So I'm sitting here surfing Sig Forum and I hear what might possibly be gun shots. The sound and cadence wasn't right for fireworks. Is it gun shots? No, I don't think so. Or is someone beating on something? As it comes closer I realize it's an intentionally backfiring car. Every stop sign another string.

A few minutes later I'm hearing someone torturing their car, bouncing off the rev limiter. Not 2 or 3 times, more like 20 or 25. Then a few seconds later I hear it again. This keeps going for several minutes. Good lord dude, what are you trying to do to your engine? It was almost painful to listen to. (not audibly but mechanically) I guess they think it sounds cool?

These latest automotive trends are rather confusing.

I feel ya.

Then there's the morons that intentionally burn the tires off the rims while simultaneously holding the engine against the rev limiter and trying to melt down the exhaust system.

And what really makes my head hurt is that it's NOT some kid in a $500 junker, it's usually cars/bikes that cost more than my house!

quote:

Originally posted by cas:...I guess they think it sounds cool?

These latest automotive trends are rather confusing.

Yes x2.

I was working with a friend on a procharger and methods to make it as quiet as possible, a sleeper is not a good sleeper if it is talking in it's sleep.

So, naturally I do little googling to see what other's have discovered that are effective or a waste of time, and was surprised at the number of wankers that want as much whine and loudest waste dump as possible.

I understand the "scene" and the likes/dislikes of things change with time, and I am a "to each his own" kind of guy, but damn, son, I say, I SAY, what the hell's in that paste you been eatin', boy?

Hey, go easy here.

The guys making all this noise cannot hear it over the sound of their own insecurity.

The 'backfiring' is common on some high performance cars. Mercedes AMG, Jag FType, and a few others.

In some cases it sounds good, but in a neighborhood, I'd be annoyed too.

quote:

Originally posted by sigmonkey:

quote:

Originally posted by cas:...I guess they think it sounds cool?

These latest automotive trends are rather confusing.

Yes x2.

I was working with a friend on a procharger and methods to make it as quiet as possible, a sleeper is not a good sleeper if it is talking in it's sleep.

So, naturally I do little googling to see what other's have discovered that are effective or a waste of time, and was surprised at the number of wankers that want as much whine and loudest waste dump as possible.

I understand the "scene" and the likes/dislikes of things change with time, and I am a "to each his own" kind of guy, but damn, son, I say, I SAY, what the hell's in that paste you been eatin', boy?

UH, you didn't post the FogHorn LegHorn effect.

quote:

Originally posted by P250UA5:
The 'backfiring' is common on some high performance cars. Mercedes AMG, Jag FType, and a few others.

In some cases it sounds good, but in a neighborhood, I'd be annoyed too.

Yes, some AMG's do it when paddle shifting them. They retard timing, throttle, or something briefly as the transmission shifts.

I bet he’s not talking about AMGs. Maybe.


It’s usually the Honda/Mazda ricers around here doing that. Slow and Upset types.

It may be unburnt fuel in the exhaust track. It crackles and pops.

What cas is describing is called anti-lag or 2-step backfire. It's a deliberate attempt to get a turbocharged motor to backfire rapidly by bouncing the tach off the rev limiter.


https://youtu.be/GOMYum7WJgU

quote:

Originally posted by OKCGene:

quote:

Originally posted by sigmonkey:

quote:

Originally posted by cas:...I guess they think it sounds cool?

These latest automotive trends are rather confusing.

Yes x2.

I was working with a friend on a procharger and methods to make it as quiet as possible, a sleeper is not a good sleeper if it is talking in it's sleep.

So, naturally I do little googling to see what other's have discovered that are effective or a waste of time, and was surprised at the number of wankers that want as much whine and loudest waste dump as possible.

I understand the "scene" and the likes/dislikes of things change with time, and I am a "to each his own" kind of guy, but damn, son, I say, I SAY, what the hell's in that paste you been eatin', boy?

UH, you didn't post the FogHorn LegHorn effect.

It's implied.

I will have to admit I love the sound of properly done exhaust and a blow off valve. Drone, or pissing off neighbors - uncool.

Being from the "olde days", any "after fire" is typically an indication of several things, incorrect timing, leaking exhaust, too rich AFR, burnt, sticking exhaust valves or valve float due to valve spring binding, and none of them good or proper operation of engine.

In some cases, with circle track/spring style/outlaw cars, which are tuned to a point that some of the things above are "OK" because the performance gain is worth the "bad tuning", but most street/strip and straight line cars, it is indicative of poor performance.

And to me, it is like fingernail on chalkboard.

And most of the people doing it on the street, do it for the noise, not because they are squeezing every bit of performance out of their vehicle.

This ^^^^^

True story: The year was 1957. All was right with the world. My friend Gino and I had graduated from the Navy's Guided Missile School and we were attached to a Guided Missile Squadron based at NAS Chincoteage VA. Gino and I were both from the NYC area, and we car-pooled to spend some weekends at home, taking turns driving. I had a piece of shit 1950 Studebaker, Gino belonged to a hot-rod club (the Golden Wheels) and had a customized 1951 Mercury, that he was very proud of.

Our route from the DelMarVa peninsula took us over the Delaware Memorial Bridge and the NJ turnpike. A momentary ignition failure (loose ignition switch) in the Studebaker while coming down from the apex of the bridge led me to the discovery that if unburned fuel was allowed to accumulate in the exhaust system and then the ignition was switched back on, I would be rewarded with a really impressive backfire. Needless to say, this was pretty hilarious to a 19-year old, and it became a ritual to be observed on every trip home.

The trip after I discovered this delightful pastime, it was Gino's turn to drive his beloved Mercury. Coming down the bridge, I badgered him into trying the backfire trick. He left it in gear, turned the ignition off, and let the unburned fuel / air mixture accumulate in the exhaust. Near the bottom of the slope, he turned the ignition back on and we were rewarded with the mother of all backfires. I'm pretty sure that parts of the mufflers are still circling the Earth in low orbit. For the rest of the trip, instead of listening to the burble of dual glass-packs, we were rewarded with an ear-shattering roar that rivaled a gang of Harley riders with straight pipes at full throttle. We had not one, not two, but three separate "conversations" with patrol cops in two different states. That might have been the start of my hearing loss.

I agree with the 'blackboard-scatching' contingent.

Too much of a Mech E to be infatuated with the audio evidence of mechanical systems being abused.

As Orguss said, what you're hearing is a either a two step or anti lag system. A two step lets you set a low rev limiter for launching, and anti lag dumps fuel into the exhaust to keep a turbo spooled. Both sound ridiculous, but they do actually serve a purpose. Hell, the new Hyundai Velosters come like that from the factory.