Quote:
Originally Posted by rod
I understand most everyones O2 #s will be somewhat different due to all the variations. however there must be a # + or - where your engine will achieve best idle.
FYI, I use a Holley 600 on my 327 Chevy. not a real legal 350 hp, but close. Vegas is closed for the summer, so I am trying to get several things right.
Rod in AZ
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An O2 sensor, located in the collector of a race car, normally indicates very Lean at idle idle. The added overlap of a race cam, causes the exhaust to "pulse" in & out of the collector. Pulses pulling clean air, containing oxygen will give bogus Lean numbers. I bought a 24" slip joint with a 45 Bend in it for setting my idle air/fuel ratio in the car. On an engine dyno that should not be an issue, with the exhaust system they use. Only with open headers. Should be no issue in a vehicle with full exhaust. I hope the Lean reading is what you were referring to. The open collectors are the reason you normally would not idle one in Closed Loop.