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Old 05-27-2018, 08:10 PM   #1
subaru_gc8
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Default garrett g25-660

Hey I was wondering if anyone has tried this turbo yet? sounds like its inbetween a 3071 and a 3076 gen 2 size.
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Old 05-27-2018, 10:45 PM   #2
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TheBoostCreep posted up a video of it on fb, on a wrx. It looked pretty impressive.
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Old 05-28-2018, 08:12 AM   #3
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its smaller than both of those tubros but outflows the 3071. its badass.
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Old 05-30-2018, 07:37 PM   #4
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It's a 2867 in physical size but flows like a 3071 gen2. It should out perform anything smaller than the 3076 if you use the largest turbine housing.
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Old 05-31-2018, 12:26 AM   #5
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Quote:
Originally Posted by Nick411 View Post
It's a 2867 in physical size but flows like a 3071 gen2. It should out perform anything smaller than the 3076 if you use the largest turbine housing.
Wow that makes it sound even better might have to pull the trigger on that one
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Old 06-01-2018, 01:25 PM   #6
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I'm watching these closely. Might make me trade in my EFR turbos.
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Old 06-01-2018, 03:47 PM   #7
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I'd be curious how transient is. For everything but autox the G25's look good. Anywhere transient is important I'd still pick an EFR, personally.
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Old 06-02-2018, 04:03 AM   #8
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Originally Posted by subydude View Post
I'd be curious how transient is. For everything but autox the G25's look good. Anywhere transient is important I'd still pick an EFR, personally.
I did the back of the envelope math, the rotational inertia of the G25-660 is close to that of the EFR7163.
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Old 06-02-2018, 12:15 PM   #9
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Quote:
Originally Posted by spdracerut View Post
I did the back of the envelope math, the rotational inertia of the G25-660 is close to that of the EFR7163.
So the wheel is smaller, but denser is what you're saying. Interesting.

I like market competition.
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Old 06-02-2018, 04:35 PM   #10
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Default garrett g25-660



oddly enough this came across my FB feed today so i figure i would share it.

red is a g25-660
blue is a gtx3076

its on an 04 australian sti so i believe that is an EJ207. figures are in KW not HP.

you got about 10psi at about 4000rpm and 30psi at about 4900rpm

the extra volume of a 2.5L would make this turbo come alive a bit earlier.
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Old 06-02-2018, 06:43 PM   #11
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^^^ the 3076 is a gen1 R with a .64 a/r and the g25 has a .92a/r.
Awesome how it makes an extra 100kw at 4700rpm.
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Old 06-03-2018, 02:56 PM   #12
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Originally Posted by ripman View Post
^^^ the 3076 is a gen1 R with a .64 a/r and the g25 has a .92a/r.
Awesome how it makes an extra 100kw at 4700rpm.
Are they both utilizing stock location?
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Old 06-03-2018, 04:41 PM   #13
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Are they both utilizing stock location?
Rotated
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Old 06-03-2018, 06:21 PM   #14
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it seems like the g25 spools kinda slow for being so small, dont you think
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Old 06-03-2018, 07:46 PM   #15
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Originally Posted by subaru_gc8 View Post
it seems like the g25 spools kinda slow for being so small, dont you think
The 0.92 A/R used flows the same as a GT30 in a 1.01 A/R. So the fact he G25-660 still spooled up faster with a bigger housing than the GTX3076R in a much smaller 0.64A/R housing shows just how much more efficient the G25-660 is. Put the smaller 0.72A/R or the much smaller 0.49A/R and it'll spool up much sooner.
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Old 06-03-2018, 09:59 PM   #16
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Quote:
Originally Posted by subaru_gc8 View Post
it seems like the g25 spools kinda slow for being so small, dont you think


also, that graph is from a 2.0L. a 2.5L would spool a bit faster due to itís extra volume.
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Old 06-04-2018, 10:42 AM   #17
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Yeah, a 2 liter with cams isn***8217;t exactly going to spool a turbo up super early. I think it did pretty damn good.

Last edited by wrxhard; 06-04-2018 at 06:53 PM.
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Old 06-04-2018, 02:47 PM   #18
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Also Garrett said they are working on divided housings, they only over a single scroll housing right now. Thats good for quite a bit earlier/smoother spool and better transient response on throttle. I sold my 3076 in anticipation of this being a better suit for a EJ20 so im holding off for a smaller divided housing option.
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Old 06-04-2018, 07:11 PM   #19
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Quote:
Originally Posted by subydude View Post
I'd be curious how transient is. For everything but autox the G25's look good. Anywhere transient is important I'd still pick an EFR, personally.
Quote:
Originally Posted by spdracerut View Post
I did the back of the envelope math, the rotational inertia of the G25-660 is close to that of the EFR7163.
That's it, you're both getting thrown out for speculation
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Old 06-04-2018, 10:41 PM   #20
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That's funny, I remember guesstimating it'd be close to EFR rotational inertia back in November on MotoIQ
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Old 06-05-2018, 04:06 PM   #21
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Here's a question for you. I'm currently running a GTX3071R gen2 on a built FA20DIT. Once a twin scroll housing is available would this be a viable upgrade? It's a fun street car that spools quickly, not sure if a slightly later spool would bother me.
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Old 06-05-2018, 11:13 PM   #22
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Quote:
Originally Posted by Titter View Post
also, that graph is from a 2.0L. a 2.5L would spool a bit faster due to itís extra volume.
well i got a 2.1 so Id be in the middle. but yeah i guess for a 660 specd turbo i would have expected more I mean at 30psi is at 440 I think the new gen2 3071 is a better turbo
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Old 06-05-2018, 11:13 PM   #23
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Quote:
Originally Posted by undyjr View Post
Here's a question for you. I'm currently running a GTX3071R gen2 on a built FA20DIT. Once a twin scroll housing is available would this be a viable upgrade? It's a fun street car that spools quickly, not sure if a slightly later spool would bother me.


I dont think so. it will be so close that it would be hard to see a difference. it seems to me that this is another e 85 kinda turbo
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Old 06-06-2018, 11:53 AM   #24
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Quote:
Originally Posted by subaru_gc8 View Post
well i got a 2.1 so Id be in the middle. but yeah i guess for a 660 specd turbo i would have expected more I mean at 30psi is at 440 I think the new gen2 3071 is a better turbo

a gen2 3071 probably wont get you more than 440whp on a 2.0L. if it does i would be very suprized. itís only a 59lbs/min turbo where the g25-660 is a 61lbs/min turbo. considering the 660ís smaller size it would spool quicker as well since its turbines weight less.

i know you said youíre a 2.1 but for comparisons sake, i kept things 2.0L
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Old 07-26-2018, 11:44 PM   #25
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Originally Posted by Bansheeboy11 View Post
Also Garrett said they are working on divided housings, they only over a single scroll housing right now. Thats good for quite a bit earlier/smoother spool and better transient response on throttle. I sold my 3076 in anticipation of this being a better suit for a EJ20 so im holding off for a smaller divided housing option.
Check this Garrett part number 877895-5012S. It's a T4 divided .92 AR IWG turbine housing. I am looking for this exact turbine with my twin scroll headers on a 2.0L
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