EM TuningChris Nott
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  1. #1
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    Boost leak...help required...!

    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...

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  3. #2
    MJCAUDI's Avatar
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    Smile

    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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    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.

  5. #4
    MJCAUDI's Avatar
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    Heres a link to the spring kit , I have APR map and am using the yellow spring (15-23 PSI).

    Heres the link:

    http://www.forgemotorsport.co.uk/con...roduct=FMDVTUN

    also the Valve Diaphragm in the valve can also split, heres the link for the replacement:

    http://www.forgemotorsport.co.uk/con...roduct=FMND109


    check these are the right ones for your valve.

    Let us all know the cause when you find it, good luck!

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    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

  7. #6
    MJCAUDI's Avatar
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    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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