04-17-2006, 10:00 AM
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CC Member
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Join Date: Oct 2003
Location: Bainbridge Island,
WA
Cobra Make, Engine:
Posts: 709
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Not Ranked
Jake...there's no need to balance your idle speed screws for the pri and sec. throttle blades. You just need to open the sec. side just a tick to allow fuel to draw from the fuel bowl. If your plugs still look too lean after a good drive at all engine speeds, bump you jetting to 75's on the primary side. No need to bump up both pri and sec., since most of your driving is on the primary side. To sort this all out, I recommend some chassis dyno time and focus on your part throttle and full throttle A/F ratios. Ya gotta get that right first, HP and torque will follow a good A/F ratio. If you can get somewhere around 13.5-14.0 A/F at part throttle on the chassis dyno, and 12.5 - 13.0 at WOT, your in the ballpark. These two measurements will tell you if you need to bump up the primary and/or secondary jets too.
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