Garrett Gt3071r Too Big For Rb20det?

[Vomit]

Hey guys.

Just wondering if a Garrett GT3071R with .86 exhaust housing will be right for my application?

I have a stock RB20DET in a silvia and was wondering if this turbo would be too big?

Im wanting to run a flat 13/high 12 1/4 mile. put out somewhere around 300rwhp.

Any help much apprechiated.

ALSO, It already has the T25 flange, so it will bolt up to standed rb20 and rb25 manifolds? What else will i need?

Will i NEED any supporting mods just to run this turbo?

[W0rp3D]

Hey guys.

Just wondering if a Garrett GT3071R with .86 exhaust housing will be right for my application?

I have a stock RB20DET in a silvia and was wondering if this turbo would be too big?

Im wanting to run a flat 13/high 12 1/4 mile. put out somewhere around 300rwhp.

Any help much apprechiated.

ALSO, It already has the T25 flange, so it will bolt up to standed rb20 and rb25 manifolds? What else will i need?

Will i NEED any supporting mods just to run this turbo?

I know that rb25's have a T3 flange, pretty sure rb20's do as well.

Also for 300hp (225rwkw) i think a high flow rb25 turbo would do that for less money and no need for custom dump pipes and intakes that you would need for a 3071R, i do think that the .8 may be a little big for a 20 tho.

[conan7772]

Hey guys.

Just wondering if a Garrett GT3071R with .86 exhaust housing will be right for my application?

I have a stock RB20DET in a silvia and was wondering if this turbo would be too big?

Im wanting to run a flat 13/high 12 1/4 mile. put out somewhere around 300rwhp.

Any help much apprechiated.

ALSO, It already has the T25 flange, so it will bolt up to standed rb20 and rb25 manifolds? What else will i need?

Will i NEED any supporting mods just to run this turbo?

Nice choice, however

a high flow T28 (RB25 VG30)might achieve that number heaps quicker !

[Vomit]

Argh! T25 are not the same as t3, t25 are same as t2.....

Any sugestions if i wanted to upgrade turbo? i know alot of people use the HKS 2530 or 2535, anything else that might meet my needs? Or if i want to get 300 ponys out of the RB25 turbo what should i be spending the $$ on?

[R31Nismoid]

If you only want to run a 12 sec pass - yes, too big.

[W0rp3D]

I would suggest a high flow, cheap and pretty much a straight bolt on, other things you will need for 300hp is injectors, fuel pump, afm, management and if you dont already have them 3" exhaust and a fmic.

Edited September 23, 2009 by W0rp3D

[Vomit]

Nice choice, however

a high flow T28 (RB25 VG30)might achieve that number heaps quicker !

Im just not happy with how my current turbo feels coming onto boost, recently nsold my RB25DET VL with a Garrett GT3540 which when boost came on would pin me to my seat. I mean it was laggy as hell but loved the feeling, any good turbos to give me something between the two?

[Vomit]

Yep, "ONLY" 12's

Any sugestions as for what kind of turbo i should be looking at?

THanks heaps for all the fast replys.

[conan7772]

Argh! T25 are not the same as t3, t25 are same as t2.....

Any sugestions if i wanted to upgrade turbo? i know alot of people use the HKS 2530 or 2535, anything else that might meet my needs? Or if i want to get 300 ponys out of the RB25 turbo what should i be spending the $$ on?

I had 360 rwhp with my high flow on a Rb25/30.

Full boost at 2400 rpm.

Just like having a V8 under the hood.

GCG flog em for $1850.

Looks like you're stuck with a T25.

Don't forget you can custom choose what wheels and cartridge you want.

[Roy]

High flows are typically 420-450hp. I ran a 12.9 with only 220rwkws. So i would suggest a 2530 or 2535, buy a second hand unit, they are very durable provided they do not have damaged wheels. Look around for a 350hp turbo and you will be right

[bradsm87]

A proper T3 GT3071R with a .63 turbine housing would be much better suited to an RB20.

[Dose Pipe Sutututu]

A proper T3 GT3071R with a .63 turbine housing would be much better suited to an RB20.

