Greddy T517zs Vs Garrett -5s Vs Hks 2530 Kais

[wogzilla34]

Hey guys i need all your advice lol

So i currently am running greddy t517zs/10cm housings on my 34 with a fully built 2.6 litre motor... 8:5:1 compression, forged pistons,rods, type b poncams,cam gears,e85...the list goes on. I made 403kw on 22psi as the injectors were maxed out.

The thing doesn't hit boost until 4000rpm and full boost at 6000rpm and drops off at 8000rpm. Now i do like the turbos but i hate that they are quite laggy. Im after response and still want to hold good power.

Im thinking of getting the -5s and putting KTS billet compressor wheels in them and going from there but I've also heard good things about the HKS KAIs.

The car is purely a street car, i do drive in the hills a bit but i don't do track days or drags etc. Like i said i want good response and still want to hold the power.

Please help me my fellow GTR guru's

Edited January 23, 2015 by wogzilla34

[Piggaz]

What cams, compression?

[wogzilla34]

type b poncams, 8:5:1

[Mick_o]

Why not go to 8cm housings instead? Might be the cheapest way out to pick up some response and the tune will probably only need a tickle up which may keep costs down too.

The 5's will be the most responsive out of your options there.

Are you purely a twins kinda guy?

Edited January 23, 2015 by Mick_o

[wogzilla34]

I have thought about going the 8cm housings as that is an option. And yes its twins only for me mate...i hate big singles on GTRs unless they are purely set up for drags i think singles are pointless

Its more fun with twins

Edited January 23, 2015 by wogzilla34

[Mick_o]

Thing is those turbos are pretty big for a 2.6L & stock compression ratios. Even changing housings may only net you 500-600rpm (being optimistic) which still only brings you down to 5500.

The 5's will net you over 1000rpm of response and probably pick up another 20 or 30kw up top if ya setup is good

[wogzilla34]

Thats what I'm thinking too...plus i want ball bearing not bush bearing so the -5s will work just fine i think with my set up. Too much to choose from lol

[Piggaz]

Start playing with the cams. Has it got cam gears?

[R31Nismoid]

Why not go to 8cm housings instead?

Problem is he will lose the power in the top end. If going to 8cm housings, better off just putting -9s on and have the most blistering response possible for the 330-340rwkw marker. (Although with 8cm it should make a tad more).

517s have never been as good as -5s... I don't think saying you can pick up 1,000rpm response is entirely accurate by the same token. They start coming on by 4,000rpm as his 517s, they are just "all-in" if you will, a lot sooner depending on the setup.

Have been in two cars now that went from 517s to -5s - it's a noticeable difference...

Although really, 20psi or more should be well and truly in by 5,000rpm so me thinks issues with cam set-up as per Piggaz comments are heading towards. Would start there before pulling turbos off, you might find a fix without going through a 3.5-4k expenditure.

[pol1on1]

I'm not being smart or an expert but when I'm thinking of turbo's and what my future build with.

I found a topic that I enjoyed and most post with pictures.

read the line graphs see what you want, theirs over a 1000 posts

Read all you will definitely find someone with same setup that you desire

And reading the charts you can really see when high HP turbo's kick in>_>

http://www.sau.com.au/forums/topic/93880-rb26-turbo-upgrade-all-dyno-results/

[Roy]

As someone that ran an 8cm , 10cm and 12cm housing on the same 2L engine and a TD06 I can tell you the 12cm housing made no more powre than the 8cm. Just wasy waaaaay laggier. Changed to 2.5L and the 12cm was still too big.

My point, changing from win 10cm housing to 8cm will be fine and make the car far better. When I went from 10cm TD06-20G on my RB20 to 8cm this was the difference

So go to the 8cm...all imo

[XKLABA]

I'm with Roy, go the 8cms and get rid of the Type Bs in favour of stock or Type Rs and dial them in and you will pick up more 1000rpm in response

8cm = .57 A/R

10cm = .75 A/R

[luke gtr]

What dumps and exhaust?

If the back end is restrictive, it can greatly affect it.

Going off what you have listed, I'm assuming theyre done, but you know what they say about assuming.....

[sinistaGTR]

2530s, 454kw on E85 24psi, Type B, 8.5:1 compression

Responsive and nice to drive..... just saying