Popping noise from exhaust
- Thread starter jem
- Start date
piggyboyz
Core Group Members
ZY, It's perfectly normal...
Imagine this...
When u r on throttle, the gas flow is constant but when u lift off, the the throttle body shuts and the back pressure will create the "void" within the exhaust system, hence u hear the pop...
Z4 especially noticable cos the exhaust is much shorter or on the higher cc car, where the exhaust volume is higher...
Imagine this...
When u r on throttle, the gas flow is constant but when u lift off, the the throttle body shuts and the back pressure will create the "void" within the exhaust system, hence u hear the pop...
Z4 especially noticable cos the exhaust is much shorter or on the higher cc car, where the exhaust volume is higher...
Racebred
Core Group Members
without being physically there to hear the exact sound, it could either be pressure induced, or it could be backfiring.
backfiring occurs when unburnt fuel travels down your exhaust pipe and is ignited along the way coz the pipe is too hot. this will further increase your exhaust temp. u could be running too rich, or something is causing incomplet combustion in your cylinders. this is an indication of a problem
for the evos, they run pretty rich from the factory, so a certain amount of backfiring is expected but not for a bmw.
backfiring occurs when unburnt fuel travels down your exhaust pipe and is ignited along the way coz the pipe is too hot. this will further increase your exhaust temp. u could be running too rich, or something is causing incomplet combustion in your cylinders. this is an indication of a problem
for the evos, they run pretty rich from the factory, so a certain amount of backfiring is expected but not for a bmw.
Racebred,
It's not backfiring. I've heard backfiring before. It's quite sharp and loud. Best described as exhaust barking.
This exhaust sound is like low popping. A bit like 'boop...booop.. booop." Very cute sound.
As Uncle mentioned, it's inherent on all Z4 2.5 and 3.0 as confirmed by the Z4 forum. I'm just wondering why and I guess Alan-Speedmonster-who-shot-pass-me-on-PIE-after-lunch has explained it.
It's not backfiring. I've heard backfiring before. It's quite sharp and loud. Best described as exhaust barking.
This exhaust sound is like low popping. A bit like 'boop...booop.. booop." Very cute sound.
As Uncle mentioned, it's inherent on all Z4 2.5 and 3.0 as confirmed by the Z4 forum. I'm just wondering why and I guess Alan-Speedmonster-who-shot-pass-me-on-PIE-after-lunch has explained it.
Welbo said:No picture to show.........have not take yet!
Actually take already also don't know how to post so sigh........
Hows the claypot ????
Cheers!
haha.. ok must show me next time...
Claypot was good.. we went for ice cream waffle at siglap after that.. was fun outing!
you going muthu curry next wk? Find nanny lah!
Tanzy, my take is this - the exhaust gas can be felt like a series of pulses. The low pressure tail end of an exhaust pulse will most definitely attract the high-pressure bow of the following pulse, effectively "sucking" it along. The runners on a header are specifically tuned to allow our exhaust pulses to "line up" and "suck" each other along. But since engines rev at various speeds, the exhaust pulses don't always exactly line up. When you throttle up or down, you are creating inconsistent pulses, hence the popping sound.
Welbo said:Knn......came to Siglap for ice-cream waffle (MY FAVOURITE!) also never sms me...
I whole night at home suck thumb!!!!!!!!
Will try to meet you guys next thursday after work but might have to work late so can't confirm.
Cheers!
8)
oppss... pai sey.. thot you would be sucking thumb at home so didnt want to disturb.. in case we inadvertently interfered with your household responsibilities.... kekekeke...
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