Ok first off I drive a 2000 civic si, mods are JDM b16a block, I/h/e, ctr cams, aebs IM, skunk2 TB, fuel reg and guage, Obd1 chipped p30 ecu. When I get on my car at WOT there is a huge amount of smoke that comes out the back end of my car. It eats gas like no other, I can't even get 200 miles to a full tank of gas. Even without the chipped ecu in the car still smokes heavily out the exhaust when I get on it. So far I have done everything that I can think of that would be the problem. I've took off my fuel pump, and fuel regulator. I've replaced spark plugs, O2 sensor, mass air sensor, pulled the injectors and cleaned them. Everything I have done has not seemed to help at all. I can't figure out what the problem is. I have another set of injectors that I'm going to try out today.

 

Stick a wideband on it and find out exactly how rich you are running.