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Just picked up my '04 C4S. Recall a discussion here some time ago (but cannot find it) about the cutout between 3500-4500rpms. Would like info on how to keep it on throughout the band, with the option to use the onboard switch as factory on/off if needed.


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Word of caution...

I did this hack on my 2001 C4 after fitting the PSE and noticed that the Sat Nav and trip computer stopped responding. After having my local dealer look into it for me they traced it back to the jumper that I removed when doing the hack as it sends the speed signal to the Sat Nav and computer as well as the electronics controlling the exhaust valve.

You might find that if you do this hack you may have a problem with the nav system.


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Interesting, did you go back to installing the jumper ? The Nav is very accurate, i just returned from Zurich, when i hit the road at 6PM the nav told me ETA 00:55 . I arrived at 00:00 , ( 750 km ) but could do + 200 km/h on german highways... the nav recalculates each time, and estimated at the end 00:10 . Quite accurate on a 6 hour drive ... . I sure do not want to loose this "feature" .

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I have not put the jumper back in although I have left that relay easily accessable should I want to. Sat Nav is not a problem as I also have a handheld system that covers the UK and Europe.

I will test this out next week when we travel to Spa and the Ring for a long weekend of fun with 6 other cars :-)


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