Post Your Daily Encounter Pics Here

Nasher · 26 Dec 2018 at 20:55

Joe T said:
Why two silencers?

Some exhausts are like that, instead of having a large back box. E.g. like this https://www.fensport.co.uk/assets/Uploads/32016-AT023-1.jpg

Joe T · 26 Dec 2018 at 20:56

Nasher said:
Some exhausts are like that, instead of having a large back box.

But why?

Frozennova · 26 Dec 2018 at 21:04

Joe T said:
I had an Insignia 1.6T petrol which when you looked underneath had a proper dual system including two silencers, but no visible tailpipes at all. Therefore there must have been a good engineering reason.

Sometimes its best not to just make stuff up.

I'd imagine it has a rather large 4" or 5" cat right after the turbo then splits into a dual 1.5-1.75" exhaust to aid flow while keeping noise down.

Joe T · 26 Dec 2018 at 21:07

Frozennova said:
I'd imagine it has a rather large 4" or 5" cat right after the turbo then splits into a dual 1.5-1.75" exhaust to aid flow while keeping noise down.

Sounds quite plausible.

It was certainly a surprising thing to see - a real engineering reason for a dual system, which the marketeers didnt want to take advantage of.

layte · 26 Dec 2018 at 22:03

A terrible picture of the underneath of my Golf R. One pipe, 4 exhausts for a 2.0 4-banger.

Diddums · 26 Dec 2018 at 22:10

Hatchbacks with quads are stupid. Quads belong on supercars and nothing else.

Nasher · 26 Dec 2018 at 22:19

The outer pipes are pretty much fake and don't really do anything.

layte · 26 Dec 2018 at 22:42

Nasher said:
The outer pipes are pretty much fake and don't really do anything.

Well apart from not being fake, and working exactly as the inner pipes depending on engine mode you are spot on. Seems a lot of effort for a couple of fake pipes. http://www.vdubnews.com/volkswagen-works-akrapovic-golf-r-exhaust

Jonnycoupe · 26 Dec 2018 at 22:44

Nasher said:
The outer pipes are pretty much fake and don't really do anything.

Do you have any New Years resolutions yet?

Firestar_3x · 26 Dec 2018 at 23:51

Jonnycoupe said:
Do you have any New Years resolutions yet?

I don't think posting the truth will come high up his list.

IAmATeaf · 27 Dec 2018 at 09:49

Nasher said:
The outer pipes are pretty much fake and don't really do anything.

If you’ve been anywhere near one you’d realise that they are all plumbed in. Have to agree with the other comments though, does it really need quad pipes?

Frozennova · 27 Dec 2018 at 10:18

IAmATeaf said:
If you’ve been anywhere near one you’d realise that they are all plumbed in. Have to agree with the other comments though, does it really need quad pipes?

Probably find if you cut the silencer open that when in sport/race mode and the flaps open on the second set of tips the exhaust gases flow through a less silenced chamber

snips86x · 27 Dec 2018 at 10:29

Nasher said:
The outer pipes are pretty much fake and don't really do anything.

layte said:
Well apart from not being fake, and working exactly as the inner pipes depending on engine mode you are spot on. Seems a lot of effort for a couple of fake pipes. http://www.vdubnews.com/volkswagen-works-akrapovic-golf-r-exhaust

HAHA!! I was going to say exactly the same lol.

On most with the quad exit, the left hand set are on a vac actuator and will only open if you boot it. 90% of the time for normal driving, the right hand exits are the main ones. They're not fake in the slightest ROFL

Nasher · 27 Dec 2018 at 11:32

So they convert more engine power in to extra noise when they open. They have no real mechanical purpose (such as reducing back pressure) and it's just a valve with a motor on it connected to the button, so fake

Joe T · 27 Dec 2018 at 13:08

Nasher said:
So they convert more engine power in to extra noise when they open. They have no real mechanical purpose (such as reducing back pressure) and it's just a valve with a motor on it connected to the button, so fake

No.

theone8181 · 27 Dec 2018 at 19:40

Proper supercar exhaust, split flow but only a single pipe either side (I'm assuming quads are single pipe on each side as well, there's a choice of either single or twin on either side).IMGhttps://cdn.shopify.com/s/files/1/0093/4292/products/PERP9634KITX-PERP9634KITXFLAP_1400x.png?v=1512918180

** Do Not hotlink images **

Diddums · 27 Dec 2018 at 20:23

I've noticed over the last year that the butterfly valves in many quads are visible in the exhaust tips, is there a reason for this? My only thought is ease of access

Kenai · 27 Dec 2018 at 20:33

Nasher said:
So they convert more engine power in to extra noise when they open. They have no real mechanical purpose (such as reducing back pressure) and it's just a valve with a motor on it connected to the button, so fake

Sometimes it's better to just stop digging.

Nasher · 27 Dec 2018 at 20:37

Kenai said:
Sometimes it's better to just stop digging.

Prove me wrong then. Lets see dyno readings with them open vs closed