Jump to content
SAU Community

Recommended Posts

Since toying with the idea of putting a supercharger on the RB20 went down in flames (Read: Cost) I'm currently looking into turbo upgrades, and I was recently talking to Tom from www.bd4s.com.au.

I was enquiring as to the price of their HKS GT2530KAI units. He wrote me back telling me that the HKS GT-RS is a better turbo. He claims that it will spool faster than the 2530 and also make more power through the range.

I looked at the HKSUsa website and it appears that the GT-RS and the 2530 both have the same exhaust housing and wheel specs, but the GT-RS has a larger compressor side, does this mean, as Tom is saying, it will spool faster and make more power through the range than the 2530?

Another thing I am concerned over is the fact that HKSUsa only list the GT-RS as being supplied with a T25 flange, I was under the impression that for a unit to be bolt-on for the RB engines, it required a T3 flange?

Any insight would be greatly appreciated, as well as any experienced people have had with either of these units, especially on the RB20.

Cheers,

Ben.

Link to comment
https://www.sau.com.au/forums/topic/126524-hks-turbo-comparison/
Share on other sites

The 2530KAI is little modified from the previous 2530, other than a ported shroud comp housing. Specs of the rotating assembly is unchanged. Response ability should be unchanged. Normally the porting is done to control/reduce surge.

The GT-RS has an upsized comp impeller 71mm vs 60mm for the 2530KAI. This will directly affect (reduce) its ability to respond quickly, but increase its power potential compared to the KAI.

Hope this helps.

cheers

Dale

Search HKS Japan , click first site and look at the menue on the LHS of page . Click on Turbo , GT-RS and scroll down through the S13 (SR20 version) , R34 GTR version to RB20/25 version . Even shows bling pic of port shrouded comp cover .

Enjoy .

Edited by discopotato03
The 2530KAI is little modified from the previous 2530, other than a ported shroud comp housing. Specs of the rotating assembly is unchanged. Response ability should be unchanged. Normally the porting is done to control/reduce surge.

The GT-RS has an upsized comp impeller 71mm vs 60mm for the 2530KAI. This will directly affect (reduce) its ability to respond quickly, but increase its power potential compared to the KAI.

Hope this helps.

cheers

Dale

So it is in fact true that the 2530KAI will spool faster than the GT-RS, but it's due to less rotating mass, if I understand what you're saying correctly?

Sounds like for both purposes (Price and response) the 2530KAI is deffinately my best choice.

Infomation has helped alot, thanks all :D

Ben.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Welcome Thomas! Sounds like you've made some progress. Are you able to drive it and enjoy it a bit now ? 
    • HUMVEE are fine in big open areas, but they are problematic on the street and tight areas As for reliability, some of the  US Army guys I have chatted with have said that when they were working they were fine, but, the do spend alot of time in workshops for multiple reasons, admittedly, they did get a hard time by the boys and girls who drove them I would definitely put them in the "buyer beware" category  They do look tough as nails though 
    • Just don't use ChatGPT or any other artificial stupidity for the equivalent of googling. Their demonstrated inability to discriminate reality from hallucination should be enough to make them totally untrusted. LLMs don't know anything and cannot think to even the smallest extent. They are just predictors of the next word, and that should never be confused with capability.
    • I think, given the usage model described in the OP, I'd never ever experience the wonders of the 400kW upgrade. What I really need is boost from 2000rpm and probably no more than 260-270rwkW. But I suspect that the highflow is not actually the turbo for that purpose, so I may in fact need to get a G25 or 30 or something right sized and very spooly. We shall see after it is tuned. I've had to back the boost and boost ramp off to stop the thing from pinging since the highflow went on, so I've been almost living the NA life for 9 months now! Injectors are recently in hand. AFM is in hand. Dyno is fixed. Just need to clear a queue of f**king Supras out of the way (and probably fit my new gearbox). So....some time this year? Lol.
    • For what I gather is a Sunday/summer car....braided is fine. You're not going to be left without a vehicle and you have plenty of time for inspection/maintenance. Oof. I wouldn't use them that way. They can probably handle the temperature** but the internal corrugations means that their flow characteristics are a bit shit. Lots of extra friction and pressure loss. Makes them flow like the next pipe size down. ** They are stainless, and the stainless can usually be at least something like 304L, which is pretty good at higher temperatures (unlike 316L, which I would use for a wrt/corrosive environment, but not a particularly hot environment). But the welding needs to be top notch. And even then, because you usually need at least one cone-seat end on them (because you can twist the hose and do up both ends at the same time unless one of them is a union) they can be prone to coming loose with heat cycles.
×
×
  • Create New...