I have a modded 1997 LS1 with ported 243 heads, ls6 intake, 228/232 cam, Vararam, and most importantly a set of LG Street LT's with cat deletes, X pipe and z06 Ti's.
My problem is that I can't for the life of me get my 02's to "switch" properly. It's almost like I dialed in the tune so well (my ltft's are all -.08 in most of my operating range) that they're not hunting around in different cells and changing the fuel mixture.
I have tried replacing the sensors multiple times, they will usually not throw codes for a few days but lately they've been starting to throw codes within one drive cycle. Wiring is good, heater fuses are fine. O2 readings DO oscillate properly (approx .2 to .8 volts) but definitely not much at an idle. I'm sure the LT's are causing the problem by locating the 02's further from the exhaust and allowing it to cool (and there is less flow thru the same area due to the larger diameter). I have tried the hold drilling trick, but there was zero change.
The 02's work fine and peg right around 880-900mv when at WOT (which my LC1 says is approx 12.5-13:1 afr) so I know they're giving proper readings.
Any ideas to play with the tune to get the 02's a bit livelier? I'm thinking maybe adding spark...but I know too much can be dangerous.