Well I got the front float set to 16mm today and it does seem to run a little bit better. I am not sure what this equates to as far as level inside the float bowl, but it was a significant change from the last setting I had used.

It is still a bit hard to start after driving it for awhile. I just have to press the gas just a bit to get the engine to catch.

Both carbs now idle up slightly and then drop in revs after lifting the pins slightly so I am at least in the ball park. Too bad the colortune still shows rich.

The colortune isn't the final word on whether the carbs are just right. It's purpose is to get you into the ballpark. In the end, it takes just the right about of voodoo to get the SU's right. It's a subjective call, not a value that can be measured (unless you have a dyno, that it).

Im using a wideband o2 sensor. In my experience I have found that if you adjusted the mixture on an SU to be correct at idle you will most likely find that your car is too lean under a load at rpm. At least thats what I have found. My car runs best when the idle mixture is rich(about 10.3:1 air fuel ratio). Under load at higer RPMs the mixture settles in at about 12.5:1 to 13:1

Edited September 20, 201014 yr by whamo