What is a safe A/F ratio on a boosted b18c1 when sniffing from the tailpipe after a cat? My a/f graph was flat at 13.5 until 7k RPM when it dropped to 11

low 11's

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SHORACETEAM &raquo;</TD></TR><TR><TD CLASS="quote">What is a safe A/F ratio on a boosted b18c1 when sniffing from the tailpipe after a cat?</TD></TR></TABLE>

Any wideband readings after your cat are worthless.

the a/f will be a bit leaner on the tail pipe sniffer, but it should be too drastic. if the dyno shop cleans there dyno wideband often, then it should read fine. when my car was all motor and i still had the cat, the diffence in a/f from the collector to the tailpipe sniffer wasnt that off

How effective was your catalyst at that point in time? You did, of course, check it when new to make such claims?