for no other reason but to archive for the future I can surely state the addition of the 2 out exhaust has made all the difference in the world. has improved AF numbers across the board and more importantly has made conventional tuning techniques significantly more achievable. with the single out I could turn idle screws to & fro with little engine idle/running change, but with the new muffler the tuning inputs are much more identifiable.

far from saying I'm done & all learned up. but all of a sudden all the research & jetting changes ive done the last few months has become much clearer. it's been a pain, but I'm better for having gone thru it....;)

Added comment for the archive:

Left and right exhaust wideband O2 sensors.

I have a wideband O2 in the left. Really helps tuning. I am adding WBO2 to the right. Should give me all the data I need to get the most out of the carbs.

funny you should mention that. ive been monitoring the driver side bank from the outset. I have recently have bought a second 02 sensor and 8' wire harness that goes from the sensor to gauge. for yesterdays tuning effort I simply swapped the single installed harness from left to right side while tuning each bank and it worked well.

the plan I'm researching is running the second sensor to gauge harness to run both sensors from a single gauge with a switch, or maybe two if required. my plan is to jump the sensor heating wires, power & ground from the gauge to both harnesses to keep both sensors being heated constantly while switching back & forth to the data wires in the harness. trouble is I'm finding conflicting wire ID on pin layout drawings...


comment?

AFR Thoughts
 

Glad you are making headway tuning and learning along the way.

I considered dual wideband sensors for a while (the LM2 can connect 2 simultaneous). I opted not to bother with it, since I reasoned that the wideband pretty much let me tune what I wanted from a single bank, but didn't really provide that much more insight if I connected the other bank.

Here's my thoughts:
- The wideband is essential to getting the right sized jets and the right emulsion tubes, but isn't really all that helpful in getting each carb fine tuned.
- Once you have the right jets / emulsion tubes, tuning becomes a matter of adjusting each carb so that they are all performing equally.
- The wideband averages the output of 3 cylinders / carbs, and though it can give you an indication if all 3 are preforming equally - it's still an average.

In spite of this - I think it would still be nice to see that you have the banks of carbs equalized, which is absolutely do-able with dual widebands.

Press on...

Thanks,

Gordo