Originally posted by warmonger:
When I went to the dyno with NO changes to the car, the wideband O2 sensor read 12.25:1
warmonger
Do you have converters on your car? (1-3?)
If so then wideband readings are irrelevant (for the most part) since the cat's scrub the A/F ratio before the tailpipes.
Not picking on you per se; I've brought this fact up before...
My 02's read around .86v now. (I run at .90v with the S-AFC until I have it dyno-tuned) Before the last 2 mods it was around .87-.88v and last spring before the exhaust it was .90v
So that denotes it is getting leaner and leaner.
For the record the my dyno was around .90v range. It showed high rpm flutter for (as of yet) some undetermined reason. (KKM, Advance, fuel???)
I didn't have them run a wideband O2 at the dyno because the shop owner himself said it was worthless with cats. He could have easily just hooked it up and charged me for it.
It will always read about the same on any car with cats even though it's not truelly the same before the cats.
