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Turbo Upgrade for a rb25det

Bo0sT_JuNkY

By Bo0sT_JuNkY,
in Engines & Forced Induction

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Steve Grand Master

Steve

Posted
Posted

R33 turbos are built by hitachi I think, they have a t3 flange with internals about the size of a t28 but are neither t28 or t3. I have also heard that the compressor wheels on R34 turbos are acutally nylon! This info is from letter written by HPI in response to similar questions ask as you have, and the response was posted on this forum somewhere, or it might have been SDU?

macka Veteran

macka

Posted
Posted

I dont recomend running more than 1bar on standard RB25DET due to its high compression ratio!

Hiflowing your standard turbo can be reliable and PROVEN horsepower gainer without any other turbo mods...Providing you find someone that can Build u a good quality hiflo unit just dont ask me........:eek:

TTT Grand Master

TTT

Posted
Posted
Im sure that the rear wheel is ceramic,Just the front wheel is titanium.Also ive heard some ppl say that r33 turbo's are t28 and other ppl say there t3 ,then ive heard t3 with t28 internals! Can anybody clean the issue up?

The RB25DET from the R33 and the RB20DET from the R32 GTST have a Bolt pattern which is the same as a Garrett T3. Therefore it is known by the public as a T3.

However, the internals are about the same size as that found in a Garrett T28.

So the turbo on your R33 can be replaced with another turbo which has a T3 bolt pattern (flange)

There are 100's of different spec turbos that could be called a T3 but the internals are going to be different from one another so you have to be specific on compressor trim and A/R numbers and so on to identify them properly.

The turbo's on the R34GTT are once again T3 bolt pattern.

The inlet (compressor)blades are made out of a NYLON material of some sort but the exhaust wheel is still ceramic like all the ones before it.

To be able to run like 1 - 1.5 Bar of boost on any standard skyline engine is going to cause issues.. it would definitly have to be a turbo with steel wheels and I don't think that this is going to be CHEAP as you want it to be.

The R33 turbo rebuild is a good idea.. probably still cost over $1000 though.

Mark0 Proficient

Mark0

Posted
Posted

yer i dunno what to put on though

a gt series id say ... but i got to research it more i would like to keep the t3 bolt on pattern so i dont need a new manifold.

there was one that chip torque mentioned to me yesterday but i cant remember what model it bolted straight on and dont need external wastegate

meggala Grand Master

meggala

Posted
Posted

you cana also get a t3 mark the hiflowed stock turbo's from gcg in sydney should do the job you want they come in either ballbearing or non ballbearing the latter being cheaper and are rated at 450 @ the flywheel. you have the set up to cope with this I would go for either the stage one or stage 2 it bolts straight up with no fiddling which can cause issues with some of the other off the shelf new turbo's and it still retains the internal waste gate. a hiflow t3/4 is also an option and can be gotten band new. you would want some thing with a 55 mm compressor wheel andsimilar sized exhaust wheel you could go up to 60mm as well but it would be a bit laggier.

meggala

glad to see your finally getting to this stage. cause you ahve done all the preliminary work

macka Veteran

macka

Posted
Posted
Originally posted by Mark0

hrmm got to weigh up if it is wrth spending that much on high flow or just get a new turbo for 2500

What turbo for 2500?

A new OEM Nissan ? then u get no power increase..

GT type BB turbo? then you will need new oil and water lines new Dump pipe and Adapter/spacer for the Giant compressor cover so it doesnt hit the Manifold.

I wanted to go a GT25/30 but it worked out to be $5000 including an Upper steampipe manifold which i thought was a bit much ;)

Bo0sT_JuNkY Community Regular

Bo0sT_JuNkY

Posted
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Posted

well i think i might keep use my cash to put in a 5sp.I Didnt think it would have been that exspensive for a upgrade.Aleast with a manual i can have some fun drifting!!!Its a **** drifting in auto and puts heaps of stress on the box.Someday ill have a T66 sitting under my bonnet ,but not for a while ;)

Joe Community Regular

Joe

Posted
Posted

HKS GT2530 or HKS GT2540 would be a nice conversion (depending on how much power you want to make)

You can either get a T3 or a T2 flange on them T3 is what you want tho, & it will bolt into the manifold easily, im not sure about clearning everything but i cant see that being a big hassle since its not that big of a turbo.

I wanted to go a GT25/30 but it worked out to be $5000 including an Upper steampipe manifold which i thought was a bit much

Why would it be $5000?

I have heard people fitting a 2530 stirhgt into there factory manifold with no problems at all but the oil lines which dont cost more then $100-200 if that! & the turbo are an internal gate turbos.

macka Veteran

macka

Posted
Posted

Ohh..

Sorry that was the price for GT30 with Ext gate your right......

The GT25/30 im referring to is the garrett unit with gt30 comp wheel but with the .70 comp cover it hits the exhaust manifold apparantly.

In that case u will need Turbo, new manifold, New Dump pipe, new oil and water lines new inlet and outlet piping on Compressor..

So i just opted to keep the Standard exhaust housing with a t4 front end so all i had to change was the wastegate brackets and both inlet and outlet of the t4 compressor, havent started it yet hopefully finished tonight :cool:

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