Air fuel ratio on the dyno

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May 21, 2007 | 07:30 AM

SHORACETEAM

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From: Eugene, OR, USA

Air fuel ratio on the dyno

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

May 21, 2007 | 07:36 AM

jmm96gsr

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From: Lower East Side Holly, PA, usa

Re: Air fuel ratio on the dyno (SHORACETEAM)

low 11's

May 21, 2007 | 07:47 AM

Joseph Davis

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From: ashEVILle, NC, USSR

Re: Air fuel ratio on the dyno (SHORACETEAM)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SHORACETEAM »</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.

May 21, 2007 | 08:51 AM

boosted k20

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From: new york, n.y., u.s.

Re: Air fuel ratio on the dyno (Joseph Davis)

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