What To Do?

[Kruges]

Hey all, just after some advice with a turbo centre ive aquired. im changing my turbo on my rb20 in my r32 from the kkr style turbo thats in it now to something more responsive. I have already purchased an r34 gtt turbo with the op6 housing that i will be using in the mean time, however i have a garrett centre part number, 466541-4. or more commonly know as a gt2560r/gt28r. anyone know what housing i need for this centre? is it possible to use the housings on the r34 turbo? maybe another housing? any help will be much appriciated as im new to playing with turbos.

cheers, sam

[JonnoHR31]

standard 34 housings will need machining to fit that core. best to contact a turbo specialist such as gcg, hypergear, mtq etc

[hypergear]

We can machine your OP6 housings to suit a Garrett GT2860RS Disco core which makes it very similar to a HKS2530. Would max around 220rwkws with plenty of response on road. Since its a .63 rear you also might want to use a 52T GT2871R CHRA, which gives that little bit of extra power and torque.

[Kruges]

pm sent to hypergear. thanks for the fast replies.

[discopotato03]

Most people find the BB VG30 turbo laggy on RB20's mainly because its turbine housing is intended for an engine half as big again and its not like your going to rev an RB20 50% higher .

Also note that Nissan used that larger Hitachi turbine housing on RB25 Neo's but they had a more sophisticated variable cam drive system (than R33s) to help keep the dynamic compression ratio up at low revs .

As far as I know RB20s didn't get VCT so using a large turbine housing is going to make the turbo pretty lazy on them .

As I mentioned elsewhere I think a re-machined Hitach RB25's turbine housing , which is a little larger internally than the RB20s one would give a bit more flow area and allow you to make a bit more power without excessive turbo lag .

BTW I KNOW the 25 housing is a little larger than a 20's one because I have all three sizes here and measured them internally .

They don't look a whole lot different but they are and I know it to be fact .

RB25 turbo bits are common and cheap so I'd use an RB25 housing as a first try . Its the next size up from what you have and has the best chance of not being a laggy pig on a two liter six cylinder .

Your call , cheers A .

[Kruges]

so with all this in mind, if i was to send my rb25 op6 housings to be machined to fit the 466541-4 would it be a worthwhile upgrade for my rb20 or would i be better off keeping with just the standard rb25 turbo. my main concern is that ive been told that the rb25 turbo still has the ceramic turbine wheel. sorry for all the questions.

[kwickr33]

R33 turbo still has a ceramic turbine wheel. You won't be able to run more then 12psi safely out of it. get hypergear to high flow it with steel wheels. that would work pretty sweet on a RB20.

[Kruges]

r34 neo turbo also ceramic wheel?

[kwickr33]

obvious. its also got a plasdick comp wheel.