if you wanted 380/400 odd BHP what turbo would you buy?
the aim of the game is a nice responsive turbo with a broad power curve so it gives nice driveability. over 400hp seems to be where problems start, so staying under this should yield reliability (he hopes!!).
id like to stay internally waste gated and low/bottom mounted, the fabrication side of things is not really an issue.
ive been thinking of the EFR 6758 with the .64 T25 fitment single scroll rear housing. This should bolt upto an off the shelf s14 manifold which should make my life easier as I would just have to fab up a down pipe and inlet etc..
. but I see they also do a .80 T4 twin scroll, i assume this would give it more grunt 'up top' but am unsure what would be happening lower down the RPM scale. the internet seems to be awash with build threads of people fitting these but then never commenting on how they perform.
I also see talk that the larger EFR 7163 (which has the T4 .80 twin scroll rear housing) spools the same if not quicker as the 6758 but does not 'top out'. this is obviously a larger turbo and exceeds my power goal.
or i could get a GTX2867 but these are well over a grand and ive had crappy garrett bearing cages fail on me in the past. A2871r just seems like a dinosaur these days as do the TD04, TD05 etc..
ive got rb25 gearbox/forged engine /720's etc.. so am 'good to go' in that respect.
where would you put your money and why?