DIY Turbo Discussion greddy on a 1.8? homebrew kit?

2871 vs 3071

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Old 01-22-2018, 10:22 AM
  #21  
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Old 01-22-2018, 10:30 AM
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Originally Posted by ridethecliche
Wasn't asking about the compressor A/R per se.... I asked for the A/R, but looking at specs online... it looks like that was what was reported to me. /shrug.

But turbo's are fun Scott!
turbos. possessive? come on.


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Old 01-22-2018, 10:34 AM
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Originally Posted by Braineack
turbos. possessive? come on.


Thanks for that. Like I said, I asked and was apparently given the compressor A/R instead of the turbine. I couldn't make out info from the pictures but that's what I was told.
Re: possessive. Thank you swype!

Originally Posted by concealer404
Just do everything Pat did. Start at the beginning of his build thread and work your way forward.
On it!
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Old 01-22-2018, 10:37 AM
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just fwiw: compressor a/r has little to no affect on spool.
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Old 01-22-2018, 10:50 AM
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Here's an easy one: don't buy a turbo from a vendor stupid enough to give you compressor a/r instead of turbine a/r
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Old 01-22-2018, 10:53 AM
  #26  
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lol vendor

he's trying to swoop it up on CL or some jank forum member who doesn't even know what a/r means.

my only question is: you were saying you wanted to do things right. why are you looking at jank setups again just to save a few bucks? isn't the definition of insanity doing the same thing over and over and expecting different outcomes? or something to that effect
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Old 01-22-2018, 11:00 AM
  #27  
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OP...before you go buying stuff with specs that you don't understand, figure this out.
What is "A/R" and what does it mean?
Let's say you have a 2560 turbo with a .64 housing, then you have the exact same turbo with a .86 housing.
Which one will spool faster? Why? How does this number impact these effects?
Seriously, figure the answer to those questions out, and you will feel much better about what you're looking to purchase.
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Old 01-22-2018, 11:30 AM
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Originally Posted by psyber_0ptix
You should twin scroll 7163 and report back

Is there anyone that has a twin scroll 6758/7163 on this forum.
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Old 01-22-2018, 11:33 AM
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Old 01-22-2018, 12:43 PM
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Originally Posted by matrussell122
Is there anyone that has a twin scroll 6758/7163 on this forum.
Give me 6 months, I'll probably have a twin scroll 7670 by then.
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Old 01-22-2018, 12:46 PM
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Originally Posted by patsmx5
Give me 6 months, I'll probably have a twin scroll 7670 by then.
I like dis.
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Old 01-22-2018, 12:52 PM
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You are Pat, by default you cannot run anything smaller than 9180

do it

DO EEEEEEEEET
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Old 01-22-2018, 01:40 PM
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Originally Posted by patsmx5
Give me 6 months, I'll probably have a twin scroll 7670 by then.
I give it 4.
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Old 01-22-2018, 07:20 PM
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Originally Posted by 18psi
...9180
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Old 01-24-2018, 03:27 PM
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For the OP, The 2871 and 3071 are almost identical turbos. The "28" is referring to the T2 exhaust flange, and the "30" is for a T3 flange style. I believe the 2871 uses the same exact compressor wheel but the turbine is cut down a little smaller to fit into the T2 exhaust housing. The difference in spool between the turbos assuming .64 a/r for the 2871R and .63a/r for the 3071R will be within 300-400rpm...the 2871 will outspool the 3071. The 3071 can make more power once you hit the 350whp threshold.

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Old 01-24-2018, 05:10 PM
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Originally Posted by andyfloyd
For the OP, The 2871 and 3071 are almost identical turbos. ... but the turbine is cut down a little smaller to fit into the T2 exhaust housing.
i.e., not the same turbo.

you also forgot the compressor IS actually different...
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Old 01-24-2018, 05:39 PM
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Which of the three available 2871R compressor wheels are we referring to?

(Buy an EFR)
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Old 01-24-2018, 07:37 PM
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i may have been looking at the wrong turbo, rofl. (for some reason I thought the 2871 had a different trim size wheel) still differences in turbines make a big difference -- not even the difference in overall size/trim, the 2871 has 9 blades where the 2071 wheel has 10 blades.

there are plently of turbines that share the same compress wheels, but i wouldn't call the "almost identical"

like a 2860 and 2650.


(buy an EFR)
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Old 01-24-2018, 08:28 PM
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Are you referring to the 56.5mm T25 3071R turbine, or the 60mm T3 3071R turbine?

(please buy an EFR so someday I can forget all I know about Garretts)
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Old 01-24-2018, 08:51 PM
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Originally Posted by Braineack
i may have been looking at the wrong turbo, rofl. (for some reason I thought the 2871 had a different trim size wheel) still differences in turbines make a big difference -- not even the difference in overall size/trim, the 2871 has 9 blades where the 2071 wheel has 10 blades.

there are plently of turbines that share the same compress wheels, but i wouldn't call the "almost identical"

like a 2860 and 2650.


(buy an EFR)
So see how it can be a little confuzzling for someone that's been doing this for a year and change when you've been at it for over a decade and still get bamboozled!

Originally Posted by Savington
Are you referring to the 56.5mm T25 3071R turbine, or the 60mm T3 3071R turbine?

(please buy an EFR so someday I can forget all I know about Garretts)
Someday!!!


But for now...
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