Decided to fit the Top Gear X pipe cats. Need to reduce DB!!

[HSC911]

Superb work, really impressed with attention to detail and workmanship. :worship:

:agree:

:thumb:

 

[Phil 997]

First road test was at 8pm last night so with mechanical empathy, I was just running everything up to temperature, resetting steering angle sensors etc. Stopping at every service station for a quick check etc. Always a bit of burning off of oils, joint sealant etc. It can be quite smoky but wasn't too bad. Got followed by the Police for a mile. I thought I was going to get a pull but didn't.

So. No real performance runs yet. What I did notice is a sweet spot at about 2500 rpm where the sound just peaks with a buzz. Just lovely.

On my second service station stop I connected my temporary vacuum system to operated the 2 gundo valves for the first time. Both worked perfectly. And nice that they are just visible from under the bumper. Oh wow. Even at idle, it was transformed. I set off down the A1 towards home. Under the M25 flyover, I couldn't resist an idiot blip. Really really nice sound. Not as viscous as the system I've just removed, but really deep and just perfect for how I wanted it to be.

All in all, I couldn't be happier.

The quiet mode will be a blessing on our long Euro trips we hope to enjoy in the coming years and hopefully will pass the track day DB tests with ease. (Although the X pipe possibly makes it louder than stock. I've never driven a stock 996 or 997).

The idiot mode will be great for Ace Cafe meets & tunnel hunting with my 13 year old lad.

All I need to do now is figure out how to activate the valves via the GT3 (spoiler button delete) switch pack I installed recently. I already use the suspension & TC off buttons but I have pre-wired the redundant sport button for this very purpose. (My car is non sport). I truly hope I can work out how to use the spare sport signal to operate a relay & then the solenoid to make the exhaust mode operation appear to be factory fitted. Things like that give me a buzz.

DucatirRob, myself and others have used the OEM PSE switch panel via a latching relay (rather than via the ECU) to control the vacuum solenoid as described in detail here....http://911uk.com/viewtopic.php?t=116327&highlight=systech1.

Works very well and remembers the last setting as a bonus

Ah perfect that was the thread I was looking for to post up , I knew some had done it :thumb:

 

[C11BRA]

Thanks guys.

Ok. After a bit of head scratching (thanks to pins 12 & 13 on the switch pack being reversed vs the Porsche wiring diagram) I finally worked out the wiring and with a bypass on the circuit board, I finally got the Sport switch to activate the exhaust valves (GT3 style....kinda).

Road testing tomorrow.

 

[C11BRA]

With valves closed I did a DB test today. Approx 1 metre from the exhaust at 45 degrees.

https://youtu.be/YtSdVreclQE

Maxed out early at 102db. Very happy with that. Hopefully enough to pass 103/105 DB track day tests.

However, in Gundo 2" idiot mode. Well........

https://youtu.be/Pb8cbKhr0n8

Sounds incredible!!!!!

 

[NickHappy]

With valves closed I did a DB test today. Approx 1 metre from the exhaust at 45 degrees.

https://youtu.be/YtSdVreclQE

Maxed out early at 102db. Very happy with that. Hopefully enough to pass 103/105 DB track day tests.

However, in Gundo 2" idiot mode. Well........

https://youtu.be/Pb8cbKhr0n8

Sounds incredible!!!!!

Ooohhh - that sounds nice. Pleased with the quality of TopGear??

 

[C11BRA]

With valves closed I did a DB test today. Approx 1 metre from the exhaust at 45 degrees.

https://youtu.be/YtSdVreclQE

Maxed out early at 102db. Very happy with that. Hopefully enough to pass 103/105 DB track day tests.

However, in Gundo 2" idiot mode. Well........

https://youtu.be/Pb8cbKhr0n8

Sounds incredible!!!!!

Ooohhh - that sounds nice. Pleased with the quality of TopGear??

Yes. Good value & quality was fantastic. Would highly recommend.

 

[C11BRA]

Final post on this thread will be when I tweak the pipe outlets with a couple of new joints. These will allow me to remove the tailpipes for occasional polishing.

Thanks for all your comments & kind words throughout this thread. I hope to meet some of you at meets & events. You'll hear us coming (unless I'm in stealth mode!! :grin: )

 

[C11BRA]

Now the exhaust has settled, the time has come to fit the final joiners.













Ahhhh. Much better.

Here we come Spa. Please don't snow.

 

[C11BRA]

And after all that......Spa was cancelled.

For the right reasons though.

At least it pushed me to get it done. And I'm over the moon with the results.

Spa re-scheduled. Hotel refunded. Eurotunnel re-bookable FOC until Feb 2021.

 

[C11BRA]

Just re-booked Spa for March 2021. No idea if it will happen. 🤷🏼"â™‚️

 

[C11BRA]

We postponed Spa. For 2022? Who knows?

Did Goodwood twice in December & trying out Bedford in April.

Still manage to get a 105 sticker at Goodwood. Found a sticky gundo valve. Will need to sort that out before Bedford. Oh, and my brakes. 😂