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Old 05-26-2016, 01:48 AM   #1
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Default GT2871 AR .86 for 1.6. Keep or return?

I got a good deal on a China GT2871 with a .64 AR hot side for my 1.6. Unfortunately when I got the new turbo, it had a .86 AR hot side instead of the .64 AR it was listed as. The turbo is on the big side for my 1.6. Do you guys think I should try to return the .86 AR for a .64 AR or try it out. My current setup is a T28, megasquirt, and injectors. Runs good. Looking to upsize my turbo but not have massive turbo lag. Not my daily driver.

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Old 05-26-2016, 02:06 AM   #2
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It will not spool well in the slightest.
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Old 05-26-2016, 02:21 AM   #3
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Originally Posted by Savington View Post
It will not spool well in the slightest.
That's what I was thinking. I may be able to send it back and get a GT2860 .64 AR instead. Think that it would spool okay with my 1.6?

The turbo I have now has a .86 AR hot side and a .42 AR cold side. Not sure of the wheel sizes. Feels a little laggy but doesn't run out of boost.
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Old 05-26-2016, 04:32 AM   #4
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Would you be interested in a Twisted motion gt2871 with better specs?
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Old 05-26-2016, 10:14 AM   #5
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Quote:
Originally Posted by Wade5k View Post
Would you be interested in a Twisted motion gt2871 with better specs?
this is not a want to buy thread
and your 2871 is not any better
at all

Last edited by 18psi; 05-26-2016 at 11:12 AM.
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Old 05-26-2016, 11:09 AM   #6
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You need a 2560.
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Old 05-26-2016, 11:13 AM   #7
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I guess it depends on his definition of "lag".
but I'd agree with Ryan that anything past a 2560 on a 1.6 is going to be laggy

chinachargers especially so since they tend to come on really lazy
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Old 05-26-2016, 11:18 AM   #8
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Noted. And why so serious? But in theory shouldn't it be since it has the AR number he was looking for?
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this is not a want to buy thread
and your [crappy] 2871 is not any better
at all
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Old 05-26-2016, 11:23 AM   #9
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Because a 2871 on a 1.6 is a stupid idea and will spool horribly. No AR will fix that.
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Old 05-26-2016, 11:26 AM   #10
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Not that serious, just don't like opening the "new threads" to see you offering your stuff to everyone and their mother.

As for the last part: it might be a teensy bit quicker to spool than his current one, but likely won't make any difference at all since that's not his main problem. Like Lars said
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Old 05-26-2016, 12:04 PM   #11
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Quote:
Originally Posted by shuiend View Post
Because a 2871 on a 1.6 is a stupid idea and will spool horribly. No AR will fix that.
This is the correct answer
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Old 05-26-2016, 12:04 PM   #12
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Sorry about that lol I changed my setup up and realized I'm sitting on quite a few extra parts. And wandered out of the WTB section when exploring the forum.

And I agree with you guys on going with the smaller turbo I thought I wanted bigger power then the GT2554 gave me but 2 months into the 2871 and Im learning power definately is nice but spool was more important to me. Just didn't know what OPs goal with the car was
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Not that serious, just don't like opening the "new threads" to see you offering your stuff to everyone and their mother.

As for the last part: it might be a teensy bit quicker to spool than his current one, but likely won't make any difference at all since that's not his main problem. Like Lars said
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Old 05-26-2016, 02:58 PM   #13
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Thanks guys and thanks for not roasting me on my first post. GT2560 it will be. It's actually going in a project car that is hopefully several hundred pounds lighter than a stock Miata. should be fun. Almost done. I'm picking up the chassis and body panels from the powdercoater tomorrow. Here are a few pictures of what was one of my Miatas. These are pre Powdercoat, bare metal.
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GT2871 AR .86 for 1.6.  Keep or return?-80-img_20160501_123249_893803258af77488fca871874d9c77bf16ca3af0.jpg  
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Old 05-26-2016, 03:01 PM   #14
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Wasn't there a user on here that ran a 2871r on his 1.6 powered RX7? Anyways his peak hp was pretty crazy (I think it was a relatively stock motor?), but about 2k of useable powerband before redline.
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Old 05-26-2016, 03:08 PM   #15
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Pictures



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GT2871 AR .86 for 1.6.  Keep or return?-80-img_20160501_123032_5b19d7652c04fcad499f59e9c1681b4d971fc83e.jpg   GT2871 AR .86 for 1.6.  Keep or return?-80-img_20160501_123142_78669702508886d06adcf1e7067d04c39fe68200.jpg   GT2871 AR .86 for 1.6.  Keep or return?-80-img_20160501_123813_4679ce3273fa0848432d211b25573a85efa7eb8d.jpg  
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Old 05-26-2016, 03:08 PM   #16
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Quote:
Originally Posted by Del View Post
[IMG]https://www.miataturbo.net/attachment.php?attachmentid=172559&dateline=146428 5521[IMG]

Thanks guys and thanks for not roasting me on my first post. GT2560 it will be. It's actually going in a project car that is hopefully several hundred pounds lighter than a stock Miata. should be fun. Almost done. I'm picking up the chassis and body panels from the powdercoater tomorrow. Here are a few pictures of what was one of my Miatas. These are pre Powdercoat, bare metal.
that's going to be a LOT of fun
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Old 05-26-2016, 03:26 PM   #17
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Quote:
Originally Posted by .one lane View Post
Wasn't there a user on here that ran a 2871r on his 1.6 powered RX7? Anyways his peak hp was pretty crazy (I think it was a relatively stock motor?), but about 2k of useable powerband before redline.
I ran a 0.86a/r 2871R on a VVT 1.8L motor and didn't think the response was terribly impressive. It made decent power down low, but that was owed to E85 and tons of timing. I've driven 0.86a/r GT2860RS 1.6L cars and it was even worse than my 2871R 1.8L. I can't imagine how laggy a 2871R 1.6L car would feel.

The 2560R is a far better choice.
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Old 05-26-2016, 03:30 PM   #18
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Greg's 2554r with the billet wheel did some impressive numbers as well.

Just playing devils advocate
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Old 05-26-2016, 03:56 PM   #19
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is your current t28 a ball bearing unit? From my understanding, a 2560 is a t28? 2560s/t28 journal bearing and 2560r/t28r ball bearing?
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Old 05-26-2016, 04:13 PM   #20
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Quote:
Originally Posted by mmmjesse View Post
is your current t28 a ball bearing unit? From my understanding, a 2560 is a t28? 2560s/t28 journal bearing and 2560r/t28r ball bearing?
No, It's not a ball bearing unit. It's a little confusing because my existing turbo has a .42 AR compressor / cold side housing and a .86 AR Hot side Turbine housing. I figure the .86 Hot side is not great for spooling so I would like to go smaller. Here is a picture of the tag from the china turbo that's on the car now.
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GT2871 AR .86 for 1.6.  Keep or return?-80-20160422_020147_e1f1d3c88de30fff9ad655dedfbb562676c50214.jpg  
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