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    Thread: Audi TT225 Compound Turbo Build

    1. Member
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      06-08-2012 07:21 PM #1
      Ok, I have a build thread for this in the TT MK1 forum, but I figure I'll post it here too since I'll be meeting alot of you guys as soon as its done. Enjoy

      Motor built and installed with powder coated valve cover and SEM intake mani









      Both turbos back from welding and powder coat






      Last edited by Dowski12; 12-14-2012 at 08:22 PM.

    2. Member
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      06-08-2012 07:25 PM #2
      IC mounted and cold side pipe finished and looking pretty






      Header welded up and polished, ready for chrome ceramic coating





      More to come...

    3. Member vegaspassat's Avatar
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      06-08-2012 08:22 PM #3
      kick ass keep us posted!
      Quote, originally posted by Mr. Rabboto »
      You punched a girl and didn't knock her out? Puss.

    4. Member hans j's Avatar
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      06-08-2012 09:06 PM #4
      Awesome project!
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    5. Member
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      06-08-2012 09:26 PM #5
      Thanks fellas, definitley will keep updating as things are happening.

    6. Member Hybrid_Hatch's Avatar
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      06-08-2012 10:35 PM #6
      I'll be watching this for sure!

    7. Member corradoswapT's Avatar
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      06-11-2012 06:21 PM #7
      pardon my ignorance, but what is the real bennifit of a compound turbo set up on a small motor that really cant handle high boost? Ive seen diesels run these to acheive 120-140 psi but thats a cummins running 8 seconds. a sequential turbo setup I can understand. anyhow I cant wait to see how this turns out.

    8. Member
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      06-11-2012 07:26 PM #8
      Imagine a 500hp car that spools somewhere in the ballpark of 2500rpm. That is the benefit of having a compound turbo car. Yes, diesels have been doing this for a long time and some have pushed their boost all the way to 200psi and thats great if your motor can take it. You also have to consider that diesel motors rev much lower than our cars and have narrower power bands, so they have a much smaller window to utilize the power their creating. We don't need to creat 120psi to make big power like they do. 30psi is considered a relatively high operating pressure on small motors like ours, but in reality I could push this setup to around 50-60psi as long as the motor can take it. I'd rather not blow my motor up so in the mean time, i'll stick with 30
      Last edited by Dowski12; 06-11-2012 at 07:57 PM.

    9. Member corradoswapT's Avatar
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      06-11-2012 07:58 PM #9
      makes sence. sounds like this is going to be a beast at launch!

    10. Member
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      06-11-2012 09:20 PM #10
      Yeah as long as it doesn't explode and "launch" me straight to the moon If you wanna check out some end results, look up streetfighter on youtube. Its pretty sick

    11. Member
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      06-11-2012 09:22 PM #11
      Got my Sigma 6 short shift kit in the mail


    12. Member Levi20AE's Avatar
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      06-11-2012 10:18 PM #12
      What turbo combination will you be running?

    13. Member
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      06-12-2012 12:13 AM #13
      The small turbo is a VF39 from a WRX and my large turbo is a 60-1. At first they weren't a perfect match up so we swapped the 39mm wheel in the VF for a 40. We also changed it from a journal bearing to a dual ball bearing to make sure the bigger wheel didn't hurt spool at all. Great thing about this combination is if in the future I decide to up my hp, its just a matter of swapping the 59mm in the 60-1. With my housing I can fit all the way up to a 67mm before I would have to swap turbos, and as long as I dont swap hotsides it will still match up with the VF39.

    14. Member
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      06-12-2012 05:52 PM #14
      Throwing around the idea of making a full tube frame for my car. What do you guys think?

    15. Forum Sponsor pete@integrated's Avatar
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      06-12-2012 06:05 PM #15
      Skip it, if you plan on ever driving it again...
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    16. Member
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      06-12-2012 07:01 PM #16
      Why's that?

    17. Forum Sponsor pete@integrated's Avatar
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      06-13-2012 11:09 AM #17
      It'll just be a terrible street car by the time you are done, guaranteed. To be honest, if you want a nice street car throw on the VF40 or a GT3071r and be done.

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    18. Member
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      06-13-2012 02:34 PM #18
      haha...Im alittle past just slapping on a single turbo, and this is not just a street car. Eventually this wont see the street except maybe for quick fun runs through the canyons or maybe to the corner store when Im getting the itch to drive it

      Agreed though, that with a tube frame it would make a horrible street driven monster haha.

    19. Member Levi20AE's Avatar
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      06-13-2012 07:01 PM #19
      Take no offense to this question, but have you built a big turbo car before? A 3076 will get you really close to your power goals on a AWD and it will be livable. Be fast on the track is all about seat time in a predictable car. You will have more time to spend suspension tuning, which really brings your times down. Why compound turbos? You have six gears, just pick the right one and you will always be in the powerband. Buying tires will keep you broke if you keep it out at the track much anyways. Best of luck, and have fun with it.

    20. Member
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      06-13-2012 07:17 PM #20
      haha...no offense taken what so ever. Yes I've had big turbo cars before, but not on a VAG car. I really want something that will out perform anything I could do with a single turbo. Yes, I could just buy a 3076 and I know I could be happy with it, but I also know I will get tired of my current setup at some point and would really like to be able to push the limits without having to buy a new turbo. Ideally, I could swap my 59mm with a 67 and make close to 700hp (I couldn't dream of doing that with a 3076). I also wanted to do something new, something no one else has done on a 1.8T. Not to mention its just plain bada$$

      I know not everyone is going to agree with me, and that is almost always the case when doing something different, but as long as I'm happy with it in the end thats all that really matters to me.

      In the works of getting a sponsor for tires so should be covered there
      Last edited by Dowski12; 06-13-2012 at 09:56 PM.

    21. Member
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      06-14-2012 03:11 AM #21
      Sigma 6 Short Shifter Installed




    22. Member
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      06-21-2012 11:42 AM #22
      Just thought I would snap a couple of pics, since the turbos should be in the car in the next day or two...stay tuned




    23. Member
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      07-06-2012 09:43 PM #23
      Turbos are finally in the car...









      Everything is tach'd in place for now and I'll try and get better pictures of the header and up pipe later. We still need to fab up the pipes for the waste gates and the elbow from the large turbo to the small turbo's inlet, but I'm pretty happy with the current progress

    24. Member
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      07-20-2012 02:46 AM #24
      Not much progress, but its somethin...





      I know the transition pipe between the turbos is welded and ground so I'll get more pics tomorrow morning.
      Last edited by Dowski12; 07-20-2012 at 02:55 AM.

    25. Member DarkSideGTI's Avatar
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      07-20-2012 01:31 PM #25
      That tiny turbine housing is a big restriction for the second turbo. I don't see this having much top end.

      If you wanted to go custom and have great spool I think a GTX3076R with a modified twin scroll housing would be pretty slick. People are adding a flapper in the twin scroll housing with an actuator so you can spool quickly without having a twin scroll manifold.

      Last edited by DarkSideGTI; 07-20-2012 at 01:40 PM.

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