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Old 07-02-2013, 08:37 PM   #1
BONFIRE074
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Default Why nobody runs a gt2871r ?

Such a common turbo for other cars, but seems that hardly anyone runs a gt2871r on a 2.0 or a 2.5, how come? i know there are a few guys out there running them but not nearly as many as i would think.
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Old 07-02-2013, 08:46 PM   #2
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3076 FTW. JK I dunno either. I think it has to do with for the money type of thing.
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Old 07-02-2013, 08:56 PM   #3
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easy..the none GTX model didnt make much peak power over a stock turbo and cost alot more.

You have seen this thread right?
http://forums.nasioc.com/forums/show....php?t=2509735
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Old 07-02-2013, 09:28 PM   #4
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there's a lot of area under the curve on that turbo you linked to... that car probably pulls pretty decent
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Old 07-03-2013, 12:00 AM   #5
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The 2871r always ended up with poor spool for the power. There were a few versions of it, but mainly the housings that were stock location were made to be universal to also fit 3071 / 3076, so they were too large for the GT28 to perform well in. People rotating were often looking bigger than that.

Look towards the GTX2865, EFR6258 and EFR6758 for small-ish turbos with broader powerbands. None of these solutions are cheap, but these are some of the first steps I've seen that seem significantly better than the old 16G Evo III --> 20G sized mitsu turbos.
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Old 07-03-2013, 02:08 AM   #6
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Quote:
Originally Posted by Concillian View Post
The 2871r always ended up with poor spool for the power. There were a few versions of it, but mainly the housings that were stock location were made to be universal to also fit 3071 / 3076, so they were too large for the GT28 to perform well in. People rotating were often looking bigger than that.

Look towards the GTX2865, EFR6258 and EFR6758 for small-ish turbos with broader powerbands. None of these solutions are cheap, but these are some of the first steps I've seen that seem significantly better than the old 16G Evo III --> 20G sized mitsu turbos.

Exactly, my stock location AVO420 which is their larger variant of the 2871 doesn't make peak tq till 4500 and even then was only 312tq. I only know of one avo380 that had a nice powerband. There is another guy with a rotated 2871 but like Concillian said most rotated people go for a larger turbo. I'd be pissed if I had payed anywhere near full price for my turbo for what it makes.
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Old 07-03-2013, 02:16 AM   #7
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now on the other hand the GT2860R would yield excellent spool and plenty of under the curve power, but the peaks would be minimal over a stock sti turbo. a friend of mine was able to make some 300+ whp on a cracked tune himself, but stupid early spool. later switched to a vf43 and liked the curve it gave overal. i think the disco potata is best for the 2.0 motor with the 2.5 you can spool things much nicer... (not always a 30r though)
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Old 07-03-2013, 11:41 AM   #8
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now on the other hand the GT2860R would yield excellent spool and plenty of under the curve power, but the peaks would be minimal over a stock sti turbo. a friend of mine was able to make some 300+ whp on a cracked tune himself, but stupid early spool. later switched to a vf43 and liked the curve it gave overal. i think the disco potata is best for the 2.0 motor with the 2.5 you can spool things much nicer... (not always a 30r though)
BUT it has a BB center housing so the transient response, which is whats really important when actually driving not just doing dyno pulls will be much better. I keep trying to find real good graphs of the stock location GT28RS or 16g XTR on 2.5, and they dont exist. Some of us with 2.5s dont want to buy someone's crummy used turbo, and also think that journal bearing turbos belong in the 90s and would be perfectly satisfied with making over 300hp with BB turbo transient response and good low end.

If I wasn't trying to hold myself to no fab work on the daily I would just be making my own UP and DP to run an EFR6758.
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Old 07-21-2013, 10:00 PM   #9
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Jus tuned with Chris from ams, my leggy put out 309/302 @16psi on a gt2871r. Did a run 329/334 @18psi but was leaning out due to fuel pump crapping out. Nothing crazy but feels good and loving it
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Old 07-22-2013, 04:04 AM   #10
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Jus tuned with Chris from ams, my leggy put out 309/302 @16psi on a gt2871r. Did a run 329/334 @18psi but was leaning out due to fuel pump crapping out. Nothing crazy but feels good and loving it
Which 2871r did you go with? Stock location? Any graph?
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Old 07-23-2013, 04:48 AM   #11
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Originally Posted by BONFIRE074 View Post
Which 2871r did you go with? Stock location? Any graph?
It's a stock location gt2871r. Here's the dyno graph from the other day.

