How to MegaSquirt your NA MKI Toyota MR2

7 Sep 2014 | Author: | Comments Off on How to MegaSquirt your NA MKI Toyota MR2


or other Toyota VAST Ignition Vehicle)

Updated 4/20/2011 New plug and play engine management available!

Want to make your install as easy as possible? We’ve just introduced a MegaSquirt PNP for these cars! This is a fully assembled, plug and play, ready to run unit that makes installing MegaSquirt a snap.

Click here for MSPNP installation instructions. and you can order them here. For those who’d rather set this up the classic DIY way, read on.



The USDM 4ag bluetop motor works great with the MegaSquirt- it uses the Toyota VAST ignition system, and it’s easy to control. I run this on my MR2 with a harness adaptor I built up using the documentation in this message, and many others have built the harness adaptors and successfully ‘squirted their 4ag’s and 22r’s with this doc as well. I don’t offer a ready built harness as they are a bit labor intensive, which is fine for a one-off, horrible for a business ;).

There was a guy who does this but I’ve had to help a couple of his customers ‘fix’ their adaptor harnesses due to improper wiring that damaged their MS CPUs— I recommend building the adapter yourself so I’ll give you all the info you could possibly need to do so here.

Which Platform?

First off you’ve got to decide which hardware and firmware you want to go with. What are your priorities?

Cheap and very functional? The MS-I PCB2.2 running the MSnS-E firmware will do the trick just fine.

Robust and Upgradeable? The MS-I PCB3.0 running the MSnS-E firmware will do great and is built on the latest PCB with several new features for added robustness. (Basically it’s much harder to blow it up) It also has a longer lifespan from an upgrade perspective due to the newer PCB.

Robust and ‘Latest Greatest’? The MS-II PCBv3.0 is built on the same new robust/upgradeable circuit board, and uses the new MS-II processor which is much faster and the focus of rapid code development as we move forward.

OPTION A: Cheap and functional. The MS-1 PCB2.2 with MSnS-E firmware.

There’s no need for me to recreate the wheel here, Jamesl, the pioneer of this implementation of the MegaSquirt and the creation of the VAST PnP Wiring Harness Adapter, thoroughly documented this process back in late 2004. One week later I had my 86 MR2 running on a MegaSquirt-I PCBv2.2 by following Jame’s documentation to the letter. He was shocked that it worked as well as it did, and all I could say was thanks. ) Since then he’s brushed it up further and made some improvements for clarity and such. If you’re running a MS-1 PCB2.2 you can go straight to the original source here:

Note that the above linked map is best used with 024s9 as noted, the tables are setup for boost BUT NOT TUNED FOR BOOST . Use this as a base map and expect to do some tuning to get it just right for your car. And as always, USE THIS MAP AT YOUR OWN RISK !

YOU are responsible for tuning your car, this may help you though.

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