Thankfully the best solution is still very practical: convert the car back to a single 1 3/4" SU carb and eliminate the ECU. This opens up the entire universe of performance enhancements and upgrades that have been developed so successfully over the years.
The basic elements of the conversion process are simple enough: Remove the entire FI assembly and ECU, install a conventional 1 3/4" HIF series carb and manifold, replace the ECU with a simple relay, install a fuel pressure regulator and replace the distributor. Wire and plumb all of this together and you have it! Wiring and plumbing diagrams are provided in the kit.
Included in the kit are: 12-803 - Fuel Pressure Regulator A+ - Distributor 12B561 - Carb Spacer 22A152 - Stud, carb to manifold 2A3005 - carb abutment bracket 88g429 - carb gasket AJM601 - intake/exhaust manifold gasket AR201 - Relay C-AHT771 - Intake manifold CZK6491 - choke cable clip Fitting01 - 3/8X3/8 brass fittings Fitting02 - 5/16X3/8 brass fittings Fitting03 - 5/16X3/8 fitting with .100" hole FZX1280/rebuilt- HIF6/44 Carb SBB10126 - throttle cable SD40 - K&N Air Filter
The temperature gauge is no longer used with this conversion kit.
Weekley News from the Mini Mania Engine department
Carburation and Interchanges
What is the correct carburation that you should use on a Mini? The answer will depend on what size engine you have and what you are trying to achieve. Over the years, the factory used the SU type of carburation on the Mini. They used a wide range from the single 1.25" to the 1.75" to a duel set up. It is possible to interchange or upgrade to different size or styles of carbs, depending on manifold set up and engine size. Also, the Weber carburetor can be adapted to fit as well. We offer several upgrades and kits as well as new and rebuilt carbs that are all listed on our web site. When we build 1275/1380 engines in our shop, the majority of the time we and customers prefer the SU 1.75" HIF44 single carb. The SU carburetor is the best for reliability, longevity, and drivability, and retains the originality of the Mini. Our sales department can help with any upgrades and interchanges that would best fit your Mini.
We also have several articles you can read up on pertaining to carburation in the Mini.