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Old 03-30-2009, 05:29 AM   #1
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Default Megasquirt V2.2 Help

Hi all i wondering if i could get a bit of help with a Megasquirt V2.2 which i brought of a member here, as he had stated it was out of an Audi ? Now it seem i will have to do a bit of work on this to get it to work with my ride as there seems to be a few componet missing from the board, now i have tried to read up as much as possible but there is not alot of info concerning this board on the forum, Now i have attach a board schematic to this post with the parts that are missing marked.

Now the componets marked by a blue Circle are the ones missing can any tell me which i need to replace ?

And as you see there are two yellow circles as well these have no componets but are brigded

And here is the interesting part C2 and D11 circled in red have componets but they have been cut, now from what i have been reading these will need to be replaced or joined.

And i know this may have been alot easier if i got the ms 1 v3 unit but the i got the V2.2 for a good price as our dollar suxs at the moment compared to yours.

Just two more question maybe 3 lol is there any info on doing the Relay Control Mod and the CAS mod for this board as i have not been able find much info about it for this V2.2 board.

Iam about to post a pic of my ride in the B/S section just to show you want type of car i am trying to shoe horn this 1.6 Miata motor into may give you a laugh

Cheers and thanks for any help you can give me
Dr.
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Old 03-30-2009, 09:16 AM   #2
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D16 is a zener diode in the power supply input section that looks like it was an attempt at revese-polarity protection perhaps. The MS will run fine without it.

D2, D3, D4, and D11 are 5.1v zeners that look like they were an attempt at protecting the TPS, CLT, MAT, and EGO inputs from overvoltage. These devices are no longer there on the 3.0 design. Forget them.

C2 is a noise filter on the EGO input. That component should be there. (It's 0.22F 50V)

D5 and D8 are diodes in the primary ignition trigger circuit. They are essentially remnants of the days of points triggering. Jumpering over them is normal when using a solid-state device, such as a hall effect crank sensor. I expect that there's also an extra wire to two soldered into that general area for a pullup.


Instructions for CAS mod: http://www.diyautotune.com/tech_arti...azda_miata.htm

Instructions for relay control: http://www.msextra.com/manuals/MS_Ex...al.htm#outputs
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Old 03-30-2009, 09:40 AM   #3
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[QUOTE=Joe Perez;388320]

D5 and D8 are diodes in the primary ignition trigger circuit. They are essentially remnants of the days of points triggering. Jumpering over them is normal when using a solid-state device, such as a hall effect crank sensor. I expect that there's also an extra wire to two soldered into that general area for a pullup.
[QUOTE]

Thanks for the feedback joe i do appreciate your info yea D5 and D8 are just jumpered there are no extra wires, the two red wires going to the two 1k resitor were allready on that diagram and i am assuming that is the spark mod for the V2.2 if not could you please enlighten me ?. or any other mod i need to do to get this to work using the stock ignitor ??
I will have a good at those links you suplied and see where to go from there.

Cheers
Dr.
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