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Vast amounts of black soot from 997.2

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Old 10-04-2009, 04:11 AM
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rijowysock
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Default Vast amounts of black soot from 997.2

right now i have the fabspeed center muffler bypass and hacked side mufflers and i just have an incredible amount of black soot from my car.. so much that at every joint in the exhaust i have piles of soot coming from them as well (all bolts 19lbs/ft as reccomended by porsche (were tighter before but then i had the shaking problem well known on 997.2)

yes i drive the car hard, very hard.. but i also still get very good gas mileage (so it doesnt seem to be running super rich)

also, as far as oil consumption i have only used about 1.2 quarts for the first 4000 miles.


should i be concerned since oil consumption is low, and gas mileage is normal?

the only other problem i have with the car is cold starts sometimes take a few seconds, but the car drives fine under WOT so ive been told that doesnt sound like a HPFP issue but just a twitch of the particular car/

-riley

notice tips, oozing with black soot (car washed 40-50miles prior)... after a few hundred miles the tips are completely black, and bumper black as well around exhaust.

http://i85.photobucket.com/albums/k4...s/Porsche9.jpg
Old 10-04-2009, 08:59 AM
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mdrums
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My soot issue has eased up a little...just slightly...but still there. Funny things is when I go off for a track weekend the car lives at 4000-7400rpm full throttle all the time and the tip turn a whitish grey and zero soot. On the drive home from the track they tips and rear bumper soot up.

All I can say is Porsche knows of this issue, will not do anything about it and could care less about it. I am glad this car is under warranty, and I do not actually own it and after 3 years it will be gone....soot and oil burning issue and all. As it stands right now I will not get another Carrera S but I will have some sort of sports car.
Old 10-04-2009, 01:39 PM
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stevepow
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Wow - no soot here - but I've only just cleared 2Kish on the odo. I wash the tips with the car and they don't even come close to competing with the brake dusted wheels - really no worse than any car I've owned. At what point did this soot thing kick in, or was it from day 1?
Old 10-04-2009, 02:30 PM
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996toomey
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Originally Posted by mdrums
My soot issue has eased up a little...just slightly...but still there. Funny things is when I go off for a track weekend the car lives at 4000-7400rpm full throttle all the time and the tip turn a whitish grey and zero soot. On the drive home from the track they tips and rear bumper soot up.

All I can say is Porsche knows of this issue, will not do anything about it and could care less about it. I am glad this car is under warranty, and I do not actually own it and after 3 years it will be gone....soot and oil burning issue and all. As it stands right now I will not get another Carrera S but I will have some sort of sports car.
I have been reading these soot threads just to stay on top of the DFI cars. Your second paragraph sounds like you have had enough.
Old 10-04-2009, 03:13 PM
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ADias
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I am convinced that exhaust mods create those problems. Yes, the ECU compensates back changes but does so making the engine run richer.

BTW... the new Vette w/ the LS3 engine (stock) also produces a lot of soot.
Old 10-04-2009, 03:14 PM
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Bob Rouleau

