Right converting my cinq from spi to mpi just trial run before freshly rebulit engine goes in and i have all the bits required but my question is where the fuel hoses connect to the pressure regulator which one is the supply and return pipe, i have a good idea but just need to double check. The fuel rail/manifold assembly is off a punto 75 if that helps.

If you refer to your original throttle body there are arrows on the top showing which pipe is in and therefore out.

Cheers

SPD

I thought a 75 inlet manifold doesn't fit a stock SPI head as the stud pattern is different

Must change head ,pump ,preferably ecu,for what its worth the punto 60 ecu will run SPI or MPI with only one wire modification the punto 75 ecu will only run MPI.

Cheers guy's. Forgot abotu the head :bang: Is it really worth converting spi to mpi on a cinq or am i just really waisting my time on this one, thinking ive come up with another bright idea that isnt so bright

MPI was done for emissions not power.

Cheers

SPD

ahhh ok. So by converting to mpi i wouldnt be gaining anything really over the spi set up.

lee89 said:

ahhh ok. So by converting to mpi i wouldnt be gaining anything really over the spi set up.

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Oh you'd gain something alright!

A whole heap of hassle.

Cheers

SPD

and 3 more injectors

Right my thoughts are staying spi for now. If there are little/no gains then its not worth the hastle is it really, Thanks guy's for the advise.

If you want to do something, then make sure the car is fully serviced with the correct grade oil.

A good old fashioned decoke with a bit of a tweek would further help.

Cheers

SPD

allanhelen said:

I thought a 75 inlet manifold doesn't fit a stock SPI head as the stud pattern is different

Click to expand...

and isnt there a little bit removed from top of inlet ports for injectors to fire in to the port and not the head?

THE conversion isnt worth doing on an 1108cc 54bhp as no gains. you can fit the punto 75 CAM for a bit more pwr .Or fit the punto 60 1242 60bhp useing all of the cinqs ancilleries inc the ecu, but better to use the punto 60.However once you have a 1242 in the only way to get the punto 75 (75bhp)preformance is to convert to mpi,not sure about the emissions comment ime sure it helps but the 15bhp increase cannot just be atributed to the cam and ecu.IF i am wrong please let me know i can stop my conversion then. lol. By the way i have a 1242 SPI. complete engine only 6months after rebuild including 866 punto cam for sale. (still in car) i am building NEW unit.

The Punto 75 1242 does get some of its extra power from the inlet, but the head layout also contributes.

The MPi 1108 has the same specific output as the SPi 1108, so in this application it was for emmissions.

Cheers

SPD

rallycinq said:

The Punto 75 1242 does get some of its extra power from the inlet, but the head layout also contributes.

Click to expand...

indeed, as does the exhaust manifold.

if you want mpi, stick in a 1.1 mpi
if you want more donkeys, stick in bigger engine ie punto 75 with mpi
hardest thing i found putting in the 75 lump was massacring the wiring to meet up with cinq multi pin socket and what wires did what.
not only that but its 75ish horsepower there with the exhaust manifold.
job done:slayer:

Cheers for th input guys, think ill start building up the bits i have for the ultimate 1242 well in my opinion anyway and go from there. Cheers peeps

mpi would need the 75 ecu or aftermarket. It might run if you just connected the spi wire to all 4 injectors but i doubt it would ever pass emissions.

mpi is pointless unless you are running highly tuned engine that needs better control over fuel supply

IF you plug a punto 60 ecu into a cinq loom it will run SPI, add an ignition feed to pin 26 (orange/black wire) in cinq plug it will run MPI. the pinouts for the three ECUs in question are identical. However the punto 75 ecu does not use pin 26 so the wire in the cinq plug dedicated to this pin must be cut from the plug and an ignition feed connected to the wire end (not plug end) this will now run MPI.