Twin Turbo Rb25 Gtst R33

[ylwgtr2]

My advice is to get some experience swinging spanners and welding, like I did, and it's nowhere near as expensive from there as most of it is DIY. Bollocks to buying someone elses kit. Also if you can afford the time, get a mech eng degree too, helps heaps.

 

Ultimately for you to get a workshop to do this will be very Exxy, and they'll love you for the money you'll spend.

Im sorry geoff but i have to disagree with the mech eng degree thing.....You dont need a peice of paper to tell you how intelligent you are......I have met many of these types of degree people and hardly ever see any decent prac work.My advice would be trial and error...its the best way of learning.

[jeffworld2]

hey mambastu can we get more details on your setup? what manifold u using? If i did twins i would want low mount in my gtst preferably with the stock piping, pretty much what you have in your silvia

[Jago]

HEY GUYS I WAS JUST FLICKING THROUGH EBAY TODAY AND NOTICED THIS , HAS ANYONE EVER SEEN A TWIN TURBO RB25?????http://cgi.ebay.com.au/ws/eBayISAPI.dll?Vi...me=STRK:MESE:IT

No, but i've seen twin turbo RB20, i own one

[aphid]

as to your thoughts on hacking up the stock manifolds and welding on a new flange, being cast iron i would've thought that that would be a tad dodgy if it would even work at all? can somebody enlighten me

[discopotato03]

Geoff would cut/shut manifolds be easier than welding a couple of bosses on the exhaust side of the head so that it had both RB25 and RB26 stud pattern ? If possible/practical it leaves all options open for 25 or 26 heads .

Cheers A .

[Munna1]

single bolt on turbo would be a much cheeper option

[sh@un]

as to your thoughts on hacking up the stock manifolds and welding on a new flange, being cast iron i would've thought that that would be a tad dodgy if it would even work at all? can somebody enlighten me

You can stick weld cast iron no worries.

[GTRgeoff]

I went ahead and did this, cost about 3K and over 30 hours of my labour as I welded a custom hard pipe inlet to single AFM. Then it died a couple of kays into the first drive when the front turbine failed and blew back into the cylinders giving me no compression on 1,2,3.

Cheaper option is RB26 head or a bigger single. I just wanted something a bit unique.

The way the manifold bolts up after the cut and shut is a real pain in the ass and needed a fair bit of massaging as a couple of the studs are in tricky spots. Not really sure on the extra bosses but it would certainly be an option and make for easier boltup.

I'd recommend either an RB26 with custom sump or a 26 head or a 25/26 head on 30 block. After a year or so of the GTR33 I very much like the six throttle response so I'm working in that direction for the track car. Yet to get into it after so much time out with surgery.

[NickR33]

Geoff are you leaving the twin setup on the 25? or you want to sell it to me:)

I am looking at the full HKS GTRS kit but I have a forged pistons in my 25 and would really like a responsive 300rwkw, I think some steel wheeled 34 turbos would do the trick nicely!

Would I be well served to look at a whole 26 head? or am I being crazy and should just go for the GTRS..... hmmm

[Munna1]

Go for the HKS PRO-S NickR33 should make 300rwkw+ with cams ect. You will be strugling to make 300rwkw that with a GTRS but it has been done before.

There is on for sale on this forum at the moment.

cheers

Edited September 1, 2006 by Munna1

[NickR33]

Iv'e got tomei cams in there so I was hoping with a fresh motor and cams the GTRS would get me to 300... seriously been looking at the Pro S too...

... still, I do want twins for some reason... don't know why but twin GTSS's or N1's floats my boat... they sound so nice spooling up and would work really well on a GTSt with lots of sticky rubber and good suspension bits

...its Friday I'm allowed to dream lol

[Munna1]

Fair enough NIC would certainly be interesting to see, id imagine two GT-SS turbos would be a lot lagier than 1 PRO-S but at least it would be something different.

[GTRgeoff]

I'm not convinced I won't redo the same thing again, depending on what falls into my lap at the right time. Then again a 26 with a pair of Garret GTSS equivalents would get it going quick enough.

[Jago]

erm, anyone thought of adaptor plates? Im using adaptor plates and standard RB26 manifolds, that way i don't have to screw around with custom made stuff, i can simply buy GTR turbo kits.

[gtst25]

Yes that's how I would have done it. A pair of gtss turbos are similar in price to kits like the pro s etc like I bought and I've seen adapter kits somewhere... If you use your brain and can swing a spanner I can't see why it would be more expensive.

How's the rb20 going at the moment?

Cheers

erm, anyone thought of adaptor plates? Im using adaptor plates and standard RB26 manifolds, that way i don't have to screw around with custom made stuff, i can simply buy GTR turbo kits.

[jeffworld2]

wherefore to get these adaptor plates? anyone have any? Or have i got to make one up

[GTRgeoff]

In my case it wasn't the adaptor kits, it was the single afm piping and the braided hosing for oil and water. R34 turbs were only 800. Felt really punchy on the first drive too. Higher compression ratio and R34BBTT is a good combo, brings on boost almost as fast as my highflow single but it ran out at 220rwkw. buckets of power down low though.

I didn't go with the adaptor plats as I didn't want to push too close to the shock tower.

[jeffworld2]

i'm heading down the road of a twin turb rb25, and although its too late now i was considering getting a custom manifold made to position the turbos in the same spot as they would be on an rb26, so i could use all the piping and ideas from the 26 setup. Pretty much a 26 manifold with 25 head flange, i didnt go down this path as another oportunity came up. What are your thoughts on this idea, my engine is still in pieces so its not too late to change, if it will end up cheaperish

[paulr33]

big or medium single

easier

cheaper

less crap

less hassles

[Kaido_RR]

wherefore to get these adaptor plates? anyone have any? Or have i got to make one up

can get them off yahoo auction,

the same people that make the adaptor plate for rb26 plenum for the rb25. make they manifold adaptor plate. and they arnt too $$$