I was thinking of adding a turbo from a vauxhall corsa (2000) to an 1985 Nissan cherry.
It was originally 60bhp but me thinks is left 50 horse's in the stable.
Any advice greatly appreciated
You will need understand that you can't just add a turbo to a NA engine and all will be well.
I have posted the link that will give you some insight as to what is needed to help give you a better understanding as to what needs doing to prevent it going bang .
Things to look out for when adding a turbocharger to a non turbo car, some basic pointers. How to turbo a car, can you put or add turbos to any car and guide to how to install or add a turbocharger on a non turbo.
I admire your ambition and enthusiasm and wish you well, please keep us updated with your project and plans as they develop and feel free to run things by our community for suggestions and tips.