I can't find anyone that sells unleaded racing fuel so I can check if this knock is false or not. So I was wondering if I use leaded racing fuel, can I just disconnect my oxygen sensors jump on the highway and see if my knock goes away at WOT? or is this a bad idea, Can the racing fuel ruin something else? Can running WOT without the oxygen sensors hurt anything? I don't have cats by the way.

 

You can't just disconnect the O2 sensors. You have to remove them. The lead will contaminate them if you leave them in place. A small amount of leaded fuel probably won't destroy them, but you are taking a chance if you don't remove them.

When you disconnect the sensors, the PCM will stay in open loop. If the tune is good, and its been driven long enough in closed loop to fully develop the long term fuel corrections (BLM's) you may get lucky and it will run the same as it did with the O2 sensors connected. Potential problem is, you will be running in Cell 18 WOT, and previously, with the O2 sensors connected you might have been running in Cell 15. The differences in the BLM's between the two cells will affect the WOT A/F ratio.

 

I'm an idiot, I meant remove them. Not sure if this is a question you can answer but will WOT a/f ratio typically run richer or leaner in Cell 18? richer is definantly better I would believe or can it actually run extremely rich? thanks for your help by the way.

 

djm_e22:
You might try adding some pure Xylene or Toluene (get it at a paint supply or possibly the paint dept at a Home Depot or Lowes) to your gas. I can't find my reference data but ISTR that they both have effective Octane ratings of about 110. So 1 gallon in a 10 gallon total would bump a 92 rating to nearly 94.

 

Cell 18 BLM's appear to be mathematically derived from the values in cells 01-15, so its not likely that they will match Cell 15. Could go either way.