How to Microsquirt Standalone EFI your LS engine!

Instagram: westcoastwrenchin
I recently built a Microsquirt setup for my friend's 1967 Chevy C10 and decided to video tape the process and make a quick tutorial for you! The micro is such a good ls swap item I can't believe more people don't use them.
The microsquirt is a really cool little unit and is similar to a megasquirt. It's a DIY EFI system. It's a bit different than a stock GM ECU because it runs batchfire, meaning it fires 4 injectors (2 on each rail) at once. It also runs wasted spark which means it fires two coils at once (one on the exhaust stroke). It does these two seemingly odd things to save circuit board temperature and space. This is not the MOST modern efi technology but it still works really well. You will sacrafice a little fuel mileage with this setup but it's minimal at most.
The micro has a ton of advantages over a stock gm ecu; it's cheap (less than $400 with harness), small, easily tunable, will teach you everything you need to know about efi, doesn't use an ugly MAF sensor, has free software to tune with (the ultra version is $90), and also has a lot of great troubleshooting functions (you can fire coils, injectors etc. from your laptop).
If you run an automatic transmission then you will need a transmission controller. In this case, it may make more sense to use the factory GM harness and computer.
This video is a quick how to on a microsquirt LS setup. I'm sure I've missed some details. I haven't gone into tuning at all because I don't want to claim to be some amazing tuner; I'm still learning that part of this too. If you use my basic settings your engine should fire up and from there, you can tweak it. With some basic research online you can get to the same level I'm at where your car runs great and makes good power! The key tool is a wideband O2 sensor that feedsback into your micro. The autotune function in the Ultra version of tuner studio works great when you're just getting your car setup and building a base map.
Let me know if you have any questions or feedback! Thanks and have fun!
Edit: "Just a correction that CLT and IAT should be wired to [sensor] ground, not 5V reference." Thanks to Adam Watson for the catch!
Disclaimer: This video is intended for educational and informational purposes only. It does not constitute professional advice or guidance on emissions compliance. Emissions regulations and requirements vary by region and jurisdiction, and they may change over time. Viewers are advised to thoroughly research and understand their local emissions laws and regulations before attempting any engine swap or modification that could impact emissions control systems. It is the responsibility of the viewer to ensure that any modifications made to their vehicle comply with applicable emissions standards and legal requirements. This video does not replace consultation with qualified professionals who have expertise in emissions regulations and automotive modifications. Any actions taken based on the information provided in this video are done at the viewer's own risk.

[@Munky332]

Really need to get around to buying a Micro for my 4.6 2v; my setup will be a bit different but in some ways the same, I rigged up some LS truck style coil packs, but I have a 36-1 trigger wheel; also LS is my throttle body (I know, mismash of LS and Ford parts, what am I doing with my life? lol). Where'd you get your MS from? They seem to have gone up in price a bit?

[@lsx434]

thanks for your video, and good working

[@darrenbaie3381]

Thanks for making this video. The way you broke this down in addition to sloppy's videos really helped me to decide to go with a micro squirt! Going to order it tomorrow and likely won't install for a bit but definitely going to follow this guide! Thanks!

[@dalemartinez6943]

This was an absolute pleasure to watch....was going to go with Fitech or Fast, but will now try the Microsquirt....

[@acedeuce802]

Nice video! Just a correction that CLT and IAT should be wired to ground, not 5V reference.

[@semirm8248]

Nice video. Do you run a fuse box?

[@matthewcraven3197]

Great info!

[@DongaRacing]

Hi, and how is the setup on the ALED and WLED for this? thanks...

[@sld30333]

Great Video!!! Is there a way you can share this tune(.msq) file with me?

[@rickstuck3729]

Is the microsquirt ms2 the same wiring as the sptronic model sem102b?

[@SloppyMechanics]

i appreciate you appreciating me, also Mike is THE MAN

[@donaldhampton4695]

This is EXACTLY what I needed!! Thank you!

[@GnarshredProductions]

thank you so much for this video it really shows step by step how to do it and thanks for giving the wiring diagrams for all the coils injectors and sensors. I couldnt find the wiring diagrams anywhere forums are filled with information but since photo bucket went down the shitter all pictures in those old posts are lost which sucks.

[@MonkeyFabGarage]

Very well put together video. Thanks

[@codycole8]

Sloppy is awesome! Thanks for the video!

[@jamesmaslonka5110]

Awesome video. Thanks. Just getting my 280Z painted and back together after 24 inches of water with Hurricane Harvey. I have a Spectre EMS-Pro I’m using to run fuel and spark with LS coils. If I’m correct, it’s a modified ms2 like the micro squirt. Your video is a big step to getting it wired. Thanks again.

[@matthewthornton8606]

Thanks, bud! This video made my day

[@the02WS6]

Awesome video man, thanks for making it. I just fired my turbo 5.3 on microsquirt and it is RICH... I didn’t have a wideband on it yet and I honestly just got it used from a guy on a ls marketplace and have no idea what tune is in it. Lol I tried to download one of sloppys tune from his cabinet but it says it won’t take it in tunerstudio. Idk I’ve got a lot of work to do before I get it smooth, but thanks so much for making this it helped me out a bunch.

[@matthewthornton8606]

Thanks!

[@robertbroderick3896]

Hi, great video! I about to order my micro squirt for my 2004 6.0 LQ4 swap into my 72 Nova naturally aspirated. I pulled a drive by cable throttle body off a junk yard motor to convert from the drive by wire Throttle body. Question about running the IAC with micro squirt. When you said " Your welcome! You can only do throttle by cable with a micro. The iac wiring is simply a seperate module which allows you to use a stepper iac which is essential to making it run nice :)" Where do I get or buy a IAC separate module? Sorry Im newbie confused. So is it just a way of wiring off the micro squirt or an actual separate IAC module "I have to buy somewhere" that works with the micro squirt? Thanks!