Gt2871R Advice!

[kevlo948]

I am currently tossing up between 2 versions of the GT2871r for an rb25.

I'm looking for a responsive 250-270kw with decent top end.

The first is the GT2871r 0.64 52 trim (AKA GT-RS).

The second is the GT2871r 0.86 56 trim.

I will be replacing the rear housing with either an OP6 or standard r33 rear housing so it bolts into the stock location.

Intake piping will be modified to suit.

My question is this, which version of the 2871r would be more appropriate and is the OP6 housing worth it?

[The Dan]

Quick answer is no

I may be wrong but a 2871 is going to only just squeeze out 250rwkw, then you're going to choke it with an OP6 housing?

Why not just get a GT3071R with the Sonic housing - Happy days

[hypergear]

It chocks the engine. those turbos are good for 4 cyc engines. High flow of OP6 produces better result.

[Birds]

Responsive 250-270rwkw AND a decent top end? Haven't you just named your top end in the former? Get a high flow OP6 or fit a standard 3071.

[slippylotion]

I know its on my SR but I had the 56 trim with .64 exh and made 268.5rwkw on 18psi on 98 pump. Full boost of 18psi @ 3800rpm. Good little turbo.

[51NNA]

GTX30/76 or one of Hypergear turbos

[The Dan]

It chocks the engine. those turbos are good for 4 cyc engines. High flow of OP6 produces better result.

The Sonic turbine housing will outflow the OP6 housing

[AngryRB]

why not just go a GT3076 with 0.63 rear?

Gt2871 belongs on a 2L silvia, waste of money on a r33

[kevlo948]

Daniel, are you able to pass me a link to the 3071r with sonic housing as I cant find it? (Also, how big is this housing)

The GT3071r internally gated was my other option and it seems as this will be the way to go.

Originally i was after the 0.64 rear housing but I have heard this smaller housing has trouble with boost control.

Because of this, I'll be looking into the standard 0.86 rear housing.

With regards to fitment, I am unsure about a few things regarding the 3071 and I cant find a clear answer.

All I need is for it to bolt onto the stock manifold and dump (oil/water lines will be sorted and custom intake piping will be made).

What is needed to make this possible (i.e. from manifold to turbo & from turbo to dump)

Thanks for the replies guys, I appreciate the help.

[The Dan]

http://www.sonicperformance.com.au/739548_dash_RB20_dash_25/Nissan-RB20_or_25-Ball-Bearing-Upgrade/pd.php

That's about all I can find on the Sonic website as far as what's got a housing but we have done quite a few upgrades now with really good results. Genuine Garrett turbo and the housing fitted is a 0.75 A/R. It can be fitted to anything from a T28 up to a GT3076R.

Then you can have the standard RB25 comp cover machined to suit the front so it's a direct bolt on arrangement but we always pick a size larger when we do this because the smaller comp cover does effect airflow a little bit.

All the standard piping, dump and manifold all fits back up to the original place.

One of those would get you 260rwkw and is complete bolt on except for the water line around the back of the head needs to be cut to suit the line kit you get

Then there is option B which is to leave the 3071 comp cover on it and do your pipework as planned. I think the last one we did was 275rwkw at 18psi but may have been 16psi I cannot remember right now

[GTScotT]

Sonic housing? R U serious?

I can recall quite a few threads where we have specifically weened people off the sonic housings, and even made them return it in place of a genuine Garrett at a massive cost.

Why is it you are recommending that product all of a sudden?

[The Dan]

Sonic housing? R U serious?

I can recall quite a few threads where we have specifically weened people off the sonic housings, and even made them return it in place of a genuine Garrett at a massive cost.

Why is it you are recommending that product all of a sudden?

Not sure why you would be weening people off them. They have a purpose and that's to make a Garrett turbo a direct bolt on. They will not flow as much as the housing that comes with the turbo unless its the 28 series. That's why a 3071 is suggested. It will provide very similar, if not the same, response and make the power he wants.

The only turbo that under-performed on a sonic housing for us was the large GT3076R. It only did 275rwkw at 16psi and more boost just made it ping.

We did a GT2860RS on an RB20 and it had identical response to the factory turbo and at 200rwkw on moderate boost, it also was a good performer.

I have fitted dozens without a single issue but anyone trying to get good power (280rwkw +) should be considering other options anyway. Too many people want to eat cake these days

[zebra]

I like cake

[kevlo948]

haha cheers Daniel that sounds great for what I am after.

I'll pop into MTQ to have a chat with them.

thanks again.

[GTScotT]

Not sure why you would be weening people off them. They have a purpose and that's to make a Garrett turbo a direct bolt on. They will not flow as much as the housing that comes with the turbo unless its the 28 series. That's why a 3071 is suggested. It will provide very similar, if not the same, response and make the power he wants.

The only turbo that under-performed on a sonic housing for us was the large GT3076R. It only did 275rwkw at 16psi and more boost just made it ping.

We did a GT2860RS on an RB20 and it had identical response to the factory turbo and at 200rwkw on moderate boost, it also was a good performer.

I have fitted dozens without a single issue but anyone trying to get good power (280rwkw +) should be considering other options anyway. Too many people want to eat cake these days

Fair enough. Its good that you put it out there re what they are good for.

Thanks,

[joeyjoejoejuniorshabadoo]

also you could look for an actual HKS GTRS (2nd hand)