Comments for AussieDan

Comment on RS4 Exhaust Flap Control by Anand

Anand — Tue, 23 Jun 2020 17:04:58 +0000

Hi Dan –
Brilliant write up — very grateful for this information and for the time you took to publish it!

carstyle4u doesn’t seem to be selling the aforementioned switch any longer — any idea of who else might sell the appropriate switch? I though it better to ask you than do it by trial and error!

Warmly,
Anand

Comment on RS4 Exhaust Flap Control by Dan

Dan — Thu, 15 Aug 2019 13:24:11 +0000

In reply to Mark Heares. Mark, thanks for the kind words. This is indeed the B7 RS4 and the battery is in the boot/trunk.

Comment on RS4 Exhaust Flap Control by Mark Heares

Mark Heares — Thu, 15 Aug 2019 07:33:45 +0000

Hi Dan,

This is an excellent article, well written and with a comprehensive set of instructions. I am also looking for the same switch and would be interested in any future (hopefully short term) builds.
Is this the RS4 B7 – as the battery is normally in the boot (truck in the US).

Look forward to your response.

Comment on RS4 Exhaust Flap Control by Matt DeVillier

Matt DeVillier — Fri, 02 Feb 2018 07:29:19 +0000

Dan,

Appreciate the info, and would certainly be interested in whatever you come up with, and/or discussing future revisions. If easier, drop me a line at first.last at gmail

-Matt

Comment on RS4 Exhaust Flap Control by Dan

Dan — Thu, 01 Feb 2018 23:01:43 +0000

Hi Matt,

The RS4 switch is aftermarket, it came from carstyle4you.com and included a latching relay to convert the momentary switch into a push-on/push-off switch.

As for visual feedback, I designed and built a more complex circuit to light the RS4 logo at 1/2 brightness while enabled, while retaining the normal illumination function with the headlights on. I sold that one and haven’t gotten around to building another yet, it didn’t have a mode memory but did have a jumper to select the startup mode.

The relay that came with the carstyle4u switch has actually died, so I do intend to build another control module. If you’d be interested I was thinking about making a small batch of them.

The other option that interests me at the moment is to use a small microcontroller like the ESP8266 or ESP32, which would give some more options like connecting to the CAN bus and monitoring throttle position to control the flaps, etc.

Comment on RS4 Exhaust Flap Control by Matt DeVillier

Matt DeVillier — Thu, 01 Feb 2018 22:41:25 +0000

Hi Dan, nice write up here! Do you happen to have the part # for that RS4 switch, I can’t seem to find it with a quick google search. Also, does the switch reset on ignition (like the S button) or maintain state? Any visual indicator/light as to switch state?

cheers!