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I Put My Rb 25 Turbo On To My Engine Now What?

335

By 335,
in Engines & Forced Induction

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335 Rising Star

335

Posted
Posted

Hello

I put my RB25 turbo onto my R32 GTS-T RB20 and I notice a improvement. The car seems to take off better and seems to go abit faster and less lag.

I still have the original intercooler on there.

How much is the stock intercooler restricting any new gains I will get from the turbo change?

I have a R34 intercooler I am going to put in as soon as I can get it modded to fit.

With a catback exhaust, intake, and the RB25 turbo, how much hp over the original hp will I probably be getting?

Also is there anything else I need to do to make this mod better? Will upgrading to a 555cc fuel pump help at all?

Help

def_jamz112 Collaborator

def_jamz112

Posted
Posted

hey mate once you have the intercooler sorted, i would say your next step should be finishing off the exaust.

fit any 3" front/dump pipe and a high flow cat, as the stock ones are very restrictive.. you should feel the difference right away

TTT Grand Master

TTT

Posted
Posted

agreed.

once that is done, get your self a $30 turbo tech boost controller, a walbro fuel pump, then talk to "TOSHI" or "CEF11E" from these forums regarding remaps

will cost you from about $100 - $200 for the remap.

12-14 psi (depends on what you want to run and what you feel is safe) should net you somewhere between 170-190rwkw depending on Dyno.

335 Rising Star

335

Posted
  • Author
Posted
agreed.

once that is done, get your self a $30 turbo tech boost controller, a walbro fuel pump, then talk to "TOSHI" or "CEF11E" from these forums regarding remaps

will cost you from about $100 - $200 for the remap.

12-14 psi (depends on what you want to run and what you feel is safe) should net you somewhere between 170-190rwkw depending on Dyno.

So in order to see any gains, I have to get a remap or tune? I have a HKS adjustable acuator on the turbo(came with it) I don't know what its set at. Does anyone know how to adjust these?

Douse Collaborator

Douse

Posted
Posted
It should have more lag now. I've had first hand experience with this. It's likely you feeling the difference because you want too feel it.

The amount of extra lag depends on the type of RB25 turbo you use.

The R34 ones should have a nylon compressor wheel so they have less lag then the steel S1 R33 turbos.

QWK32 Veteran

QWK32

Posted
Posted
The amount of extra lag depends on the type of RB25 turbo you use.

The R34 ones should have a nylon compressor wheel so they have less lag then the steel S1 R33 turbos.

not true. R33 series 2 turbos have the nylon compressor wheel also. the R34 turbos actually have more lag due to a slightly bigger exhaust wheel and housing than the R33 one. i've run a series 1 (steel comp wheel) and a series 2(nylon comp wheel) on my 32 when i had it and didn't notice any difference between the two.

DECIM8 Grand Master

DECIM8

Posted
Posted

Yeap Josh above me got it right .. r34 has a bigger exhaust housing vq30? will go like crap on a rb20

R33 turbos will bring boost on latter to as you have less exhaust gas in a 2L

a tune will be needed to bring more power...

QWK32 Veteran

QWK32

Posted
Posted

i was actually still hitting full boost (13psi) around 3000 - 3500rpm. so not that laggy, very drive able. i found that it still came on boost around the same time but just kept pulling through the rev range instead of flattening out like the stock 32 turbo does.

and Mike, like everyone has said. get a full exhuast setup, put the R34 SMIC on or just get a FMIC kit and put the on, get the ecu chipped or even just a fuel computer like the SAFC in and tuned. set the boost to 12-13psi. definately get a new fuel pump, as yours is 15 years old or older and will probably be on its way out soon (p.s. do the pump before the tune :thumbsup: ) stock injectors will be ok on this setup. and as GTST hs said, it should see you around the 180rwkw mark.

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