Topic: Cb550 Turbo Information.

[Lostboy Steve]

I did a bit of searching and I cant find what I'm looking for. For my newest project, I have decided to build up a turbo 550. This wont be my first DIY turbo setup, but it is a first utilizing a carburettor. I'm going to use a small turbo. I havent decided exactly which one. I might use a GT12, or the growingly popular, RHB31. I need an idea of what size carb would be best for a pull through setup. I'm thinking about using a 40mm Harley unit. The accelerator pump and CV design look promising. I know jetting will be trial and error, but as I want to start collecting parts I need to know what I'm looking for.

[TurboD]

I would try to pick a turbo with a exhaust trim around the .2 range, .25 max to have a decent spooling setup. I think a 40mm carb might be on the big side, I'd guess something around 34mm for a 550.

[Lostboy Steve]

Thank you sir. Exactly what I was looking for.