well i turbod my 1.4 befor i put a zvh in and did nothing to the engine at all just bolted the erst turbo on run oil feed from oil pressure swich welded return in sump conected all up and ran 7 psi boose with blue frst injectors and more fuel pressure with an fse valve befor i took it out i ran 15 psi and full fuel pressure to try and kill it for 500 miles and diddent die when i striped it there was no dammage to pistons at all and still ran sweet aswell befor i took it out i would say you mite need bigger injectors aswell as an fse valve but i would only run 7 psi max if you want it to last on standard compression.