Smoke

[Chino]

hey guys i need to ask if anyone of yew fellas would know why every now and then i get smoke out of my exhaust when gunnin it... never at idle

i have no restrictions no cat no resinator no nothing... would this be why and i have no problem???

[Endorean]

I have heard that when you 'gun' it, the engine management system puts more fuel into the engine to protect it, so you'll get a puff of black smoke when you hit high rev's..

N/A cars also do it as well, when you drop back a gear and plant your foot, a small puff of smoke will blow out the back.

That's what I've heard, I'm not sure, I'm no mechanic...

[nismoman18]

no cat ? ur running around illegally man. But thats the main reason man, cos all the shit is going straight through its just natural man

[Demon Dave]

what color is the smoke?

It's normal to see a plume of black smoke when you gun it, usually this is due to overfuleing (and if the exhaust is hot enough, the excess fuel will ignite and you get the flame thrower exhaust effect! ).

Blue smoke, however, isn't good...

[nismoman18]

yes blue smoke is a big no no

[adam 32]

black smoke = carbon from unburnt fuel. if you have a std ECU this is probably the problem.

white smoke = turbo seals are gone or going as oil is leaking through turbo somehow

blue/white smoke = excess blow by from engine. possibly worn piston rings causing oil to escape through exhaust manifold then out exhaust.

best way to tell is, are you losing oil? if not then its probably carbon, if you are then investigate further.

or get someone to drive behind u and tell u what colour the smoke is when u nail it

[nismoman18]

theres also brown smoke with chunks or ceramic plates hehe thats when ur cats decided to blow up

[Ash]

is there a way i can check if my cat has been gutted or is high flow?

[adam 32]

take it out

it should only be a 2-bolt flange and will take 5minutes to do

[Ash]

factory cat isn't 3 inch is it? either is factory dump?

[nismoman18]

2.5 i think ? mine came 2.5 but its non turbo dont know if they are different

[Ash]

thanks!

[WazR32GTSt]

if its carbon thats coming out (thus black smoke) then your exhaust tip will also be very black inside. check that out as it can be hard sometimes to get a good idea of the colour simply through the rear window

[nismoman18]

yeha my tip is very black when im driving around town. come track days and it gets cleaned lol