MegaSquirt for 7 Port
Turbo Mini Forums

Hi Guys,

Im currently planning my alloy 7 port build, Im going to be running a custom alloy welded plenum and a single throttle body, using T2 turbo, 12psi boost @ 9-1CR. etc. This is my first attempt at injection, so my knowledge is very limited.

Ive been looking at different ECU's, but it seems alot of people on there are using MSquirt, Ive been on there website but not sure which ecu is best suited. Im also concerned that my rolling road is not familar with MS.

Whats the advantages / disadvantages of the Mega Squirt system.

Do you have to build your own?, Are they easy to work with?, Does it work with my Ford coil Pack/ Edis?


Thanks Matt

Edited by alaskanow0 on 24th Jul, 2011.

Class C 3rd Place Avon 2011 14.18 @101mph

The Megasquirt ECU was originally developed for DIY use based on fairly simple batch injection.

But it has long since evolved....

There is still a fair bit of DIY involved but the MS2 with simple modifications will run fully sequential injection for any 7/8 port engine.

Some of us are using it with the MS2-Extra siamese code that Jean wrote specifically for the 5 port engine but once the small modification is done to the CPU daughterboard it does sequential on either 5 port or 7/8 port.

Beyond that there is MS3 (which Paul is now using) that gives 8 channels (7/8 port sequential staged injection).

If you stick with MS2,

Avantages - will run fully sequential on 5 port (siamese code) or 7/8 port (normal sequential). also much cheaper than any of the other so long as you accept a fair amount of DIY needed.
It can also be built to run 4 channel low z injectors.

Disadvantage - need for some DIY to release the full potential.

You don't have to build your own but there are only a couple of (reputable) people in the UK who build them and you would need to specify the "extras" that you need.

If built to do so, it runs the normal Ford coilpack withOUT an EDIS module, it just drives the coilpack direct (or COP or anything else...)

Have a look here.

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=408438

Schrödinger's cat - so which one am I ???

Thanks Rod, Ive just read Paul's execellent write up. Just got a couple of questions;- Will the 7 Port be batched, semi or fully sequential. I was planning on running just Crank sensor pickup. If only batch, how do I install a cam sensor? Is sequential more superior? Does MS have control boost based on revs / gear?

Thanks Matt

Edited by alaskanow0 on 24th Jul, 2011.

Class C 3rd Place Avon 2011 14.18 @101mph

I wrote most of that..... Paul just took the credit :) :)

You can't do fully sequential (5 port siamese or 7/8 port sequential) without a cam (phase sensor).

If you have an MPI block/cam it's already there but the simple DIY solution for the majority of engines is a Hall switch or opto switch in a cut down dizzy. Paul's latest version is a hall switch built into the back of the timing chain case (looking at the big sprocket) but the modified dizzy case is probably the simplest answer.

Schrödinger's cat - so which one am I ???

We are moving everything over to MS3X in due course. You can buy one of these fully assembled from diyautotune for $640.

If you plan on using the ford coil pack you'll also need one of the external spark driver boxes, available from people on msextra i believe. We have chosen to go with Coil Near Plug so drive them directly form the MS.

With the MS3X you get almost any feature you could want out of the box. launch control, gear dependant boost control, traction control, progressive nitrous, switchable tables, anti-lag, all without any modifications. They also have programmable outputs so can drive fans, pumps, or anything you can think of under a certain condition (for example coolant above 80 degrees)

Also another brucey bonus is the msextra forum, a huge knowledgebase as MS's are so widely used across the world, if you want to know how to do something, odds are its alerady been done so just search.

The software (TunerStudio) is easy to use, and like all other systems has tables for ignition, and fuel. Any RR that wont work with the software is most likely trying to sell you something.

Sorry Rod, Your execellent write up . Can you recommend were to buy one built and what features i will require. I like the idea of twin lambda, as i have a spare AEM gauge kit & been wondering if the outer cylinder would run richer, due to raduis of port. I fancy the DTA S80 for the datalogging, but not for £1k. If I ditch the Ford Coil pack from my megajolt, what coil do I need?

Class C 3rd Place Avon 2011 14.18 @101mph

On 24th Jul, 2011 alaskanow0 said:
Sorry Rod, Your execellent write up .

Schrödinger's cat - so which one am I ???

Also the MS3 can datalog to an SD card :cool:

Glad you said that :)

On 24th Jul, 2011 Rod S said:

On 24th Jul, 2011 alaskanow0 said:
Sorry Rod, Your execellent write up .

I was only joking, Paul and I have been working on the "build guide" together.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."