Technical question, converting spi to mpi

[whitz]

as titles says im wondering how you would go about converting a car from spi to mpi, im guessing you would need ecu wiring etc

what would be the cheapest way?
also
what would be the easiest way?

 

[craigb244]

why do you want mpi?

 

[whitz]

why do you want mpi?

ive been thinking of it over the last few days and its just been bugging me to be honest

and to gain some knowledge on it

 

[rallycinq]

The MPi system is no more powerful, it was introduced to lower emissions.

Unless you are going to use a custom ECU there is very little point in changing.

Cheers

SPD

 

[AppleSei]

In fact the SPI is slightly faster top end

 

[whitz]

im coming along the lines of dropping a newer engine in that would be mpi rather then a spi

 

[rallycinq]

If this is a cento engine you could keep your existing head and SPI, or make sure you get the loom and ECU, and the immobiliser and the keys and the locks.

Cheers

SPD

 

[craigb244]

ad RC said or you can match the ports on the spi manifold to match the mpi head. it actually works out better due to the larger ports on the mpi head.
The bottom bolts match up but the upper are higher on the mpi so you just use a large washer and it fits perfect.

MY cento had this setup for a while (check out my blog and gallery) but updated to mpi because its better for turbo setup

 

[fingers99]

If it's just a fresher engine you want (or something a little faster, more driveable) then a Punto 60 engine is probably the way to go: very easy swap. Otherwise, SPI head, MPI block and bottom end, skim, re-shim, cut in the valves, etc. while you're at it. Plenty of P75 (early MPI) engines have been fitted, too.

As intimated, there's not really any point in going MPI on the 1108 unless you're turboing it or building a screaming 1108 (expensive) in which case you could even convert the SPI manifold to MPI by welding a set of injector stubs on the inlet mani and run an aftermarket ECU.