Exhaust Soot
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You should expect a fair amount of soot in the exhaust pipes, especially if your running the active exhaust most/all of the time. There are products that will make it a bit less likely to build up and easier to wash off - even a little car wax will help.
If you getting soot on a larger scale across the rear end, then it sounds like something is amiss.
If you getting soot on a larger scale across the rear end, then it sounds like something is amiss.
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Unlike my V6 F-Type where the insides of the exhaust tips blacken up fairly quickly.
That said I have never noticed any build up of soot on the back end, just in the exhaust tips.
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I still think there is big differnce between sooty pipes (preferably inside) and soot deposits on your bodywork.
Perhaps, you are running too rich OR pehaps you are running too SLOW!!
See below:
BY K.C. COLWELL AND BENJAMIN PRESTON
SEP 4, 2018![](https://hips.hearstapps.com/hmg-prod.s3.amazonaws.com/images/2017-chevrolet-corvette-grand-sport-122-1531250455-1-1536070271.jpg?crop=1.00xw:0.822xh;0,0.0866xh&resize=480:*)
MICHAEL SIMARI CAR AND DRIVERIn the past, a black tailpipe in a gasoline-powered car meant one thing: a fuel mix that was too rich, or sub-stoichiometric, causing unburned hydrocarbons to coat the inside of the tailpipe. Today’s engines run three-way catalysts to scrub any unburned hydrocarbons that escape the various other emission-control systems, leaving very few to darken our tailpipes.
And yet, many modern tailpipes are blackened. According to John Hoard, an associate research scientist in the mechanical engineering department at the University of Michigan, gasoline direct-injection engines, like diesel engines, have a tendency to produce particulate matter, also known as soot. This unfortunate byproduct is a result of direct injection engines' tendency to produce small clusters of rich air/fuel mixture, as well as coat the cylinder walls with liquid gasoline, leading to what are known as pool fires. These conditions are particularly apparent not during aggressive driving but under low load conditions because the intake velocity isn't sufficient to generate the swirling effect needed to effectively mix fuel and air and eliminate any rich areas. Toyota and Ford, among others, have switched to dual injection (both port and direct fuel injectors) in part to combat this phenomenon and increase overall efficiency.
Modern diesel engines have particulate filters to counter soot production. Diesel particulate filters occasionally run a regeneration mode in which the exhaust temperature is increased and the trapped soot burns off, reducing filter pressure. In most cars this happens in the background without the driver having any knowledge of its occurrence, though owners of modern diesel vehicles know when this happens as fuel economy drops precipitously. Gas engines in the States are soon to follow their compression-ignition brethren and Volkswagen has even introduced particulate filters for a few of its engines in overseas markets, notably the turbocharged 1.0-liter inline-three in the Up! GTI.
Perhaps, you are running too rich OR pehaps you are running too SLOW!!
See below:
Why Are Modern Cars' Tailpipes Often Dirty?
Although cars run cleaner than ever, a phenomenon with direct-injection systems makes it not always appear that way.BY K.C. COLWELL AND BENJAMIN PRESTON
SEP 4, 2018
![](https://hips.hearstapps.com/hmg-prod.s3.amazonaws.com/images/2017-chevrolet-corvette-grand-sport-122-1531250455-1-1536070271.jpg?crop=1.00xw:0.822xh;0,0.0866xh&resize=480:*)
MICHAEL SIMARI CAR AND DRIVERIn the past, a black tailpipe in a gasoline-powered car meant one thing: a fuel mix that was too rich, or sub-stoichiometric, causing unburned hydrocarbons to coat the inside of the tailpipe. Today’s engines run three-way catalysts to scrub any unburned hydrocarbons that escape the various other emission-control systems, leaving very few to darken our tailpipes.
And yet, many modern tailpipes are blackened. According to John Hoard, an associate research scientist in the mechanical engineering department at the University of Michigan, gasoline direct-injection engines, like diesel engines, have a tendency to produce particulate matter, also known as soot. This unfortunate byproduct is a result of direct injection engines' tendency to produce small clusters of rich air/fuel mixture, as well as coat the cylinder walls with liquid gasoline, leading to what are known as pool fires. These conditions are particularly apparent not during aggressive driving but under low load conditions because the intake velocity isn't sufficient to generate the swirling effect needed to effectively mix fuel and air and eliminate any rich areas. Toyota and Ford, among others, have switched to dual injection (both port and direct fuel injectors) in part to combat this phenomenon and increase overall efficiency.
Modern diesel engines have particulate filters to counter soot production. Diesel particulate filters occasionally run a regeneration mode in which the exhaust temperature is increased and the trapped soot burns off, reducing filter pressure. In most cars this happens in the background without the driver having any knowledge of its occurrence, though owners of modern diesel vehicles know when this happens as fuel economy drops precipitously. Gas engines in the States are soon to follow their compression-ignition brethren and Volkswagen has even introduced particulate filters for a few of its engines in overseas markets, notably the turbocharged 1.0-liter inline-three in the Up! GTI.
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SinF (05-30-2021)
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I still think there is big differnce between sooty pipes (preferably inside) and soot deposits on your bodywork.
Perhaps, you are running too rich OR pehaps you are running too SLOW!!
