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Twin Turbo Rb25 Gtst R33

code blue

By code blue,
in Engines & Forced Induction

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GTRgeoff Grand Master

GTRgeoff

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Just noticing that the silicon hoses aren't clamped and the braided oil lines stick way up and will rub the bonnet so they could have used banjo feeds. Also looks to be oil only turbos with no water cooling. I'd want to see their dyno chart first for this "prototype".

Call me picky but I think you'd get a nicer job done with R33-R34 turbos at a much cheaper price including the dumps and injectors, but then I do my own work.

At 15psi, what are GTR's pulling peak power-wise? How laggy will this setup be through standard GTSt throttle body at just 15psi? And with an extra injector and controller it's a bit of a bandaid/gamble considering the fragility of the stock GTS pistons.

I won't be reaching for my wallet until I see the dyno chart on hot and cold days and feel the driveability.

code blue Enthusiast

code blue

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hmmm i dont see how the 2 setups can be compared??? first the cost factor of transplanting an rb26 ??? can the standard gtr engine and turbos put out 300kw@wheels?? its obvious which of the two are a better engine thats not the question here . it all comes down to what you can afford??? i know that i dont have the sort of money required to fit rb26 ( although it would be nice ) some of us are left to modify our rb25s . ok guys with your gtr engines good luck to you dont try and burst our bubble here , anyway it would be interesting to compare this system fitted to rb25 ( stock engine ) againts a stock gtr call me crazy but isnt what all this is about anyway i have emailed the guy and he lives close to where i work so i plan to get some more info for you guys cheers

Sciby Experienced

Sciby

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hmmm i dont see how the 2 setups can be compared??? first the cost factor of transplanting an rb26 ???  can the standard gtr engine and turbos put out 300kw@wheels??

Stock internals will deal with 300+rwkw in an Rb26, so the rumours go, but you'll need A/M turbos... maybe cams. An RB25 will not deal well with 300rwkw... you're on the edge of things flying out the side of the block. Best to rebuild it, which is your first extra cost.

Personally, I think the RB25DETT deal sounds too good to be true. What about the hidden costs? It doesn't include AFM, and if you're wanting to use the stocker with twin turbos, that's silly, it'll be a huge restriction. If they have it set up without AFM's, and you don't have a MAP'ing ECU, you're up for more cost. On the topic of ecus, if you do use the stock afm, about the stock ECU? Will it cope with two turbos? What about boost control? What about oil and water points off the block for the second turbo? The sale says it's got piping to the pod filter, you're going to want two filters with two intake pipes, to feed the turbos properly, etc etc etc...

All these little things will have to be addressed and may (read: will) cost you more than you expected...

Don't get me wrong, I'm all for going nuts on the car (I'm in the market for a new turbo myself), and I've looked at and priced up the twin turbo path for my rb25 before, and it's a great idea, but it's definitely not a cheap exercise, ebay item or not. Lots of little things that have to be taken into account. It may end up costing you just as much as an RB26 transplant. It'd be unique, but a waste of time and effort, imho.

Just be VERY careful and do your homework before you jump into it. Question everything they tell you, and you hopefully won't get burnt.

Roy Grand Master

Roy

Posted
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My only concern with a TT setup on the RB25 is the strength of std pistons, but isnt Steve in SA proving the theory of RB25 strength (or lack of) wrong as he has modded his car intelligently an completely and is making pin up boy power.

Outside of piston strength which a well tuned and setup 300rwks seems possible then the only other thing is cost of fiddly crap. If you could be bothered doing the fiddly stuff yourself then i say go for it.... std GTR gear is cheap, and to the ppl who arent chasing Apollo Mission to Moon power figures, can mean a budget and interesting/entertaining upgrade.

Roy Grand Master

Roy

Posted
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It all comes back to labour costs... something i regret not considering when chosing a profession. once again working on a Sturday (worked 32hrs straight Thur-ri) and dont get paid an additional cent. Sadly mechanics dont work for free and they will be charging you to remove - play - install and tune

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