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Just Installed R33 Turbo In Rb20det

allthewaytotheskyline
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green 33 Explorer

green 33

Posted
Posted

i had a S2 turbo ran 13psi on weekends or when on spirted drives oh and 1 drift comp and turbo lasted about 3 or 4 months, then one day just on low boost low revs turbo decided it had enough, now funnily enough most problems with these turbo's is the rear ceramic wheel flying apart but in my case i blew a chunk out of the front wheel the size of a 10cent piece, so maybe the good tune can protect the rear wheel but in the end at that boost the turbo is most likely going to go, but good luck hopefully you will get a bit more life out of her

WazR32GTSt Grand Master

WazR32GTSt

Posted
Posted (edited)

the turbo is rated according to SAU users at running no more than 12psi on an rb25

now remember that at 6000rpm on a 2.5L motor there will be more exhaust gas going through the turbine that at 6000rpm on a 2.0L motor. this means that the exhaust gas temp will be higher on the rb25 than on the rb20

this means that the same turbo on a smaller motor can easily handle 2psi or more because the same turbo at 14psi on a 2L motor is doing about the same work as 12psi on a 2.5L motor

i ran an rb25 turbo on my rb20 for about 1.5years at 14psi and the turbo ran happily all day every day with me driving it like i stole it!

Edited by WazR32GTSt
nuclear_skyline Mentor

nuclear_skyline

Posted
Posted

I had mine running 11psi... Was driving down hill and let off the accelerator and BOOM!!!!! both wheels disintergrated! run 10 pound if u must but no more...

FATAZZ Grand Master

FATAZZ

Posted
Posted

Just putting it out there.i did see my turbo hit 24psi when first installed it and its still in good form.

they can take it,but for how long and is it any benefit over the usual 12psi.

FordyR31 Mentor

FordyR31

Posted
Posted (edited)

I dont know if u've found ur problem yet or not but it could possibly be either a gasket leak between the manifold and turbo or u may possibly have snapped 1 or more of the 4 studs that hold the turbo onto the manifold... I had my RB20 doing the same and a mate found out that one of the studs was missing and a tiny bit of gas was leaking from there making a little high pitched whizzing noise..

Just to note i ran an RB20 turbo actuator (10psi) all day on my 33 turbo and with the 3 inch exhaust gained 1 or 2 psi on top of that depending on the conditions. I always thought the turbo was stuffed but it was just a tiny leak.

Liam

Edited by FordyR31
Green_s13 Proficient

Green_s13

Posted
Posted

did you change the gasket when you did the turbo?

i have an rb25 turbo on my rb20 and i have no odd noises but i changed the gasket, i have a friend who didn't and he has a similar noise to what you say

allthewaytotheskyline Mentor

allthewaytotheskyline

Posted
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thanks for the heads up guys...im going to get a malpassi rising rate fuel pressure reg or a nismo one and ive got a apexi n front mount, exhaust, ebc so im hoping to tune up the safc next weekend and bring the boost up to 14psi....hopefully see the 190rwkw mark.

mattymagoo22 Community Regular

mattymagoo22

Posted
Posted

Correct me if I'm wrong but i'm pretty sure that the rb25 series 2 R33 have a nylon compressor wheel, which may cause it to sound a little different to when a steel wheel is spinning up? if this is the turbo you're using it may be the reason, when I changed

mine over from standard to hks 2530 totally diff noise when spinning up.

Just a thought.

SPINR33GTS Apprentice

SPINR33GTS

Posted
Posted (edited)

15 psi for 40 000km is all i have to say :) noticeabley runs about 10-15 degrees hotter but thats not the end of the world. Nethign over 15psi seems to hit boost cut but just on 15psi seems fine day in day out lol for a daily R33.

Turbo still going strong but has since been set to 10psi for fuel consumption savings lol plus doesnt liek 15psi and stock smic oh hot days on cold days though 15psi all day.

At the end of the day the turbos are cheap and everyone would rather upgrade their stock turbo eventually neways.

Edited by SPINR33GTS

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