strange behaviour O2 + other small problems

[Gummisko]

hi!
i got my car tuned a little bit last week, only street tune, will get a dyno tune in a week or 2.
but we got some strange behaviour on the o2s that we cant find an explanation of.

only at the beginnign of a trip and when cruising... o2s stop working and first my WB show super lean about 16-17 then shifts over to Rich about 13 and then after a while they start working again...?

and is there a easy fix for deacceleration exhaust pops?

the tune is VE disabled and LTFT disabled


and to my broken histograms

no 1 and 2 is all 0.0 in the left column = Main spark advance and knock retard

car info:
Nissan Silvia s14
LS2 + T56 from a 06 GTO
Longtubes 1 7/8" 3" into x-pipe into 2.5" true dual.
comp xer281 cam, rods, dualspris, trunnion,
mildly ported heads, intake, TB


Thanks
///Janne

[wetcoast]

only at the beginnign of a trip and when cruising... o2s stop working and first my WB show super lean about 16-17 then shifts over to Rich about 13 and then after a while they start working again...?

I'm seeing this once in a while on one of my tunes and I'm interested too in the cause. My commanded lambda at the time is 1.0 but the wideband is seeing and AFR of 16ish. My guess is DFCO but at the time I wasn't decelerating. My guess is it's somewhere in the DFCO settings.

[Russ K]

Disable the CAT test and the Post O2 test.

Russ Kemp

[Gummisko]

Disable the CAT test and the Post O2 test.

Russ Kemp

thanks. so far no strange o2s...=)



is there a fix for my spark histograms?