Rb25 Turbo On A 20

[trxbal]

Just quick question can I bolt a rb25 turbo straight onto my factory rb20det without changing anything ?? Need something cheap cause

Turbo is leaking big time

[Plattsy]

if you can i have one for 250!!! pretty sure you can tho.

[trxbal]

What condition and where are u

[Nic_A31]

You need to tap and drill a provision for the wastegate actuator feed.

[trxbal]

Ok is it easy to do ??

[Nic_A31]

Yeah, but if youre not confident, a mobile thread repair guy could do it pretty cheap.

[r32_det]

I've done three of them and they've always bolted straight up, oil and water lines all match up fine. Try find one with the compressor elbow that has the vacuum nipple coming off it factory, I'm fairly sure they come off the R34 turbos

[trxbal]

Does it make a difference

I might be able to get one off 33 gtst depends on the condition of it

[Nic_A31]

R34 has the feed nipple on the elbow.

R33 has it on the intercooler pipe.

I just drilled a hole, and used an old feed fitting to tap the thread. Bit dodgey. I think mine leaks a bit now.

[trxbal]

Cool

Cheer Man u wouldn't

Be able to load up some pics

By chance

Just ao I can see how it's

Done ?

[Nic_A31]

I can take some tomorrow if you like, or just give me a holla on Sunday if you're at Barbagallo Drift Assault, I'll show you there.

[trxbal]

I was going but I have to go down south for something sadly cannot believe I'm missing out on it

[Nic_A31]

...you should be ashamed of yourself....

Edited September 27, 2012 by Nic_A31

[trxbal]

I am believe me but ohwell hopefully some day soon u should see my girl around barbs hitting the track

[trxbal]

Also did u guys get any power gains from doing this ??

[Nic_A31]

No power gains but r34 turbo spools up quicker.

R33 and r34 turbos are a bit tougher for wear too.

[TTT]

what do you mean no power gain?

RB25 turbo at the same boost the RB20 turbo was set to will produce a fair bit more power.

remember to use the actuator from the RB20 turbo on the RB25 turbo

that way you get 10psi stock instead of the 7psi the RB25 actuator holds.

many years ago, I put a series 1 R33 turbo on an RB20.

with 10.5psi and no tune it made 152rwkw

Also, R33 and R34 turbos are not the same.

R34 turbo has a bigger rear and will be laggier on teh RB20.

Stick to R33 turbo.

just go to an exhaust place, tell them to remove the intercooler piping that goes from the turbo tot he cooler, and tap a nipple to the pipe as close to the turbo as they can.

that is where the vacuum line from the actuator will go.

[34GeeTeeTee]

The one i drive was laggy with the 33 turbo on the RB20 anyway, pretty stock sort of setup.... Not sure if its an RB20 thing or due to the bigger turbo?

[trxbal]

Yeah not really phased by lag just was curious to see if I would get any gains

[CEF33Y]

If its an original a31 rb20det, the water lines have a different (smaller) banjo bolt. can't remember size, m16 (a31) instead of m18( r32, r33) maybe.

Got caught out when I did this on my first cefiro.

So you can get water lines off a r32 rb20, they will work, or make up custom water feed/return lines.

And yeah, you'll see some gains. worthwhile mod if you need to replace turbo anyway.

Edited September 28, 2012 by CEF33Y