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  #1  
Old 12-02-2002, 12:47 AM
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unexpected boost

Funny thing happened tonight, I stopped my 300D ( Euro 91' 124) for a partial fill up, and soon after getting back onto the highway the engine was a lot louder than usual while accelerating hard, but not at cruising speed, which to me rules out an exhaust problem (louder under load or not, am I wrong?) and the car felt a lot snappier, nice but I enjoyed quieter. What do you think happened?

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Old 12-02-2002, 11:31 AM
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Sounds like an exhaust problem is at least a strong possibility. The engine makes much more noise when it's under load. Also, if you have a seam opening up, it could spread under pressure and close up some when not. You might look around for tell tale black soot that usually marks exhaust leaks.

With less back pressure the turbo will spool up more quickly and potentially reach higher boost depending on wastegate settings, etc....

Frank.
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Old 12-02-2002, 04:17 PM
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For me it was the opposite... If I took it slow it seemed to be much louder due to the lower pitch of noise. Which caused everything to resonate. Going through alleys late at night was fun! Heh heh

But I would start by examining the exhaust.
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Old 12-03-2002, 05:25 PM
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"Sounds like an exhaust problem is at least a strong possibility"
Yeah, good call Elripster, possibility has turned into certainty yesterday, the whole muffler made the trip back home in the trunk, It just fell off. The MB tech told me today I should change the entire line, Whoa, that's is expensive.
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Old 12-03-2002, 05:27 PM
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Well maybe you can go with some flow master set up.... etc.. just kidding of course, might make the car fast though...

Frank.
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Old 12-03-2002, 05:28 PM
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I would agree with the tech. Look how long the original one lasted. Replace it from the engine back with oem parts.
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Old 12-03-2002, 07:02 PM
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Actually I would look into some stainless steel exhaust... Yes it costs more but look at what you save with virtually never having to replace your exhaust again. Regardless of how short of trips you drive or how long.
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Old 12-03-2002, 09:22 PM
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That's interesting that you should have to change the entire line. I take it the car sees a fair amount of moisture? Maybe road salt?

Typically in a catalytically equiped gas car the exhaust rots from the cat back and inside out because water is a by product of the catalyst process. With diesels here in Southern California, well my old benz is 24 this coming year it has original exhaust with no signs of more than surface rust. My current 82 300SD has some large canister things, don't know if they are calalytic converters or what, but has no signs of significant rust.

Unless the exhaust does have servere rust through out, you might not need to replace the whole line. Worth a check anyway if you want to save a buck.

Stainless Steel would certainly solve the corrosion problem though.

Frank.

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