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Big Turbo Alternative

Discussion in 'A3/S3 Forum (8L Chassis)' started by StephenBogan, Apr 29, 2004.

  1. StephenBogan
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    StephenBogan Member

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    Everyone knows about the 'Big turbo' upgrades? The upgrade that costs around £3500 ~ £4500 depending on who does it. In this kit there is a bigger turbo, different manifold and down pipe/s to suit the new turbo amoungst other parts. To bring the cost down dramatically could you not just have the origial K04 turned into a hybrid? This would save the forementioned parts whilst a larger compressor wheel would provide that all important boost above 5250rpm, where as some folks have pointed out, is as flat as a fart with the standard turbo under high boost conditions (chipped). I know larger injectors would still have to be used and a re-map would still have to be done, but surley this would be a much cheaper alternative? /ubbthreads/images/graemlins/idea.gif

    Any thoughts would be much apprecaited. /ubbthreads/images/graemlins/grin.gif
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  2. dunk
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    dunk Member

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    there is a problem with the k04 turbine - the exhaust turbine is too small to drive a significantly larger compressor, and there are no plugin upgrades not involving the same manifold changes etc.

    undoubtedly you will get some improvements by using a slightly larger compressor wheel, but you wont get the same effects as using a completely different turbo.

    most of the other turbo makes have larger compressor wheels that can provide the compressing power without a massive hike in lag - the best of the lot is probably the ihi roller bearing turbos - there are a myriad variations that allow a good match between low rev spin-up, very low lag but fantastic boost.

    these turbos are used in the subaru to provide similar 300-350bhp from a 2l form - they match the 1.8 very well.

    the gt28r based turbos have potentially more boost but do tend to have more lag and come in higher up the revs range.

    if you were replacing a bust k04, i would think about having a hybrid built, but if you want serious upgrade power then an ihi based conversion is the way to go.
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  3. StephenBogan
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    StephenBogan Member

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    Hello? Is there anyone out there?
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  4. wigginer
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    wigginer Member

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    Only us Mice ...
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  5. cyuen
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    cyuen Member

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    actually i want to give the IHI conversion a try... not TOO pricey compare to sportec
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  6. RichA3Turbo
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    RichA3Turbo ...Watching you! Staff Member Moderator

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    [ QUOTE ]
    cyuen said:
    actually i want to give the IHI conversion a try... not TOO pricey compare to sportec

    [/ QUOTE ]

    Same as me. Cos i have the old engine, most places dont do conversion for thi, so the cost of a big turbo upgrade would be £6k for a new engine, then the turbo upgrade on top of that. If i go with Jabba, i will get 300bhp for £2800. On top of that i would upgrade the clutch, intercooler, sports cat and i would also get racelogic to manage the power.... hopefully wont be long! /ubbthreads/images/graemlins/grin.gif /ubbthreads/images/graemlins/groovy.gif

    Rich
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  7. cyuen
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    cyuen Member

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    hhm it seems AmD have dropped the 350hp/350lb kit at the moment, the only option is the pocket hurting, Sportec kit
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  8. PaulRS3
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    PaulRS3 Active Member

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    horrendous cost for those conversions, into the ££,£££ territory and i was told that included sending the whole car to sportec abroad to do that kind of work...

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  9. StephenBogan
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    StephenBogan Member

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    So it looks like there isn't any point in getting the standard turbo enlarged to retain more original parts = less cost?
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