rx-freak

Has anyone used a megasquirt ecu for a T2 swap into an FB. If so, what unit did you use, and how do you like it? Did you still need the factory ecu, and wire harness? What else did you need to install the system?

trochoid

iTrader: (6)

There hasn't been much chatter in the 1st gen forum on the MS. We do have an MS section under the engine management forum and rotarys have thier own section on the big MS forum. I'll be looking at the MS for my swap, but as yet have not researched it.

rx-freak

Thanks man, I just want this swap to go as smooth as possible.

renns

I'm running MS in my 13BT-powered SA, and ran it on my FC as well. It's not a plug-n-play solution by any means, but if you enjoy that sort of thing, it can be very rewarding.

I ran it in piggyback mode on my FC, leaving the stock ecu to control spark. On the SA I built a new harness, and MS controls fuel and spark. To run the stock T2 engine you can get away with a virtually stock V3.0 MS box by modifying the CAS. See the V3.0 build thread of mine in the MS forum for details of what's involved.

I'd recommend buying a kit and building your own. Buying a pre-built unit leaves you feeling helpless when you want to modify/upgrade/troubleshoot. If you'd rather not get that involved in an ecu project, then either a commercial unit, or the stock T2 ecu and harness will likely be a better choice. Also consider also who will install and tune the unit. If you plan to hire that out, then pick an ecu that is well supported locally.

rx-freak

I am actually planning on having the work done since I no longer have a garage to work in. Everyone I called to do the install recommended that I buy a programable unit like this one. "Apparently" it will save time during the install. If I didn't use the MS system, what would you recommend?

rx-freak

Wow, your thread on the MS forum really cleared alot of things up. Good work man, thanks alot! I think you may have inspired me to buy a MS ecu and build it myself. The only thing I can't figure out is the CAS. Could you send me more pics?

renns

The V3.0 MS can read a 'missing tooth' timing wheel directly. The stock CAS is not a missing tooth type, as it uses a second VR sensor and the 2-tooth wheel to give TDC info to the ecu. To interface the MS, there are two options: 1.) Build another VR sensor signal conditioning circuit on the proto area of the circuit board and use stock CAS, 2.) Use the stock MS and modify the lower toothed wheel by removing opposite teeth. We need to remove two opposite teeth as the CAS turns one rev for every 2 revs of the e-shaft. The 'how-to' for tooth removal is here:
https://www.rx7club.com/megasquirt-forum-153/removed-cas-teeth-pics-511349/

rx-freak

Cool, thanks man.You realy cleared alot of stuff up for me. I think I am now ready to take on this project.