MegaSquirt-II (v3 pcb) and boost control
Turbo Mini Forums

Ok im a megasquirt retard

After looking at Bretts thread its got me thinking apart replacing my megajolt for something that I can datalog with.

I would want to run the unit but no fuel control (obviously), but then what do i need to add to make it control boost?

Any help put into idiots terms would be most appreciated!!

Do i need this http://www.diyautotune.com/catalog/pcbv3-a...dkit-p-160.html, a solenoid and some wires?

thats about the size of it Nic,

you should down load tuner studio (the tuning interface) and have a look.

http://www.efianalytics.com/TunerStudio/

you can map the boost against rpm and throttle position.

Buy VEMS and get Wideband, EGT and SD card datalogging too

I expect Megasquirt will do the same, but VEMS also has gear/ boost.

Runs fir cover:$

Edited by Sprocket on 1st Mar, 2010.

lol,

fair points, especially if you are elecronically challenged,

I'd say if you intend sticking a K head on go with VEMS, if you want to push the 5 port and go to injection go MS.

Theres no way a 16v head will be going on my car

lol

Also its worth considering that BAT does looms for VEMS, ok they are for the K head, but wont be using the injector part (or could use it for a 7 port)

Bat would build a custom loom for Nic with only that he requires. TBH its nothing taxing, its just a matter of ticking the right boxes on the order form.

Don't forget that you can now do traction control with MS even if only using it for ignition.

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."

Argh another spanner gets thrown into the works!

I have no problem with the loom, but all of this circuitry nonsense and different versions of the megasquirt has lost me slightly

it is quite confusing,

essentally (IMO) though it comes down to two choices,

siamese code (beta), or the latest MS2 extra release code.

you can then configure whatever hardware (sensors etc) you have/can get hold of to work.

once you actually look at the circuit schematics of the pcb theres suprizingly not that much there that you have to worry about,

in your case mainly the crank sensor,

tps, coolant, MAT & boost sensors will be genric or just a change in settings.

you have no idle valve to worry about, no injectors,

anyway, theres enough people on here that are familiar with it if you do get stuck.

If i built it with the MS2 code and then wanted to go injection later is it a case of flashing the chip for the different codings, or are they built differently?

Is there any disadvantage for using the siamese code? will it stop me being able to do anything?

The code you would use would be the MS2-Extra code anyway. The siamese code is now effectively a part of the Extra code so whether you just want ignition plus boost control, launch, etc, it's all there.

The only differences in the build are minor with respect to ignition (ie, coil, coilpack, or COP/CNP) and more significant with respect to fuel injection (single injectors, multiple injectors, staged injection, low Z vs high Z) but with the more significant injection options they can all be backfitted later.

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

If you just want boost control and datalogging, then you could just get an Apexi AVC-R and an electronic dash with a data-logger built in.

You don't want to think about using injection. It's too complicated, it won't make any more power plus it will make my task of beating you harder

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."

The trouble with the MSII boost control is that it is rpm based. What we really need is gear based boost control.

Gear based boost control will be available with the MS3 version currently in development but that may not include the Siamese options.

On the Miglia we are going to start with using the MS but will probably upgrade to the APEXI.

Of course there is always the possibility that we will not need boost control if the traction control is effective.

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."

Gear-based boost control is likely to make it to MS2/Extra. Also, it is planned to have siamese-port options on MS3 but it may not be right from the start.

However, I'm not sure MS3 will bring that much more to justify the cost difference but that may change as development progresses.

Jean

http://www.jbperf.com/

Did you get any further with this ?
A quick question, will all Megasquirts work with my current 36-1 trigger wheel & edis setup from my megajolt, so I can just swop the ECU's over ?

WWW.TURBO-MINI.COM

On our test bed i can see the boost control working depending on rpm.

In theory you can just swap them over with a few additional sensors but personally i'd ditch the edis and drive the coilpack directly, this will give you lots more features to play with :)

Great thanks. So do I need a certain version to be able to do this ?

WWW.TURBO-MINI.COM

no,

just the right code and extra coil driver chips, VB921's or BIP???

I think i have some VB921's I could send up with my head Phil, I'll look tonight

Edited by Joe C on 3rd Aug, 2010.

Edited by Rod S on 3rd Aug, 2010.

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

WWW.TURBO-MINI.COM

Ill eaves drop on this conversation!

No Probs,

If i get time i'll pull my ecu and bring it along.