Originally Posted by h196jne

The conversion from xr2i - RS Turbo is quite straight forward, the engine from the escort rs turbo is no good as you need the crank postion sensor and the management is totally different to the efi unit.

Easy option is search ebay for:

OFAB Mangement: ECU, Wiring loom, blue injectors, and edis module.

Then source a N/A 1.8 zetec bottom end from an escort/mondeo:

if you bolt a FRST/XR2i head onto a standard 1.8 Zetec bottom end you wil have a 8.5:1 compresion ratio ( just a tad higer than std ). The pistons are good for 18psi unskimmed or 14psi if they are skimmed.

Then fit a T3 turbo from a cosworth or escort turbo.

Just an option if you find it hard to source parts over there.