It’s annoying, anti social and probably illegal.

But when I did it to my car 30 years ago it was very cool 😁😎 and it definitely made me irresistible to the ladies.

Probably…

I (used to before Covid) help service an Escort Cosworth Rally car that had an anti-lag system to help the car accelerate quicker after decelerating. It does this by pumping extra fuel in during deceleration. If you don’t then accelerate, the fuel goes in to the exhaust and detonates because of the heat (ie bang/pop/flames)

We are/were rarely allowed to run it on a rally though, because it broke the noise test limit.

Not sure why a 1L Corsa (or similar) needs to do it though 😉

As to the rear bike rack on a car letting exhaust gasses melt things on the back… yup! Melted bike tyres that way… ended up putting kitchen foil on the parts near the exhaust to stop it happening after the first two times

I’m all in favour of it if the driver is under 25, because in all honesty that generation has sod all to look forward to: unaffordable housing, job insecurity and climate change that is only going to accelerate and bring in horrific inequality and conflict. If having a crap car that pops and bangs offers some sort of solace then more power them. If you’re over, say, 35 max and have an premium car that is programmed to pop and bang then I’d say get a life.

F1 cars in the DFV era used to do it (and before, one assumes) – I always just thought lavish fuelling and aggressive cams. But the modern faux interpretation is… Just sad.

… not far removed from Rednecks and their obsession with ‘rolling coal’

“No smoke, no poke”, as one scrub said to me from the passenger side of his best friend’s ride one day.

Il keep my s13 and its flaming screamer pipe in the garage then…

Is that where the wastegate dumps straight to atmosphere, rather than the exhaust?
Does it not sound horrible? When mine broke it sounded like utterly awful every time it opened.

Il keep my s13 and its flaming screamer pipe in the garage then…

To be honest, screamer pipes sound SICK

(jamesoz look up ‘skyline screamer’)

But the pops and bangs – bellend / loser. Especially on modern cars – genuinely couldn’t think of anything more sad than a german marquee doing those silly noises

Eurgh my 21 year old neighbor has a golf R that I can hear rumbling away from anywhere in the house or garden. Revving its tits off on the street. Though I think he saves the pops and bangs for when he’s flooring it between the speed bumps. He told me it’s a poser’s car.

rOcKeTdOg
Full Member
how do they get throuh an mot? its over fueling and decatted, or the cat is dead, so wouldnt the emissions pick that up?

According to my 19 year old colleague with his decat BMW with stretched tyres on over size rims the lack of cat doesn’t stop it passing the emissions.

His insurance is 1.5k a year though

He’s either got a really friendly tester or is 19 and hasn’t had his car through an mot yet.
May pass emissions but the lack of visible cat is a fail unless the car is pre 92.

Most people either refit the cat at MOT time or get a dummy cat (insides gutted)

Also, driving with no cat voids your insurance because your car is not roadworthy and illegal. That’s a lot of young men who are essentially uninsured.

I personally despise motorbikers. The number of bellends that fit a loud exhuast and then ride around with f00cking earplugs in under bloody helmet. Full throttle through a 30mph village, but back off just a little before gunning it up the hill at all hours of the frikin night. Copper Nanotubes the lot of them.

Waste gates do have a benefit at least, let a big turbo stall the compressor and it doesn’t like it, do it every gear change and it won’t thank you.

Pops and crackles to fake some high performance engine, oh.

Mine does it but only if I put it in sport mode and have a heavy right foot. It does make me smile though, especially in tunnels through the alps when there are 4 bikes on the back. People don’t expect a loaded family car to make that type of noise. In normal driving it sounds like any other car although a bit louder on start up.

@jamesoz @flannol … Just exhausts straight out of a small cut of pipework banded onto the turbo. 3 foot flames out of the bonnet. Would like to add its not a road legal car and i am not part of the local ASBO crew. Its primarily a show car with easily tunable suspension for drag runs or drifting. However in my younger days, i am fully guilty of removing cats and changing cams, and ‘living the dream’

Also, driving with no cat voids your insurance because your car is not roadworthy and illegal. That’s a lot of young men who are essentially uninsured.

Thankfully the insurance is still valid, they may struggle to claim on it but third party liability still stands.

If you’re really after an exhaust to moan about, just google ‘Bososoku exhaust’

Waste gates do have a benefit at least, let a big turbo stall the compressor and it doesn’t like it, do it every gear change and it won’t thank you.

The waste gate controls the level of boost. It opens when the desired pressure is reached, so the exhaust gasses bypass or partially bypass the hot side of the turbo. If it stayed shut the engine will over boost and shut down or break something.

The dump valve or recirculating valve is on the cold side and dumps boost pressure when the throttle closes, the ones you can hear either dump boost pressure to atmosphere or feed the air back into the intake close enough to the airbox to be audible.

These aren’t boy racer things (except the dump valve to atmosphere) all turbocharged cars have them, which now is now most ICE vehicles.

I never got into the whole car modification thing. Other than upgrading the stereo and speakers. At 17 a few mates had lowered or upgraded exhausts and I use to think my car was better because it was quieter.

