9 replies to this topic

[Cian 'the pain' MPI]

Hi there i was just reading a post about modding and Spi and the dude replaced the Ecu with an other rover GTA Ecu would this be possible for an MPI?, and also can i upgrade the injectors with bigger ones from a rover 220 for example, any other ideas or similar mods would be appreaciated

Edited by Cian 'the pain' MPI, 14 June 2008 - 05:28 PM.

[DaveRob]

why would you want to do this......... the only reason for change is that the engine I am building has WAY more BHP than standard..... if your engine dont need it your ECU wont make a blind bit of difference..... what the standard ECU does is keep the fuel mix right.... it doesnt 'make' more power. If you have bigger injectors they wont 'make' more power they just wont turn on for as long a time....so you get the same result.... for spending ....well my injector was about £160 new....and you have 2 of them..... If you dont have the other bits then changing ECU / injs will give you the same result as you have now..... or more problems to deal with.

Rob

[Cian 'the pain' MPI]

why would you want to do this......... the only reason for change is that the engine I am building has WAY more BHP than standard..... if your engine dont need it your ECU wont make a blind bit of difference..... what the standard ECU does is keep the fuel mix right.... it doesnt 'make' more power. If you have bigger injectors they wont 'make' more power they just wont turn on for as long a time....so you get the same result.... for spending ....well my injector was about £160 new....and you have 2 of them..... If you dont have the other bits then changing ECU / injs will give you the same result as you have now..... or more problems to deal with.

Rob

Thanks rob AKA the voice of reason im just looking for more power without taking the engine out and i have exhausted all other avenues, i have fitted a 52mm throttle body etc, so i think i will head for a stage 3 kit

[DaveRob]

[email protected] a list of what you have now in terms of spec would help us all chip in with modifications that would compliment what you have now....... and rather than tell us that you have a stage (insert number here)..... break it down into what you ACTUALLY have,....... I made a point in some other post on here.....you cant just buy it and bolt it on if you are looking for the best result.... all the other assembly processes need taking care of.... the best materials the right assembly lubes.....

I would be surprised , given the amount of discussions about cam changes on this forum, if the amount of camshaft sales actually equally the amount of cam bearing sales.....or oil pump sales.... It has amazed me all these people talking about cam changes........ and if you spend ages doing a search you wont find many questions about changing gallery plugs.... or where to get them..... or what size tap you need if you go for changables....

Just my thoughts tho.....

Tell us what you have and we can all put our ideas forward as to how WE would take the next step.

Hope this helps

Rob

[Sprocket]

This is an easy one

There is no other alternative to the MPI ECU you are stuck with what you got.

As for tthe 52mm throttle body. This does nothing tto improve performance. Throttle response will improve, but you could do the same by stamping on tthe pedal a litle harder. All it does is casue the inlet tract to reach 100kpa sooner. I'll bet that at 50% throttle and low revs annd aboutt 70% throtttle at high revs you will be at 100kpa, so what does the exra 50% or 30% do? Nothing!

I keep saying this about the 52mm TB, as do Minispares, but no one seems to care

If you want power from the MPI, you are going to finnd it hard to get 90bhp. That would need the best cylinder head you cann get, a decent injection cam shaft properly ttimed for thee MPi, 1.5:1 rockers, Power boost pressure regulator and the Superchips Icon Race ignition module


Of all the engines, the MPI is the hardest to tune of them all, it has to do with the way it injects the fuel

[Cian 'the pain' MPI]

Hey guys at the car hase got a stage one kit (K&N filter, Janspeed LCB, stainless steel DTM) with a 52mm throttle body and decat pipe, i think im goin to go for a rebuild within the next 12 months and as you guys said, change the cam etc, im just looking for more power but not comprimising reliability, the MPI seems to be inhibited by the ECU and this barrier of 90BHP a possible probramabble ECU may be a good option to go for such as an Emerald? Just looking for advice before taking the leap and getting the engine out

Edited by Cian 'the pain' MPI, 15 June 2008 - 10:54 AM.

[minicooper1.3i]

Can I just through the name 'Canems' into the discussion here? They seem to be doing some great stuff with programmable ECU's for Minis. I came across there name months ago whilst researching modding my MPi. I think they're mainly about converting carbed Mini's to injection, especially based on their recent Mini World cover, but does anyone know if they've tackeled 'the' MPi problem yet?

Bet it'd be a doddle for 'em!

[Sprocket]

CANEMS will work with the MPi manifolds, that was one of its main purposes. However!! Dont think that its going to be a straight swap. Its my own opinion that the design strategy of the ECU got lost some where in the making. Please do not think that with that statemet, I am saying its no good, I am not. What i do mean is that if you were designing a system, that can make use of a complete bolt on injection manifold, that you would be able to use everything on that mannifold, not the case with CANEMS. It does not have a stepper driver circuit, so you have to retro fit with a PWM idle valve.

One thing I am a little concerned with is the differences in AFR between cylinders that still exists. Its probibly good enough for you not to notice when you drive, but surely has to be loosing you some bananas somewhere?

As of current, CANEMS is the only option of a programable unit for the MPI, all others wont come close. Some have tried and failed. Some are still trying.

If you want programable ecu on an MPi, the easiest way would be fit an SPi manifold, you'll still get good results and the emissions limits are still the same which does seem odd considering the expense rover went to to reduce tthese by developing the MPi sett up

[perryman1001]

Sorry to bring this thread back up again but im just wondering what you think is the best cylinder head you can buy for an mpi? I'm looking at the superchips website and it only says how much the module is. Does anyone know how much fitting would be roughly? Any other help would be great

[tony kenobi]

im going for a stage 3. go for a stage 4 if your boring out to 1380 etc.
From MED or Morspeed etc.if you try the search, youll find similar topics in the past! Infact great ones that go into detail on what is best for the MPI and how much you can get from it.