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Author popping/banging from exhaust, bad for engine?
Adam_B
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Registered: 13th Dec 00
Location: Lancashire
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27th Sep 11 at 22:27   View User's Profile U2U Member Reply With Quote
If I accelerate hard and change gear about 5500rpm I sometimes get a pop from the exhaust, occasionally its quite a loud bang, is this bad for my engine or turbo? What actually causes it?

Its a remapped z20let with a miltek precat and rear box but the standard regular cat.
Warren G
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Registered: 14th May 06
Location: Kent
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27th Sep 11 at 22:31   View User's Profile U2U Member Reply With Quote
unburnt fuel in the exhaust causes popping

like below 1500rpm it will burrble as the fuel cut off is deactivated, and fuel (unignted enters the exhaust)

is it bad - no
Paul_J
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Registered: 6th Jun 02
Location: London
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27th Sep 11 at 22:32   View User's Profile U2U Member Reply With Quote
it's just fuel blowing through and then igniting on the exhaust... I wouldn't worry about it.

Basically cams have an overlap on some engines to improve performance... so as the exhaust is closing, the inlet starts opening (so that the exhaust gasses leaving help suck the air in) ...

However, at this moment, there's the chance of unburnt fuel potentially getting sucked into the exhaust. then when it ignites it pops / bangs
Adam_B
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Registered: 13th Dec 00
Location: Lancashire
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27th Sep 11 at 22:33   View User's Profile U2U Member Reply With Quote
ok thats alright then I quite like it but I do feel like a bit of a chav
Graham88
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Registered: 16th Apr 07
Location: South East Kent Drives: E46 M3
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27th Sep 11 at 22:39   View User's Profile U2U Member Reply With Quote
Mine does it every now & again & I get excited
redtom
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Registered: 6th Oct 07
Location: Kent
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27th Sep 11 at 22:42   View User's Profile U2U Member Reply With Quote
Mine does it everytime and i still get excited
Kieran
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Registered: 12th Sep 08
Location: Kent
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27th Sep 11 at 22:44   View Garage View User's Profile U2U Member Reply With Quote
Same Tom! Hi 5!
Graham88
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Registered: 16th Apr 07
Location: South East Kent Drives: E46 M3
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27th Sep 11 at 22:45   View User's Profile U2U Member Reply With Quote
Well jel
redtom
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Registered: 6th Oct 07
Location: Kent
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27th Sep 11 at 22:50   View User's Profile U2U Member Reply With Quote


[Edited on 27-09-2011 by redtom]
marklawton
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Registered: 24th Apr 05
Location: Pensby, Wirral Drives:Golf mk4 GTI
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27th Sep 11 at 23:00   View User's Profile U2U Member Reply With Quote
dont worry about it adam. put an precat etc on to a z20let or leh and they all pop and bang so its normal for our engines
BeetleGav
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Registered: 27th Jun 10
Location: lancashire, nelson
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27th Sep 11 at 23:30   View User's Profile U2U Member Reply With Quote
my 12v burbles when i lift off, sounds quite good for a 1.0, people keep asking if ive done a conversion on it lol think it might be because my front section is blowing
Gareth
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Registered: 2nd Mar 00
Location: Derby, Drives: EVO VIII MR & pug 308
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27th Sep 11 at 23:37   View User's Profile U2U Member Reply With Quote
Some of the evo boys have this mapped in for fun (some of the mappers even charge extra for pops n bangs) not my cup of tea though
Gareth
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Registered: 2nd Mar 00
Location: Derby, Drives: EVO VIII MR & pug 308
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27th Sep 11 at 23:39   View User's Profile U2U Member Reply With Quote
Forgot to say it defo carnt be bad as otherwise they wouldnt offer it as an extra
Eck
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Registered: 17th Apr 06
Location: Lundin Links, Fife
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28th Sep 11 at 01:41   View Garage View User's Profile U2U Member Reply With Quote
I get constant pops, bangs and flames Feel like a ned
BarnshaW
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Registered: 25th Oct 06
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28th Sep 11 at 05:40   View User's Profile U2U Member Reply With Quote
i have this mapped in , also if you get to high revs and change gear it bangs ridiculously loud.
JaffaTB
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Registered: 7th Oct 09
Location: Sheffield, South Yorkshire
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28th Sep 11 at 06:46   View User's Profile U2U Member Reply With Quote
my mates 10 plate focus rs loves to pop and bang
Russ
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Registered: 14th Mar 04
Location: Armchair
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28th Sep 11 at 06:47   View User's Profile U2U Member Reply With Quote
happens when i lift off on my bike
SportBoy
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Registered: 5th Oct 01
Location: Retford, Nottinghamshire
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28th Sep 11 at 06:55   View User's Profile U2U Member Reply With Quote
worst thing ive ever seen from anything like this is the exhaust blowing open
Mattb
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Registered: 2nd Feb 03
Location: Under your sisters bed
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28th Sep 11 at 08:34   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by SportBoy
worst thing ive ever seen from anything like this is the exhaust blowing open


My old 2.0 exploded the flexi joint

Didnt help that the omex full throttle shifter only cuts ignition and not fuel - dumped loads of fuel in the exhaust and then ignited it - sounded like war tbh!!
Steve
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Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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28th Sep 11 at 08:34   View Garage View User's Profile U2U Member Reply With Quote
Hope people aren't getting this mapped and running a cat
Seany
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Registered: 13th Dec 06
Location: Dunfermline, Fife : Drives Astra cdti Sri
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28th Sep 11 at 08:40   View User's Profile U2U Member Reply With Quote
The mini pops an bangs constantly.
JM_16v
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Registered: 17th Oct 05
Location: Essex Drives: GLC63S
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28th Sep 11 at 08:42   View User's Profile U2U Member Reply With Quote
my car retards the timing when i let off the throttle and dumps some fuel into the chamber, cooling the pistons and causing engine breaking,

this causes pops and bangs

although this is only on one of my high map so i can turn the switch onto mid map and drive in public with no pops and bangs
Mattb
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Registered: 2nd Feb 03
Location: Under your sisters bed
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28th Sep 11 at 08:52   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Steve
Hope people aren't getting this mapped and running a cat


would be rather amusing though
Chris F
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Organiser: East Anglia
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Registered: 26th Dec 05
Location: Newmarket Drives: Escort Van 1.8
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28th Sep 11 at 10:05   View Garage View User's Profile U2U Member Reply With Quote
Mine annoys me tbh
Iain M
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Registered: 18th Aug 05
Location: Wigan - Drives 272bhp corsa ZLET
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28th Sep 11 at 10:10   View User's Profile U2U Member Reply With Quote
Both my XE did this and my ZLET loved it.

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