TT RS Exhaust Flap mod, Switched - & Other Things

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Trev
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Re: TT RS Exhaust Flap mod, Switched.

Post by Trev » Sat Jun 08, 2013 9:54 pm

Don't rob your own bank just ask for some of your millions you've hidden away ;)
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brittan
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Re: TT RS Exhaust Flap mod, Switched - & Other Things

Post by brittan » Mon Jun 10, 2013 12:18 pm

Well the switch mod didn't work out exactly as hoped. Each time I operate the switch an 'open circuit' fault is logged for the solenoid valve. There are some alternative work-arounds but I may just go back to the simplest mod and disconnect/blank the vacuum tube to the actuator.

By coincidence the EML came on yesterday too. VCDS scan showed 1 incidence of implausible signal from the exhaust gas temperature sensor. I've deleted the fault codes, the light is out and following a 40 mile drive this morning and a number of engine starts it hasn't come back.
At over £200 for a new sensor I'll wait and see what happens rather than buy a sensor in readiness. Apart from that it looks like one of those jobs you pay someone else to skin their knuckles on.
TT RS Ara Blue with black interior, 19" wheels and some other toys.

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Re: TT RS Exhaust Flap mod, Switched - & Other Things

Post by brittan » Mon Jun 10, 2013 12:21 pm

I've done a bit of interior decorating though:

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TT RS Ara Blue with black interior, 19" wheels and some other toys.

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Re: TT RS Exhaust Flap mod, Switched - & Other Things

Post by Trev » Wed Jun 12, 2013 7:29 pm

Looking good :thumbsup:
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Re: TT RS Exhaust Flap mod, Switched - & Other Things

Post by dzTT » Thu Jun 13, 2013 7:25 am

The little blue touches look really nice :thumbsup:
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Re: TT RS Exhaust Flap mod, Switched - & Other Things

Post by brittan » Fri Jun 14, 2013 6:37 pm

I'm not one to give up easily so, from a number of alternatives, I decided on a different way to achieve the original aim to have switched operation of the exhaust flap. I removed the switch from the OEM wire to the OEM solenoid valve and fitted an extra solenoid valve in the vacuum hose between the OEM solenoid valve and the exhaust flap actuator.

Initially I had wanted to replace the bank of switches on the centre console with one that included the TPMS switch and the switch for the moveable spoiler. It proved difficult to identify the right part number and ordering one from the local dealer would have been on the basis that it was non-returnable, so potentially an expensive mistake. Apart(pun) from that only the earlier RSs had the TPMS button, later ones had that function incorporated in the DIS so the right set of switches would be rare.
Hence I defaulted to fitting the press button under the steering column where it is easy to reach but out of sight.

This is a diagram of the arrangement:
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Both solenoids operate in the same way.
De-energised they shut the vent connection and connect inlet to outlet allowing vacuum to be transferred to the actuator to shut the exhaust flap.
Energised they shut the inlet connection and connect outlet to vent breaking the vacuum on the downstream side and opening the exhaust flap.

The OEM solenoid remains under OEM control by the ECU and Sport button.
The extra solenoid valve allows me to effectively override the OEM one and open the flap any time I like.
Overriding shut the flap is not possible with this arrangement.

I used a press button (momentary contact) switch to mimic the operation of the OEM switches so that meant I had to incorporate a latching relay in the supply to the new solenoid valve.

It's all fitted and working exactly as expected and with no fault codes being logged. :)
TT RS Ara Blue with black interior, 19" wheels and some other toys.

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Re: TT RS Exhaust Flap mod, Switched - & Other Things

Post by Trev » Wed Jun 19, 2013 5:17 pm

Is it still working ;)
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Re: TT RS Exhaust Flap mod, Switched - & Other Things

Post by brittan » Thu Jun 20, 2013 4:55 pm

Amazingly Trev, my lash up still functions! :D

It's currently undergoing wet weather testing since I've evicted the TT from its home while I give that home an interior make-over.
TT RS Ara Blue with black interior, 19" wheels and some other toys.

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Re: TT RS Exhaust Flap mod, Switched - & Other Things

Post by Trev » Thu Jun 20, 2013 5:05 pm

brittan wrote:Amazingly Trev, my lash up still functions! :D

It's currently undergoing wet weather testing since I've evicted the TT from its home while I give that home an interior make-over.


Good news Brian :thumbsup: wet weather :o it's roasting up here for a change 8)

What's the interior make over ? Hydraulic lift perhaps rolling road ?
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Re: TT RS Exhaust Flap mod, Switched - & Other Things

Post by brittan » Thu Jun 20, 2013 5:41 pm

Nothing so fancy Trev.

Some wiring changes, replacement of 6 of the fluorescent lights, roof insulation, compressor maintenance, some pipework mods, a bit of painting and maybe a new front door.
TT RS Ara Blue with black interior, 19" wheels and some other toys.

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