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Dirtyowlnumber4

Weber tuning issue A14

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How much will an air horn increase air at idle?  I'd like to increase the idle speed, but my idle speed screw is just beyond maxed out.

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None at all. It may help extreme high revs.

 

Idle speed screw should be almost closed. Maybe you have something else.

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My bad, I meant that it is at 1.5 turns in and at low rmp (no tach). I'm considering a .040" hole drilled into the throttle butterfly(s) opposite of the progression holes. I put a .008" feeler under the secondary throttle stop and it appears to open the second idle circuit (richer). When I used a .005" feeler it appears to do nothing.

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The only air horn I know of that's available for a DGV is super expensive and will only fit inside a very tall air cleaner. You need to be sure to use a filter that is tall enough or you will disrupt the air coming into the carb. Preferably a foam filter from someone like ITG so it can suck air from the top as well as the sides.

 

Super expensive setup and probably not worth the effort.

 

We did play with different types of DGV air cleaners on the dyno once, and using an aluminum round air cleaner adapter, we found that if you raise the adapter closer to the opening of the carb, you can increase HP. Not by much, but it was measurable.

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