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Funny, I have 10000 KM on my 4S and burn no oil. No soot either on my white car.
Old 10-04-2009, 03:30 PM
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mdrums
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Originally Posted by 996toomey
I have been reading these soot threads just to stay on top of the DFI cars. Your second paragraph sounds like you have had enough.
Very frustrated with Porsche as a company...they really do not care and I am dead serious about this. Here is how I feel:JFIFC  !"$"$C A" ĵ}!1AQa"q2#BR$3br %&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz   ĵw!1AQaq"2B #3Rbr $4%&'()*56789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz ?9YPrV<J6ᓏ_qZKʳLnLCUkR9~1?*YGG` CqH0Yf[J $z쎕kB]ۇ-gȦ HeQ<dH Ө*=EYѰ@{SgLHX d拁bt)"fXQ,l`r뚚4@2,<TЎsix?Kep{ U;\=@Z3{Ų3ܒj\GLk'bb) R#4YZUnvsMNƖ_)4Ev!I^pݍMk2bh[#%(Y3Ӻ-V&"rz]O $tq)E,I=u\LHRUpq[s4lN#!汩MtZowLK|֢.> 9#q$Wm7ZF%Ot-;Go;Żɢ@3 &FhrHu?) _QE@B>᜷^+SZӯ-|ƙXNztvv^Z1,`1zO*/]Yx_X`ַ6![pe G g#8EfbKU#oYKrY@eb&8)9Q#ߥZp tojo,1Ps~j,/>p7R@$uFJl:{Z6="x, dm"m: Sr1ݞƹmVF ,c;I)n\ *kZ,@A> 1"[u[kR%U!uzBj)١—O{:: t5zMHy5c i092@;XU?ڬP. 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Old 10-04-2009, 03:32 PM
  #8  
ADias
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Originally Posted by Bob Rouleau
Funny, I have 10000 KM on my 4S and burn no oil. No soot either on my white car.
Bob: Have you modded your exhaust?
Old 10-04-2009, 03:36 PM
  #9  
mdrums
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Originally Posted by ADias
Bob: Have you modded your exhaust?
There are stock exhaust cars that are sooting....they are at my dealer and some hve posted here. All the stock exhaust does is keep the soot from easily flowing through th stock exhaust. Aftermarket exhaust is more free flowing and allows the soot to escape. The soot issue has to do with engine tuning. My dealer says he was told the cars are running very rich at low rpms.
Old 10-04-2009, 03:41 PM
  #10  
996toomey
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I don't blame you mdrums.

I have been very lucky with my Porsche cars but when I read here about soot, oil consumption, rms etc. and the response from Porsche is this is normal I do not like it.
Old 10-04-2009, 03:43 PM
  #11  
aggie57
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My 09 C2S has 3000km and a very black exhaust. The car is white also and I've had the soot polished of the back of the car once already. It's mainly used to commute in the city.
Old 10-04-2009, 04:14 PM
  #12  
mstams
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Wow, mdrums. That's a lot to read from my mobile phone!! Sorry it's that bad for you. Mine exhaust seems a little dirtier than non-DFI but never enough to get onto the bumper.
Old 10-04-2009, 05:47 PM
  #13  
rijowysock
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Originally Posted by stevepow
Wow - no soot here - but I've only just cleared 2Kish on the odo. I wash the tips with the car and they don't even come close to competing with the brake dusted wheels - really no worse than any car I've owned. At what point did this soot thing kick in, or was it from day 1?
day 1: i drove 1000 miles from ohio and when i arrived in florida... they were dark but not that dark...

day 2---20: didnt drive too hard and not much soot.

day 21--60(now): drive the vehicle hard, and the tips are dripping black soot after 50 miles of hard driving... if i leave them after 200-250 miles of hard driving the entire tip is black, front to back, and every joint on the exhaust is leaking black soot as well...

i will say, i did not burn a drop of oil until after day 35... between days 35-50 i burned 1.2 qt's and then have not burned any since.. was very odd to me to have such a random burning of oil.. but maybe in that time i got on it too aggressively while engine warming up and that was cause of oil burn?

sorry if confusing, tried to simplify as much as possible.


exhaust: modded on day 2 FYI.

when i floor it off the line, i see a black cloud behind me as well. so shows you when the soot is coming out, but gas mileage is still about same as when stock.
Old 10-04-2009, 06:04 PM
  #14  
stevepow
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So I wonder what happens with the stock exhaust? 2-3 years later you discover you car has gained 30 pounds and the exhaust is all clogged up? Strange stuff - yet another thing to keep an eye on. Cars! It's always something with them.

I'm way beyond day 60 though - day 120 or so. Oil consumption is about average or what I read - uses a bit, but I have only topped it once in 2k+ miles - added a quart at around 1.2k IIRC. And now it shows one "tick" low, but I'm not topping it anymore - one tick low is my goal as to not get tricked into overfilling by the randomness of the reading.
Old 10-04-2009, 06:38 PM
  #15  
mdrums
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Originally Posted by stevepow
Cars! It's always something with them.
Have you owned a boat?.....that is a real pain....but living on the water I goota have one.


Quick Reply: Vast amounts of black soot from 997.2



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