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

    • The German place in Cabramatta was rock solid, fresh pretzel cooked to order back then. Then it went all quiet, after all the poker machines were removed, then I believe it closed for good. I did drive past the other week and noticed outdoor lighting a big screen, but no idea what is there now.  
    • Yeah I suspect even if you hold airmass per cycle/cylinder constant if you get too far away from stock you're still going to have problems running the factory tune within the bounds of the factory load scale. Cams, different displacement/rod ratio, etc. I'm just lucky that the GTIII-SS with wastegate boost + CA compliance cats is pretty much equivalent to stock turbos. When I have actual space I can finally get it tuned and modify the fuel system for flex fuel to 100% handle any detonation concerns when cranking the boost to whatever those dinky turbos can put out.
    • I would say no, why, because my daughter, who also lives in Goulburn, hasn't recommended us going there Pity, as we miss all the German joints around in Sydney, actually, the restaurants are the only thing I really miss about Sydney, and a special mention to Ishibanboshi at Bondi Junction, their Kara-age Don is heart cloggingly deliciousness (always added a special boiled egg...or 2) 😋 
    • Does that German restaurant still exist in the old place out the NW end of Goulburn? When I say "out the NW end of"...I am really being vague. It was 1997 when I was last there, and the only point of reference I can recall is that it was on the opposite side of the main drag from the big merino. And when I say "opposite side of the main drag", I don't mean "on the main drag". It was either a couple of streets back from there, or might have even been out in the sticks a bit further. Was an old farm building or mill or somesuch. And when I say "the big merino" I might actually be thinking of a completely different part of town, because I just looked on maps and the big bugger is not where I remembered him to be! The food was good, consisting largely of various German mystery-meat sausage/loaf things and kartofflen.
    • So while the second sentence is completely correct and the whole point of the conversation, the first sentence bears consideration. If this bloke is just hoping to throw big turbos on and drive it around, because there are no helpful facilities at all in his tropical paradise** then he likely has zero chance of even knowing what the TP is on the last column in the stock maps, let alone know whether the ECU is operating anywhere near it or past it. So the point is very very moot. And, per what I said before, at stock boost on those turbos, you may well be off the end of the map. **I'm just back from Vanuatu, so I know exactly what small Pacific nations can be like wrt paradise without requisite facilities. But it's not even that simple. I put a high flow on my car and had to drive it around without a proper tune because of the lack of opportunity*** to put the bigger AFM and injectors into it to allow it to be tuned. I had to turn the boost down to less than I had before, and back off the boost controller's ramp, because it was exploring parts of the map that it didn't drive in before, and really couldn't access for tuning on the dyno either, and so was pinging. It was still well within the last column, because when I first**** set up the Nistune on the Neo I rescaled all axes of the maps to give some more space to explore. ***Family dyno was broken ****This was 13 years ago, and the TIM thing wasn't a thing then and so TP would definitely grow when pushing past the stock tune's limits.
×
×
  • Create New...