GTS-t / GTR driveline and engine comparisons

[Chris Wilson]

I am toying with building / buying a GTS-t for the weight saving over a GTR for some track day fun. Was envisioning selling the stock engine and fitting a GTr lump, but perhaps someone can also tell me the exact differences in the engine, as far as block casting, crank, rods and head casting is concerned? Are low compression forged pistons available for the GTS-t block? Steel rods? Will a GTR head bolt straight on, or is it completely different? I know a fair bit about the GTR, having rebuilt (successfully....) several GTR engines with mildish mods for myself and customers, butknow little to nothing about the GTS-t engine. Pointers to sites with this info welcomed.

Whilst I think the GTR is unbelievably "clever" the weight of things conspire against them, my R33 GTR V Spec cost a fortune to run on track days as it plain ate tyres, AP six pot discs and expensive pads, and 2 gearboxes...

Thanks.

[Beer Baron]

Hi mate,

There are many similarities between the RB engines. And yes there are many aftermarket RB20 parts available from all the usual Jap brands... Only problem with your GTST/GTR is that it will eat rear tires even faster than your GTR ate its...

You're right though, it will be a fun car.

Richard

[Duncan]

actually Chris, if you want to be over the top about it, use one of the rb30 blocks we have down here with an rb26 head....they go OK....thread is here http://www.skylinesaustralia.com/forums/sh...ead.php?t=15420

And I totally agree, the gtr is a heavy bugger and expensive to run

[Sydneykid]

I am toying with building / buying a GTS-t for the weight saving over a GTR for some track day fun. Was envisioning selling the stock engine and fitting a GTr lump, but perhaps someone can also tell me the exact differences in the engine, as far as block casting, crank, rods and head casting is concerned? Are low compression forged pistons available for the GTS-t block? Steel rods? Will a GTR head bolt straight on, or is it completely different? I know a fair bit about the GTR, having rebuilt (successfully....) several GTR engines with mildish mods for myself and customers, butknow little to nothing about the GTS-t engine. Pointers to sites with this info welcomed.  

Whilst I think the GTR is unbelievably "clever" the weight of things conspire against them, my R33 GTR V Spec cost a fortune to run on track days as it plain ate tyres, AP six pot discs and expensive pads, and 2 gearboxes...

Thanks.

Hi Chris, which GTST are we talking about here, R32, R33 or R34? What engine, RB20 or RB25? Are we talking 4wd RB20DET, 2WD RB20DET. 2WD RB25DET or 4WD RB25DET? Almost everything is easily interchangeable between RB26 and RB25 (except manifolds). You can even use an RB26 crank and rods in an RB20. So you need to be very specific about what you want to know.

We have an R32 GTST circuit race car with an RB30 bottom end and an RB26 top end, it uses a R33 GTST (RB25DET) gearbox. So you can see how much is really interchangeable. I reached the same conclusion as you have, it costs a shootload more money to run a 650 bhp 1,600 kg 4wd than it does to run a 650 bhp 1,200 kg 2wd.

So ask away, but be specific with the questions, otherwise I can't answer.