[wheelhop]

Pretty sure Rau is sponsored by BW, so he likely doesnt pay for shit as far as turbos go.

Buy is the wrong word. I should have said that apparently Brent Rau sees eye to eye with BEP on turbos. Kiggly runs a BEP Borg-Warner turbo as well.

If I'm willing to accept the lag of a ball bearing gt35r hotside with a compressor capable of pushing a 2700lb car to 154mph, i'd get the larger .70a/r bep turbine housing with the hx40. In the mean time the smaller housing gives me spool about 500rpms faster than that gt35r variant in an single scroll housing and has done over 650whp:



It spools faster than the gt35r since as you can see, the power band looks pretty much the same as the comparison turbo from which directly swapped on the dyno. That comparison turbo was the gt3076r. And that was all he could get out of the gt30r. How much more could the hx40 do with one of the larger turbine housing options.

Now I agree that trap speed is a better indicator of hp, when you know the race weight. . . Are you looking to compare the garrett or other similar flowing turbine counterpart to the hx35/40? Since these ARE real turbochargers . There are similarly flowing turbos between brands but drastically different spool speeds. Airflow is airflow. Efficiency is efficiency.