Quote:
Originally Posted by redline racer510
anyone know a good turbo that fits the stock rb25det manifold that is good for 350-400. i did some research and found that hks has an upgrade but is pretty much maxed out at 350whp. i found some dude that put a gt3076r .63 A/R turbo but he said he needed to grind down part of the manifold and use a spacer to fit. thats all i got so far and thinking about doing either one of these because i heard they have excellent spool characteristics*. anyone that has experience in this field please post any suggestions.
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HKS turbo's are underrated boost/HP wise. I ran a HKS GT2530 on my RB25 at 11 pounds of boost and it was hitting 300whp. They have been rated in the 360 range at 1.18 bar on independent dyno runs in Japan. Though if you got a GT2535 or 2540 you would pretty much hit your mark easily with at least 550 injectors and a Z32 maf with either some kind of tune/standalone or PowerFC.
If you went with a aftermarket manifold you could toss on a lot of different Turbos. I had a friend that put a T66 on his RB25 hahahhahha and did 390whp at 11lbs. Mind you it did not spool till close to 3-4k. The HKS GT series for the RB spools like lightening its pretty damp dope. Though they are not inexpensive Turbo's. A Garrett that was equal in size would work quite well too.
Though the backside would not be RB specific, as RB25DET turbo backsides flange wise are unique aka Nissan designed. You would then have to get a who different elbow to bolt up to your downpipe if you strayed off the RB specific turbo setup.