Hi all I have been getting more and more questions about Megasquirt lately. So I am going to create a thread to help everyone out and answer some generic questions.
My background on this I have been running Megasquirt since 2006. I have a pretty good understanding of it and what it takes to install and run most engines. Right now I currently run Megasquirt 2 v3.57, 2.1.0d Extra code, and EDIS 6 for ignition control. This is installed on my 1990 toyota supra with a 1JZ.
Go here for you basic questions about Megasquirt that is not specific towards the supra and M/JZ series motors. I'll be going for more a specific questions aimed towards Supras.
Guess I can start with some Q&A here
Q: How hard is Megasquirt to install on XM/JZ motor and is their a PnP version available?
A: How hard something to install depends on anyone's knowledge and technical expertise. Now I am not going to say anyone can do but with reading and research I believe any person with the right skill set and patients can install it. I started out knowing nothing about MS or standalones when I started and with no one around to help me just the MS forums and manuals. Now www.diyautotune.com builds a DIY PnP MS2 for the 7M engine but it is not Plug and Play you still have to do some soldering and research to get it running.
Q: Can I use all the stock sensors with the MS2?
A: Yes and no on this question. You can use all the stock sensors with certain modifications done to the MS2 it self such as to read the 7Ms stock CPS. On the JZ series of motors the MS will not work with the stock ignitor so you have to find another solution for ignition control.
Q: Can I pay someone to install and tune the MS for me?
A: Now there is some people that do MS installs but not that many because the MS was originally developed for the do it yourselfer. Typically people who do MS is for people who don't want to spend a whole lot of money or like to do things for themselves.
Q: How does MS compare to other standalones out there?
A: Now I can't answer this question completely because I haven't used anything else but MS. For the money you can't beat it but it does have its drawbacks of if you run into issues you may not have anyone local to help you solve your problems.
This should be good for now If anyone has a question or any helpful information please ask or add to it! I'll add any good questions with answers to the thread that come up.
Alright here I'll explain prolly the easier ways of doing ignition on the 7m and then on the 1JZ/2JZ.
Ok the 7m ignition system uses and dual trigger 24-tooth/ 1 tooth trigger setup which is known for causing issues due to brittle wire. Then there is the ignition module which drives the three coils in a wasted spark configuration of cylinders 1-6, 3-4, 2-5. Now it is possible to run the stock 7m ignition system but with some electrical mods done to the MS unit itself which maybe be easy for some and not others.
Alright one way is to do the mods to the MS ecu and run the stock ignition system which is going to be hard for most people.
Now the one I recommend is using EDIS-6 from a ford mid 90's V6. Now the MS2 ECUs from Diyautotune.com already come setup for EDIS use. EDIS is very reliable ignition system to use and is pretty easy to get a hold of the components required to install it from most junk yards. It will also fire the stock coil packs and IS300 coil packs. There is some wiring that has to be done to install it. The hardest part of the install is installing the 36-1 trigger wheel and VR sensor on the crank pulley. The nice thing about using a crank trigger is you can get rid of the stock CPS and plug the hole with a freeze plug. Only drawback is controls such as 2-step launch won't work. Things needed for this install is below.
EDIS-6 Modules + pigtail
36-1 trigger wheel mounted to the crank pulley
Next would be modifying the stock CPS to a 24-1 trigger wheel as linked below. Now what you can do here is using the stock CPS modified to the 24-1 trigger wheel and drive Bosch ignitors or a Mitsubishi v6 ignitors. I haven't done this type of install yet but it is supported by MS2 and from what I heard works well. This wouldn't be a real hard task to do since it will require some wiring to do also.
I'll do the 1JZ/2JZ section later.
Now you can use the stock wiring harness which I don't recommend. I would use the Megasquirt 12' labeled wiring harness and do a custom harness which looks really nice and isn't hard to do if you can strip and connect wires.
I'll add more later.
The 7m electronic fuel system is a semi sequential fueling which fires injectors 1-6, 3-4, 2-5 as same as a waste spark setup. MS2 out of the box supports only batch firing which would allow you to fire two banks of injectors instead of three like the stock supra ecu does. Now you may think this is a down grade but really isn't batch firing works just fine its all in the tune.
Here is a write-up a friend of mine did to modify the stock CPS to a 24-1 missing tooth wheel MS can easily read.