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Tuning lean cruise, target a/f

376 Views 2 Replies 2 Participants Last post by  Jon01
How lean should I be aiming for when getting a pseudo lean cruise tune established?
Right now the wb is reading right around stoich, varying a bit each way. Is it safe to go leaner under light/steady throttle conditions between 1600 and 2k rpm and 50kpa on the MAP?
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I have an 04 so I get the real lean cruise from the PCM.
You can go pretty much as lean as you want, under very low MAP settings.
I keep mine in the 1600-2400 range, .32G/cyl and lower. Tapering off to the sides, and higher in the MAP region.

My wideband reports anything from 18:1 to 15.5:1 when in lean cruise, depending on which cell I am in.

one thing to keep in mind, with you doing psuedo lean cruise, you may have some throttle transistion problems at low speeds, so keep an eye on it.
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