Rb25 Mild Turbo Upgrade

[RBceffy25]

Heya im new here so plz be kind!

I own a 1990 A31 Cefiro RB25DET. Its pretty much a stock engine with current mods including:

Internally stock

Blitz pod filter

HKS 3" turbo back exhaust

Walbro 255l/h fuel pump

I also have a HDi FMIC kit on the way that will be fitted within the next week or so.

Other mods will include Splitfire coils, D1 Spec VSD IV Ignition booster system and a good tune once its all fitted.

I'm not looking for big power gains as my cefiro is a daily driver so i wanna keep response and drivability in mind.

I just want to know if the Garrett GT2860R (http://www.turbobygarrett.com/turbobygarre...0R_707160_5.htm) is any good for an upgrade on my RB25DET ceffy?

Any info, opinions or specs would be much appreciated!

[Mr500]

wrong flange me thinks, mate. you need T3.

[HEKT1K]

gday mate, welcome to the forums.

everyone is going to tell you to look at this thread:

http://www.skylinesaustralia.com/forums/Rb...yno-t55845.html

it has dyno results for rb25s with all kinds of turbos etc.

so decide your power goal and have a squiz at what other people are running.

good luck

Ric

[RBceffy25]

thanks Ric. some good specs on that thread.

I'm thinking with that set-up i should achieve 190-200rwkw on say 12psi

possibly more with an adjustable actuator thrown on.

[_Ryan_]

  Mr500 said:

wrong flange me thinks, mate. you need T3.

hpinabox do em in t3

[Chi100188]

if u can get ur hands on a HKS 2535 or even a HKS GTRS they are a good upgrade i highly recommend them other then that i'd just got a GT30

[Equinox]

The GT2860RS will not have enough flow for an RB25 running 12psi. It will be at it's absolute limit and although it will be able to run 12psi through the midrange it will taper off to 9psi or so at limiter. And yes you will need to get a T3 housing machined to fit.

I'd go for something like a GT3071R or an HKS GT-RS which will bolt on to your stock manifold and will be a good match for the engine running 18psi.

For the record, at 12psi an RB25 with a stock redline will be needing approximately 38lb/min or 545cfm of air and at 18psi it will be needing 47lb/min or 670cfm. Use these values to select an appropriate turbo off the Garrett website.

Edited March 31, 2009 by Equinox

[R31Nismoid]

It would be a good turbo for a super responsive 200-220rwkw...

A 2530's is basically treated as a swap-out style turbo for the stocker... makes a tad more power, without the risk of a wheel shitting itself and more boost, making it all nice and snappy

If only it came with the right flange though, it's not worth machining housings to suit

[RBceffy25]

cool, im starting to get the picture...

With the turbos mentioned so far would i have to upgrade injectors?

cause i dont really wanna go that far at this stage...

[joeyjoejoejuniorshabadoo]

depends on what you wanna spend.... if you are happy to limit yourself to say 230rwkw you can just get a highflow from gcg and keep stock injectors and afm. you will want a computer to run the show however a piggyback will manage... just

if i had my time again with an rb25 i'd probably go this route and see how much i could squeeze out of a highflow, stock injectors and e85...

although i am very happy with the current setup.... just not how much it all cost...

the next project i'm undertaking is an SR20det ke70 with stock everything barring computer and my old 33 turbo... on e85 so i spose that'll be close enough

if you are willing to pay the $$$ for injectors/afm/ecu/clutch/fuelpump/ then a gtrs/2835pros/3071/3076 setup will see you to the high 200's

[RBceffy25]

200-230 rwkw is all i wanna achieve.

I heard that can you get a T2-T3 adaptor for applications such as a GT28.

Good option or not????

[PWND]

200 - 230rwkw?

just get yourself a high flow.

bolt straight up to your standard manifold, and usually have great response

cost effective option

[HEKT1K]

and they look identical to the stocker

[PWND]

  HEKT1K said:

and they look identical to the stocker

what he said

minimizes attention from the fuzz

[RBceffy25]

  PWND said:

200 - 230rwkw?

just get yourself a high flow.

bolt straight up to your standard manifold, and usually have great response

cost effective option

Ok. What exactly do they mod when you get a high flow done? And,

how much $$ for a high flow usually?

cause i can get a GT2860R for under $900...

[RBceffy25]

  RBceffy25 said:

Ok. What exactly do they mod when you get a high flow done? And,

how much $$ for a high flow usually?

cause i can get a GT2860R for under $900...

...a brand new GT2860R that is.

[RBceffy25]

So my options are

A high flow stock turbo

or

A GT2860R with adapter plate

What about a VG30DET turbo???

I've heard good things...

[Pal]

200 rwkw isnt enough for a rb25. get used to it very quickly. 230 to 240 is a nice usable power level

[SDEWY5]

get a 4088 DO IT! then u will have to make it work somehow, by the time u get it working rite itll b a god dam monster...there is logic in my thinking...not much but some..

[RBceffy25]

Can any one tell me if the VG30 turbo is any good for a high flow?

I heard there a direct bolt up...?

The one im loking at has the op6 rear housing.

Any specs on this tubro would also help i.e BB, ceramic or steel wheel?????