which turbo for low-end?

[curbsurfer253]

i need to pick out a turbo size for an rb25det i'm building. i'm building this motor for low-end torque. My goal is something that can spool around 3500 rpm and make around 350-375 peak whp. i planned on an ihi rx-6 but my budget might restrict me from that. what size hks turbo would be good for my goals. the motor is going in a zenki 240.

[BlockHead]

Why dont you stick with a garrett turbo from someone like Precision. As long as its a T3 or a T3/T4 it will bolt right up. Why do you only want to make 350-375 but mad torque? Cuz you can make good power down low and have it hold all the way up.

[Project240]

HKS turbos aren't exactly cheap either...

[curbsurfer253]

which hks size is best then

[Project240]

The GT series turbos are great for low-end response (since they're ball-bearing) and they produce good high-end power as well. GT2530, 2540, or even a 2835 would be great for your purposes. Although, I don't know what type of flange they use (might be a T25/28 flange), and they *are* pretty pricey.

[rbsileighty]

The GT series turbos are great for low-end response (since they're ball-bearing) and they produce good high-end power as well. GT2530, 2540, or even a 2835 would be great for your purposes. Although, I don't know what type of flange they use (might be a T25/28 flange), and they *are* pretty pricey.

As far as the ones you mentioned, I wouldn't go with anything smaller than the GT2835. If you are dead set on a HKS turbo, then go with something like a GT3037 with a ~.63 A/R turbine. There was a guy pushing that kind of power with that setup with the same spool you are speaking of on the Skylines Downunder forum "Steve," but he switched out to a ~.83 turbine and says he will never go back.

[curbsurfer253]

what greddy sizes are good. i'm not the bright when it comes to turbos and the rb25 clip i just bought has no turbo on it. Don't small exhaust housing on turbos give good low end? how much boost can these hks and greddy turbos handle?

[Ineed2speed]

Will these turbos do around 400-450rwhp at about 18psi? I'm also interested in low end turbos for rb25dets. I want to know what kind of setup will produce 450rwhp real fast, before 4500rpms. Let's get some more input guys!

[BlockHead]

Greddy turbos are out of the question unless you are planning on getting a new manifold.

[Project240]

Overall, I would suggest a good Garrett T3/T4 hybrid as well. There's a MILLION to choose from in pretty much any combination A/R ratio you could dream of, brand new or used, on Ebay or elsewhere. You won't need a new manifold like you will with a Trust turbo, and you won't break the bank like you will with an HKS kit.