lopez14

I had my friend rev my s for me while I was outside to see what it sounded like from a different point of view, and I noticed when it recede at higher rpms like at 6 or 7k and above it through out a little bit of black smoke. My car is all stock execpt a custom exhaust which includes a 63mm tp with 2.5 piping all the way back to a single greddy evo 2 exhaust (no resinator) and an intake. Anyone know what that black smoke is about or if its dangerous? Does that mean I'm running lean or rich or something? Thanks!

rob-2

Was it black or grey? Black is a bad burn either rich or no cat. Unless you're consuming oil, forget about it.

lopez14

I would consider it black, so then its normal since I have no cat?

GravyRobber

It's normal. No need to worry about it

PrisonerOfDoom

Perfectly normal. Black smoke = fuel.

s2000maniac

what about white-ish or blue-ish?

rob-2

white coolant
blue oil

realblag

He has a test pipe. It is unburned fuel vapors.