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Real Garrett Gt3071r (-23 Chra) On Rb25det Results Wanted .

discopotato03

By discopotato03,
in Engines & Forced Induction

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discopotato03 Grand Master

discopotato03

Posted
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Hi all , many here have been wondering what sort of power characteristics Garretts GT3071R (CHRA 700177-5023) turbo gives on mechanically std RB25DET's . By standard I mean the factory exhaust manifold so that the GT30 IW turbine housings can bolt up . In another thread someone mentioned they're making 270 odd Kw at around a bar of boost with Garretts GT30 IW 0.82 A/R turbine housing . I'd very much like to know where they climb into boost engine speed wise and how it all feels with part throtle driving .

Thanks in advance , cheers Adrian .

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SmittyR33 Contributor

SmittyR33

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I made 230rwkw at 15psi with mine. Has internal wastegate and is on the standard exhaust manifold. The only thing I did to the manifold was port it out a bit and remove some casting marks and stuff. Other usual mods - Power FC, front mount cooler. Still on stock AFM and injectors.

I see full boost at 3300rpm and part throttle driving is good too. Pulls really good too even in 5th.

Pretty sure I have the .63 exhaust housing. Got if from GCG cos thats what they recommended.

Edited by SmittyR33
discopotato03 Grand Master

discopotato03

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Thanks , I'd really like to hear from people using Garretts GT30 IW turbine housings so we can all get an idea what to expect from using the 0.63 and 0.82 A/R housings .

Recently I thought I'd found a HKS GT3037 Pro S type turbine housing in 0.68 A/R but it turned out to be the 0.87 version , possibly a bit large for 2.5L and the 71mm GT compressor .

Cheers A .

Cubes Grand Master

Cubes

Posted
Posted
I made 230rwkw at 15psi with mine. Has internal wastegate and is on the standard exhaust manifold. The only thing I did to the manifold was port it out a bit and remove some casting marks and stuff. Other usual mods - Power FC, front mount cooler. Still on stock AFM and injectors.

I see full boost at 3300rpm and part throttle driving is good too. Pulls really good too even in 5th.

Pretty sure I have the .63 exhaust housing. Got if from GCG cos thats what they recommended.

That power doesn't really fall inline with the 'real' GT3071r. My bets are they supplied the cropped version.

OR.. Your dyno is simply very very conservative.

Sorry Disco to spam your thread but just to make it clear those figures the above has seen is not the norm from the real gt3071r.

discopotato03 Grand Master

discopotato03

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Posted (edited)

Yes thats what I thought as well . You could get somewhere near that figure at the bleeding edge on a 2530 I'd think .

A while back ATP was claiming that the real GT3071R pulled up 500-1000 revs sooner than a GT3076R though the feeling overseas is that it doesn't work like that . Most people using the 3071R in the US have them on 2L fours so the results are not the same as you'd get on a 2.5L RB 6 - particularly in a 1370 odd Kg R33 .

Most people for cost reasons don't want to change their exhaust manifolds and until a twin scroll twin integral gate turbine housing becomes available (no time soon) the IW GT30 housings is all we have ATM .

In the other thread someone mentioned 270 Kw at 1 bar and I was hoping they would tell me what A/R turbine housing (assuming its a GT30IW one) and confirm the -23 cartridge number . I would think if it is the real one and the propper housing type it must be a 0.63 A/R turbine housing .

Given Mafias results (300 Kw from a real GT3076R 0.63 A/R) obviously the hot side can pass the gas but the burning question is can the GT30 turb/0.63 housing combination spin the 71mm GT compressor fast enough to make it feel good on a fairly std RB25 powered R33 .

If we can make this work it will bridge the gap between GT28BB turbos and the GT3076R IW . If not then the only answers I know of are not going to be affordable for many people .

Cheers A .

Edited by discopotato03
The Mafia Grand Master

The Mafia

Posted
Posted (edited)
I made 230rwkw at 15psi with mine. Has internal wastegate and is on the standard exhaust manifold. The only thing I did to the manifold was port it out a bit and remove some casting marks and stuff. Other usual mods - Power FC, front mount cooler. Still on stock AFM and injectors.

I see full boost at 3300rpm and part throttle driving is good too. Pulls really good too even in 5th.

Pretty sure I have the .63 exhaust housing. Got if from GCG cos thats what they recommended.

That power doesn't really fall inline with the 'real' GT3071r. My bets are they supplied the cropped version.

hey guys

I have seen the turbo with my own eyes - Its a ground out RB25 rear housing fitted to the 3071.

If you remember a while back, I had a T04S 3076 with a ground out RB25 housing and water meth, and with 18psi I managed to squeeze out about 245rwkw.

It needs a real garrett housing strapped on.

Edited by The Mafia
skylinecouple Experienced

skylinecouple

Posted
Posted

Final cost delivered was $1800. Thats with the 14lb actuator and bracket and exhaust flange. After I paid I found a company equally as big that was $150 cheaper. Anyhow, there's a holdup on delivery to make sure it is the right 3071. Will speak to them tomorrow.

  • 2 weeks later...
skylinecouple Experienced

skylinecouple

Posted
Posted

Unfortunately I have to wait till I can get the time to do it as I work seven days a week. On the up side I have another car to drive around in January so may be ok then. Sorry guys. Parts are coming together slowly. Atp in the states are a big help, but don't talk to the receptionist, NOT helpful at all.

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