Twin Turbo Rb25 Gtst R33

[gtst25]

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.

Hi Geoff,

What's the status of the '33 now? I'd love to see the results if you got it back together - I've never minded a bit of hard yakka for a good result - hell working on my r33 is one of my hobbies. If the job was done right it'd probably look neater than a lot of single turbo kits around. Do you have any under bonnet photos?

Cheers

Edited September 2, 2006 by gtst25

[Jago]

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

RB20, well, it's dead at the moment. I suspect previous owner didn't really look after it, one of the turbos has a leaking seal, so was getting low on oil all the time. So, one day, i launch is, clutch fan goes into the radiator and at the same time i develop a nasty case if piston slap at 3000rpm and over. Im sourcing things for a cheap bottom end swap for a temporary fix, then i am planning a much more serious rebuild with the left over bottom end, have some contacts in japan so yea parts parts parts. It's a long term thing, going to be drawn out over a few years probably, most likely going to involve a solid lifter conversion to use high lift cams, stroking to RB24 using forged internals (including forged rods) etc. So just space it out over time. The eventual plan is to get a decent-ish setup, and try using twin HKS 28 series turbos on the RB24, or something similar, try to keep the twin turbo theme going I don't see why i couldn't use it seeing i've heard of people using a T88 on an RB24 over in Japan.

Anyway, adaptor plates are the way to go, lets you use off the shelf turbo kits rather than custom manifolds all the time. I'm not sure if they are a mass produced item, best get them custom made anyway. So yea, speak to a mechanical engineer or your tuner or someone about it.

Mind you, the twin turbo setup has potential, as i pretty much hit bang on 200rwkw on the SAU dyno day, stinking hot and humid day, internally standard RB20 on only 13psi boost, usingstandard R32 GTR turbos