Can A T2 Be Used To Get 400Bhp From An Rb25 ?

[rasored]

my tuner seems to think it is ok - but , it needs a boost controller to get 398.9bhp .

I have not got an ounce of trust in him anymore and would like to know what others think !

I tried to drive it the other day and it was useless ! he now says that the boost controller was MISS SET ?

after he had just set it up !! ?? - Gizzmo M2

why dose he want to use a T2 over a hybrid T3 - ?

dose this means that the T2 goint to run at its max ? and therefore will give no more extra power -

i have forged pistons so would use 2bar if needed - but dont think it will run on 2bar ?

could do with some advise as i think he is not explaining everything .

[XRATED]

Drugs???

[Badgaz]

i'd think thats not possible. t2? what sort of t2? anymore information? its hard enough making 400bhp with a highflowed t3.....

[Ben C34]

What?

[hypergear]

T2. in .86 can support that sort of power no issues. But why would you want to do that?

[Badgaz]

excuse my ignorance...but can you clarify what a t2 is? i was thinking its the one smaller than a t3?

[hypergear]

You mean flange size?

T3x has bigger flange size. It does not represent the A/R or the volume of the turbine housing.

[Richard Bell]

It is a Standard T3 RB25 turbo (same as the car had from factory) which has been machined and fitted with a garrett core and 360 deg bearing. Larger wheels and a enlarged wategate port and upreated actuator. Have used the same turbo on many RB25`s with no issues as I`m sure many other people have on here.

The boost controller was not miss set just off and on actuator pressure which is only .8 which is why it did not feel like what you were expecting. I`m sure if you had wanted to have another go with it set at 1.3 you would have been happy.

[Ben C34]

What?

Richard bell, are you the tuner?

Don't you know it's always the tuners fault? Rather than actually talking to the tuner about an issue, guys ask random questions, typically not giving much info and feed pointless speculation.

Bigger wheels in a housing is hardly specific, but I suppose some/most guys have no clue what they want or have it must be frustrating deal8ng with them.

[GTScotT]

Need more specific information about turbo to be able to give advice, however I will sum up the correct answer to this question ASSUMING you know what T2 and T3 means. I will also explain what they mean.

IN A CONDENSED DOWN NUTSHELL: T2 and T3 are flange sizes. In older times we would refer to T3 as a type of turbo, as Garrett would make turbos with this model number also. Today it simply refers to the flange.

So if you are talking about the flange the answer is yes, you can get 400hp from a T2 flanged turbo.

Example: HKS make 3037 kits in both T2 and T3, neither would necessarily be more restrictive than the other, they will probably work exactly the same. However if we were talking about something at the GT40 (700HPesque) level you would probably (I use this term loosely) start to find a bottleneck.

HOWEVER, if you think you have a T2 "turbo" and your mechanic is telling you to upgrade to a "T3", as if these are some kind of model numbers that describe what type of turbo you have... You are both off your heads and require emergency medical assistance. Dial 000.

Edited February 27, 2014 by GTScotT

[Shoujiki]

^Great post GTScotT.

[discopotato03]

Yes it can be done but the housing hanging off the flange needs to be something better than a small series T2 IW production one .

Most of HKSs GT30 turbine housings are "T2" flanged and went from 0.61 to I think 1.17 AR . The "Big" housing on a GT3240R was that 0.17 one for from memory for 540 Hp .

These all need external gates because no one used big IW housings in those days .

T3 flanged turbine housings are a better bet .

A .

[Badgaz]

HOWEVER, if you think you have a T2 "turbo" and your mechanic is telling you to upgrade to a "T3", as if these are some kind of model numbers that describe what type of turbo you have... You are both off your heads and require emergency medical assistance. Dial 000.

Thats where my confusion lay...i thought it must've been a turbo i hadn't heard about...i'm so glad there are such good knowledgable trolls on this forum.

[rasored]

by T2 i mean a stock RB26DET SINGLE turbo with Mods to run a forged RB25det

555 injectors

stock cams

z32 Maf

bigger exhaust and fmic

idea is to get 400bhp - but not by means of a boost controller .

IT WAS !!! was running a T3 hybrid - that - i was told it had boost drop off issues ! and could only run at 240bhp . I !!! suggested that the rear turbine needed changing along with the housing . BUT he said he would put a turbo on that he said would run 400 all day and that he had done this many times .

end result is a car that dose not pull any faster than it did running stock ECU !!! IN FACT THE CAR IS SLOWER !! WITH 398.9BHP ???

i DID NOT MENTION THE TUNER !!! as i am not throwing sh1t at anyone without the right info !!

