Wideband O2 readings

[dodj]

No, not yet. My carb has tons of replaceable bits, but right now I've been doing a lot of reading about carb tuning. It is acceptable at the moment, but I  want to alter the accel afr and figure out the 'off the throttle'  lean out that I have not been able to find an answer to.

[DeathProofCuda]

No, not yet. My carb has tons of replaceable bits, but right now I've been doing a lot of reading about carb tuning. It is acceptable at the moment, but I  want to alter the accel afr and figure out the 'off the throttle'  lean out that I have not been able to find an answer to.

@ dodj my recent tuning with a wideband has been very similar to yours.  My car was originally running AFRs in the 12 range pretty much across the board.  I have now gone down three jet sizes in the primaries and have the cruise AFR in the high 13 to 14 range, but am now getting a stumble and lean condition when I first mash the pedal.  I am now moving up in accelerator pump squirter sizes to address this issue.  My theory is that the overly rich primary jets were previously covering up this accelerator shot issue.  I still have some more tuning to do, but is has been raining here for weeks so haven't had much of a chance to get the car out.  Tomorrow looks good though, so will probably bump up the squirters from 33 to 35 and see what happens.

[dodj]

Recently put in larger idle air bleeds but I only went up two sizes from 70 to 72. Not a huge change but it did seem to create a more lean condition at 'tip in' when accelerating. Now when i accel briskly, it leans out to 15 or so briefly then settles into about 12.5-13. Cruise is around 14-15. Idle is around 13.7.
Don't know enough about carbs yet to know if this is power valve or squirter to enriched the tip in. Or pump cam..

[ClarkWGrizwald]

Don't forget that timing can make a big difference in your afrs too. Even without a carb change, moving the timing up or down can change AFR at idle, tip in, decel , wot etc.  Make sure you have a good vac source on the vac advance. And make sure you have no vaccuum leaks on the carb or intake or lines.

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