I have what I think is a stock Audi 1.8 litre turbo. Does anyone know what are the stock compressor and turbine housings and what would be most suitable for a stroked and bored 8v engine yielding 1.5 litre?

Most suitable would be same size as this 1.5 litre 4 cylinder turbo.

https://en.wikipedia.org/wiki/BMW_M12

https://www.racecarsdirect.com/Advert/Details/98874/1986-bmw-formula-1-turbo-engine-nos

🙂

Think you may need to ask a specialist like TurboDynamics. The 1.8T has more valves so better flow and will likely need a different compressor map to be smoothly driveable on road.

 

 

 

Thanks for all of that. I will get in contact with them.