6 replies to this topic

[Classicmini63]

So, I’m considering getting a megasquirt ecu for my MPI. Mostly because of the low price. I’ve been told they are DIY ecu’s and that they fit pretty much all cars.

Does this mean that I would have to wire it all in myself and so on?

My question is - are these ecu’s not just as simple as ‘plug and play’

Has anyone here fitted one to an MPI or other type of mini? If so, what is required to get it all together?

Cheers

[mini13]

yes you'll need to do a significant amount of wiring, as for a start the plug is different. I have seen some people on mx5's for example use an old ECU cut up to create an adaptor for the existiong loom.

 

Also.... the MPI is  a tricky beast to inject due to using 2 injectors to feed 4 cylinders.

[Classicmini63]

Ok thanks. So would it be a case of getting someone to wire it up/ adapt it to my existing plug/ and then it can be set up at a rolling road?

Thanks

[mini13]

unfortuunatly its a fair bit more complicated than that, and AFAIK no onme does a drom on ECU for the MPI,

 

Personally I have only done stuff where there is 1 injector per port ( 7 port head with megasquirt now going to a k1100 head), but the problem arises with trying to get the right mixture in each cylinder, which involves adding a 2nd lambda sensor, so you can monitor the inner and outer cylinders, and then skew the injector timings to get the mix right...

 

IMO its all a massive ball ache,and if I were doing it I would change the manifolding to somthing similar to the SC components setup where the injectors are at the throttle, then you can treat it like an "electronic carb" and maping becomes a whole lot easier. but kn idea how thats going to work with emisions tests.

 

over on the turbo minis forum a lot of work has been done on MS port injection, below is one of many threads, this should ilustrate the potential head ache

 

http://www.turbomini...tid=528171&fr=0

 

another what that Specialist components were looking at going was to "convert" the a series to direct injection, like the modern eco boost engines, so you actually inject into the cylinder, which was an interesting prospect, but i think this may have been shelved.

[Classicmini63]

Thanks a lot for all that.
Think I’ll just leave it haha ?

[Sprocket]

What have you done to the engine to justify anything other than the factory ECU?

[Classicmini63]

Stage 4 head, 52mm throttle body, K&N induction kit, ported and polished inlet manifold, SW5 Cam, racing followers, stage 2 maniflow downpipe.

It pulls so much better than before and is a hoot to drive now, but I just feel as though despite the obvious performance benefits the car has (don’t get me wrong, I love it and I’m more than satisfied with the engine mods I’ve done) but I can’t help feel a stand-alone ecu would unlock some of the potential the current ecu is most likely holding back.

Cheers.