The perfect twin turbo system RB26

Discuss the RB20, RB25 and RB26 series engines.
BHFR-GTR
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i had a set of garrett 2860's on my 26 before i decided to go with the gt40. i had the version that flowed the most i can remember either the -5 or -7's anyway i just wanted you to know that even thought they are said to be direct bolt ons they are not, they will bold to the exhaust mani's and intake tube, but the oil dumps and feeds + the water feeds all had to be remade the water returns are the only lines that worked


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Coolwhip
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BHFR-GTR wrote:i had a set of garrett 2860's on my 26 before i decided to go with the gt40. i had the version that flowed the most i can remember either the -5 or -7's
To clearify, those would be the -7's aka R34 N1 turbos. Nice turbos they are

ATpossible
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BHFR-GTR wrote:i had a set of garrett 2860's on my 26 before i decided to go with the gt40. i had the version that flowed the most i can remember either the -5 or -7's anyway i just wanted you to know that even thought they are said to be direct bolt ons they are not, they will bold to the exhaust mani's and intake tube, but the oil dumps and feeds + the water feeds all had to be remade the water returns are the only lines that worked
are you serious? how come garrett says direct bolt on? did you have something different before that maybe someone has before you changed the lines?

wow this is news to me and would have to go into consideration as well. thanks for the heads up and i look forward to your response.

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Coolwhip
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because they use the same flanges as the GTR.

Carlos, can attest to the fustration of matching up the turbine outlet flanges with some outlet dumps.

Well, the GT2860's can swap over your dump pipes, intake inlets, and hot pipe.

I always suggest to change your oil lines anyways, when doing a turbo.

Thats like changing out a bad brake caliper and leaving the old brake line.

But you can't always expect direct bolt on in these cases hence oil lines.

ItzGenX
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Coolwhip wrote:
To clearify, those would be the -7's aka R34 N1 turbos. Nice turbos they are
-5's are the higher flow of the two. -5(360hp) -7(310hp)The -7's are the lower of the two and was found on N1 engines.

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Coolwhip
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ItzGenX Coolwhip

Thanks for catching that

ItzGenX
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BHFR-GTR wrote:i had a set of garrett 2860's on my 26 before i decided to go with the gt40. i had the version that flowed the most i can remember either the -5 or -7's anyway i just wanted you to know that even thought they are said to be direct bolt ons they are not, they will bold to the exhaust mani's and intake tube, but the oil dumps and feeds + the water feeds all had to be remade the water returns are the only lines that worked
It is actually somewhat expected. R32 and R33 RB26 turbos are usually journal bearing T28's with ceramic turbine wheels (almost exactly like S14 SR20 turbos except for ceramic wheel). The late model R33 and all R34 turbos were switched in favor of the GT2556 turbo, which was ball bearing and steel turbine wheel. Ball bearing turbos use different types of lines then your traditional journal bearing CHRA. Nothing a short roll of braided SS lines and some earl's fittings can't handle.

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wagzilla260rs
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BHFR-GTR wrote:i had a set of garrett 2860's on my 26 before i decided to go with the gt40. i had the version that flowed the most i can remember either the -5 or -7's anyway i just wanted you to know that even thought they are said to be direct bolt ons they are not, they will bold to the exhaust mani's and intake tube, but the oil dumps and feeds + the water feeds all had to be remade the water returns are the only lines that worked
I'm having that same problem bolt ...on....only one part of it will bolt on....you can spend lot's of money a&n fittings ...where dose it end????

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StricNyne
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yeah i am very inclined towards twin -5 myself they are basically the biggest bolt on solution, once i get my money right of course, and i have some safety mods i want to look into such as oil coolers and radiator, and my rad support

BHFR-GTR
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yes then they were the -5's then cause they were the 360 not the 310, the outlets and dumps would work i had them bolted on, but of course they had to be modified to fit past the steering shaft. and all my lines were stock the oil returns and water feeds, none of the sizes were correct. the water feed is bigger on the turbos and the dumps were way to long if u used the stock ones, and they wouldnt bolt on. the water return lines are on there in that picture but thats it, everything else was goin to have to be custom lines, and i agree that you should make new lines always, but if that is the case dont call them direct bolt on, i wish i would have known that someone was goin to need those turbos becuase i just sold the pair for 1500 never used

TSL
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ItzGenX wrote:R32 and R33 RB26 turbos are usually journal bearing T28's with ceramic turbine wheels (almost exactly like S14 SR20 turbos except for ceramic wheel).
Nope. Not even close.They are T25, similar in compressor cover size to an S13 SR20 turbo but with the same size wheels as a CA18 turbo and with smaller exhaust housings.

An S14 sr20 t28 turbo is much larger in every way.

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wagzilla260rs
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BHFR-GTR wrote:yes then they were the -5's then cause they were the 360 not the 310, the outlets and dumps would work i had them bolted on, but of course they had to be modified to fit past the steering shaft. and all my lines were stock the oil returns and water feeds, none of the sizes were correct. the water feed is bigger on the turbos and the dumps were way to long if u used the stock ones, and they wouldnt bolt on. the water return lines are on there in that picture but thats it, everything else was goin to have to be custom lines, and i agree that you should make new lines always, but if that is the case dont call them direct bolt on, i wish i would have known that someone was goin to need those turbos becuase i just sold the pair for 1500 never used
that is the storie of my life "oh man I just sold them"

BHFR-GTR
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damn man sorry, i had posted them up, but i think it was before i joined this forum

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wagzilla260rs
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hit me up if you have anything else cool

BHFR-GTR
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well i have a set of rb26 stock cams, and a stock 26 ecu, and a set of coated stock exhaust manifolds i thnk that is all the 26 stuff i got


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