trying to decide on turbo sizing for twins.

[monster50iii]

Well Im getting twins: 62/?? Over an s475. I cant decide on the 68 or 71 turbine wheel.. I was told the 71 will help spool the primary a bit quicker but Im afraid Ill lose alot of spool. My truck has a 66 on it from ed and here in mn with the cold its prettty dirty, and tuning doesnt seem to help. I want/need more cruising boost, and yet I want to get the most out of my setup. Any info would be greatly appreciated!

 

[Lostnwalmart]

Are you even conserned about the s400 turbine or either turbo's turbine housings?

 

[Ghostman]

Go with the 68 turbine wheel on the secondary with 14cm housing. I would say primary turbine housing size and wheel will determine its spool characteristics more than secondary.