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Author Topic: Exhaust Valve Bypass  (Read 156 times)

Offline Jeremy

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Exhaust Valve Bypass
« on: July 29, 2020, 12:39:05 pm »
Dear all,

I have a 2019 Abarth competitizione, I've read that they changed the valve opening system on the 2019 model and onwards. When in sport mode the valves open around 3000 rpm in 2nd gear and around 2800 rpm in 3rd gear. Does anyone have a solution that could make the valve open before a certain amount of rpm with the new exhaust system?

Kind regards,
 
Jeremy

AbarthForum.co.uk

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    Offline 124Abarthreplica

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    Re: Exhaust Valve Bypass
    « Reply #1 on: July 29, 2020, 01:56:31 pm »
    Welcome to the forum Jeremy :thumb:

    Which ever Monza silencer you have, pre 2019 with angled cut tips and spring controlled flap or post 2019 with straight cut tips and ECU controlled flap, you can keep the flap open permanently with a length of wire.

    To adjust the earlier spring controlled flap to open sooner, fit a weaker spring.

    The Ecu will have to be reprogrammed for the later version although pressing the 'sport' button opens the valve manually.

    Offline Jeremy

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    Re: Exhaust Valve Bypass
    « Reply #2 on: July 29, 2020, 03:08:10 pm »
    Hello Thanks for the welcoming :)

    Indeed I have the straight cut tips and ecu controlled flap. So if I understood correctly the only way to keep the flap open permanently would be to reprogram the ecu? Or is there another alternative?

    Thanks

    Offline 124Abarthreplica

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    Re: Exhaust Valve Bypass
    « Reply #3 on: July 29, 2020, 03:12:12 pm »
    Wire it open :thumb:

    Offline Jeremy

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    Re: Exhaust Valve Bypass
    « Reply #4 on: July 29, 2020, 05:16:04 pm »
    I just tried wiring it open with zip ties however the valve is just jumping around inside the pipe so I had to take it off :(

    Offline Badcav203

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    Re: Exhaust Valve Bypass
    « Reply #5 on: July 30, 2020, 10:11:20 am »
    I just tried wiring it open with zip ties however the valve is just jumping around inside the pipe so I had to take it off :(

    You can unplug the vacuum valve under the bonnet and it achieves the same result.

    The valve is attached to the firewall, at the back of the engine bay, top right of the red airfilter box if you are looking at the car from the front.
    Spring clip, push in and pull electrical connector.


    Offline 124Abarthreplica

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    Re: Exhaust Valve Bypass
    « Reply #6 on: July 30, 2020, 01:44:12 pm »
    I've got a brand new spare Ecu controlled Monza and the valve appears to open in the rest position.

    So either just remove the flexible connection to the Monza or as Badcav203 suggests above. :thumb:

    Offline Jeremy

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    Re: Exhaust Valve Bypass
    « Reply #7 on: July 30, 2020, 02:37:10 pm »
    Thanks Badcav203!!  This worked out for me, valve is open all the time now