I'm asking this a generic question and nothing much to-do with fords...

How could you go about reading the maps off a std ECU?

Say for example a Rover MEMS system that you want to replace with megasquirt. Instead of starting from strach would it be of any benifit to work out what the std mapping is and then work backwards with the new ECU from there?

If so, how?

Alex

 

Build a box that simulates an engine and can record the ignition and fueling outputs from it, then generate the table from this data.

Thats my suggestion anyway

 

Its possible and can be helpfull of course but it depends what system we are talking about Alex.

Rover mems is a really poor system and depending on the ecu type it may not be possible to get a decent complete map from it.

More details of plan hatching required

 

This is exactly what I did in the early days of secs ecu development!

I have a box simulates weber and EEC4 engines and a recording device
that automatically "drives" the ecu and records all data.
Takes about 15 minutes to do every permutation of driving conditions.
Its not 100% perfect but it now allows me to get map files for people
that now buy my own version S8 ecu and allows them to do a true
plug and play.

Stu is so right, rover mems is no good to say the least

 

Rover MEMS SPi on a mini from say 1994...

Plan is to replace it with a slightly more mapable MegaSquirt.

Its not impossible to build a map from scratch, but if you can get a leg up then so much the better!

After SPi I want to look at MPi.. which is a WHOLE different ball game as you have 2 injectors, 2 ports but 4 cylinders! The way rover get round the charge robbing on the siamese ports is not a simple one, or so they say!!!

Enough detail stu?

Alex

 

Rovers never seem to run right even when they are running right!

 

Alex, doesnt megasquirt batch fire anyway?

As only 1 & 2 or 3 & 4 would be firing at once, id imagine charge stealing wouldent b a problem as such? *trying to get his head around whats happening* !

On the MS youd just wire one injector instead of two (as they are driven byt eh same ecu pin), and it'd work ok?

 

MS is batch only but thats no issue

Spi only have one injector, Mpis have 2!!!

Alex

 

Ahh

 

phil, the problem is...

http://www.planet.eon.net/~chichm/efi/siamese.htm

 

alex, the way i was planning on doing it with mine, was to contact a tuner thats written a "chip" for my engine...

presumably somewhere they would have written down a map thats useable, since they wrote the chipped map in the 1st place...

might we worth trying superchips, or any mini specialists? they might have somethng on file...

saves you having to do yourself what other have previously done

 

This rover siamesed port charge robbing problem is a very difficult thing to get around.
I have actually studied how rover get around this and it IS a pain in the arse
to set up.

You will have problems using an aftermarket ecu on this engine type using
standard multipoint injection techniques.
Especially on a simple system like megasquirt.

There are companys out there who DO remap the rover ecu's but I dont
have any details.

Unichip may be an alternative .....

 

I know the Emerald system has been used on the siamese port Rover heads.....

 

http://www.emeraldm3d.com/em_projects_Aseries.html

 

Forgot about that ecu. (Haynes manual by dave walker )

The emerald system was designed originally for rover MEMS replacment !!!!

 

I have that book...damn good read!

 

Jim,

If it wasnt so hard everyone would offer chips.. as no one does!!

But theres nothing like a challange...

Secs,

could you ellaborate who they got round it? PM or msn if ya prefer!

Daz,

The got round it by runing a SPi system... which is what I already have! The MPi stuff is the hard one.

Alex

 

J871yhk,
I do like a challenge but it would be uneconomical for me to even think about doing this
plus I dont get much time to do these things lately.
It would be a bitch to set up initially and if I am honest I have no interest
in this market as others have already sewn it up!

The problem is solved by having differing injector durations for the same load
(normally all the same) and changing the phasing and/or injection
start poinjt for the port in question.
Its nasty !!!!

 

I can imagin... and there is very little money in minis...

but I fancy a crack.

How do you mean "differing injector durations for the same load"?

Alex

 

One technique is to change the firing order and/or the point the injector
starts to inject during crank rotataion to suit the valve opening and port
airflow characteristics based on rpm/load.
As I said, its a pain to understand let alone do !!!

I would speak to emerald about this as they have HUGE experience in this field.

 

changing the firing order wont help...

I've modeled both 1342 and 1243 but that doesnt change the 5 port problem!

The only solution I can see mechanically is a bi plane crank (as opposed to the current flat plane one). But I havent got the skilled needed to modle that properly in solidworks/catia/proE.

So MEMS isnt as shite as everyone says... except you cant reprogram it easily!!??

Alex

 

J871yhk, This is why i said a unichip may be you best solution !!!

It keeps the mems system which sorts out all the fuelling issues and allows
live remapping !
One disadvantage with unichip is that you CANNOT raise the rev limit of your engine.

 

I've been unimpressed with the results I have seen from unichip on minis... but I suppose alot of that could come down to the mapper... and of course the spec/build!!

alex

 

J871yhk, Not to mention the lack of turbo

 

lol lack?

who says


alex