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Old 10-05-2009, 05:33 PM   #11 (permalink)
aussie_modder
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Join Date: Aug 2008
Location: Hunter Valley, Australia
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Big_Bird - '79 Holden (GMH) Kingswood SL
90 day: 18.96 mpg (US)

Girl's Car - '05 Holden (GMH) Astra
Last 3: 40.33 mpg (US)
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Carbs are interesting beasts

What i was getting at is that with the existing jets, fitting a WAI would cause a richer burn (less O2), however a CAI would net a leaner burn (more O2).

If power can be sacrifised, the question then becomes, should try and take advantage of a wider throttle opening for reduced pumping losses????? by using a smaller main jet and WAI? (less manifold vacuum at cruise)

or is it more beneficial to obtain the desired power with the lease throttle opening? (more manifold vacuum at cruise). keeping factory standard jets (or one bigger) and utilising a CAI and/or RAM air? In essence, forced aspiration seeks to do exactly this (more oxygen in the intake charge) ...... often yielding a net gain in low down torque.

Would this latter scenario also compliment a higher load scenario (i.e. taller gearing), moreso than a WAI?

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