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Turbo Problems

quik_silva

By quik_silva,
in Engines & Forced Induction

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quik_silva Rookie

quik_silva

Posted
Posted

Hows it,just wondering if anyone could help me out.

I just put a RB20det into my skyline and when i was putting it in i didnt bother to check the turbo out,i just assumed it was a factory one.

So with the new motor in i take it for a spin,now factory turbos start to spool up around 2g,well this one didnt start till bout 4g and then went hard from 5gs on.So i go home pull the turbo off (assuming something is wrong with it)and put an RB25DET turbo on it.So i drive around with this one on for about a day and man wat a difference,yea it spooled up quicker but it just didnt have nowhere near the kick my old one had.

So i was wondering if anyone knows of a good place in auckland where i can get my old turbo recond or get the bits i need to recond it myself.Also any tips on how to get my turbo spooling up faster.cheers

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MANWHORE Grand Master

MANWHORE

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Posted

rb20s just don't really have much spooling power to start off with. I would say that you were fairly close to the mark with your stock rb20 turbo. Naturally, since the rb25 one makes mroe power, it will spool later.

Apart from the usual - freeing the intake - filter, fmic, freeing up the exhaust - highflow cat, dump/front/catback, there is not a lot you can do

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quik_silva Rookie

quik_silva

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rb20s just don't really have much spooling power to start off with. I would say that you were fairly close to the mark with your stock rb20 turbo. Naturally, since the rb25 one makes mroe power, it will spool later.

Apart from the usual - freeing the intake - filter, fmic, freeing up the exhaust - highflow cat, dump/front/catback, there is not a lot you can do

Yea ive done full 3inch exhaust,Mi-tec fmic,apex pod,hks ssq bov,dual stage boost controller and thats about it engine wise.

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TTT Grand Master

TTT

Posted
Posted

it's not a stock RB20 or RB25 turbo.

possibly a stock VG30 which would explain the crappy spool time followed by crappy top end.

Stock RB20 turbom from silver top RB20 has 16v on the compressor cover.

stock RB25 turbo's have either 42v3 or similar on the comp cover.

exhaust wheel looks to be ceramic still. but it is definitely bigger than the 20 and 25 wheels.

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TTT Grand Master

TTT

Posted
Posted
its not a vg30 rear wheel..its a high flow of some sort.

Why is the vg30 considered a bad turbo? It is BB - has the same comp cover and wheel as the R33 turbo and the same exh housing as the R34 turbo (larger)..

Cause it's a turbo designed for a 3L and he had it on an Rb20.

it's not a good turbo for it.

but as you said, it's not a VG30 turbo so I'm not sure what it's from then.

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MANWHORE Grand Master

MANWHORE

Posted
Posted (edited)

The reason why they say that the STOCK vg30 is a pos is because it is basically an rb20 turbo internal put inside an op6 exhaust housing/45v comp housing (of course this differs between the many different versions of vg30s - at one stage, I had 4 different models of vg30 in the workshop).

Edited by MANWHORE
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