HKS GTSS v GTRS

[jezzrrr]

Anyone had any experince with these turbos and able to say how much laggier the RS's are compared to the SS's ?

[Nismo32]

It is a fair bit. The SS isnt rated at more than 280HP i think and the RS is at 400HP. I have seen a few SS's and they are quite small from memory. The RS is definatly the go.

Cheers

[meshmesh]

Anyone had any experince with these turbos and able to say how much laggier the RS's are compared to the SS's ?

Oz GTR97V has a thread, but still waiting for dyno results

http://www.skylinesaustralia.com/forums/sh...ead.php?t=28909

[Merli]

I'll have my GT-SS turbos on the car within the month, so stay tuned...

I'll hit OZ up for a dual dyno session and we'll print out a dyno sheet with dyno curves of both cars superimposed on each other so you can see the difference.

That said, they're completely different turbos.

GT-SS are small. Smaller than 2530s and rated at 280ps each. I'm hoping for 300kw @ all four from them.

GT-RS are huge. Bigger than 2540s and rated at 400ps each.

That's a 240hp difference in turbos. BIG DIFFERENCE.

I opted for maximal response for street and track use, so I went for the fastest spooling turbos I could find... Hopefully I'll be happy with them.

[jezzrrr]

I'll have my GT-SS turbos on the car within the month, so stay tuned...  

I'll hit OZ up for a dual dyno session and we'll print out a dyno sheet with dyno curves of both cars superimposed on each other so you can see the difference.

That said, they're completely different turbos.

GT-SS are small. Smaller than 2530s and rated at 280ps each. I'm hoping for 300kw @ all four from them.

GT-RS are huge. Bigger than 2540s and rated at 400ps each.

That's a 240hp difference in turbos. BIG DIFFERENCE.

I opted for maximal response for street and track use, so I went for the fastest spooling turbos I could find... Hopefully I'll be happy with them.

Thats my rational too will be interested to see your ressults, have you heard anything about these new trust T517Z'z, they look aweswome ! Gt SS response with 2540 power ?

[Merli]

ph1 on these forums has T517z with 8cm2 exhaust housings on his R33 GTR...

He made 347kw @ all four if I remember correctly, and when he took me for a drive, it didn't feel overly laggy (which I would have expected compared to ball bearing HKS range), but ask him for his personal experience and what rpm they make 1 bar at...

As mentioned in other threads, my build has been postponed, pending the arrival of forged internals, so it will be another month until I can give you any results of my GT-SS turbos

[mxfly]

GT-RS are not huge and are certainly not bigger than 2540's. GT-RS runs exactly the same turbine (or compressor, I cant remember) as a 2540, but is more responsive. I've been in an S14a with a GT-RS and my God does it spool up much quicker than a T28. And no other mods were put in except for the turbo.

[DoughBoy]

Hey looking at it on paper, if you put 2 x GT-RS on an RB26 it's meant to have the same output as a T51R KAI? Does that mean the Kai is as "responsive" as a GT-RS setup, or that the GT-RS has as much lag as a big single?

[gtr13]

turbine is the same the compressor is slightly smaller on the RS compared to the 2540

[r32-25t]

i have a set of gtrs for my r32

but i have yet to put them on as i have other projects in the way

[Whoneedstherapy]

doughboy: i'm pretty sure in kit for for an RB26 they rate them at around 700ps, similar to the 2540 & the trust T618Z

[Merli]

Hey looking at it on paper, if you put 2 x GT-RS on an RB26 it's meant to have the same output as a T51R KAI? Does that mean the Kai is as "responsive" as a GT-RS setup, or that the GT-RS has as much lag as a big single?

If anything, I would have thought the GT-RS would have MORE lag than a big single?

[Whoneedstherapy]

If anything, I would have thought the GT-RS would have MORE lag than a big single?

i guess it would depend on the big single merli

IE apexi AX82 big single - more lag

HKS T51 R SPL - less lag

[jtir]

GT-RS are not huge and are certainly not bigger than 2540's. GT-RS runs exactly the same turbine (or compressor, I cant remember) as a 2540, but is more responsive. I've been in an S14a with a GT-RS and my God does it spool up much quicker than a T28. And no other mods were put in except for the turbo.

Actually, I would think the standard S15 T28 spools and makes full boost quicker than the GT-RS.

[mxfly]

Johnny,

I'm talking about a T28 non BB off an S14a, not the S15BB turbos. I've been in a few S14's and they spool a lot later than the BB turbos.

But you're right about T28BB spooling a little quicker than an RS.

[ed]

GTSS vs GTRS, I think it would be more of what are you chasing?

and will it be on the standard displacement 2.6L?

I reckon merli is on the right track with the 2.6L + GTSS combo, matched with some cams, lightweight flywheel, should be responsive as and be fun to drive on the circuit and street.

IMO the GTRS is more suited to a 2.7+ litre combo.

But if you're after big HP then go big single?

[judd]

MODEL Wastegate (Sold separately :*Excluding some items) Horse power*per turbine (PS) Compressor Wheel Compressor Housing Turbine Wheel Exhaust Housing

Trim In Dia. Outer Dia. In Dia. Out Dia. A/R Trim Outer Dia. Out Dia. In Flange Out Flange A/R

(mm) (mm) (mm) (mm) (mm) (mm)

GT-SS Actuator *1 280 60 46.6 60.1 *2 *2 0.6 76 53.8 47 GT25 S/V GT25 0.64

GT2540 Actuator 350 46 51.7 76.2 ¢60 ¢50 0.6 76 53.8 47 T3 S/V Only for Skylines 0.64

GT2540R Actuator 360 46 51.7 76.2 ¢70 ¢50 0.5 76 53.8 47 GT25 S/V GT25 0.64

Actuator 370 0.86

GT-RS Actuator *1 400 52 51.2 71.1 ¢60 ¢50 0.6 76 53.8 47 GT25 S/V GT25 0.64

[judd]

GT-RS are not huge and are certainly not bigger than 2540's. GT-RS runs exactly the same turbine (or compressor, I cant remember) as a 2540, but is more responsive. I've been in an S14a with a GT-RS and my God does it spool up much quicker than a T28. And no other mods were put in except for the turbo.

The GT-RS are definnaly bigger than the 2540s, they run the larger GT2835 Compressor wheel (52 trim) compared to the GT2540 (46 trim) but both have the same exhaust size & housings.

GT-RS has 400PS output whereas the GT2540 has 350PS

[Sydneykid]

Hi guys, I posted this a while ago, but for those that haven't read it....

Here is the data on the HKS turbos

.....................Compressor......................Turbine

....................Trim...Inducer....Exducer...Exducer...Inducer....Trim

GT2530..........63____1.860____2.344___1.883____2.098____76

GTRS.............52____1.997____2.773___1.833____2.098____76

GT2835..........52____1.997____2.773___2.020____2.204____84

GT2540..........46____2.016____2.972___1.833____2.098____76

As you can see the GTRS is merely a 2835 compressor (and cover) with a 2530/40 turbine (and cover).

Hope that helps

[Elithrar]

Would a custom manifold be required to mount a GTSS on a RB20DET?