My motorbike does it when you close the throttle, something to do with a secondary air injection system that puts a bit of air into the exhaust gases to make them burn and improve emissions (I think) at low revs.

Oops yes, I meant the dump valve

spooky_b329
Full Member

along with bodykits and dump valves

OK so, guilty as charged… Mine came with a fully adjustable internal/external dump valve, meaning I can have it basically silent and redirecting the excess gas back to the intake (which is better for performance, as it’s all air that’s already been metered and fuelled-for). Or, I can have it in external mode and vent to atmosphere, making The Noise.

I told myself I would always have it on the obviously superior internal return mode. It is on the chav PSSSH mode and I love it.

Sorry.

I always love a good pssssssh on a nice turbo. I also love the ‘DSG fart’ on the VAG’s. The wifes old Ibiza Boccanegra auto used to do it and it sounded great

I used to chuckle at the noise my completely standard company astravan used to make. Sounded like Zoidberg from Futurama. No popping/banging, being a diesel though.

Our neighbour’s kid has an A3 with a decat, no mid box and pops and bangs map. Sounds like it’s got 700bhp. It’s got 120.

Meanwhile, my EcoSport ST-Line has a 1.0 three-cylinder engine that puts out 125bhp. And doesn’t pop and bang. Eventually, it’ll get a remap to 156bhp. And still won’t pop and bang. I’d love the kit fitted that includes a better turbo, cold-air induction and a tuned exhaust, that would take it over 200bhp; but then there’s the additional work to brakes, shocks and springs, and stiffer anti-roll bars to bring it up to match the power, so not a viable option without a lottery grant… 🤪

I personally despise motorbikers. The number of bellends that fit a loud exhuast and then ride around with f00cking earplugs in under bloody helmet.

No, the earplugs are to stop hearing damage caused by continuous loud wind noise around the helmet – motorbike helmets don’t block noise.

Noise levels under motorcycle helmets can be very high. Above about 65 km/h or 40 mph the wind noise generated by the airflow over a motorcycle and rider exceeds the noise from the motorcycle itself. Daily noise exposures of working motorcyclists without hearing protection may regularly exceed 90 dB(A).

https://www.isvr.co.uk/workplace/motorcycle-noise.htm

Boy racer fantasy to sound like a racing car. A side pipe with big flames gets you bonus points.

For all of you old gits moaning and frothing at the mouth about this silly little distraction, how about you just sit back in your comfortable pensions, or your overpaid jobs, and your massive house equity and your stable little lives and just suck it up. Our youngsters have been landed with a fkd climate, a ruined NHS, a lifetime of debt and a bloody global pandemic, how about cutting them some slack. FWIW, I’d much rather have my ears assaulted by silly little petrol hatchbacks than my lungs ruined by shitbox German diesel estate cars and 4x4s accelerating past me belching black unburnt shite everywhere.

I’m a 39 y/o man child who still loves modified cars and brum brum noises, however modern DSG farts/TFSI crackles & pops ect usually sound **** IMO

That said I’ve no room to talk have a stainless system on my TDI van which would also horrify most of you haha

Mate of mine used to have and Impreza rally car, the exhaust was the biggest I’ve ever seen. It’s sounded great on the turbo over run

This is pops and bangs done right, and it truly enhances the experience. There’s also a button too to turn it off.

A few years ago I enjoyed knocking about on a 1949 MAtchless 350. The bike didn’t have anything as fancy as automatic ignition timing, it was up to the rider to control it with a lever on the bars.
I really enjoyed the crackle and bang when coasting downhill and turning the lever to retard.
When I hear a pop n bang car passing now, it will be forever associated in my mind with ‘going full retard’. Seems apt.

I find them pretty irritating, but I need to appreciate thet 19 year old me would have LOVED it.

That R8 sounds lovely but I’d not want it driving past my house at 6am every morning thank you.

A ex-boss of mine had a F type that was so loud it had a “quiet mode” button fitted as standard, thing is, each time you started it, it would start in loud, and then you could press the quiet button, so it would still wake the neighbours no matter how quickly you tried to quieten things down.

He sold it after 6 months

I used to have a KTM Duke2 with G-Force cans on it & had been rolling roaded, when it popped it had the ability to set of car alarms which I found hugely satisfying.

The dump valve or recirculating valve is on the cold side and dumps boost pressure when the throttle closes,

The recirculating valve does more than that. It’s not used for boost regulation, that’s what the wastegate does but without a recirculating valve when you come off throttle and boost drops off instantaneously the pressure in the exhaust manifold ‘surges’ back to the turbo and stops the turbo spinning increasing lag and pick up for the next gear. So the recirculating valve takes high pressure inlet manifold air and uses that to balance out the pressure wave and keep the turbo spinning to reduce lag.

There is an annoying idiot with tone of these silly mods on their diesel seat. The issue is it’s very loud and let’s off lots of loud bangs for a reasonable length of time. So it’s not a few pops but a sustained series of very loud bangs. So nothing like new cars that do this that are actually pretty quiet. No issue with people doing it, it’s all fun even if it is detrimental to the performance, efficiency and durability of the car, but all he seems to do is raz around the estate banging as he goes and it is very tedious, upsets pets and late at night or early in the morning is just a nuisance.

