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    Thread: Audi TT225 Compound Turbo Build

    1. Member
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      01 Audi tt225
      07-20-2012 07:19 PM #26
      Your right, I should change my entire setup and go with a single 3076, and be just like everyone else, why didn't I think of that? Nevermind the money I have invested in my current setup...you cant take it with you right?

      On a seriouse note, I'm way beyond a single setup at this point. A compound setup is what I had planned from the first day I bought my TT and I'm sticking to it. It's never been done before on a TT, which in my opinion makes it much more bada$$ than any single turbo setup. And with or without a little flapper on a twinscroll, I bet I still spool faster than any 3076 out there.

      Top end wise I think Ill be ok. Most of the exhaust gasses are going to bypass the smaller housing through the wastegate anyway, so it shouldn't hurt my top end too much. Right now we are going to run a 38mm Tial, but if it proves to be restrictive then we will put a 44mm in its place.

    2. Member DarkSideGTI's Avatar
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      Bagged R32T
      07-20-2012 07:36 PM #27
      There's a reason people go with single 30R setups.

      A 38mm WG is an even bigger restriction than that turbine housing.

    3. Member Levi20AE's Avatar
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      07-20-2012 08:06 PM #28
      what are you doing for stand alone and boost control for both circuits, that is going to be a chore to get to run smoothly and you should look into building a bypass for the first stage turbo. Not only will the exhaust restriction prevent the potential spool of the second stage but the EGTs are going to quickly limit your available power for any duration of time.

    4. Member
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      07-20-2012 09:36 PM #29
      Quote Originally Posted by DarkSideGTI View Post
      There's a reason people go with single 30R setups.

      A 38mm WG is an even bigger restriction than that turbine housing.
      Well, we wont know till its done I guess, that is unless you, yourself have built a compound setup before...must have missed that build thread

      JC has done a similiar setup before, and I have complete confidence in his abilities. If he says it will get me to my power goals then I have no reason to question it.

      Yes the 38mm by it self is a restriction, and yes the smaller turbine housing is a restriction, but the combination of the two should supply the 60-1 with enough flow to make my desired power. As I said before, if the 38mm isn't large enough to get the job done, it will be replaced with a larger wastegate.

    5. Member
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      07-20-2012 10:05 PM #30
      Quote Originally Posted by Levi20AE View Post
      what are you doing for stand alone and boost control for both circuits, that is going to be a chore to get to run smoothly.
      Im using maestro to tune and as far as boost control, right now each turbo will be preset to a specific psi, running off the wastegates. Later I plan on running tandem boost controllers, one for each turbo but controlled by one source(preferably a touch screen) so I can adjust my boost while maintaining the pressure ratio between the turbos.


      Quote Originally Posted by Levi20AE View Post
      and you should look into building a bypass for the first stage turbo. Not only will the exhaust restriction prevent the potential spool of the second stage but the EGTs are going to quickly limit your available power for any duration of time.
      What your describing is a sequential turbo setup, only one turbo is actually producing boost at a time. The smaller one for down low power and then through a solenoid of some kind, the small cuts out and is bypassed just as the larger turbo comes on hard. Totally different setup then what I'm doing and a whole lot more complex. The whole point is to keep both turbos spooled, just bypassing the extra exhaust gasses around the smaller one through the wastegate and back into the larger turbo. The smaller never stops feeding the larger turbo in my setup. The wastegate isn't meant to supply the larger turbo with 100% of it's flow, it's just there to bypass the excess exhaust that the smaller turbo doesn't need to maintain its preset pressure. Being as that this has never been done before on our cars, its going to have to be alittle trial and error before everything is perfect, but I know its doable...I hope

      As far as the EGT's, Im not 100% on how hot this sucker is really going to be. Im going to be running E85, and direct port W/M injection so I'll have to wait and see how high my temps actually get.

    6. Member DarkSideGTI's Avatar
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      Bagged R32T
      07-20-2012 11:33 PM #31
      I know a bit about compound setups. One of my good buddies is running a compound setup on his truck.



