Exhaust crackle

[Silver Ghia]

Originally Posted by FlipXW

Bloody F&F strikes again. Why would you double clutch in a car that's transmission has syncros? All its going to do is slow you down. Heel and toeing on the other hand (which I presume your talking about) yes sounds awesome when done right especially with crackle.

Yes, heel and toe when braking. That's the only way isn't it?

[irish2]

I believe a good crackle comes from more efficient exhaust scavenging. Only from anecdotal evidence though.

I had twin 2" exhaust after 4 into 1 heads on an AFR headed 306. Sounded angry. Put twin 2.5" and she sounded angrier, and had massive crackle from a high RPM lift off. Nothing else was changed except from the header flange back.

[GT69]

This yes - http://www.youtube.com/watch?v=2J8BM...RY1Om8kU7Jbcaz

POS car that sounds broken, no.

[devoGT]

Originally Posted by aussie muscle

Isn't the crackle just unburned fuel igniting in the exhaust pipe?

Yes, the "Crackle and Pop" that occurs on deceleration is a function of the tune in the PCM. The background is that when a deceleration condition occurs, the PCM / ECM uses a different timing table than the normal high / low tables. This "coast down" timing table is used to help slow the car down and assist with engine braking. This table is used prior to entering Deceleration Fuel Cut Off ( DFCO ) and in stock form tends to have negative timing values.

When you start to slow down and use the engine to aid in braking, this table is used and the timing values go from BTDC to ATDC. Because the timing has been pulled so far back, the fuel burns slower and is still burning when the exhaust valve opens. This results in some unburnt mixture entering the exhaust with the burning mixture, and as the gases expand they explode in the exhaust. This results in the pop / crackle.

If you get the car tuned, many tuners will dull the coast down table down a bit so it will reduce the occurrence of the pop / crackle before DFCO kicks in and stops it.

[XR6_661]

General consensus - We are all sad

[pottery beige]

Originally Posted by GT69

This yes - http://www.youtube.com/watch?v=2J8BM...RY1Om8kU7Jbcaz

POS car that sounds broken, no.

reverse double thong clap award

crackle

is

crap

[XB GS 351 Coupe]

Hate the crackle, sounds cheap and nasty like there is something wrong with the car.

[Chrisosicko]

Originally Posted by XB GS 351 Coupe

Hate the crackle, sounds cheap and nasty like there is something wrong with the car.

Must of never heard a worked boss335 on over run mate

[Alan D Segal]

Because racecar...

Probably just get your car impounded if you've got a modified car that does it in QLD under normal street driving conditions though.

[Nikked]

What about the "cowboy crackle"...?

[Dave R]

I'm on the fence about it- sometimes it can sound horrible. One example I do like is the SLS AMG, such a beautiful sound-

http://www.youtube.com/watch?v=xG8nQIBl7ig

[MercurySilver]

i like the crackle when its foot flat from 2nd to 3rd in the turbs

[Express]

Originally Posted by Alan D Segal

Probably just get your car impounded if you've got a modified car that does it in QLD under normal street driving conditions though.

Mercedes and BMW’s performance cars do it in normal driving conditions and get away with it without worries.



.

[MercurySilver]

yup and harleys can be as loud as an aircraft
go figure

[Alan D Segal]

Originally Posted by Express

Mercedes and BMW’s performance cars do it in normal driving conditions and get away with it without worries.

Because the cops automatically pull over the falcon/commodore in the lane next to it.

[XP6]

Crackle like a solid cammed clevo with a decent 2.5" twin.... Love it!

[STINKY NINJA]

Originally Posted by GT69

This yes - http://www.youtube.com/watch?v=2J8BM...RY1Om8kU7Jbcaz

POS car that sounds broken, no.

Awesome car and motor with exhaust crackle that makes my skin crawl...
I hate it with a passion,it sounds like a cheap slapper 253.
Hate it!

[XHBrad]

Loved the cackle and pop from my old XR6, really missing the sound.. Can't get that from a turbo diesel :/

[SPArKy_Dave]

Originally Posted by STINKY NINJA

Awesome car and motor with exhaust crackle that makes my skin crawl...
I hate it with a passion,it sounds like a cheap slapper 253.
Hate it!

Like this?
http://www.youtube.com/watch?v=9WQmaY7t9tQ

or this?
http://www.youtube.com/watch?v=MtdujYxNmkY