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Old 07-23-2013, 08:18 AM   #12
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I that with an MBC or an EBC?
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Old 07-23-2013, 08:25 AM   #13
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here is a rotated gtx2863, wicked tq and it comes on fast.

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Old 07-23-2013, 08:26 AM   #14
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It's a stock location gt2871r. Here's the dyno graph from the other day.
This is a nice power band for running through gears as you hold good power up top. But its just not worth it over a stock turbo. And for the money there are other turbos that provide both low end torque and hold up top.
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Old 07-23-2013, 04:51 PM   #15
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I that with an MBC or an EBC?
Grimmspeed ebs

Quote:
Originally Posted by bebesito21 View Post
This is a nice power band for running through gears as you hold good power up top. But its just not worth it over a stock turbo. And for the money there are other turbos that provide both low end torque and hold up top.
This was tuned at 16psi. Although I do agree there is a lot of turbos that can do both, I'm jus dealing with what I got delt.
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Old 07-23-2013, 08:26 AM   #16
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here is a rotated gtx2863, wicked tq and it comes on fast.
How is this an improvement over the stock turbo lol?
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Old 07-23-2013, 08:31 AM   #17
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How is this an improvement over the stock turbo lol?
Its has a ball bearing center housing. I have a td04, I want something in the vf39 size area with a ball bearing center housing. Now they just need to make a stock location gtx2863 and see if the subaru housing chokes it up.
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Old 07-23-2013, 10:52 AM   #18
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Quote:
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Its has a ball bearing center housing. I have a td04, I want something in the vf39 size area with a ball bearing center housing. Now they just need to make a stock location gtx2863 and see if the subaru housing chokes it up.
Why not a VF34 then?
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Old 07-23-2013, 11:05 AM   #19
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Why not a VF34 then?
Because they're still $1200.
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Old 07-23-2013, 09:23 AM   #20
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well up here we don't have E85 and a stock STi on that dyno is 220hp so That is a great improvement. our 91 is pretty ****y and is the highest we can get.
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Old 07-23-2013, 09:46 AM   #21
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Nobody uses it because the STI turbo's do the same thing, bolt right up and can be had dirt cheap.
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Old 07-23-2013, 09:50 AM   #22
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Nobody uses it because the STI turbo's do the same thing, bolt right up and can be had dirt cheap.
You dont understand transients. Take a BB and JB turbo of the same size, be coasting over 4krpm and stomp the throttle, you'll be willing to pay a grand more for the BB version after doing that back to back.
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Old 07-23-2013, 12:49 PM   #23
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well up here we don't have E85 and a stock STi on that dyno is 220hp so That is a great improvement. our 91 is pretty ****y and is the highest we can get.
Yeah a stock sti. But a stage 2+ probably makes the same power. I hear you on the transient response of ball bearing turbos but on turbos this small do you really notice that much of a difference? I doubt it. For the money and work involved i would get something bigger....now the gtx 28xx is another story. That is an improvement over stock...
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Old 07-23-2013, 07:51 PM   #24
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Yeah a stock sti. But a stage 2+ probably makes the same power. I hear you on the transient response of ball bearing turbos but on turbos this small do you really notice that much of a difference? I doubt it. For the money and work involved i would get something bigger....now the gtx 28xx is another story. That is an improvement over stock...
A stage 2 makes 270ish depending on the day, with meth they make 300... so no not the same power and no where near that amount of tq
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Old 07-23-2013, 10:02 PM   #25
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A stage 2 makes 270ish depending on the day, with meth they make 300... so no not the same power and no where near that amount of tq
i had this whole long response typed up with like 20 examples of cars with few mods making 300+ whp and 350+ wtq on vfs but honestly, it doesnt matter....if you like your setup awesome man, more power to you.

imo, its not worth it to "upgrade" from a vf for results like yours. the other gtx (link posted earlier in this thread) though is a monster and more like the perfect DD setup.
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