Dual Quad tuning tips?

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TheGreatPumpkin
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Re: Dual Quad tuning tips?

Post by TheGreatPumpkin »

rgalajda wrote: Mon Oct 31, 2022 6:35 am TMP Carbs wrote:
" I always run my carbs large in part because I can run superior atomizing boosters"

Can you elaborate on "superior atomizing boosters" are you referring to annular boosters?
Yes, annular or maybe down leg is what he's talking about
rgalajda
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Re: Dual Quad tuning tips?

Post by rgalajda »

Normally if you increase the size of the MAB from the stock size the effect may not be what you think would happen . The main booster will start up sooner. AFR will richen in the low flow area ( such as cruise ) but will lean as approaching high flow area ( high speed/ wot ).

Also if you richen the idle mixture screws this will also effect the cruise AFR / richer. Or the opposite if you lean the idle mixture screws.
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Re: Dual Quad tuning tips?

Post by TheGreatPumpkin »

Update: Engine seems way happier on ported advance and the 14 degree bushing (10 degree was suggested, I started conservatively). Idle is more stable, return to idle is dead-on consistent (heaviest MSD springs). However, I will have to retune IFRs and then, slowly, make sure all else is in tune. Thank you for the help!
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