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LS3 Grandsport with Headers - tune & timing questions

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LS3 Grandsport with Headers - tune & timing questions

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Old 07-13-2018, 09:04 AM
  #21  
schpenxel
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St. Jude Donor '15
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Originally Posted by truth.b View Post
I bought a wideband and installed it today and so far here are my take aways:
- idle AFR is bouncing from low 14.xx to high 15.xx before it roughly somewhat stabilizing @ 14.5ish
- a few half to full throttle stabs showed an AFR of 12.2
- with cruise set on a relatively flat road the AFR moved around alot
It's supposed to bounce around like that when cruising or at idle, that's on purpose. Should average right around 14.7 but will go a few percent above and below that.

Narrowband O2's can only really say whether it's rich or lean, but not how much, so the computer goes back and forth adding and subtracting fuel to make the O2's "swing" from rich to lean, rich to lean, rich to lean, etc.
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