Modified tune to leave rear 02 sensors enabled

sgtbigmac · 10-10-2009

For ten bucks, Breenspeed is e-mailing me, on 16 Oct, a new tune so that I don't have to "return to stock" once a year for my Massachusetts state insp. I'll be smoking a victory cigar on the 16th !

mustangdave2008 · 10-10-2009

I've always wondered how much this would affect performance. Did they say?

sgtbigmac · 10-10-2009

Quote:

Originally Posted by mustangdave2008

I've always wondered how much this would affect performance. Did they say?

Breenspeed said that the modifaction will only affect the 02 sensors ....no performance change.

**stlwagon** · 10-10-2009

Rear O2 sensors only monitor catalyst efficiency. They do not control anything.

duckbubbles · 10-10-2009

Quote:

Originally Posted by stlwagon

Rear O2 sensors only monitor catalyst efficiency. They do not control anything.

Can anyone tell me why most (if not all) of the tunes disable them? I believe I would pass emissions testing if they were turned on.

Frank

**stlwagon** · 10-10-2009

Quote:

Originally Posted by duckbubbles

Can anyone tell me why most (if not all) of the tunes disable them? I believe I would pass emissions testing if they were turned on.

Frank

I don't really know why. If you have cats, they should remain on.