Page 1 of 3 123 LastLast
Results 1 to 25 of 56
  1. #1
    Join Date
    Jan 2007
    Location
    Derbyshire, UK
    Posts
    3,082
    Mentioned
    2 Post(s)
    Tagged
    1 Thread(s)
    Rides
    0

    Default Alternative turbos?

    Are there any other turbos that bolt straight on to the Q4?

    wrinx
    My Q4 in the Garage

    www.alfaromeo155.co.uk ............................ □□□-V-□□□ .................................. www.ilmostro.co.uk

  2. #2
    Join Date
    Oct 2007
    Location
    Copenhagen, Denmark
    Posts
    139
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    Yes there is!

    The exhaust manifold on the Q4, comes stock with a T3 flange.

    You can take the stock turbu which is a Garret T3 and converted it to a hybrid, where you use the turbine side of the Garret T4.

    Or you can simply change it to the Garret T4 turbo. But then you will get more lag.

    My suggestion is the hybrid. Its good for approx 420 Bhp.

    Another alternative, is too change the exhaustmanifold to a custom build ala the one from Supersprint, but with a T25 flange.

    Then you have all the opportunities in the world with all Garrets ball bearings turbos.
    Regards...

    RMB-Racing
    Ronnie Bonde
    Denmark

  3. #3
    Join Date
    Feb 2007
    Posts
    622
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    Anything with a T3 flange will, although some may need oil feed and exhaust pipe mods.
    The T3 from an integrale 16v/Evo 1 will be a totally direct swap.

    It all depends on how much power/driveability you want........

  4. #4
    Join Date
    Jun 2006
    Location
    London
    Posts
    2,677
    Mentioned
    9 Post(s)
    Tagged
    0 Thread(s)
    Rides
    1

    Default

    Has anyone fitted a GT28 series to a Q4? A lot of Coupe owners do this but some mods are required.

  5. #5
    Join Date
    Apr 2006
    Location
    Bournemouth UK
    Posts
    4,782
    Mentioned
    2 Post(s)
    Tagged
    1 Thread(s)
    Rides
    1

    Default

    When I needed a new turbo, I went for the T3/T4 hybrid with a new Supersprint manifold. Completely changed the turbo response.
    1994 Alfa Romeo 155 Q4: Dozeing in the garage.
    2009 Audi A4 tdi: Everyday drive.
    1994 Alfa Romeo 155 , 1995cc Std Standard Black

  6. #6
    Join Date
    Jan 2007
    Location
    Derbyshire, UK
    Posts
    3,082
    Mentioned
    2 Post(s)
    Tagged
    1 Thread(s)
    Rides
    0

    Default

    It's a T3/4 I'm thinking of, the GT28 looks like a really expensive conversion from what I've read.

    wrinx
    My Q4 in the Garage

    www.alfaromeo155.co.uk ............................ □□□-V-□□□ .................................. www.ilmostro.co.uk

  7. #7
    Join Date
    Jun 2006
    Location
    UK
    Posts
    246
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    dont forget to price in a re-map to get the best out of it
    a drive no longer full of alfa`s !!
    Q4
    Sud
    Uno T
    Delta hf T

  8. #8
    Join Date
    Jan 2007
    Location
    Derbyshire, UK
    Posts
    3,082
    Mentioned
    2 Post(s)
    Tagged
    1 Thread(s)
    Rides
    0

    Default

    Good point, I hadn't thought of that

    wrinx
    My Q4 in the Garage

    www.alfaromeo155.co.uk ............................ □□□-V-□□□ .................................. www.ilmostro.co.uk

  9. #9
    Join Date
    Jun 2006
    Location
    UK
    Posts
    246
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    lol
    i only know cos i spent a few hundreds on a hybrid for one of my uno T`s a long time ago and found it had made no difference at all !!
    but taking it back to the garage which chipped it on std turbo soon sorted it.

    I guess that it would still count for a q4 tho it has a far more sophisticated fueling system, as you will be making more compressed inlet air but not adding any more fuel to burn with it.
    a drive no longer full of alfa`s !!
    Q4
    Sud
    Uno T
    Delta hf T

  10. #10
    Join Date
    Dec 2006
    Location
    halfway to the 'ring
    Posts
    232
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    you would, since the map sensor will tell the engine it's boosting more...

