What KTS makes
KTS part numbers carry an MFS prefix. Its range covers many blade layouts, from split-blade designs such as 6+6 to full-blade designs such as 11+0, in forward or reverse rotation, with a threaded bore or boreless, and with options such as tapered tips, cutback and flank or point milling. KTS says it machines its wheels on high-speed 5-axis computer numerical control (CNC) machines and has used two-plane balancing since 2014.
Billet compressor wheels in a turbocharged build
A billet compressor wheel is machined from a solid aluminium blank instead of being cast. Garrett, the turbo maker, reports no noticeable performance gain when it tested a machined wheel against a cast wheel of the same design. Garrett says wheel diameter and blade shape are what decide performance, and that a machined wheel's advantage is strength and fatigue life where the turbo is constantly cycled between high and low load, as in a city bus. So any performance difference between a KTS billet wheel and the cast wheel it replaces comes from its design, and from how well it is matched to the rest of the turbo.
GP Turbos' hybrid turbos have been built with billet compressor wheels, and GP Turbos has also sold billet wheels as parts in their own right. This page describes KTS's own range; it does not say which maker's wheels any GP Turbos turbo uses. If you are weighing up billet compressor wheels for a turbo, or your current turbo needs a rebuild first, get in touch.