Engine conversion... I know this sounds a bit stupid...

[Hellboy]

Hi guys! I'm new here but I've been reading quite a lot before I registered as a member and learnt so many things. (Well considering that I know nothing at the beginning...)

Anyways, here's my questions. I often hear people talking about transplanting a RB26DETT into their GTS-T. But can you actually replace a RB26DETT in a GTR with a RB25DET engine. I know this sounds a bit weird but really I have no idea about this. Just curious. Can anyone help me here? Thanks!

[silverR32]

yes

it is stupid

[wylie]

i dont think anyone has ever tried it or ever will try it. it would probly work fine though - i wonder what ppl would say when u see gtrs getting around with GTS25t Badges on them hahaha

[deano_82]

wow good idea........... you should really do it no do it... bacardi and cola do it doit

why would you bother wondering about this! why not put a twin spark ca20 in there or a diesel hilux motor!

do it do it

sorry man just in shiat mood, but yeh prolly would go in easily, but no one will ever know!

[Kaido_RR]

yes it can be done, there is a race built r32 gtr in perth running a rb25 block and rb26 head (i belived he damage his block and swap to the 25 after that happen)

the reason why people dont do it cuz the rb26dett is a much better and suited engine for the gtr

[Hellboy]

Yeah! I should have known it will work. This actually started as a discussion between two of my mates. I bought this up just to see what you guys think. Thanks guys!

[Warpspeed]

Anything is possible, but.....

The 4WD blocks are different to RWD blocks. The 4WD has the front diff mounted in the sump, and the sump and oil pan rails are further apart and quite different on the 4WD blocks.

If you really want to fit an RB25DET it would have to be from a Stagea 4WD. Or you could use a non turbo RB25DE block from an R33 GTS-4 which is also 4WD.

While you can put an RB26DETT into a GTST, by butchering the sump a bit, it would be pretty difficult to go the other way. There is a company somewhere in NZ which makes an adapter plate to fit the 4WD sump to "normal" rear wheel drive RB engines. Guys that fit RB30 blocks to GTRs use this plate, or have to make up something similar themselves.

Apart from the oil pan rails the RB25 and RB26 blocks are pretty much identical. Cranks, rods and pistons can be swapped either way, and drop right in.

You can build up an RB26DETT using an RB25 block for a GTST and all the GTR bits. This keeps the old RB25 engine number (hint) and the original skinny sump.

[N I B]

We only fitted the RB25 to the GTR race car to meet WA race rules of the time that only allowed 2.5L 4valve turbo engines but thats changed now and so has the race cars motor.

[Parag0n]

RB26DE with triple webber carbs running a big single blow by turbo