See below:
BY K.C. COLWELL AND BENJAMIN PRESTON
SEP 4, 2018![](https://hips.hearstapps.com/hmg-prod.s3.amazonaws.com/images/2017-chevrolet-corvette-grand-sport-122-1531250455-1-1536070271.jpg?crop=1.00xw:0.822xh;0,0.0866xh&resize=480:*)
MICHAEL SIMARI CAR AND DRIVERIn the past, a black tailpipe in a gasoline-powered car meant one thing: a fuel mix that was too rich, or sub-stoichiometric, causing unburned hydrocarbons to coat the inside of the tailpipe. Today’s engines run three-way catalysts to scrub any unburned hydrocarbons that escape the various other emission-control systems, leaving very few to darken our tailpipes.
And yet, many modern tailpipes are blackened. According to John Hoard, an associate research scientist in the mechanical engineering department at the University of Michigan, gasoline direct-injection engines, like diesel engines, have a tendency to produce particulate matter, also known as soot. This unfortunate byproduct is a result of direct injection engines' tendency to produce small clusters of rich air/fuel mixture, as well as coat the cylinder walls with liquid gasoline, leading to what are known as pool fires. These conditions are particularly apparent not during aggressive driving but under low load conditions because the intake velocity isn't sufficient to generate the swirling effect needed to effectively mix fuel and air and eliminate any rich areas. Toyota and Ford, among others, have switched to dual injection (both port and direct fuel injectors) in part to combat this phenomenon and increase overall efficiency.
Modern diesel engines have particulate filters to counter soot production. Diesel particulate filters occasionally run a regeneration mode in which the exhaust temperature is increased and the trapped soot burns off, reducing filter pressure. In most cars this happens in the background without the driver having any knowledge of its occurrence, though owners of modern diesel vehicles know when this happens as fuel economy drops precipitously. Gas engines in the States are soon to follow their compression-ignition brethren and Volkswagen has even introduced particulate filters for a few of its engines in overseas markets, notably the turbocharged 1.0-liter inline-three in the Up! GTI.
Perhaps, you are running too rich OR pehaps you are running too SLOW!!
See below:
Why Are Modern Cars' Tailpipes Often Dirty?
Although cars run cleaner than ever, a phenomenon with direct-injection systems makes it not always appear that way.BY K.C. COLWELL AND BENJAMIN PRESTON
SEP 4, 2018
![](https://hips.hearstapps.com/hmg-prod.s3.amazonaws.com/images/2017-chevrolet-corvette-grand-sport-122-1531250455-1-1536070271.jpg?crop=1.00xw:0.822xh;0,0.0866xh&resize=480:*)
MICHAEL SIMARI CAR AND DRIVERIn the past, a black tailpipe in a gasoline-powered car meant one thing: a fuel mix that was too rich, or sub-stoichiometric, causing unburned hydrocarbons to coat the inside of the tailpipe. Today’s engines run three-way catalysts to scrub any unburned hydrocarbons that escape the various other emission-control systems, leaving very few to darken our tailpipes.
And yet, many modern tailpipes are blackened. According to John Hoard, an associate research scientist in the mechanical engineering department at the University of Michigan, gasoline direct-injection engines, like diesel engines, have a tendency to produce particulate matter, also known as soot. This unfortunate byproduct is a result of direct injection engines' tendency to produce small clusters of rich air/fuel mixture, as well as coat the cylinder walls with liquid gasoline, leading to what are known as pool fires. These conditions are particularly apparent not during aggressive driving but under low load conditions because the intake velocity isn't sufficient to generate the swirling effect needed to effectively mix fuel and air and eliminate any rich areas. Toyota and Ford, among others, have switched to dual injection (both port and direct fuel injectors) in part to combat this phenomenon and increase overall efficiency.
Modern diesel engines have particulate filters to counter soot production. Diesel particulate filters occasionally run a regeneration mode in which the exhaust temperature is increased and the trapped soot burns off, reducing filter pressure. In most cars this happens in the background without the driver having any knowledge of its occurrence, though owners of modern diesel vehicles know when this happens as fuel economy drops precipitously. Gas engines in the States are soon to follow their compression-ignition brethren and Volkswagen has even introduced particulate filters for a few of its engines in overseas markets, notably the turbocharged 1.0-liter inline-three in the Up! GTI.
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It also has another 18 months on the factory warranty and was sold as a CPO through 12/24. I’m not worried about the repair bill, but wasn’t sure if this was normal or not?
I used to be a tuner, but forgive my ignorance when it comes to these cars. My experience lies with 4G63T motors. Had one of those little buggers putting down 436WHP at 29psi of boost. Anyway, I would think things would be similar.
Wouldn’t a rich condition cause a fuel trim malfunction CEL? Unless all the soot is being generated at WOT in which case the O2 sensor voltage is probably ignored. Provided it’s like what I’m used to tuning.
Other than a WBO2, which I don’t have anymore, I don’t know of any way for me to check the AFR.
Thanks everyone for the responses so far.
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Only coz the EPA is fixated on the eeeevil CO2 as an "emission" (it's not a pollutant in any sense) and GDI increases combustion efficiency thereby increasing fuel economy and reducing CO2.
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