Fuel Question..
Fuel Question.. This is a question that has been on my mind for a while, hopefully we can figure something out..
Whenever I go to about 85%+ to WOT, my Car puffs out black smoke like it's running diesel rich. On all the runs that have been logged on it, it's running at a 12.9 A/F Ratio all through the Fuel Trims, and at WOT the Injectors are showing at 88% Duty Cycle, and it smokes like crazy.
This is the setup..
402 LQ4 Stroker with L92 Heads Milled .025", ~10.8:1 Comp. Ratio
L76 Intake, Holley 90mm TB, LS2 Rails and LS2 34 lb/hr Injectors
Cam: 243/247, .621/.612, 114+3 LSA, set at 32* Timing
Walbro 255 Fuel Pump, Lines running into Corvette Filter/Regulator, and single 5/16" Line going to Rails.
Right before I put it in Storage I had a Scanner on it and found the Right Side O2 Sensor out, I didn't think that would affect WOT performance, but a friend of mine says that plays a major factor with it, so I plan on getting new ones and going from there.
Anyone have any possible ideas why this thing looks like a Diesel at WOT, is it showing a false Duty Cycle reading and it's over-using the Injectors, or is it the bad O2 Sensor messing with it?
Whenever I go to about 85%+ to WOT, my Car puffs out black smoke like it's running diesel rich. On all the runs that have been logged on it, it's running at a 12.9 A/F Ratio all through the Fuel Trims, and at WOT the Injectors are showing at 88% Duty Cycle, and it smokes like crazy.
This is the setup..
402 LQ4 Stroker with L92 Heads Milled .025", ~10.8:1 Comp. Ratio
L76 Intake, Holley 90mm TB, LS2 Rails and LS2 34 lb/hr Injectors
Cam: 243/247, .621/.612, 114+3 LSA, set at 32* Timing
Walbro 255 Fuel Pump, Lines running into Corvette Filter/Regulator, and single 5/16" Line going to Rails.
Right before I put it in Storage I had a Scanner on it and found the Right Side O2 Sensor out, I didn't think that would affect WOT performance, but a friend of mine says that plays a major factor with it, so I plan on getting new ones and going from there.
Anyone have any possible ideas why this thing looks like a Diesel at WOT, is it showing a false Duty Cycle reading and it's over-using the Injectors, or is it the bad O2 Sensor messing with it?
Last edited by the_merv; Dec 9, 2008 at 02:22 PM.
