Gt2876r V.s. Gt3071r

[SILVIA_KIDs14.5]

ok i searched came up with this. GT2876R good to about 480hp and GT3071R good to about 460hp. Is this correct or am i seeing things lol. Could you guys give me some insighte could use the help in deciding which to get. Oh btw i have a stock set up right now, but have cams and other parts to but in with this looking to get close to 500hp with out doing a t3 set up. i know if i want to reach the 500 club i need t3 or better. just looking to do a little up grade right now.
thanks in advance

[EDacIouSX]

i THINK 28 is 380 and 30 is 460....... also depends on AR IIRC though i am no engine head so someone i am sure will correct me...

[KA-T_240]

You are going to have a really tough time getting 500whp out of either of those. If you want 500wph you would be better with a gt3076R which is still going to be not the easiest.

GT35R, T-61 and some others are better if you really want 500whp.

[fliprayzin240sx]

No buts or ifs around it, you 500hp, TOP MOUNT. T2 flange is just way too restrictive.

[GSXRJJordan]

The GT2876 has the bigger exhaust side, with the smaller compressor (whoops) side... this is more for large displacement engines. You don't want this.

The GT3071, with either A/R turbine side, can get you in the 500 hp range, to the crank. For 500whp, you'll need to go larger. The GT3076 may be enough, but who knows.

People that know what they're doing generally don't build a motor with a "horsepower goal". Sure, they have a target in mind, but you pick your turbo for the compromise between drivability and peak hp. Remember, you're trying to maximize the area under the curve, on the dyno sheet (unless you're just going for a 'dyno queen').

Steve Shadows has been toyin with the 500hp mark with his GT3071/stock block SR20 setup, while retaining GREAT drivability/trackability - contact him if you're serious.

[smelly240]

The GT2876 has the bigger exhaust side, with the smaller turbine side... this is more for large displacement engines. You don't want this.



the turbine is the exhaust side :P i know what u are trying to say tho (btw 3071>>>>2876 - getting a t3 flanged turbo is going to be way easier for 500hp. Some people have done the smaller housing 30r's on bottom mount with a t3 flange (not the big monster s cover :P). thats what kazamas car has i think. I like topmount for how cramped it can get

doesnt steve shadows make like 420 on his 30r setup?

[fliprayzin240sx]

Dyno sheets of people running GT3071s please...

[Tearlessj]

gt2871r .86 is good for 450whp.

[slideways2004]

which will give better response/drive ability?

[CKAMC]

if you want 500whp earlier on your looking at a 3076 63ar, if you want to top out then 3071 82 might hit it but you need head work

35r will do it but be laggy, but will definately do it

my thesis is based on sr20, ka an rb25 are a different story.

[S14DB]

3071 .86ar and 272* cams

[Teambadrun]

if you want 500whp earlier on your looking at a 3076 63ar, if you want to top out then 3071 82 might hit it but you need head work

35r will do it but be laggy, but will definately do it

my thesis is based on sr20, ka an rb25 are a different story.

The 3076R will not make 500rwhp unless you pull a rabbit out of mr.slaves arse..

actually id go a 3071R (if you want a garrett turbo that is) on a 2litre and youll make ~350-400rwhp on high boost and cams and stuff to match it..

I REALLY recomend a stroker kit on a 3076R as it'd just be unuseable otherwise :( fark loads of head porting helps allot and ive seen this on my engine so maybe you want to do that anyway???

[GSXRJJordan]

the turbine is the exhaust side :P i know what u are trying to say tho (btw 3071>>>>2876 - getting a t3 flanged turbo is going to be way easier for 500hp. Some people have done the smaller housing 30r's on bottom mount with a t3 flange (not the big monster s cover :P). thats what kazamas car has i think. I like topmount for how cramped it can get

doesnt steve shadows make like 420 on his 30r setup?

Whoops, yeah, fixed. The OP just threw out the 500hp number, so he's probably comparing it to other "500hp" factory cars, which measure crank hp, not wheel, of course.

Steve (with a stock block, stock compression, greddy IM, 264 in/ex cams, single scroll 3071 .63, and his tuning magic) made somewhere around 420whp on a DynoDynamics dyno (which reads low anyhow) on shitty CA pump gas. If you use the typical 15% drivetrain loss formula, 500 crank hp = 425whp. He had a beautiful power curve too...

Back on topic, Teambadrun has the same point I do - the 3071R .63 is about he biggest most of us would want to go on a 2.0L motor. And top mount T3 with a quality external wastegate is the only way to make it happen.

[sunnys14]

Sorry GSXRJordan but you got it mixed up.

GT2876r has the same turbine wheel as the GT2871r but a bigger compressor wheel.

Gt3071r has the same compressor wheel as the GT2871r but a bigger turbine wheel.

GT2871r = T28 turbine wheel, 71mm compressor wheel
GT2876r = T28 turbine wheel, 76mm compressor wheel
GT3071r = GT30 turbine wheel, 71mm compressor wheel

Both GT2876r-WG and GT3071r-WG are pretty much rated the same HP.

Gt3076r is just the GT2876r compressor wheel with the GT3071r turbine wheel. All they did was take half of each turbo and combined it to make a GT3076r.

so to make things short...
GT3076r = GT30 turbine wheel, 76mm compressor wheel

Go to ATPturbo.com and look at the specs of each turbo and you will know what I'm talking about.

[McRussellPants]

GT2871 53mm exhaust
GT3071WG 56mm exhaust (84trim and 90 trim)
GT3071 60mm Exhaust
GT3076WG 56mm exhaust
GT3076 60mm Exhaust

[hinds90]

Sorry for the thread jack but I'm trying to decide between these 2 turbos for my ka. How do you guys think the gt2871r 86. A/r will do on the ka.

[corriganjoshua]

Sorry for the thread jack but I'm trying to decide between these 2 turbos for my ka. How do you guys think the gt2871r 86. A/r will do on the ka.
Some of you need to make your questions not so blunt. 2 turbos you have one you listed i dont see a second. No idea what your shooting for, and if you have a fully built race KA or a stock KA with a filter? Not to be a dick but this is just an example.

[hinds90]

Sorry about that stock engine. I may add cams not sure yet. Looking for a max whp of 320-350whp. Trying to decide between gt2876r 86. A/r. and gt2871R 84. a/r. I know the gt2871r is smaller and will choke up top but i guess thats where cams come into play.

[SILVIA_KIDs14.5]

ok this is the line up i got for the head its a jun racing stage 2 head kit with 272* cams, solid piviots, ras, oversides valves +1mm, will be fully ported, adjustable cam gears. ect the works basicly. right now i'm just trying to get some thing that can compete well on the drag strip with out spending a tone of cash if this helps let me know