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89tipintara

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exhaust feedback
« on: Aug 21, 2003, 05:16PM »
Can anyone help me with a problem with my exhaust. recently i had the muffler exchanged because of a rattle at 2,500 revs. both accelerating and deaccelerating. now with the new muffler the noise is a deep feed back noise like heavy metal feedback through a sub with gain on max. the noise is accompanied by a slight vibration. feels like it is coming from the middle or towards the mainfold. i have had a massive loss in power recently but this noise has been around for a while. could it be a gasket?
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Offline Xnissman

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Re:exhaust feedback
« Reply #1 on: Aug 22, 2003, 12:02AM »
stuffed cat ??? stuffed resonator ??? :-\
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Offline RichTRX

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Re:exhaust feedback
« Reply #2 on: Aug 25, 2003, 01:49AM »
I filled my car with Woolworths + petrol once and it's never been the same... the exhaust is noticably raspier and it lacks the power down low that it did have. I think it's gone through and dirtied everything. It's been a lot better since I've been using the BP Ultimate, but not 100% Any suggestions? I'm thinking cleaning the injectors.
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His: 2001 Audi S4 biturbo quattro 6sp, Nogaro Blue/black leather recaros, microsilver trim, bose 10sp, SSAC 2.5" twin turboback, RS4 rear sway, 25% tint

Hers: MY99.5 Audi A4 1.8T Quattro GP Edition AVANT 5-sp, phantom black, black leather buckets/walnut/sunroof, 2.5" D&T Turboback, K04-015, N75J, 710N DV

Bro driving: 1990 Nissan Pintara TRX 5sp Red, 16" Rozzis, Lukey 4-2-1 ext, 2.5" full exhaust, hi-flow cat, cone cai, stg 3 chip,  low Kings, GT Gas shocks, Urethane bushings, slotted front rotors, 398000k and still going strong; 0-100 in around 7.2-7.4 seconds

89tipintara

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Re:exhaust feedback
« Reply #3 on: Aug 27, 2003, 02:19PM »
rich my car has been a hell of a lot better since a dumped the oil, and replaced it with a low grade oil, filled the tank completely with bp ultimate and ran some injector cleaner through it. at first not much change occured but when i filled the car a second time without injector cleaner idle was smoother, response better. i worked the engine pretty hard for that first tank. a friend suggested this for a new oil change, fuel change and injector cleaner. beats me why but seemed it has worked. remeber if u havent got a chip then the ecu needs time to adjust to higher octane fuel.
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Mr Trx

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Re:exhaust feedback
« Reply #4 on: Aug 27, 2003, 09:28PM »
i have a muffler installed  it is very slugggish at low rpm but very repsonsive and it pulls nicelly in 4th past 2.750rpm. i neva put cheap fuel in y dont u use shell optimax works 4 me.
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trxadelaide

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Re:exhaust feedback
« Reply #5 on: Aug 29, 2003, 04:43PM »
I rekon Shell Optimax is crap. In my old escort I had VERY advanced ignition timing therefore it would ping something shocking unless i ran high octane fuel. Anyway, it would still ping a bit when I used Optimax and would stop if I put in BP Ultimate. I tried this out several times and with always the same result..

come to your own conclutions....
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89tipintara

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Re:exhaust feedback
« Reply #6 on: Aug 29, 2003, 05:21PM »
if i try optimax now with the car running good again then the chances of a dramatic change is minimal me thinks. mr trx have you tried bp ultimate? whats differences did u find between them if u have?
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Offline Budgie

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Re:exhaust feedback
« Reply #7 on: Aug 29, 2003, 10:18PM »
I just put a tank of optimax through my Corsair, and it ran pretty bad.  It stalled on me four times, when i slowed to a set of lights (from 60kmph or something) and was sitting there idling for a second, then it would konk out!  It never done that before, and its just had a major service (new plugs, etc).

Surprisingly, it runs better on Safeway + petrol versus optimax...
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Offline Xnissman

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Re:exhaust feedback
« Reply #8 on: Aug 30, 2003, 01:07AM »
i have used bp ultimate since mtr. rebuild & seems to be the good stuff ;)
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Take it to the limit - take it to the track.
speed safe; club level motorsport.
Life is like a box of chocolates.

Mr Trx

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Re:exhaust feedback
« Reply #9 on: Sep 2, 2003, 06:16PM »
lol u guys all have probs anyways i run fine when i put bp ultimate it was the same btu onli one difference that i get less of a pulling effect when i accelerate hard. but with optimax it works sweat as.....  8)
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Offline RichTRX

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Re:exhaust feedback
« Reply #10 on: Sep 2, 2003, 08:33PM »
Quote from: PintaTi on Aug 27, 2003, 02:19PM
rich my car has been a hell of a lot better since a dumped the oil, and replaced it with a low grade oil, filled the tank completely with bp ultimate and ran some injector cleaner through it. at first not much change occured but when i filled the car a second time without injector cleaner idle was smoother, response better. i worked the engine pretty hard for that first tank. a friend suggested this for a new oil change, fuel change and injector cleaner. beats me why but seemed it has worked. remeber if u havent got a chip then the ecu needs time to adjust to higher octane fuel.

did the exhaust feedback go away?
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His: 2001 Audi S4 biturbo quattro 6sp, Nogaro Blue/black leather recaros, microsilver trim, bose 10sp, SSAC 2.5" twin turboback, RS4 rear sway, 25% tint

Hers: MY99.5 Audi A4 1.8T Quattro GP Edition AVANT 5-sp, phantom black, black leather buckets/walnut/sunroof, 2.5" D&T Turboback, K04-015, N75J, 710N DV

Bro driving: 1990 Nissan Pintara TRX 5sp Red, 16" Rozzis, Lukey 4-2-1 ext, 2.5" full exhaust, hi-flow cat, cone cai, stg 3 chip,  low Kings, GT Gas shocks, Urethane bushings, slotted front rotors, 398000k and still going strong; 0-100 in around 7.2-7.4 seconds

Offline PanosTRX

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Re:exhaust feedback
« Reply #11 on: Sep 17, 2003, 02:33PM »
can i suggest it has nothing to do with the fuel you use. i had a rattleing problem at 2500rpm. came from the cat under the car. i thought the cat had stuffed up from the o2 sensor making the mixture too rich but it was in fact the dudes who put the exhust in left small metal fragments from the welding. once i got that removed the noise has gone....food for thought buddy.... 8)
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