I understand I will have to provide a case to fit the fit the MYECU into, what else is required.  I don't want to destroy my original Marelli ecu. I have seen mention of the original  air pressure sensor being moved to the MYECU and of needing a special connector.  I have a 2004 V11Lemans fitted with the WM15M ecu, there does not seem to be any special plug, just rows of soldered in pins.

Normally you need the pressure sensor, the main ECU connector and the case from the donor ECU.
Alternatively you can source the parts as Luhbo suggests.

I source my donor ECUs from ebay and you can check your local Guzzi/Ducati dealer. They may have dead ones lying around.

I guess it's not too uncommon people buy a MyECU because the OEM went tits up. Then there is already a case, connector and a pressure sensor waiting to be recycled.

Many thanks for explaining, I will now start looking around for an old WM15M.

Thanks for your kind words.

I now have a second hand IAW15M.A8 ecu from a Ducati 900ie.

Please confirm this is acceptable before I rip it apart and order a MY15M and Optimiser.

I have also obtained a used standard V11 exhaust cross-over pipe with an O2 sensor fitted, assuming this is an original Guzzi part, is this usable.

I am wondering if I can fit this crossover and use it to moniter the A/F ratio at present with the stock ecu, I do not intend to connect the sensor to the ecu - rather to use it as a stand-alone device.  I understand these sensors operate around the one volt area, perhaps I can use a multimeter and then use a conversion chart. I have seen A/F gauges but suspect they are just voltmeters.

Alternativly perhaps I could use some form of data logger - although this is perhaps moving into unknown territory for me. Anyone know of any kits, either for an XP etbook or an old HP Compaq 3970 PDA running Windows Mobile 2003 with a USB interface.

I have built a few electronic kits over the years so feel reasonably confident.

I have now taken the lid of the spare WM15M, fairly easy if you take time to allow the sealant to separate.

The Air Pressure Sensor is a fairly common MPXA4115A, a web search suggests it is probably a Motorola part although other companies also list it, about £16 including postage from China on Ebay. It turns up in varies projects to build weather stations and suchlike.

As the plug is also available I am now unsure if I should strip this ecu or find an alloy diecast box and build it up from there. I need to measure up the space on the bike. (2004 Guzzi V11 Le Mans Rosso Corsa.)

I take the point about heatsinks and RF/static shielding.

The oem circuit board is mounted on thin insulated shims, none of the components are directly against the case.  Most of the components are on the lower surface of the circuit board with no airgap to allow the heat to rise to the finned side of the box, so I expect Magnetti Marelli were not too worried about heat buildup.  I wonder if the fins are for show. My VW Passat ecu has no fins and sits inside a plastic box so not likely to be well cooled. Still may be a good idea to find a box with fins or screw some fins on.

I first came across the RF shielding problem some years ago during a engineering production meeting when the designer mentioned HIRF -hi intensity radiated field....I thought he had a speech impediment and was worried about static bonding!

The box has of course to be vented to atsmosphere for the pressure sensor, the little black round plastic thing on the top of the oem case seems to be a simple vent with a filter to discourage dampness.

Looking at the MYECU website suggests I may be a little too late to the party, hopefully my comments may be of use to other newbies.  I wonder if more interest may be developed as the bikes grow a little older and cheaper - less resistance to tinkering with them.

Perhaps Cliff could add an update to the MYECU website to show it is still a live project and hi-light the forum.

Don't think you need to use that plastic caulk, Cliff suggested using a hot glue gun to hold things in place, I also see much use of that in the photos of the Optimiser.

This can be found under:

MyECU > MyECU Kit Construction > My15M and Optimiser now working.

(Is there a sinpler way of refering to another post? )

Thanks for the replies.  I'll cut if off and desolder.