right then all you ECU Guru's out there:

Ive heard the 1.1MPI ECU will run a 1.4 16v.

I.e it has a 3 bar fuel pump, knock sensor, coil packs, cam sensor and crank sensor.

I understand the fueling will be an issue so i will use a 1.2 16v ECU and get it mapped in the future.

However just want to see it up and running so not all my funds are going down the drain on it and it will give me the confidence to crack on.




How i want in the future.

1.4 16v engine
MK1 1.2 16v Inlet
1.6 Throttle body (Maybe ITB's in the future)
BMC CDA
SUPERSPRINT exhaust manifold
Cat back exhaust system (any recommendations)
Magnecor leads


Any more advice, tips much appreciated.


Cheers guys!!

Without detailed knowledge of the various engines and ECUs, here are my thoughts.

If the sensors and connections are the same, the ECU will attach and try to run the engine. It does not really care about the capacity, it just squirts fuel in and adjusts it according to the inputs from engine speed, crank angle and position, throttle opening, manifold pressure and temperature, engine temperature and lambda sensor(s). As it is programmed for a 1.1, it will pop some fuel in, but not get the results it expects. May be ok at idle and low speeds as, but as you rev it it will become more confused as the air intake and fuelling may not match. It can adjust, but only within narrow parameters. May be ok to test the engine, but not a good idea to put any load on the engine. If it runs weak, you can hole a piston.

Otherwise the manufacturers would use a one-size fits all ECU. So be careful.

I currently have a Sei MPi most of the way through a 1368cc 16v swap.

I can confirm that most of the connections are the same.

Key Issues are:

HT coils - Punto uses a 3-way connector on its coil pack, Sei has 2 x 2-ways.
MAP/IAT - Punto has a sensor with both of these in one. Sei has one too but I think the ranges may be different
Idle Stepper / TPS - my Punto Mk1 setup (which I think is actually a Brava TB) has a 6-way connector that as far as I can tell encompasses ICV and TPS functions. Need to find the Bravo/a Tech Manual and get pinouts for everything otherwise one false move could cook something.
CTS - No idea where this is yet, but apparently there is one and it has two pins. The Punto Mk1 item has 3 pins.

As for fuelling, in theory it should run it (as all you're doing is putting a bigger fuel valve on a bigger engine, not trying to squeeze more fuel into the same engine). Whether the ECU has enough control on the factory mapping to handle such a large photocopy engineering project is yet to be seen. Its probably something a rolling road could rectify if you pay them enough.

Im only using this as a temporary rig as I have a set of nice fat ITBs waiting and am planning a blown build.

tomo3292 said:

so i will use a 1.2 16v ECU and get it mapped in the future

Click to expand...

As long as you're talking about mk1 Punto ECU here, I didn't think this was an option??

I would first check and get definite confirmation that your choice of Ecu can be properly mapped and not just flashed with a generic map.
The other option is a DET3 with 1100 Ecu.
The 1100 Ecu does run it but not too good. The problem with using it is you will probably stick with it and never convert to another because it can be quite a job to convert the wiring yet again.

Converting the wiring on an mpi sei will be a bit of a nightmare so you're best off running the standard ecu and getting it remapped. This is assuming you don't have the micro ecu pretty much means game over.

You want the MK1 16v coil pack holder so you can run the standard pair of coil packs.

I know the MK1 16v TB works with the standard ecu as I ran one for a little while on my 1242 8v.

I believe the MAP sensor on the MK1 is different to the MPI one so maybe the 1.4 inlet with adapter plate for cable throttle body is a better option as that runs the later type MAP sensor.

Again, the later inlet has the correct coolant temp sensor, same as sei.

Cento186 said:

Converting the wiring on an mpi sei will be a bit of a nightmare so you're best off running the standard ecu and getting it remapped. This is assuming you don't have the micro ecu pretty much means game over.

Click to expand...

Wiring couldnt be easier. Everything is connector for connector excluding IAT / MAP, TPS and the coil packs (if youre not using the stock items) with a Mk1 inlet. VR sensors and OPS fit the same too. A fair few people have done pukka EMS swaps now (MS, DTA I think, Canems and Emerald) . I will report back on the Mk2 inlet compatibility as I havent looked!

Cento186 said:

You want the MK1 16v coil pack holder so you can run the standard pair of coil packs.

Click to expand...

I'm currently looking at cutting up an 8v one and seeing if I can make that fit. Will report back once done - looks like a good snug one. Failing that, I could use the Mk2 head on Punto single coil pack (as currently fitted) with a loom extension or with COPs (as the head's designed for and I have a set of) with a loom extension.

Cento186 said:

I believe the MAP sensor on the MK1 is different to the MPI one so maybe the 1.4 inlet with adapter plate for cable throttle body is a better option as that runs the later type MAP sensor.

Again, the later inlet has the correct coolant temp sensor, same as sei.

Click to expand...

This is useful... by different do you mean connector or ranges?

I have a Mk1 Sporting and a Mk2 1.4 Sporting inlet kicking around (I'm planning on ITBs before long!). I'll think of something I'm sure.

Also note that throttle cable length is an issue - I'm looking at getting an SPi throttle cable as the MPi one is a good 350mm too short!

cc1 said:

I would first check and get definite confirmation that your choice of Ecu can be properly mapped and not just flashed with a generic map.

Click to expand...

I've been poring at MCU code and amps for the last few evenings - you can pull the memories easy enough but the rub is really knowing where the maps are (which I don't, yet!). Once you know how everything sits in the memory actually remapping it is simple - it's just figuring out the layout that takes the time - and I dont possess any proper tools for the job (ie: WinOLS with a MM plug-in)

cc1 said:

The other option is a DET3 with 1100 Ecu.

Click to expand...

I'm keen to hear what experience people have had with these as they look in principle to be the golden bullet - and I find these things are usually not as rosy as they seem, and at £150 all in it almost seems too cheap to be right IYKWIM?

cc1 said:

The 1100 Ecu does run it but not too good. The problem with using it is you will probably stick with it and never convert to another because it can be quite a job to convert the wiring yet again.

Click to expand...

Provided I can get it home (2 mile run) and to the MOT station for a retest, that's me happy, as I'll be building another 1.4 up with ringed block and quite extensive thermal coating work to go in, which will require an entire revisit of the fuelling arrangements anyway (as it's having a turbo hung on there too).

arseofbox said:

Wiring couldnt be easier. Everything is connector for connector excluding IAT / MAP, TPS and the coil packs (if youre not using the stock items) with a Mk1 inlet.

Click to expand...

I was referring to converting it to MK1 16v ecu and wiring as mentioned.

The standard wiring is near identical to 16v so everything on engine side is just plug and play in effect.

arseofbox said:

I'm currently looking at cutting up an 8v one and seeing if I can make that fit. Will report back once done - looks like a good snug one. Failing that, I could use the Mk2 head on Punto single coil pack (as currently fitted) with a loom extension or with COPs (as the head's designed for and I have a set of) with a loom extension.

Click to expand...

Simply fitting a MK1 coil pack holder is by far the easiest option here.

arseofbox said:

This is useful... by different do you mean connector or ranges?

Click to expand...

I mean the sensor, in at least a physical sense, appears to be identical. I would make the assumption that it is in fact the same part. I see no reason why Fiat would have it any different.

arseofbox said:

Also note that throttle cable length is an issue - I'm looking at getting an SPi throttle cable as the MPi one is a good 350mm too short!

Click to expand...

Good idea I had to do the same when fitting the P75 engine due to the old 'spi type' throttle body.