I still think it's big, I had a 2871R and found it stupidly laggy on my RB20,

Running a RB25 turbo @ 1bar would yield 200rwKws on a RB20 with a good tune, i.e. good timing & mixture

[joeyjoejoejuniorshabadoo]

rb20 i'd look for an hks GTRS

[discopotato03]

If you want to stay with the std RB20DET exhaust manifold it means using a turbocharger with a "T3" flange . From HKS it could be something like a GT2530 or GT2535 or GTRS which is a 52 compressor trim GT2871R . Just make sure you ask for the RB spec ones because they were also made with T2/25/28 (same) sized mounting flange on their turbine housings for CA18/SR20/RB26 . The RB20/25 specific GTRS also has a port shrouded compressor housing and the 2530 Kai may have it as well . Very important on a small capacity six .

Most people find generic GT2871R's laggy because they usually get or opt for the largest (56T) compressor and IMO it's a bit much for the GT28 turbine to drive . Garrett make the GT2871R in 48/52/56 compressor trims .

The GCG Hi Flow could probably get you there though be aware that the RB25DET's turbine housing looks virtually the same as the RB20's one but it is a little bit larger in its internal passage so starting with an RB25's turbo would be a better bet than an R32 RB20's one . I think the VG30 BB turbos turbine housing would be too big and laggy on an RB20 .

GCG and some other mobs used to sell an aftermarket turbine housing with a T3 mounting flange and was set up to accept a Garrett ball bearing GT cartridge , the buyer option which one and it was profile machined to suit it's turbine . It also had the std RB20/25 dump flange pattern .

It would be possible to fit the cartridge from a GT2860RS or GT2871R into one or possibly use an original RB25 one .

It comes down to your priorities of how much to spend and how easy to fit up .

A real GT3071R is going to be a bit bulky for a 300 Hp turbo and has the biggest chance of being laggy because it's GT30 turbine is designed for a fair bit higher power output - 300 Kw + .

Maybe for starters you could try a std RB25 turbocharger with the RB20's wastegate actuator , just remember it still has the ceramic turbine and in some cases the composite compressor wheel so don't be greedy with boost or they die a quick death .

It won't give you 225 Kw but it should be easy and reasonably cheap , they make ~ 185Kw on an R33 RB25DET .

Options , cheers A .

[phat_man]

anyone have any experience with the GT-RS and the GT2535 on a RB20?

i would like to know what kind of power there capable of on the 2litre and when to expect full boost.

thinking of going down the gt2530 as i like the boost curve and its a decent amount of power, but would like over 240rwkw if im going to spend that much.

how would these compare, in terms of power and response. anyone have dyno sheets i can have a look at?

thanks.

[JonnoHR31]

from memory the hks 2535s can JUST push 300rwhp on a fairly standard 20 at around 18-20psi

[Roy]

anyone have any experience with the GT-RS and the GT2535 on a RB20?

i would like to know what kind of power there capable of on the 2litre and when to expect full boost.

thinking of going down the gt2530 as i like the boost curve and its a decent amount of power, but would like over 240rwkw if im going to spend that much.

how would these compare, in terms of power and response. anyone have dyno sheets i can have a look at?

thanks.

GT-RS is lagger on an RB20 then a TD06-20G setup. I say setup as it included manifold, gate and turbo. So not a fair comparison when up against a bolt on GT-RS...but that gives you an idea. A little less power and a bit more lag from the GT-RS, but bolt on convenience

[discopotato03]

A while back someone here , Lithium ? , made up a Hi Flow using a Garrett GT2871R (48 comp trim) cartridge in re profiled I think RB25 turbos housings . I think his was in an R33 GTS25T and from memory he said it was very smooth power wise with a bit more everywhere .

Something like this should be more than capable of making 300 hp on an RB20DET and it uses housings intended for an RB engine .

Ask him , cheers A .

[phat_man]

GT-RS is lagger on an RB20 then a TD06-20G setup. I say setup as it included manifold, gate and turbo. So not a fair comparison when up against a bolt on GT-RS...but that gives you an idea. A little less power and a bit more lag from the GT-RS, but bolt on convenience

thanks for that mate.

hows the GT2535 go? is it much laggier then the GT2530? is it worth the lag for the better high end.

[Vomit]

Thanks alot everyone for all the responses. Have done abit more research and thanks to the help from you guys i have alot more to base my descion on and i am thinking towards the HKS 2535.

Just wondering... Is there a rule of thumb for injector sizes?