R34 Gt-t Turbo Upgrade

[R34_Wong]

Hi everyone,

So Christmas has come, and I'm planning on getting a treat for my little beast. I've been reading through the forums and trying to assess what would be a better option for me, but I wanted to get an opinion from the masses as to what would be 'best' for me.

I'm chasing low-mid end power with this, but don't want to regret getting something that doesn't pull as hard.

So, my question is, if faced with a turbo upgrade which you were hoping to get excellent response from with some extra punch, which of the two would YOU get?

Please don't recommend others as I'm pretty settled in getting either one of these.

Thanks once again guys and gals of SAU.

[limpus]

HKS GT-SS would be alittle small for a rb25 neo and run out of puff too soon...GT-RS would be my pick...have a look at the results section for estimates of max power and the kind of power delivery to expect...

[wolverine]

out of the two the GT-RS is the one that comes with a T3 flange (assuming you order the RB25 version).

problem solved.

[DRIFTER]

gtrs

[PM-R33]

The GT-SS is made for a RB26 setup, therefore different flange as wolverine has said. So out of the two obviously the GT-RS is the pick. If you wanted something smaller (similar to the GT-SS) then go a 2535 since you can get them with a T3 flange.

[limpus]

The GT-SS is made for a RB26 setup, therefore different flange as wolverine has said. So out of the two obviously the GT-RS is the pick. If you wanted something smaller (similar to the GT-SS) then go a 2535 since you can get them with a T3 flange.

The GT-SS is not similar to a 2535...the 2535 is closer to the GT-RS or 2871...and the GT-SS is closer to a 2510...which by the way can also be found in a t3 flange...but will be too small for a 25 neo...

[NYTSKY]

If i were to pick one in the GT2### family it would be the GT2835.

[PM-R33]

The GT-SS is not similar to a 2535...the 2535 is closer to the GT-RS or 2871...and the GT-SS is closer to a 2510...which by the way can also be found in a t3 flange...but will be too small for a 25 neo...

I didn't mean the GT-SS is the same as a 2535, i meant if you wanted something smaller for earlier spool (which is why im guessing he said the GT-SS), than the 2535 is probably the smallest you would want to go. A 2510 on a RB25 is just a waste of money for an upgrade, like you have said.

[discopotato03]

Out of those two the GTRS would be the better choice for any RB25DET .

The two variants in the GTSS group are truly unique , the RB26 type is discussed elswhere here or you can search for it at turbobygarrett under GT2560R and -9 .

The second type I think is intended to be a CA18 or SR20DET upgrade , cartridge wise its like a GT2530 but with a 60 rather than a 63 trim 60.1mm compressor wheel . Probably best suit a CA or SR with a std computer and better exhaust .

I don't think I heard of HKS selling the second type GTSS with a T3 flanged turbine housing , possibly it would be OK on a mild RB20 but very tame on a 2.5L 6 I'd think .

Most people agonise over GTRS or GT2835 Pro S , cheers A .

PS Don't forget the BB Hi Flow .

[bradsm87]

I know u said ur settled on the 2 turbos but I feel so stronglt that they're both shit for an rb25!

The GT-SS is SMALLER than the stock turbo so that rules that one out.

The GT-RS has an OK compressor side but the turbine side is again, too small for an RB25. They choke up on the exhaust side up high and need lots of timing pulled out which only makes temperatures even worse.

PLEASE, PLEASE consider a GT2835ProS bolt-on kit for the Neo! They have similar to the GT-RS compressor side but an exhaust side that will actually flow a bit. Much, much better turbo for an RB25.

[Piggaz]

Im gonna go with the above...

A GT SS or a GT RS as a single turbo on a RB25?

Hmm..... I'd be going bigger!!! 2835 at the minimum or a 3037!

[PM-R33]

A 2835 is a bee's dick bigger then the GT-RS, in essence the same turbo. Both use a 56 trim/71.1 compressor wheel however the 2835 is a .68 A/R where as the GT-RS is a .63 off of memory. However the 2835 kit is around $1000 more then the GT-RS kit. So it comes down to this, if you can afford the 2835 kit then go it, if you can't, go the GT-RS kit, simple as that. Both a great option on the RB25 and will not dissapoint.

Edited December 25, 2008 by PM-R33

[bradsm87]

The gt-rs has a 52 trim with a 0.6 compressor housing. The gt2835pros has a 56 trim with a 0.5 compressor housing. The gt-rs has a 53mm 76 trim .64 t28 housing with a t3 flange. This is the big restriction. The gt2835pros has a 56mm 84 trim wheel with a .68 true t3 housing. This would flow more than even a .86 t2 housing.

Anyway, it's a lot bigger than just a 'bee's dick' bigger.

[discopotato03]

Just rehashing an old one while searching .

The GTRS's turbine is actually closer to 54 than 53mm and a completely different turbine family .

Yes the compressor wheels are both 71.1mm GT ones but the RS's is a 52 trim where the 2835's is a 56 trim one .

From what I can tell , so far , the GTRs's compressor housing is based on a T04B footprint (backplate diameter) and it is 0.60 A/R .

The GT2835 Pro S's comp housing is supposed to be based on the larger TO4E family and is in 0.50 A/R .

I think the story is that HKS started out with the T3 flanged version of the GT2530 which uses the same hot side as the T3 flanged GT2535 , not sure if there was a T3 flanged GT2540 .

They obviously wanted something with a more modern compressor wheel than a 2535 or 2540 so they opted for the 71.1mm 52T GT compressor and manufactured a port shrouded compressor housing specifically to suit it .

It would be very interesting to back to back a GTRS and a GT2835 Pro S 0.68 A/R on a mild RB25DET .

There's obviously a bit more work in the Pro S as far as its inlet and filter goes and I'm not sure if you can use a std R33 or R34 GTS/GTt airbox with these turbos .

I guess it depends where you want you car to boost its performance engine speed wise and how much you want to spend doing it . The 2835 pro hands down should make more power with its larger GT30 based turbine and turbine housing though sometimes the power figures I've read suggests their outputs are not miles apart . So many engine spec variations and some people push their engines and turbos harder than others .

A .

[simpletool]

Again GT-SS is too small, well it will run ok, but won't make significant more power than stock R34 turbo. People comparing GTRS and 2835 I agree with, these are much more suitable.

GTRS will probably cap out at 240rwkw (this is HEAVILY debated due to one or 2 cars getting more). 1 bar ~3100rpm. It is limited by it's exhaust wheel and housing being a bit small.

2835 prob cap out at 275rwkw, 1 bar ~3500rpm. Cropped turbine model in proper T3 footprint/T28 housing.

The two turbos are a decent amount apart in inlet/outlet area. 2835 is 7% more area on the compressor and 21% more area on the turbine.

[PM-R33]

GTRS will probably cap out at 240rwkw (this is HEAVILY debated due to one or 2 cars getting more). 1 bar ~3100rpm. It is limited by it's exhaust wheel and housing being a bit small.

Far, FAR from only one or two cars pushing more. No way in hell does the GT-RS cap out at 240rwkw.

From what I have seen over the years on the forum the average figure is between 250-255rwkw.

Not many go over 260rwkw (for reference the most I have seen out of mine was 263rwkw on the Microtech with no nitrous).

Edited November 2, 2010 by PM-R33