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enkeivette · 08-16-2009, 10:19 PM

For reference:

The air bleeds affect the AFR curve and the upper end of the AFR range, while the jets affect more of the mid rpm and only the AFR.

So if the air bleeds are sized incorrectly, the AFR might vary in the upper rpm range.

If you run out of tuning adjustment and find yourself trying to lean the primary jets to lean the part throttle acceleration while trying to keep the WOT fatter, you may want to drill out the power valve channel restrictions on the primary side. Stock on my metering block is .059, .078 (5/64th) is a popular starting point. This will allow you to run leaner primary jets while keeping a good WOT AFR.

Make sure you do this only after you've exhausted all other possibilities. And do not drill too deep, use a pin to measure the depth and then tape off your drill bit.

08-16-2009, 10:19 PM	#2
enkeivette Super Moderator Join Date: Dec 2007 Posts: 6,850 Tweet	For reference: The air bleeds affect the AFR curve and the upper end of the AFR range, while the jets affect more of the mid rpm and only the AFR. So if the air bleeds are sized incorrectly, the AFR might vary in the upper rpm range. If you run out of tuning adjustment and find yourself trying to lean the primary jets to lean the part throttle acceleration while trying to keep the WOT fatter, you may want to drill out the power valve channel restrictions on the primary side. Stock on my metering block is .059, .078 (5/64th) is a popular starting point. This will allow you to run leaner primary jets while keeping a good WOT AFR. Make sure you do this only after you've exhausted all other possibilities. And do not drill too deep, use a pin to measure the depth and then tape off your drill bit. __________________ I <3 forced induction. Last edited by enkeivette : 08-21-2009 at 04:41 PM.