HKS GT-RS turbo on RB25DET?

[4DOOR]

Hey guys. I am currently looking at upgrading my turbo to a HKS GT-RS or GT2530 KAI and I would like some advice on the upgrade. I own a manual R33 Skyline sedan and basically I am after an internal gated turbo as I want the car to be perfectly streetable and insurable but I want it to be fast at the same time. Other things I will upgrade with the turbo are AFM, ECU (Power FC), clutch, injectors, fuel pump etc. The car already has a cat-back exhaust and HKS FMIC so hopefully I don't need to replace those things. I would like to know which turbo would best be suited to my application and the advantages and disadvantages of each. Any other information is greatly appreciated and please forgive my ignorance on this subject :confused:

[paulr33]

should be plently of info in the rb25 dyno upgrade thread, should be stickied at the top or in the forced induction reference thread. change the stock dump as it will be a restriction. the gt-rs will flow more and should get you near 260/270rwkw based on some of the graphs from the rb25 dyno upgrade thread. the 2530 kai havent seen any graphs or runs from anyone running these yet, probably silighty more than 2530 but less than 2535 at a guess?

check out the rb25 dyno upgrade thread. the mods youve listed should do you fine. maybe consider a set of cams, should do wonders when you have a bigger a/r turbo

[SAMFISHER]

Check the HKS website for details

HKS achieved 290kw and 465Nm at the engine with GT-RS on a RB25 stagea

,268kw and 450Nm with GT2530-KAI in the same set up.

Both made peak power at about 6500 rpm and peak torque at 5000 rpm.

As the GT-RS kit only costs two or three hundred dollars more, this may be the best way too go.

More power with a slight loss of response but will save you from wondering "what if?" which could happen if you went with the smaller turbo.

[Cazisk]

ive got the gt-rs installed atm but is waiting for ecu and tune in about a weeks time so i cant tell u how it is yet, will post here once its done tho.

[Beer Baron]

HKS GT-RS is a great turbo for a standard (engine) RB25. it will be awesome fun.

[netrati]

HKS GT-RS is a great turbo for a standard (engine) RB25. it will be awesome fun.

I have the GT-RS turbo on my sr20det and I get excelllent spool. Should be even better with 500cc more displacement.

[Dee 33]

One of the most common turbo upgrades for RB25's.

Sometimes I wonder if I should have gotten one instead of my 460hp unit which it probably a little laggier.

[cordiapower]

is it better to get it from nengun or greenline and which has faster delivery?

do u need to change dump pipe with the kit?

[netrati]

I don't think you need to change the dump pipe. The kit should have everything, that's why they call it a kit.

http://www.hks-power.co.jp/products/turbo/.../ac_rb2025.html

[paulr33]

you dont need to change the dump pipe, but if you have the stock dump pipe you should certainly change to a 3" split one at the very least