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GT2871 or K04????????

Guy_s Jul 12, 2012

  1. Guy_s

    Guy_s New Member

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    OK I am looking for some independent advice and where better to come to, than here.

    So my installer is strongly suggesting that I go GT2871 (he has a K04 G5 GTI that runs a 13.28 1/4mile and K03s POLO GTI that runs a 13.71 1/4mil) and up until recently I was defiantly going to do so, but most of my buddies have been suggesting I go K04.

    I currently have the AGU motor which has about 250000 KM on the clock. I do plane on doing the motor before changing the turbo and fitting S3 cams and injectors.

    Although my Audi is not my daily driver I do want something that is reliable and can do 1000km trips at an time. I also want something that goes like hell when I want her to.

    So again GT2871 or K04 it will help if you can support your choice.
     
  2. 16Klappe

    16Klappe I <3 Panda's! Supporter

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    Chalk and cheese springs to mind...

    I suggest you do a LOT more research before starting any work.
     
  3. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    GT2871 will be laggier bottom end but will make more top end power than a K04... maxing a stock K03 and you are looking at 280ish hp... maxing a GT2871 and you are heading up to 370ish hp...

    GT2871 will need larger injectors than S3 ones anyway and S3 cams will make no diffirence as they are the same profile...

    <tuffty/>
     
  4. aragorn

    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    Surely the middle ground is a GT28RS?

    If its currently completely stock, then my advice is to go for a garret from the start.

    by the time you've factored in the cost of a K04 (especially if its a hybrid one) and all the parts that need changed to convert the car to K04 fitment, then you might as well just convert to Big Turbo, and choose a turbo thats the correct size for your power goals.

    If you go K04 (or K04 hybrid) and then decide you want more and end up going big turbo some point later, then everything you've bought already basically ends up useless and needs replaced. Go GT28RS from the start, and you just need to swap out the turbo.
     
  5. N8

    N8 Kowalski Details VCDS Map User

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    2860.
     
  6. BuuBBa

    BuuBBa Member

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    "Goes like hell" ..well then those turbos are not the right choice :ermm:

    Whats Your budget for the build?

    I'm currenlty running with 2871r and think its the right choice for daily driver. Dyno showed ~360hp with 1.3bar but now it has limited the boost to 1bar, so around 310hp I guess.. But some tiny man screams everytime I try to slam the S "Moooooree poweeeer", so here we go again..

    As aragorn said go for the garrett, cause its almost the same amount of money anyway..

    EDIT: How about GTX2867R or GTX2863R?
     
    Last edited: Jul 12, 2012
  7. Guy_s

    Guy_s New Member

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    Thanks for the info Gents so my mind is made up going to go for the GT2871. with S4 injectors
     
  8. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    Why S4 injectors? from what I understand they are rated at 350cc @ 4bar... no where near enough... Siemans Deka 630's @ 3 bar will do the job... Bosch 550's should do too but maybe borderline... 630's are good for 400/450hp

    <tuffty/>
     
    JonBoi25 likes this.
  9. Andyb5tdi

    Andyb5tdi B5 1.9TDi AFN quattro Audi A4 saloon S-line owners group TDi

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    What's the top end power on a Gt2871r out of interest?
     
  10. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    Depends on what else you have used to fit it but on a 1.8t mid to late 300's at a push but its normally working hard to do it... (dyno lottery applies)

    <tuffty/>
     
  11. Andyb5tdi

    Andyb5tdi B5 1.9TDi AFN quattro Audi A4 saloon S-line owners group TDi

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    Thanks dude, was just reading another website and it was suggesting 400 max. I want something that's similar to stock from the off and will do 380-400 without ringing it's neck so to speak. Obviously with all the supporting mods.
     
  12. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    Get a GT3071 with external gate... GT28 will be flat out at that power...

    <tuffty/>
     
    Andyb5tdi likes this.
  13. Andyb5tdi

    Andyb5tdi B5 1.9TDi AFN quattro Audi A4 saloon S-line owners group TDi

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    Thank you, how would the gt3071 be low down?
     
  14. superkarl

    superkarl MAN OF STEEL

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    What you need is a GTX2867....
     
  15. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    No bigger frame turbo will drive like a K04... build it right and it will be fine... don't get hung up on spool either...

    My cars dyno runs...

    GT30/1.8 vs GT35/2.0 (before cams)

    [​IMG]

    GT35/2.0 vs K04 hybrid/1.8 vs std k04/1.8
    [​IMG]

    GT35/2.0/Cams vs std K04/1.8
    [​IMG]

    <tuffty/>
     
  16. hydro s3

    hydro s3 S3 amk Team Ming Blue Audi S3

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    Dont want to hijack this thread but Tuffty that k04 hybrid you have the dyno run tests for is that the hybrid that Bill sells as his package.
    Thanks
     
  17. badger5

    badger5 www.badger5.co.uk Site Sponsor

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    nope.
    our hybrid does more on our lupo demo/test car
     
  18. hydro s3

    hydro s3 S3 amk Team Ming Blue Audi S3

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    Thats good to hear as its on my shopping list.
     

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