Tunnel Ram Tune

Mattax said

You guys argue over the effect of air bleed at circuit initiation like its a yes or no.
The reality is that it depends.
Before messing with the HSAB to tweak the main circuit's start up characteristic, first make sure its doing its job at the top end.
Then with emulsion correct and HSAB very close to providing the correction needed, a small increase in size should start the mains a little earlier and not cause a lean drift at high rpm WOT.
However this depends on how the air is bled into the main well.

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I agree. As I’ve said before, as a GENERAL RULE (and 99% of the time) a bigger MAB starts the mains sooner and makes the fuel curve leaner at RPM. Bewy doesn’t get that. You have to be way off in emulsion to get a smaller MAB to start the mains sooner. Way off. I think the OP a said he has two .028 emulsion bleeds in the 1-3 position. That’s going to be fairly close. So a bigger MAB will start the mains sooner no matter how many times Bewy says it won’t. He read what Mike Urich wrote and we know he was never wrong.