hi everyone
after reading some info i had an idea for making a turbo engine but need your opinions about it . is it possible ? if so it would be my next project .

- regata ( strada ) 85S 1.5 l engine block and head
- uno 1.3 turbo pistons to lower the comp. ratio
- uno 1.3 turbo camshaft
- uno intake and exhaust manifolds
- t25 turbo with custom flange
- bigger injectors and matching fuel pump and fuel rail
- uno turbo ecu with wiring loom

i'm choosing the regata engine coz i knew it has forged con rods and can handle boost specially if i put the uno turbo pistons ( same bore as the regata 86.4mm ) so is it possible ? and how much boost can it take ?

dr_joe said:

hi everyone
after reading some info i had an idea for making a turbo engine but need your opinions about it . is it possible ? if so it would be my next project .

- regata ( strada ) 85S 1.5 l engine block and head
- uno 1.3 turbo pistons to lower the comp. ratio
- uno 1.3 turbo camshaft
- uno intake and exhaust manifolds
- t25 turbo with custom flange
- bigger injectors and matching fuel pump and fuel rail
- uno turbo ecu with wiring loom

i'm choosing the regata engine coz i knew it has forged con rods and can handle boost specially if i put the uno turbo pistons ( same bore as the regata 86.4mm ) so is it possible ? and how much boost can it take ?

Click to expand...

Careful! Mk1 Uno Turbo pistons are not 86.4mm - they are 80.5 mm. The 1301cc turbo engine does NOT have the same bore/stroke as the 1301cc non-turbo engine... Maybe you are thinking of the Mk2 Turbo (1.4)?

Cheers,
-Alex

Not possible. Uno turbo pistons are 80.5mm like Alex said. Mk2 turbo pistons are also 80.5mm.

1.3T cam is not a good choice, 1.5 is better. Rods are not important, cast will be adiquate

Bigger injectors may not work with the Uno turbo ecu.

well it's mentioned everywhere even in hayens manual that the uno turbo 1.3 is 86.4*55.5 ( 55.4 for the 1299 version ) and you're right 80.5 for the 1.4 but i was thinking of the 1.3 t engine , about the con rods it has to be good to handle the boost and the regata rods are forged steel .
why the ecu can't handle bigger injectors ? is it impedence issues ? if so maybe i can use resistor box or choose ones with the proper impedence ?

dr_joe said:

well it's mentioned everywhere even in hayens manual that the uno turbo 1.3 is 86.4*55.5 ( 55.4 for the 1299 version ) and you're right 80.5 for the 1.4 but i was thinking of the 1.3 t engine , about the con rods it has to be good to handle the boost and the regata rods are forged steel .
why the ecu can't handle bigger injectors ? is it impedence issues ? if so maybe i can use resistor box or choose ones with the proper impedence ?

Click to expand...

Mk1 Uno Turbo is still 80.5mm, even in Haynes if you look in the right places (the Supplement).

You can connect 'bigger' injectors (injectors with a higher flow rate) but it won't idle properly because the ECU has no way of knowing that extra fuel is being injected...

What I suggest you do is, make up a 'decompression shim' (like a head gasket, but made out of aluminium maybe 3mm thick), and then bolt the turbocharger etc. straight on to your Regata 85S engine (the 1498cc). Don't bother with mixing cranks, rods, and pistons...

Then set it up with a standard ECU, higher-flow injectors (green-coloured Bosch injectors spring to mind), and then fit an interceptor/adjuster that goes in line with the airflow meter and 'adjusts' its output, so that the ECU believes the engine is taking in less, or more, air. This allows you to adjust the mixture at many different points in the speed/load range.

The 1498cc will have a bit more torque than the 1301cc, so should make for a gutsy unit.

-Alex

dr_joe said:

well it's mentioned everywhere even in hayens manual that the uno turbo 1.3 is 86.4*55.5 ( 55.4 for the 1299 version ) and you're right 80.5 for the 1.4 but i was thinking of the 1.3 t engine , about the con rods it has to be good to handle the boost and the regata rods are forged steel .
why the ecu can't handle bigger injectors ? is it impedence issues ? if so maybe i can use resistor box or choose ones with the proper impedence ?

Click to expand...

They are wrong. Uno turbo has 80.5mm bore

1.4T rods are cast
1.3T rods a forged
1.5 rods are forged.

Ive never seen a broken one, not even at 300HP. Any of these rods will be adiquate. The pistons will break long before the rods do.

The ecu will operate larger injectors just fine, but it cant tune itself

Hmm I am thinking.
I have build a 1.5 Uno Turbo too and took the 1.5 MPI engine of the Uno. But this engine is also used in the Fiat X1/9. You only have to do some minor changes and you are ready to go!