I notice the other day when I WOT I see black smoke flying off from my exhaust.

Is it good or bad sign for FD.

Mods:

Petitt Fuel Computer that was remapped to run rich.
HKS exhaust
Downpipe
intake

Thinking could be running rich that's why???

 

it's probably just a bunch of carbon build up from your motor, it's good to clean it out and going WOT is pretty much the best way to do it

 

Nothing to worry about. Just a little carbon and fuel..

 

yeah I figure.
Compression did turn out good. Guess I'll just have to start premix and WOT more often, because I normally shift at 3 to 2.5 k rpm. that's prob. why.

 

yeah I drive like that most of the time too, I'm always shifting before 4K, I get it on the highway to clean it out on the weekends though

 

hmm thats wierd i never get that and my car has been premixed for quite some time now

 

If it does this everytime the engine revs high, with the same amount each time, then I doubt its carbon. I'd bet its fuel.

 

Why did you remap the stock ECU to run rich? It already runs considerably rich.

 

I think he just means he has a Pettit ECU.

fd3s_rx7,

ijneb is right. If it's happening ALL the time you step on the gas, something may not be right. If you only see it once in a while, it's probably just carbon build up.

 

yeah Mahjik is correct. I have the Pettit ecu not my stock.

and yeah it only happens once in a long time.

 

Premixing would not cause black smoke.

 

all smoke = bad

 

Please elaborate.

 

I thought the Pettit ECU was a re-chipped stocker.

 

My car smokes all kinds of colors. WOT, its gonna be fuel. I can leave a hell of a cloud.

 

My car smokes black smokes too.

Mechanic says nothing to worry about cause normal for FD to be like that.