Swap Rb25 Turbo Onto Rb20

[ORIGIN]

Hey guys got an rb25 turbo and would like to put it on my rb20 on the days off, just wondering if its a straight swap or do i need to make new oil/water lines? or are the fittings differant?

Cheers Fellas

[D3LTR33]

Hey mate,

I did the swap about a year ago now so if i miss anything someone help me out. Its not too hard, a simple swap with oil/water lines. The only part you need is the rb25 turbo elbow from memory. You should get new gaskets (exhaust and turbo manifold) too while you doing it. Also i used the rb20 actuator because its a 10psi spring as opposed to the 7psi rb25 actuator.

Hope that's everything if anyone can confirm. Good luck

[ORIGIN]

sweet i was hoping it would be easy, any mods needed to the intercooler pipes? how did you find the turbo on the 20 worth the swap? i got a series 1 r33 turbo....

[D3LTR33]

I got the s2 rb25 turbo, bolted straight on. Just had a look under the hood to double check, the turbo and exhaust bolt straight on, its the elbow going to the intercooler that you need from the rb25, i had to get a few new bolts for it too because i snapped the old ones tightening them too much, may have been fragile because of their age? not fun trying to get the half bolts out lol.

Apart from basic maintenance i hadn't done much before so just followed internet instructions. Didn't notice too much power difference but might just be my car, i didn't have the money to spend on a nice gt2530 or anything so wasnt expecting too much difference.

Let me know how you go

[battery]

depends on the year of the rb20 some use different size banjo bolts on the fluid lines

[bubba]

Really early RB20's use a different size water banjo I think it is.

It will go a lot harder with the 25 turbo than it did with the stocker.

[R31Nismoid]

There is a link in the FI Guide...

http://www.skylinesaustralia.com/forums/Rb...et-t109753.html

Not sure how you missed that if you searched - would have been the first result

[Omurru]

Been looking into this lately and it all seems fairly straight forward, I'm just sorting out all my parts to do it at the moment, doing a few other things while I have the turbo out. I have a spare elbow if you need one, I bought it and then the turbo I bought came with one anyway $60 posted (what I paid for it) and it's yours.

[ORIGIN]

cheers for the info guys, was just contemplating weither or not to do it but considering i got it for free of a mate and its in good nick, why not even if its just a little performance boost, currently running 12psi on my stock 20 turbo would like too run 14psi on the 25 and see how that goes...

P.S. Cheers Omurru but i got the elbow with the turbo

[bbe]

25 turbos pull alot more its very noticeable be best budget upgrade you can do.

also im a fan of boost an even know the 20 an 25's both run ceramic the 25's fly apart quiker and easier in my experience so id keep it to 12.

that said thou im sure others have had no problems on 14 .

goodluck with it all.

[bubba]

Do it, you won't regret it. Probably the cheapest 50hp out there..

My RB20 made ~195rwhp @ 14psi untuned through an 20 turbo.

Bolted a 25 turbo on and it made ~250rwhp @ 12psi untuned. Tried to run 14psi but it pinged and I didn't want to pull any timing.

Just be aware it will be a bit laggy compared to the 20 turbo but it will pull hard all the way to redline.