Scriber

I searched and there were no real definitive answers...just general opinions that it should be higher than 13 and less than 15.
If it matters car is na with cai/exhuast/pulleys.

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ForTehNguyen

stoichiometric ratio (sp?) is 14.7 for air to fuel ratio mixture

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2006 Lexus IS350


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buh_buh

I always thought ideal A/F was around 12.8:1.

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4bidden

For a street car I'd do like 13.5:1.

I think 14.7:1 is pushing it for a street car.

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-Jeremy | Forbidden Motorsports

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TimeRacer

You CAN run leaner if your O2 sensor is out the tail pipe. Though I still wouldn't push it past 14:1. The generally "safe" area is around 13.5 however.

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MugenPoweredLude

most dyno plots ive seen are around ~13.5

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marcucci

Holy Christ. If they are using a "sniffer" in the end of the tailpipe, peak power will be found around 14:1. It's generally safe, too, on the H22. Anything from 13.5:1 and 14:1 should be your target. Any richer than that and you will lose power, and leaner and you run the risk of going too lean.