New Garrett G25 Turbo
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Thread: New Garrett G25 Turbo

  1. #1
    I spend too much of my life on FST! aaronc7's Avatar
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    New Garrett G25 Turbo

    New Garrett turbos released recently (not sure when, I just came across it today).

    G25-550, 60mm compressor rated for 550hp
    https://www.turbobygarrett.com/turbo...series-g25-550

    G25-660, 67mm compressor rated for 660hp
    https://www.turbobygarrett.com/turbo...series-g25-660

    Compressor efficiency looks great too....very promising I think

    Listed turbine size dimensions similar to GT28... if it can make the power claims while still being that responsive, that would be impressive.

    Last edited by aaronc7; 01-08-2018 at 09:38 PM.

  2. #2
    FST Junkie! djfourmoney's Avatar
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    Skepticism is fine. But I don't think it's worth worrying about if the output claims are legit.

    Firstly, sigh the ST community really needs to understand something. When you deviate from the reference product all sorts of unintended things could happen. For ST owners the G series will solve a couple of problems.

    1) It narrows selection down. Even if more product is on the way and it is, it's for mid-frame turbos that most of you aren't interested in anyway. Both turbos are similar in size to the GTX2860 and GTX2867.

    2) Mid frame power in a small size. My GTX3071 is rated at 650 hp. Where I cannot get clarification is if that is at the wheels or at the crank. If it's at the crank, 578.5 hp (about 11% driveline loss) which is fine but if it's really 650 then that changes the fuel system requirements quite a bit.

    Also with the smaller TB-04B compressor housing I get the smaller 3" inlet (outlets are the same) and I also don't get the additional benefit of the ported compressor housing. The G series eliminates that problem in a vehicle specific kit like the ATP I would enjoy all the benefits of the reference turbo.

    This is why I put max flow of the GTX3071 at 550 hp at the wheels. Powned has already hit 480/420 at 26psi in the early stages of his tune. It should make 500 at 27-28 psi and 550 or so at 30-32 psi.

    With the G series it's simple under <500 = G2-550 500> = G2-660

    Where I don't like the GTX2867 is that it's slightly mismatched. If you have to give up 200-250 rpm of spool to get 25-50 hp I don't think that's a fair trade-off. Where the GS-660 spools likely the same way, you get a whooping helping of output.

    Max output (if the hp ratings are at the crank)

    550 = 489.5
    660 = 587.4

    Full Race and ATP both have these in-stock.

    I've been told that for 2.0L .72 A/R is ideal, .49 A/R is for under 2.0L think Fiesta ST.
    Last edited by djfourmoney; 02-02-2018 at 02:14 PM.
    2016 Race Red ST2 -

    12.97*@108 (1.90 60 ft)
    [email protected]+ (2.35 60 ft)

    * Slicks
    + Street tires @ 30 psi

    Tuned By Torrie
    AEM Water-Methanol Injection (1000 cc, two nozzles)
    Boomba TB Spacer
    Steeda/CPe Intercooler
    ATP GTX3071 Gen II w/High Boost actuator
    Thermal R&D Full Exhaust
    Mountune Intake + K&N Filter
    Mountune silicone hoses + hot pipe w/Turbosmart Vee Port Pro 22mm BOV
    Nitrous Express Dry EFI w/NX Maximizer 4

  3. #3
    FST Member zex24's Avatar
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    Did someone start selling G25-550 kit for ST?

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  5. #4
    FST Junkie! djfourmoney's Avatar
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    No kits yet.
    2016 Race Red ST2 -

    12.97*@108 (1.90 60 ft)
    [email protected]+ (2.35 60 ft)

    * Slicks
    + Street tires @ 30 psi

    Tuned By Torrie
    AEM Water-Methanol Injection (1000 cc, two nozzles)
    Boomba TB Spacer
    Steeda/CPe Intercooler
    ATP GTX3071 Gen II w/High Boost actuator
    Thermal R&D Full Exhaust
    Mountune Intake + K&N Filter
    Mountune silicone hoses + hot pipe w/Turbosmart Vee Port Pro 22mm BOV
    Nitrous Express Dry EFI w/NX Maximizer 4

  6. #5
    FST Senior Member tonyc775's Avatar
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    Any update on kits?


    Sent from my iPhone using Tapatalk

  7. #6
    I spend too much of my life on FST! screzzy's Avatar
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    ATP has this:
    https://www.atpturbo.com/mm5/merchan...&Store_Code=tp

    Sent from my LGUS997 using Tapatalk
    tonyc775 likes this.
    Using Tapatalk

  8. #7
    FST Senior Member BizKhalifa's Avatar
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    JST Performance has kits and giving a free custom tune with them.
    tonyc775 likes this.

  9. #8
    FST Junkie! djfourmoney's Avatar
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    Quote Originally Posted by BizKhalifa View Post
    JST Performance has kits and giving a free custom tune with them.
    I did not see the G2 kits on their website.

    These ATP kits will be much better based on the flow of the new turbine wheels (first in 20+ years from Garrett), especially since the .72 A/R turbine housing is standard which equals flow of the .86 GT25 housing that comes with the GTX kits.

    .92 for rated power (minus driveline losses). One of the things I don't like about the GTX3071 G2 is the smaller 3" inlet and GT25 turbine housing, both limit ultimate output to the low 500's when the turbo is capable of near rated power of 600 with the reference turbo (T3 open turbine housing and 4" anti-surge inlet, with ported cover).
    2016 Race Red ST2 -

    12.97*@108 (1.90 60 ft)
    [email protected]+ (2.35 60 ft)

    * Slicks
    + Street tires @ 30 psi

    Tuned By Torrie
    AEM Water-Methanol Injection (1000 cc, two nozzles)
    Boomba TB Spacer
    Steeda/CPe Intercooler
    ATP GTX3071 Gen II w/High Boost actuator
    Thermal R&D Full Exhaust
    Mountune Intake + K&N Filter
    Mountune silicone hoses + hot pipe w/Turbosmart Vee Port Pro 22mm BOV
    Nitrous Express Dry EFI w/NX Maximizer 4

  10. #9
    FST Senior Member BizKhalifa's Avatar
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  11. #10
    FST Junkie! djfourmoney's Avatar
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    430 hp G2-550 S13 Silvia



    Another SR20 Silvia 485 hp G2-660



    ST should see similar numbers. I knew the 660 would give GTX3071 power in roughly the same package as my current ATP GTX3071 which uses smaller housings than the reference turbo.

    As I said we are using the reference turbo in the ATP kits using the G2 series turbos, which means the rated power numbers are what they are.
    2016 Race Red ST2 -

    12.97*@108 (1.90 60 ft)
    [email protected]+ (2.35 60 ft)

    * Slicks
    + Street tires @ 30 psi

    Tuned By Torrie
    AEM Water-Methanol Injection (1000 cc, two nozzles)
    Boomba TB Spacer
    Steeda/CPe Intercooler
    ATP GTX3071 Gen II w/High Boost actuator
    Thermal R&D Full Exhaust
    Mountune Intake + K&N Filter
    Mountune silicone hoses + hot pipe w/Turbosmart Vee Port Pro 22mm BOV
    Nitrous Express Dry EFI w/NX Maximizer 4

 

 
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