Jan 22, 2012

Megasquirt 3 Wiring Help LM7 / LS1 / LS

Well its been a while since I posted last. I’m going to make it a priority to post more frequently now that things are speeding back up on the project. I’ve been making steady progress but just had things slow down a lot when it came to getting the motor running on the Megasquirt 3 and assembling the Megasquirt 3.

Here are some links that should help you wire up a LM7 (LS 5.3L) or LS series motor to a MS3 with MS3X (Megasquirt 3 with Expansion for sequential fuel injection).

Step 1) Decide which manual is correct for your engine (24x reluctor engine or 58x reluctor engine)

http://www.msextra.com/doc/ms3/ls1.html

http://www.msextra.com/doc/ms3/ls2.html

Misc Info on LS engines very helpful site

http://chevythunder.com/ls1_page_1.htm

Step 2) Run all the correct wires to your engine. If you buy the DIYAutoTune harness it comes with the wires pre labeled def worth the ~$160 bucks.

Step 3) When it comes to wiring up your ignition if you want to use the parent (7 or 8pin I forget plug) for cleanness it connects to all 4 ignition coils. There are one of these parent plugs (on top of the valve cover) on each side of the motor and each one runs to 4 ignition coils.  Look at this diagram for help in wiring those up.

I cant remember of the top of the head which ones I had to use.

Even Ignition Coil Diagram:

c149evencoilssub

Odd Ignition Coil Diagram

c148oddcoilssub

That should get you going in the right direction. Here is a pic of my motor fully wired up on the stand. It’s got a fuel pump and is pretty much ready to start.

IMG_0791

My next post will talk about how I built a little Arduino (microcontroller) that controls relays over bluetooth. This will allow me to remove start the engine and control relays from a bluetooth device like a phone or tablet. Thanks!

35 comments:

  1. It's looking good man. I like the way it is coming together. Do you have any update pictures since January??

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  2. Yeah I will post some new pictures soon. I've been lazy about the blog this year and I need to write a bunch of posts to bring it up to speed.

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