  11. #11
    Join Date
    Oct 2007
    Location
    Copenhagen, Denmark
    Posts
    139
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    Quote Originally Posted by wrinx View Post
    It's a T3/4 I'm thinking of, the GT28 looks like a really expensive conversion from what I've read.

    wrinx
    No more expensive with a T3/4 - if you are changing the exhaust manifold as well.

    The flange on the manifold has to be a T25 flange though.

    Such manifolds can be bought on this site: www.ar-racingshop.de/index.php

    Its in german - sorry!

    If you can find anything, i?ll can get the prober links.

    But my choice will be the T3/4, with another exhaust manifold.
    Regards...

    RMB-Racing
    Ronnie Bonde
    Denmark

  12. #12
    Join Date
    Jun 2006
    Location
    London
    Posts
    2,677
    Mentioned
    9 Post(s)
    Tagged
    0 Thread(s)
    Rides
    1

    Default

    Quote Originally Posted by RMB-Racing View Post
    No more expensive with a T3/4 - if you are changing the exhaust manifold as well.

    The flange on the manifold has to be a T25 flange though.

    Hi RMB, my knowledge of turbos is growing (slowly) but I am confused by the above.

    Wouldn't a GT28, require a T28 flange instead of a T25?

    Have I got this thought out wrong? What is the 25, 28 an actually measurement of?

  13. #13
    Join Date
    Oct 2007
    Location
    Copenhagen, Denmark
    Posts
    139
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    Quote Originally Posted by AlfaJack View Post
    Hi RMB, my knowledge of turbos is growing (slowly) but I am confused by the above.

    Wouldn't a GT28, require a T28 flange instead of a T25?

    Have I got this thought out wrong? What is the 25, 28 an actually measurement of?
    Your right - it can be very confusion - and my knowledge of turbos is growing too every day!

    When we are talking Garret Turbochargers, there are two flanges we are interested in.

    (There are several more - but of no important for us)

    The T3 flange and the T25 flange.

    The T3 is for the Garret T3, T4 and of course the various hybrids we can make of these versions.

    The T25 flange is for all the Garret ball bearings turbos (except the GT40), which opens a bigger world, regarding lots of horsepowers.

    The T25 flange is also used on the TB28, which is the original turbo on the Fiat Coupe 20VT.

    But our problem is, that our stock exhaust manifolds is whit a T3 flange, and therefore is our options limited too the T3 and T4 turbos.

    But www.ar-racingshp.de are selling exhaust manifolds whit T25 flange.

    But bare in mind - bigger turbo - bigger lag!

    The hole idea, is too have a small turbine side of the turbo as possible, and a big compression side of the turbo as possible.
    Last edited by RMB-Racing; 28-12-07 at 17:54.
    Regards...

    RMB-Racing
    Ronnie Bonde
    Denmark

  14. #14
    Join Date
    Jun 2007
    Location
    Romania
    Posts
    665
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    Quote Originally Posted by RMB-Racing View Post
    The hole idea, is too have a small turbine side of the turbo as possible, and a big compression side of the turbo as possible.
    Just like the T3/T4 Hybrid ?
    Alfa Romeo 155 Q4 WB '95
    Alfa Romeo per sempre !

  15. #15
    Join Date
    Jun 2006
    Location
    London
    Posts
    2,677
    Mentioned
    9 Post(s)
    Tagged
    0 Thread(s)
    Rides
    1

    Default

    Thanks RMB, thats clearer now

  16. #16
    Join Date
    Oct 2007
    Location
    Copenhagen, Denmark
    Posts
    139
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    Quote Originally Posted by XTI View Post
    Just like the T3/T4 Hybrid ?
    Exactly!

    And that is the setup I?m personally is going for.

    And then a custom exhaust manifold with a T3 flange.

    My target is about the 400 bhp.

    I could also use a custom exhaust manifold whit a T25 flange, and the fit it with fx. a GT2871RS (Which I have on my 260 bhp Passat).

    But i think the T3/4 Hybrid is almost perfect for our cars. All the connections fits like standard. It doesn't on the ball bearings turbos.
    Regards...

    RMB-Racing
    Ronnie Bonde
    Denmark

  17. #17
    Join Date
    Apr 2006
    Location
    Bournemouth UK
    Posts
    4,782
    Mentioned
    2 Post(s)
    Tagged
    1 Thread(s)
    Rides
    1

    Default

    Quote Originally Posted by RMB-Racing View Post
    But i think the T3/4 Hybrid is almost perfect for our cars. All the connections fits like standard. It doesn't on the ball bearings turbos.
    The only thing that I had to change when I changed to a T3/T4 hybrid was the oil return pipe (the one that runs just behind the radiator fan) it just wasn't long enough to connect up satisfactorily. Apart from that, it all slotted together fine.
    1994 Alfa Romeo 155 Q4: Dozeing in the garage.
    2009 Audi A4 tdi: Everyday drive.
    1994 Alfa Romeo 155 , 1995cc Std Standard Black

  18. #18
    Join Date
    May 2007
    Location
    Australia
    Posts
    963
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    Steve, did the car require any remapping to go with the t3/t4. Did you notice immediate performance improvements?