      The difference is his small turbo is a GT37R and the large one is a BW S378

    7. Member
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      07-21-2012 12:14 AM #32
      Is he running one wastegate or two? It was explained to me by a diesel guy that the way they run and tune their compound setups is they only use one wastegate on the small turbo, crank up the boost, and control it by tuning their fuel down till they hit their desired level of boost. If that is the case, they don't have to worry about bypassing turbos and what not. I wish my setup could be that easy

    8. Member DarkSideGTI's Avatar
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      Bagged R32T
      07-21-2012 10:41 AM #33
      Is that picture working? You can see a big WG on the large turbo. No point in controlling the smaller turbo, may as well max that out.

    9. Member
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      07-21-2012 11:12 AM #34
      My bad, I said that backwards, I meant on the large turbo. Thats why I was asking because you cant see the small turbo or a second wastegate.

    10. Member DarkSideGTI's Avatar
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      Bagged R32T
      07-21-2012 02:23 PM #35
      I don't think he is. I would though on a car.

    11. Member BRES's Avatar
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      07-22-2012 05:32 PM #36
      HOLY ****?!?! Damn dude, what is your budget on this thing or is $$$ unlimited?
      2012 335i Alpine White Loaded (his) - JB4, BMS downpipe, Active Autowerke Exhaust, ER FMIC
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    12. Member Parker mk4's Avatar
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      07-22-2012 06:25 PM #37
      Do you have Audi tt 225 injectors?
      ig- @parkerlambert

    13. Member
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      07-23-2012 11:52 AM #38
      Quote Originally Posted by BRES View Post
      HOLY ****?!?! Damn dude, what is your budget on this thing or is $$$ unlimited?

      Too Much

    14. Member
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      07-23-2012 11:53 AM #39
      Quote Originally Posted by Parker mk4 View Post
      Do you have Audi tt 225 injectors?

      Sorry Parker, I already sold all my old parts, including the injectors.

    15. Member Parker mk4's Avatar
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      07-27-2012 06:15 PM #40
      Dang..... nobody has them lol
      ig- @parkerlambert

    16. Member DarkSideGTI's Avatar
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      Bagged R32T
      07-27-2012 06:17 PM #41
      Compound turbo TDI.


    17. Member Levi20AE's Avatar
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      07-27-2012 08:11 PM #42
      link to a build thread? looks interesting

    18. Member
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      07-27-2012 11:35 PM #43
      all i can say is amazing, i would love to see behind the engine and see the turbo set up.


      pd tdi at that,

    19. Member vegaspassat's Avatar
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      07-28-2012 10:43 PM #44
      Quote Originally Posted by DarkSideGTI View Post
      Compound turbo TDI.

      There's actually a REALLY neat wheel/tire combo size calculator on that site
      Quote, originally posted by Mr. Rabboto »
      You punched a girl and didn't knock her out? Puss.

    20. Member DarkSideGTI's Avatar
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      Bagged R32T
      07-29-2012 12:42 AM #45
      Quote Originally Posted by Levi20AE View Post
      link to a build thread? looks interesting
      http://forums.tdiclub.com/showthread.php?t=353217

    21. Member
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      01 Audi tt225
      07-31-2012 01:03 AM #46
      Quote Originally Posted by DarkSideGTI View Post
      Compound turbo TDI.

      That thing is gorgeous!!! I wish I would have done a shave and wire tuck when I had the motor out. Wouda shouda coulda I guess.

    22. 07-31-2012 02:39 AM #47

    23. Member syncrogti's Avatar
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      08-07-2012 01:29 PM #48
      I noticed there are some delays caused by a "JC" who's working on the car, based on your other build thread for this same project. What's left to do on this?

      http://forums.vwvortex.com/showthrea...2#post78491692
      Quote Originally Posted by Pineapplegti ! View Post
      100 mph are you serious ???

    24. Member CISinjected's Avatar
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      08-07-2012 06:01 PM #49
      Good point. Nothing takes 4 weeks, let alone 6 months. Even if there was over a months worth of parts delays...seems pretty whack.

    25. Member syncrogti's Avatar
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      87 16vscirocco, 90 ABA callaway equipped golf
      08-07-2012 07:45 PM #50
      Quote Originally Posted by CISinjected View Post
      Good point. Nothing takes 4 weeks, let alone 6 months. Even if there was over a months worth of parts delays...seems pretty whack.
      The OP claims it was caused by this JC in his/her other thread.

      MY question is "what is left to do on this?"

      And if you look in my back yard, its full of unfinished projects.
      Quote Originally Posted by Pineapplegti ! View Post
      100 mph are you serious ???

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