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Rb25 Turbo Nipple

eXc

By eXc,
in Engines & Forced Induction

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eXc Mentor

eXc

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Hey Guys,

I am putting an RB25 turbo on my RB20 in the next few days, I just wanted to know where I should put the nipple for the wastegate hose.

Should I put it on the compressor housing? Or on the intercooler piping? Do I get it as close to the compressor housing as possible or doesn't it really matter?

Does it matter how long that hose is? I have a mechanical boost controller, I was thinking I might mount in a different spot, but it would mean that the line would be about 2 foot long at a guess.

AI spose I will find out when I get the turbo off, but where does the standard RB20 one connect to? Obviously I have read that I will need to add a nipple in, I am just curious how the RB20 one works then.

Much appreciated :wave:

Chris

Edited by eXc
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rb20inside Community Regular

rb20inside

Posted
Posted (edited)

as mentioned, tapping a hole in the comp cover works well.

you can also weld a nipple into the intercooler piping at a convenient location.

either options works fine depending on what tools/equipment you have.

the length of the vacuum line does have an effect, how much... depends.

the shorter the length the better but its not like going from the 150mm of the rb20 line to 600mm in your custom location will be overly noticeable.

i have heard rumours that some rb25 turbos require different fittings to allow the water lines to fit up to a rb20 but i have never come across any problems when fitting three different rb25 turbos to three different rb20s and two vg30 turbos to a rb25 and a rb20.

Edited by rb20inside
eXc Mentor

eXc

Posted
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Posted

ok, I put it in the compressor housing.

I needed to change water lines. Predator - I have posted in your Tutorial thread on how to tell this, thought you may like to add it to your guide for future people? Basically if it's not a 24mm head on the water lines, you will need different ones (mine were 22mm)

Getting on dyno at 12:30 today to check everything out. The turbo is making a heat related smell. I am hoping it's just cause it's been sitting in this guys garage for 3 months or whatever.

Appreciate your help guys :)

Cheers

Chris

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