I thought a few of you guys might be interested in some of the latest on the BorgWarner EFR turbochargers, especially the viability of the internal waste-gate turbine housings. The 7670 and 8374 are pretty well suited for most 2 rotor applications. The 7670 is particularly nice for a sub 400rwhp car looking for ultra fast response, and the 8374 for the 500~ish rwhp cars. Anyhow here is part 1 of the 7 EFR turbo systems we are building( some we are also tuning in house too).
http://blog.turbosource.com/2013/11/...rotary-engine/