Vargas Turbo Tech (VTT)
Stage 1 upgrade
Manufacturers Description:
WHP Level supported (with proper fuel, upgrades, and tuning) Stock - 425WHP
Our NEW N55 Stage 1 upgrade consists of a brand new N55 turbo, custom cast and manufactured for VTT, this is coupled with a VTT custom reverse billet compressor wheel and brand new stock turbine. Stage 1 upgrade uses the stock plastic DV, but with the option to include a custom VTT / Forge DV system, or a GFB DV+ system to replace the stock plastic DV parts which are prone to cracking, and leaking. This upgrade will support 40-75 WHP over a stock turbo with stock spool and plenty of flow to redline. Turbo upgrade is a complete bolt on with no changes to water or oil lines and is undetectable by the dealership.
Stage 3 N55 "GC" DBB Cast upgrade
Manufacturers Description:
WHP Level supported (with proper fuel, upgrades, and tuning) Stock - 600WHP
Our N55 "GC" upgrade consists of 100% new castings for the entire unit. The turbine housing and manifold have been cast in two pieces with all the factory flow restrictions removed. This allows our uprgaded to support a whopping 600WHP. The highest for any drop in N55 upgrade. A GENUINE GTX3670R Garret Dual Ball bearing center section is used, coupled with VTT custom reverse wheels. The compressor is a full billet 11 blade GTX wheel, and the turbine is a Garrett style 10 blade design, these are the same turbine wheels you would find in the Garrett GT line up but made in reverse rotation. DBB stage 2 upgrade also has the option to include a GFB DV+ system to replace the stock plastic DV parts which are prone to cracking and leaking +$245 from the drop-down. This upgrade will support Stock levels-600WHP with quick spool and plenty of flow to redline. Turbo upgrade includes everything needed to install turbocharger including all water, and oil lines, and o-rings.
VTT N55 "GC" Units have no core charge
Source:
http://performance.vargasturbo.com/b...ducts/bmw-n55/