AND I dont need a customer who DOSE NOT have an auto S1 Stagea saying he is great and his car runs fine ! that is no comparison .

[GTSBoy]

Still doesn't make any sense. Would you like to have another go at telling this story?

[rasored]

wagon was delivered to tuner running with :-

stock cams - stock MAF - stock injectors - hybrid china RB25DET T3 unit with stock 6 bolt elbow fixing with stock internal waste gate / internals are HKS cartridge running stock size rear turbine wheel and has an 80mm cold side air intake but with what i think is stock size compression wheel .

It ran well but suffered fuel cut as boost was set to 1.1bar - it had a noticeable flat spot at high 4,000 but then came back with even more of a kick . It ran with a mates manual S1 stock stagea and they were identical in acceleration !

I asked for the 555 injectors - z32 MAF to be fitted that i had supplied . The original idea was for an investigation as to whether the S1 stock ECU could be tuned ! but i was told no chance ( no new news there ) , so I had also supplied a piggy back unit which i was told was dud - so i brought a Stagea S2 ECU and he installed a nistune board ( type 4 is only fit ! ) .

Various boost leaks were found and cured , inc. a dud Gizzmo boost controller - It was reported back that my turbo was dropping boost at higher revs , so a new turbo was needed .

I suggested that a larger rear turbine wheel and smaller housing was what others were doing with good results and left it with him .

Unbeknownst to me he fitted a single T2 RB26DETT turbo and stated 398.9bhp was achieved .

Happy with that i drove down again and collected , after pulling out of the 1st turning i knew all was not good - warmed it up after putting in some fuel i attempted to try it again - as i thought ! i had less power slower gear changes and a kick down that was in the post ( so slow ! ) this would not explain the 200bhp loss from a print out piece of paper to the tyres on the road . My mate was following me in his MISFIRING ford focus and was keeping up with me every step of the way !!! He could not believe i was using full throttle as he did not !!

The T2 Single RB26DETT turbo has less power and yet a stated 398.9bhp - when i delivered it was around 240bhp with T3 RB25DET AND FASTER INC GEAR CHANGES

[Shoujiki]

Why do you keep stating T2, T3 T blah blah when it's already been pointed out above that it's simply the mounting design and nothing to do with the issue at hand. Confusing as.

From what i can draw out of the long winded story:

1- Deliver car to tuner with 240HP running an "hybrid china" turbo to suit RB25DET (it's to suit RB25 because it has a T3 flange?).

2- Get some work done, tuner installs a turbo from an RB26DETT (stock turbo and has a T2 flange) (why install this?) and makes 398HP.

3- Driving home car is slower and has poor auto gear response, even though the dyno printout reads it has 160 odd more HP.

That is confusing!

[rasored]

Why do you keep stating T2, T3 T blah blah when it's already been pointed out above that it's simply the mounting design and nothing to do with the issue at hand. Confusing as.

From what i can draw out of the long winded story:

1- Deliver car to tuner with 240HP running an "hybrid china" turbo to suit RB25DET (it's to suit RB25 because it has a T3 flange?).

2- Get some work done, tuner installs a turbo from an RB26DETT (stock turbo and has a T2 flange) (why install this?) and makes 398HP.

3- Driving home car is slower and has poor auto gear response, even though the dyno printout reads it has 160 odd more HP.

That is confusing!

so what are you saying ?

[rasored]

i thought i may get some help and ideas about my situation .

I have not mentioned or mouthed off about the tuner at any point !!

i just asked "BADLY ACCORDING TO OTHERS" will a single RB26 turbo( modded) - ! give usable 400bhp on an rb25 running an auto box ?

I only used T2 and T3 as others in UK call them that , if you want to help and answer the simpler question then thanks .

But if you just want to gloat , put words in my mouth and try to make others look inept then go to another thread and hate there .

I was expecting more from SAU .

[jay-rod]

Dude you are not talking properly and you are not listening to good advice....

A "china" rb25 turbo i doubt would make any more power than a stock rb25 turbo ( mabye within 10%)

Which is proven by the fact you only got 240 atw.....stock cars get that...

With that said, if you buy the right China copy...yes you could easily get over 400hp...be it laggy as hell..

A single rb26 " hybrid" ? you mean a china copy?? Why do you keep saying hybrid?? what the hell does that even mean?

Or you mean a proplerly Highflowed rb26 turbo? then mabye....all depends on what was done to the turbo.

A stock rb26 turbo getting 400hp atw on a rb25? No chance...

Now the dropping boost at higher revs part..

That could be

A. Stock internal gate ( most likely the problem )

B. The "China" Turbo...you say it has HKS internals...i dont believe that...

Edited February 28, 2014 by jay-rod