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Boost leak...help required...!

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by prel2000, Feb 23, 2007.

  1. prel2000
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    prel2000 Member

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    [Feb 23, 2007]
    Any ideas what could be causing a boost leak in my A4 1.8T (2002). The car just deosnt seem to pull fast enough when foot is down in about 4000-5000 revs.

    I drove a mates 1.8T the other day and there seemed to be constant power at that rev range and he's isnt remapped either.

    Thanks to all in advance...:icon_thumright:
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  3. MJCAUDI
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    MJCAUDI Member

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    [Feb 23, 2007]
    I had this and found my Diaphragm in the diverter valve was split. Replaced with a forge Closed Loop Diverter Valve with higher spring pressure (because of remap) and was much better.
    Good luck
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  4. prel2000
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    prel2000 Member

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    [Feb 24, 2007]
    Thanks for the reply.....
    My car has also been remapped and I am also using the forge diverter valve. When you say higher spring pressure, is this a modification to the valve itself or is it how the valve comes as standard? as mine was just fitted as standard out of the box.
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  5. MJCAUDI
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    MJCAUDI Member

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    [Feb 24, 2007]
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  6. prel2000
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    prel2000 Member

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    [Feb 25, 2007]
    Thanks again for the reply MJC.

    How did you determine which spring to go for? Mine has a star performance remap, i was quoted gain figures from 150bhp to 200 - 205 bhp. Which colour spring do you think I should go for?

    Cheers:thumbsup:
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  7. MJCAUDI
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    MJCAUDI Member

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    [Feb 26, 2007]
    I would check the Diaphragm is not split first , then replace with the lowest rated spring ( Green one ) and see how it feels. If you feel its still lagging a little put the yellow one in. You just have to experiment a little, you dont won't the spring to be so strong so it does not release the pressure either.

    Hope this helps
    Cheers
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