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I've been running the Zeniths for about two months now. Overall very good, but they could be better. My current set up is 55 idle, 165 mains and 175 air corrections and 34mm vents from pcar911. I'm using a Innovate Motorsports wideband O2 sensor hooked up to a laptop for tuning.
What I have found is the Zeniths run rich at low power and lean out at high power. I biased my jetting to get ~12.7-13.1 at WOT 4000 to redline. Part power cruise is unfortunately at ~12;1 which explains the poor mileage. After doing some calcualtions, I figured out the Zeniths would run perfectly on a 3.0l with 31.5mm vents, but will have this characteristic rich to lean transition with the larger vents.
What we need are tweaked emulsion tubes to lean out the bottom end!
Anyone who has a extra set, I'd be interested in buying them ($30 +S&H). I'll make educated guesses based on Weber tubes. Run them in my car and see with the O2 sensor how they worked out...
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Mike
'82 911SC, SSI, 22/29 tbars, 22F/22R Adj swaybars, Bilstein Sport, Elephant polybronze & monoballs, Cambermeister bar, turbo tierods, Carrera oil cooler, front brake cooling ducts, Sparco Sprint 5 & Recaro SRD PAX seat, Teamtech harness, DAS Sport rollbar.
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