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Old 08-16-2016, 07:37 PM   #1
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Default MS3 Build Questions

I have purchased and began building an MS3 from DIY Autotune using the Megamanual (Assembly Guide - MegaSquirt(R) V3.0 Main Board). There are certain steps that require you to make decisions based on the vehicle. I can't seem to find anywhere which options to choose for the miata. Also I don't have an Ms3x, is it possible to do the build without one and what mods will this require? I have a 2000 with the stock 1.8 and I plan to use the MS as a standalone.
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Old 08-16-2016, 07:59 PM   #2
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Originally Posted by Dubois_Sam View Post
I have purchased and began building an MS3 from DIY Autotune using the Megamanual (Assembly Guide - MegaSquirt(R) V3.0 Main Board). There are certain steps that require you to make decisions based on the vehicle. I can't seem to find anywhere which options to choose for the miata. Also I don't have an Ms3x, is it possible to do the build without one and what mods will this require? I have a 2000 with the stock 1.8 and I plan to use the MS as a standalone.
Doing it without an MS3 will multiply the amount of work you have to do by approximately 10x. Just ask hi_im_sean

Read more. Franks guide should be out there somewhere. I think I have it hosted here too. http://sadfab.com/99-05MSGuide/99-05MSWestfield.zip
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Old 08-16-2016, 08:05 PM   #3
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you want expander board.

follow frank's writeup. google "frank megasquirt"

I dont build the harness the way he does.
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Old 08-16-2016, 08:18 PM   #4
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Thanks for the quick responses, I just ordered the expander. Just to confirm other than the harness I shouldn't need to order anything else, correct?
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Old 08-16-2016, 08:25 PM   #5
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nope. ms3 kit + expander will run any 90-05 miata.
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Old 08-16-2016, 08:29 PM   #6
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One more thing Brain, just a general question about forum courtesy; In the future as I undoubtedly will have more questions as I'm building the MS, is it better to reuse this this thread or start a new one?
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Old 08-16-2016, 09:54 PM   #7
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Originally Posted by Dubois_Sam View Post
Thanks for the quick responses, I just ordered the expander. Just to confirm other than the harness I shouldn't need to order anything else, correct?
wiring bundle for the ms3x is helpful.

Knock module is a good option to add.
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Old 08-18-2016, 03:27 PM   #8
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One thing Frank's page isn't so good at is showing how he connects that 48-pin Tyco connector to the MS3. Anyone got any details on that?
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Old 08-18-2016, 03:27 PM   #9
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Don't do it how he does it
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Old 08-18-2016, 05:23 PM   #10
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Originally Posted by huesmann View Post
One thing Frank's page isn't so good at is showing how he connects that 48-pin Tyco connector to the MS3. Anyone got any details on that?
I can document exactly how i build a harness this weekend for an alternative approach.
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Old 08-19-2016, 03:21 PM   #11
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That'd be nice!
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Old 08-20-2016, 06:30 PM   #12
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Start with a bored helper:




Populate the Mainboard DB37:




Populate the MS3 Expander DB37:





Acquire an OEM Harness connector:




Chop off the top pins so they are about 1/4" long:




Bend up the lower row so they are flat (try to actually fold them back straight):




Cut them flush to the top row:




Pre-tin the pins you'll be soldering wire to.
Put heatshrink on each of your wires. *SUPER IMPORTANT*
Pre-tin the wires.




Start soldering the Mainboard DB37 wires (I start from left to right, lower-rows to top-rows):



Follow up with MS3 Expander wires:




Melt the heatshrink so you ensure no wires will make a connection:




Follow that up with hot-glue so the wires stay secure and are less prone to vibration & stress:




And done:





You can populate the center connector for inputs and output, I used to do this, but lost my source for pre-populated connectors -- i hate crimping pins
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Old 08-20-2016, 06:50 PM   #13
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So I end up with something like this:



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Old 08-20-2016, 06:55 PM   #14
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Thanks so much, I'll be using your design for the harness now!
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Old 08-20-2016, 09:20 PM   #15
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What is your source for the colored wires.
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Old 08-20-2016, 09:45 PM   #16
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Last edited by Braineack; 08-20-2016 at 09:57 PM.
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