i'm sure this has been posted about before, but i just spent an hour searching and didnt find any real answer. the problem is this:

i have a corsa exhaust system, with dual tips on each muffler. the inner tips on each one get HORRIBLY dirty with black as hell soot within 10 miles of driving weather i am doing heavy acceleration or not.

i just read a whole thread about people arguing about the flow of the corsas and they suck and no, they are awesome and yada yada yada, no body said anything about what i was trying to find out. I dont need to know why only the inner tips are dirty, i know thats the primary flow, my question is, why does it get soooooooo dirty.

i mean its horrible. i will clean em up, get em all nice and shiny(not super shiny or anything, just looking like stainless steel is supposed to look) and the very next time i look at em. and i look at them all the time, cuz my biggest pet peeve EVER is perfect dual exhaust. it has to be clean all the time, and it has to hang perfectly straight and level with eachother. and these dont, they are all uneven and crooked as hell, and always so damn dirty. i am going crazy. it also turns the bumper black because it has that greenwood package on it, and the tips dont go past the bumper.

this is a picture of one of the tips, right after i cleaned the inner one, so its a tad bit more shiny then the outter: http://www.grandprixforums.net/membe...ure7464-a.html

and this is after that, i drove it for less then 3 miles, and you can see how dirty the inner tips already are(and how @$!&%!! crooked they hang). http://www.grandprixforums.net/membe...ure7461-a.html (its not very good lighting, so all the tips look dirty, but the outers were just fine)

and here is one more picture from a different time, after just cleaning them recently: http://www.grandprixforums.net/membe...ure7456-a.html

but, if i even leave em alone for 2 or 3 times of driving it, they are blacker then death. so, WHY SO DIRTY, and how do i fix that.

sorry, one more question about it too, if i change the tips to make em longer, will that affect the way it sounds and flows? i ask because alot of what i read about the corsa is that the inners are the primary/performance exhaust flow, and the outer is just to help get rid of resonance. i dont want to affect that, this thing sounds great. thanks for the help, and sorry if this is drug out too long...

 

1. tune your car
2. black inside is somewhat normal, your's appears to be running rich, I see a new aircleaner in your future and possibly some 02 parts
3. if you bought those new and they were advertised as fitting your car , they're already long enough, have someone who knows what they're doing ,put them on right
4.dont overthink a muffler, it has no moving parts, you either like the sound or you dont
5. you may have dual tips, but if only one is getting dirty, flow is only comming out of one

 

Corsa's flow out of the inner set of tips, which is why only one gets dirty. if you touch the exhaust tips when it's running you'll definitely notice a difference in heat. Using a good metal polish like detail king or flitz will help the soot from sticking a bit, but it definitely seems like the car is running rich.

To adjust them, just get under the car and loosen the 2 band clamps that attach the muffler to the ypipe. with some force you should be able to wiggle them back and forth to get your exhaust to sit correctly.

 

your running rich

 

tuning ehh? i am new to corvettes, but on my other car, its the easiest thing to tune, as in, you can control whatever you want. are these the same way? i remember reading a post about how they are only somewhat tunable, whatever that means. I will def. look into tuning it then, but i have another issue i have to fix first, something is causing it to run super lean under 140* temp.. i have a hole other thread about that.

i'll have to take another look and see if i can adjust the exhaust myself. im probably wrong, but last time i was under there i think i remember everything being welded. i've read alot of posts about people using some kind of oven cleaner to polish em all up real good or that metal polish you're talking about and then putting armoral wheel protectant on it to keep the soot off. any of you guys done that, and has it worked?

thanks for the help.

 

Spray the inside of your exhausts black. They will turn that way eventually. This way they will be uniform. Just keep the outsides chrome.

 

yuck. i hate black exhaust tips. i want them to be clean.

 

Sounds like you got an issue to sort out. Know anybody with a scanner that can see whats going on in your open/closed loop bit?

Fixing the issue oughta help some but any exhaust pipe will get soot in it, no avoiding it. Soon as you start a fresh motor youll get black carbon somewhere inside just the nature of the beast.

 

i've been doing alot of things working with another guy on here who is having the exact same problem. just haven't narrowed it down yet.

yeah, the design of the tips isnt the best, the way it has the edge of the tips slant out and stuff(it doesnt just end, you can see that in my first picture link), gives a visible surface to get dirty. i have quad tips on my other car, kinda like these:http://csgbenefits.org/exhaust-tip3.jpg they are just slant cut straight off, no edge

 

I got tired of this issue on my daily driver ZR-1, the Corsa tips would look stupid by the time I got to work, even if they were spotless when I left home. painted the insides of both tips black; still plenty of "flash" from the outside of the tips.

 

hmm... im starting not to like the tips anyway. i like the sharp slant cut ones. so, since i would need a tune to fix the rich issue, where can that be done?

 

lol, if i had a zr-1 for a daily driver, i would be just fine with that..