    JimN~

  19. #19
    Join Date
    Apr 2006
    Location
    Bournemouth UK
    Posts
    4,782
    Mentioned
    2 Post(s)
    Tagged
    1 Thread(s)
    Rides
    1

    Default

    Can't really say how much of a difference the change to a T3/4 hybrid made as the turbo it replaced was on its last legs. Also at the same time I had a new exhaust and supersprint exhaust manifold. So it wasn't really a turbo swap, more of a complete exhaust system upgrade.
    What I can say with all these changes is that the boost comes in much earlier and smoother now, and doesn't fall off until much higher up the rev range.
    The car was remapped, it was already running an Evocars chip (Integrale/Q4 hybrid) but was set up on a rolling road to make sure everything was as it should be.
    1994 Alfa Romeo 155 Q4: Dozeing in the garage.
    2009 Audi A4 tdi: Everyday drive.
    1994 Alfa Romeo 155 , 1995cc Std Standard Black

  20. #20
    Join Date
    Oct 2007
    Location
    Copenhagen, Denmark
    Posts
    139
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    Quote Originally Posted by jimnielsen View Post
    Steve, did the car require any remapping to go with the t3/t4. Did you notice immediate performance improvements?

    JimN~
    I will say that a remapping is a must, every time we are fitting another turbo.

    But it can be a expensive matter, so my advice is to wait until you have made all you changes.
    Regards...

    RMB-Racing
    Ronnie Bonde
    Denmark

  21. #21
    Join Date
    Oct 2007
    Location
    Copenhagen, Denmark
    Posts
    139
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    Quote Originally Posted by Steve Webb View Post
    Can't really say how much of a difference the change to a T3/4 hybrid made as the turbo it replaced was on its last legs. Also at the same time I had a new exhaust and supersprint exhaust manifold. So it wasn't really a turbo swap, more of a complete exhaust system upgrade.
    What I can say with all these changes is that the boost comes in much earlier and smoother now, and doesn't fall off until much higher up the rev range.
    The car was remapped, it was already running an Evocars chip (Integrale/Q4 hybrid) but was set up on a rolling road to make sure everything was as it should be.
    What is the data now then?

    Bhp, tourge, revs etc etc...???
    Regards...

    RMB-Racing
    Ronnie Bonde
    Denmark

  22. #22
    Join Date
    Jun 2007
    Location
    Romania
    Posts
    665
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    I was about to ask Steve the same question. Why am I so curious?

    Because I have one for my Q4...but the reconstruction comes first. I wonder what's expecting me...aiaiaiiiiii
    Attached Images Attached Images
    Alfa Romeo 155 Q4 WB '95
    Alfa Romeo per sempre !

  23. #23
    Join Date
    Oct 2007
    Location
    Copenhagen, Denmark
    Posts
    139
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    Quote Originally Posted by XTI View Post
    I was about to ask Steve the same question. Why am I so curious?

    Because I have one for my Q4...but the reconstruction comes first. I wonder what's expecting me...aiaiaiiiiii
    Why dont you change the exhaust manifold as well???
    Regards...

    RMB-Racing
    Ronnie Bonde
    Denmark

  24. #24
    Join Date
    Jun 2007
    Location
    Romania
    Posts
    665
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    Quote Originally Posted by RMB-Racing View Post
    Why dont you change the exhaust manifold as well???
    I'm thinking to a custom made one or even a Supersprint...

    At the moment I'm prepairing for the rebuilding of my Q4 (if it's the right word) because I've bought it in a not very good condition. I'm sure I will spent a lot of money and time with the project but... "Il cuore ha sempre raggione".

    Cheers,
    Chris
    Alfa Romeo 155 Q4 WB '95
    Alfa Romeo per sempre !

  25. #25
    Join Date
    Oct 2006
    Location
    Trondheim, Norway
    Posts
    138
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    if you change to the t3/t4 hybrid, what about stronger bolts and compression, will all this be ok?

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •