AFR vs Lean Best Idle

1980-1986 Datsun 720 forums. All 720-specific topics and discussion can be found here.
matrophy
Posts: 2
Joined: Tue Oct 08, 2019 1:55 pm
Car: 1986 Nissan 720 with Z24 carbureted engine. 64000 miles when purchased in 2019

AFR vs Lean Best Idle

Postby matrophy » Mon May 31, 2021 3:49 pm

I have an 86 720 with z24 and I installed a Weber 32/36 and an AFR gauge (actually Lambda since we have E10 here) and I am wondering if I should go by the best Lambda reading or the best Lean Best Idle by ear when setting the idle mixture. Lean Best Idle by ear is at around .85 but about 1/8 turn brings the reading to 0.92 - 0.95 but a little less smooth idle. Even more of a turn gets it to almost 1.0 but it's a little rougher still.


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