The back of the car is all soooted up so the emissions of the car are off, it must be a reversible mod to get through MOT so surely illegal on that basis if nothing else.

My neighbours have an RS3 which sounds like an old tractor, and if it was my £40/50K (?) super=hatch, I’d be embarrassed.

Don’t get me started on this…. my son’s one. Fabia 1.2 TSI 110bhp that’s now a 1.4 TSI running 170 bhp, with a remap that includes pops. You can drive it without popping, and he’s careful enough not to come in popping or banging and keeps it quiet. I know they’ve gone under the Manchester Airport Tunnel popping along !

It’s been an expensive journey for him as the first company that re-mapped the car caused the turbo to disintegrate – poor fueling, which in turn, scattered metal fragments into the engine. Toasted 1.2 engine.

He had to pick up a used engine, and found a 1.4 that was an exact match and fitted it all himself. Whilst at it, fitted a new clutch as the old engine had 100k on it, and had a slight leak from the main seal.

The car is so uncomfortable now as it’s been lowered with adjustable coilovers.

It was a lovely car ‘stock’ – bone shaker now. It’s apparently rather quick now though.

His mates are regularly round ‘fixing’ their cars – we’ve got quite a few tools now, so they are all round fixing the mistakes they make – seems to be part of ‘upgrading’ – they break something perfectly usable, then have to fix it.

I have to laugh, as my car is over 19 years old and just doesn’t break. 100% reliable.

I currently have 3 boxes of engine parts and a broken engine in the garage. Oh and 4 18″ alloy wheels and a spoiler off his mates A3 – ‘apparently’ he can sell them on ebay – not had any luck with the wheels yet – keeps getting no-shows.

Drives me mad. Looks like he’ll be living here till he’s 90.

It’s a tosser warning system. I look but not at the crapbox car or the childmind adolescent in a man’s body driving it but to see the face of the partner sat in the passenger seat, it’s often a dejected look of resignation.

There’s one that drives past where I work banging and popping like crazy. I managed to look out the window as it came around the bend, the other day and it’s a rusty old Astra van. It’s clearly got something going on under the hood, but it looks like a POS (probably on purpose)

Its nice for all the ambulance crews, shift workers as well. Nothing neats being woken ny shotgun noises when you need to be asleep
Ptsd vets are also big fans of muppettry
As are most dog and cat owners, and parents of small children, all of whom are extremely fond of random unexpected loud bangs from a slammed golf mk3 doing accelerat, lift off, accelerate in 2nd gear just for the sake of it

What ever happened to balanced throttle driving, i suppose it doesn’t grab the attention of every teenage girl in the vicinity

my old Subaru STI Type-R used to do it (proper one, 3 door in sonic blue with correct gold alloys), helped announce my arrival in my yooth. It did 0-60 in 3.9, foot on the accelerator for more then 2 secs and it’s was straight to jail speed.
Your only young once

My neighbours have an RS3 which sounds like an old tractor, and if it was my £40/50K (?) super=hatch, I’d be embarrassed.

My brother had one, sounded great. 🙂

@jmmtb

For all of you old gits moaning and frothing at the mouth about this silly little distraction, how about you just sit back in your comfortable pensions, or your overpaid jobs, and your massive house equity and your stable little lives and just suck it up. Our youngsters have been landed with a fkd climate, a ruined NHS, a lifetime of debt and a bloody global pandemic, how about cutting them some slack. FWIW, I’d much rather have my ears assaulted by silly little petrol hatchbacks than my lungs ruined by shitbox German diesel estate cars and 4x4s accelerating past me belching black unburnt shite everywhere.

Try revisiting you opinion when you have to live within a mile of a park and ride car park.

I’m not old, I’m not generally grumpy, and the way the economy has decided to repeatedly f*** itself or be f***ed by retired brexit voting boomers I’ll be lucky to have a f***ing pension at this rate.

I am however grumpy because some STI ridden little shit was revving the tits off his car trying to make it go bang and impress his equally scrotal disease ridden mates for 4 hours from about 9 till 1am meaning when my alarm did go off at 6 I couldn’t face riding to work so I’ll take some solace in knowing you consider me driving to work sufficient payback on the ****.

The only slight bit of joy I get from it is that once a fortnight one of them wraps their car round a lamp post whilst drag racing between the lights on the 40-mph limit bypass.

There might be a few folk on here old enough to remember the times below ….
Many years ago when we were Road Rallying ( anyone remember those ! ) a Chevette HS, we had some problems setting up the carbs on the day of the ‘Coleman Tyres’ MN round and it ended up back firing unintentionally ! ( Road Rallies used to run overnight for those not old enough to remember ).
We passed the noise check and set off, during the rally we were back firing on all the heavy braking until it suddenly got louder and the hedgerows were lit up …. sadly we had blown a hole in the exhaust and flames were being emitted underneath … we continued in a spectacular fashion until the midway petrol halt when we couldn’t repair it and failed the noise check ! So we had a slow noisy drive home !