My car has been collecting black soot like particles all over the rear bumper. Should I be worried or is sort of thing common with a F/I Z?

 

It seems to be common imo. You want to run a richer tune then a NA z and you probably have no cats either. Rich = black smoke, richer = more black smoke.

My bumper has a medium amount compared to my buddys james TT z. His bumper gets dark in a hurry. Both of us have redlines so its easy to compare.

 

I get that black schmutz on the back of my bumper. Always thought it was from not having the cats on and the extra fuel being used under boost.

 

you sure this isn't blowby?

 

im not sure what it is, that is why i am asking.

 

i have (had) cats and would get it too. Little black particles FTL.

 

I get that also... I keep my rear bumper waxed all the time, this way is easy to clean...

 

MY Evo was doing the same when it was running super rich...have a TP on it didn't as well.

 

I think it is pretty common for FI, especially if you have delete pipes.

FWIW, mine seems to be a little worse in the colder months vs. the warmer ones. Not sure if thats because of the FCON adding fuel for the colder climate or what, not sure.

I can say in regard to the soot, that Sharif's current FCON tune is MUCH better than the unichip tune I had when the APS-TT kit was first installed. With the unichip, the bumper was always covered with soot, even a day after washing the car. With the latest FCON tune, it takes several weeks before its really noticeable.

 

mine gets like yellowish / black.. I have no cats though.. im also N/A

 

Nexx.. Its normal..

 

Normal.....even my License Plate gets black from this stuff...I have to use rubbing compound on my rear bumper

 

+1...

 

ok, i feel better now. white car + exhaust soot = fail. small price to pay for the big smile on my face when i boost.

 

Nexx, Buy two rear bumpers one for show and one for weekly bs/drag..

 

not a bad idea... ive always like the chargespeed and ings +1 rears... hrmm... and i could paint it black so the soot doesnt show as much. that way i could also have the panda/checkerboard look.

 

Mine does the same thing... I found a solution to get rid of it easily though.. First use tar remover to get rid of the stains.. (Yeah, they stain too!! if you leave them unwashed for a while) Then wax the crap out of your rear bumper often where the black soot builds up.

 

One of my buddies got the clear 3m on his rear bumper so that when it turned black it was easier to get off. It also wont hurt the paint.

 

Nexx, the problem is that your car is white. Shows like a ****. Even our white GTR, running 4 OEM cats, collects the crap on bumper. I have to wash it off every 2-3 days, or my bumper looks gunmetal.

 

clay bar works well for getting it off. I have a repainted bumper and for some reason it gets rough and pouris(sp?) and the **** bonds to it over time, claybar it and wax it and its nice and smooth and a few months later its rough again.

I wouldn't use rubbing compound though imo