Hello,
I was driving in front of my friend one night and we were both going at high speeds together and he noticed black smoke come out my mufflers. I didn't pay attention as It didn't do it again for a while. Recently this has happened when the vtec kicks in. It's happened atleast 3 times this past month. The car drives like new but what could be causing this? Any suggestions?

 

do you have an exhaust, header, test pipe, or AFC?

 

i've read that it's a result of our cars running rich. black smoke under hard acceleration i wouldn't worry about.....blue smoke, that's bad news.

 

this is totally normal. every S2000 i've ever been behind that accelerated fast did this when shifting.

 

you should see my buddy's cl type S. worse then the s2k

 

totally normal.. check your fluid levels often

 

I have the same problem. A bunch of smoke from the exhaust when I hit VTEC. But you say this is normal?

 

Dont you worry.

 

Ya sure? It does worry me though.

 

Its the carbon buildup being blown out. Its perfectly normal. The longer you havent VTECed, the bigger the cloud.