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Gt35 On Rb25?

Soundboyracer

By Soundboyracer,
in Engines & Forced Induction

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Ben C34 Grand Master

Ben C34

Posted
Posted (edited)

Can't see why not. Don't listen to people that say silly things like supporting mods etc. Just bolt it on and boost away into the sunset. ;) rb25s were made for turbos after all.

Edited by superben
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AngryRB Grand Master

AngryRB

Posted
Posted (edited)

After seeing the results of his VNT I think Hypergear would be a far better choice, I don't think any other manufacturer would spend so much time with an R33 on the dyno to develop turbo options for an Rb.

Edited by AngryRB
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LTHLRB Grand Master

LTHLRB

Posted
Posted

You can put any turbo on an rb25. Just depends on what you want to use the car for and how much power you want. Hypergear stuff isnt crap and props to them for making the choice easy for skyline owners when it comes to setups.

The reason why garrett and precision dont spend so much time developing a turbo for the 25 is most likely because they aren't aiming for skyline owners but moreso aiming for the entire performance/turbo world.

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Joshbigt62r Proficient

Joshbigt62r

Posted
Posted (edited)

Dont be confused a garrett gt3582r ("3540") is a good turbo but it will be on the laggy side of turbos for a rb25. You also cant just bolt one on and away you go. You'll need supporting mods like a " ecu, atleast 740cc injectors or bigger if going e85. 4" dump into a 3.5"

exhaust with a sutiable cat. Drop in cams and valve springs. Depending on fuel your planning to use will determine what fuel pump set up you need. Remember a (3540) is a 700hp turbo so unless used on a track on constant high revs it will feel laggy on the street. You'll need other things for a 3540 setup. Suspension, brakes, clutch etc. You would be bettet off spending the money on a HYPERGEAR hi-flow. Ss1pu would be good for a simple upgrade. Or his ss2 vnt if your prepared to upgrade other bits & pieces. Or a 3076 hta. Precision 5757/5858 billet cea wheel could be a goet as well.

Josh.

Edited by Joshbigt62r
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hypergear Grand Master

hypergear

Posted
Posted

I found this on the dynosheet section, It is a GT3582 in a .82 rear housing, This is a very good comparison to mine which has a more "Rb25det defined" 3582 equivalent turbocharger.

gallery_34685_3163_69889.jpg

Compare with boost plot:

boost.jpg

Which is identical to my controlled run (thick yellow), Thin yellow is the defined version.

Power wise it made 445rwkws @25psi @ 4500RPM. It is not that bad, still not a responsive turbo for a daily, which I'm working on.

Depending on how Cheap a GT3582 can be obtained, I can certainly modify it to the "defined" version at a fee. After the completion of research.

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Joshbigt62r Proficient

Joshbigt62r

Posted
Posted

Save your money up and buy a power fc if funds ade tight or what I recommend go straight to a adaptronic/Vi-Pec/ Link or Haltech direct plug in mate. Then you wonf need a afm. Jyst use thd map sensor and tons more features mate. Greddy blue is good for a paper weighf thats a8 it lol. And aem im not sure many people tune them here in Australia. Pick whatever ECU your tuner is most comfortable with I should have said.

Josh.

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Lithium Grand Master

Lithium

Posted
Posted

I love this magical "RB25 specific" stuff. Turbo has NFI what engine it is attached to, sure - there are some combinations which will suit each other better or otherwise but for the most part that is bigger picture turbo/engine/part matching stuff (ie, tuning in the bigger picture). Comparing two large turbos on an engine not good at spooling turbos and allowing one to start at 1500rpm and giving that turbo 4.6 seconds to reach 4500rpm (Hypergear - assuming the 9 second run Chequered uses still applies) versus one which starts at 2500rpm and allows it 3.1 seconds to get to 4500rpm (GT35R) proves that the Hypergear turbo can build more boost by 4500rpm if it's given 50% more time to do so. Out of interest, the GT35R is actually hitting full boost 3.7s into it's dyno run after starting 1000rpm later, versus 4.6 for the Hypergear. How they'd both compare on the same start rpm and ramp rate, who knows.

A question which hasn't been asked so far - is that an actual Garrett GT3582R, or an ebay-type "GT35"? I'm starting to wonder.... and if that's the case, save your money and keep the stock turbo.

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hypergear Grand Master

hypergear

Posted
Posted

I love this magical "RB25 specific" stuff. Turbo has NFI what engine it is attached to, sure - there are some combinations which will suit each other better or otherwise but for the most part that is bigger picture turbo/engine/part matching stuff (ie, tuning in the bigger picture). Comparing two large turbos on an engine not good at spooling turbos and allowing one to start at 1500rpm and giving that turbo 4.6 seconds to reach 4500rpm (Hypergear - assuming the 9 second run Chequered uses still applies) versus one which starts at 2500rpm and allows it 3.1 seconds to get to 4500rpm (GT35R) proves that the Hypergear turbo can build more boost by 4500rpm if it's given 50% more time to do so. Out of interest, the GT35R is actually hitting full boost 3.7s into it's dyno run after starting 1000rpm later, versus 4.6 for the Hypergear. How they'd both compare on the same start rpm and ramp rate, who knows.

Its not "magic", it is ingenuity, more because enough work and researches has been put into this item, specifically for a Rb25det. Results came from the dynosheet section that has same setup as mine

The dyno automatically pickup data in set roller rate and completes in a given time. So at the point of where data began to plotted car is already on fully throttle, in which makes no difference to boost generating behavior. You can start plotting from 500RPMs and it will still match identical RPM/Boost plots.

Plus turbocharger in this size is not sensitive to ramp change, lets give / take 1.3 sec makes 0 differences.

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R31Nismoid Grand Master

R31Nismoid

Posted
Posted

GT35 - 400rwkw turbo.

You're going to need more than 550cc injectors unless you plan to run a pretty high base pressure to start off with which would then lead to ensuring you have a very good fuel pump to supply the fuel @ that rate/pressure.

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