>From:Tim Roller<starwolf@bewellnet.com
>The BAP,BAP, GURGLE,GURGLE,WOP,WOP and any other sounds that your exhaust
makes is all the normal sounds that a NORMAL performance muffler exhaust
makes. It's the normal SOUND-WAVES hitting each other as the exhaust enters
and leaves the muffler and goes over the axle and out the tailpipe. Please
don't be alarmed with this type of sounds. ON the other hand if you have a
RATTLEY sound from the muffler-it's time to replace the muffler or system if
it's worn out and rusty. If a loud BANG is heard from your exhaust, then
there is TOO-MUCH gas still going into the exhaust and igniting in the
system which needs to be looked into,as either the computer or any many
other sources, such as faulty exhaust valve,bad sensor unit,bad computer
closed loop system,faulty TB,etc, are not closing or shutting down properly
and gas is still being pumped into the exhaust (very minutely)but that's all
it takes. Usually you don't find this on today's cars unless it's CARBURATED
and it's hard to find the right air mixture when changing jets,pump
accelerators,vacuum advances,etc.
>Hope this helps with some of the noises.
>The factory or replacement mufflers are heavely baffled and sometime
packed with a meterial to keep the noise down. When you replace it with a
performance muffler and pipes these baffles in the muffler are redesigned
for LOWER-BACK PRESSURE, and in turns gives you more performance and sounds.
>later
-----Original Message-----
From: Jeff Lee <jlee@atlanta.nsc.com>
To: dakota-truck@buffnet.net <dakota-truck@buffnet.net>
Date: Monday, February 23, 1998 9:32 AM
Subject: Re: DML: Gibson exhaust installation
>Klaus Wilkens wrote:
>>
>> Very well put. That's why header manufacturers usually offer headers with
>> smaller primaries for the street and larger ones for race applications.
>>
>> Also the Bap Bap bap an be caused by a defective diverter valve on air
pump
>> equipped cars.
>>
>> KW
>>
>
>Klaus,
>
>Is the Bap Bap Bap sound you guys are referring to the sputter and
>popping noise that comes from the exhaust during closed throttle
>deceleration? I have a 98 V8 5spd with the stock exhaust system (for the
>moment ;} ), and the sputtering and popping is quite prominent during
>hard deceleration in low gears.
>
>My understanding of this phenomenon is that it is caused by minor
>amounts of unburned fuel entering the hot exhaust system and igniting,
>due to incomplete combustion during hard deceleration. Although I would
>have expected the SBEC to compensate for this by backing off the fuel
>flow, I have been told by a number of folks on this list that this is
>normal with the V8.
>
>Are you saying that this popping sound is not normal, and is caused by a
>defective diverter valve? Do the 98 Magnum engines even have an air
>pump? Can anybody else shed some light on this?
>
>Thanks.
>
>jeff
>98 RC 4x2 V8 5spd 3.55SG flares
>
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