachment 7767


My board:
Attachment 7768


Second – My board does not have the .1µF capacitor on the tach input circuit from JS8 to ground. Should I add this? If so, can I use the same ground pin as the EBC MOSFET?


Third – I’m pretty certain the LEDs are backwards, no?
Attachment 7771


I also have a 100k resistor on the EBC (@ JS2), so I need to change this to a 100 ohm and add a mica insulator on the IRLZ44. Right? Do I need to re-attach the MOSFET with a nylon screw or will the metal one still be OK? It's mounted to the front of the case.

Lastly – I believe I need to add a diode for the idle mod. What diode do I use? I’m planning a parallel install for now so I suppose it doesn’t matter, but I’d just as soon do it now while I’m monkeying about with it.
Attachment 7772

Whew! Thanks for takin’ a look. Once this is sorted I guess it’s on to the parallel harness changes. THAT should be interesting……

leave them alone if you are using the harness I built as well.

add it if you plan on using hi-res 10g firmware.

they are; snip them, flip them, solder them back.


correct.

yes, that's the EBC IZ144 FET...that needs an insulator as well, you can use the metal screw if the rubber gasket thing is there.


you actually can put a diode on both those the Idle and EBC FETs right there on the board. stripe side to s12, then on to each of the middle legs of the FETs.

like this:

http://www.boostedmiata.com/MS/built/Oscar/CIMG1258.JPG

any 1A diode should work

http://www.radioshack.com/product/in...Id=2062589&cp=

Follow the DIY guide as far as spark goes.
You need the capacitor on the tach signal if you want to run the Hi-res code.

Not so sure on teh EBC stuff, but if you are insulating it with mica for the love of god don't un-insulate it with a metal screw.

For the idle stuff, you can probably get away with just about any power diode (think 1n4001, 1n4004, 1n5404, etc.).

or

word on what Braineak said

Cool. One diode for each FET or share 1 for both?

Thanks Brain!

Yeah, that's why I asked. Seemed weird that it needed insulated but was attached with a metal screw! I'll change it.

Thanks! I may have some old 1n4001s laying around....

1 for each.

regarding the EBC. when I first started doing them, DIY didn't send them with any insulators and I had no clue they needed them. The resistor was their mistake as well as the package was actually labeled 100ohms but had 100k ohm resistors instead.

Dont use a metal screw on the fet, trust me. It does not help. swap for nylon with one from the map sensor.

Yeah, I know. I remember reading that. Didn't mean to try and sully your name or anything! :)

Any thoughts on what I need to do with that harness?

Also, what's the diode on the EBC for?

same reason it's on the idle valve...the prevent voltage spikes and whatnot.

for the harness...you can compare the two diagrams and see where you need to move wires...it's not many..

injector wires need to be split to 2Y and 2Z
TPS input should be added
Probably want to connect all four ground spots (2A, 2B, 2C, 2D)
fuel pump ground to 2T


that should be it, not much is different.

Awesome! Maybe I WILL get this thing in before the summer is over!

For the record, all firmware versions can benefit from the cap mod. We discovered the benefits from the cap mod while hunting down a misfire issue with regular MS1/Extra, and it's been standard on the MSPNP ever since.

OK. All updates, revisions, corrections, complete on the board. The harness awaits...

I have one question about the diodes for idle and EBC. I tied the banded ends together and soldered to the board (ran the other side to the center legs of the FETs). I assume this is ok?