Air/Fuel ratio, is there a quick answer? |
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Air/Fuel ratio, is there a quick answer? |
malcolm2 |
Feb 5 2017, 05:50 PM
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#1
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Advanced Member Group: Members Posts: 2,745 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States |
OK, I have been tinkering with the new-to-me AFM on my 1911cc engine all weekend. I have adjusted the spring about 20 teeth CCW to get to this point.
I have been using an A/F sensor and gauge. can someone tell me, or direct me to a chart/table of what A/F I should be shooting for on my daily driver. The last adjustment of the CO screw has left me here: I have always had a strange idle situation, so lets ignore that for now. any normal adjustments to reduce the idle at normal operating temp eventually stall the car. A problem for another post. (IMG:style_emoticons/default/blink.gif) the idle is high.... at 1200 the A/F is a smooth 12.2. I found a long hill and drove up it at about 3800 rpm and the A/F was 12.5. thoughts? |
porschetub |
Feb 6 2017, 02:12 PM
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#2
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Advanced Member Group: Members Posts: 4,698 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
Doing final tune on my Zeniths,dropping idles down a touch as well as mains,I always run a little fat on the jets with any aircooled engine.
I don't really trust plug colour to much with the modern fuel. Mark what is the best performing/value AFR kit to use?,would like to install one,the 911 engine is a hungry beast on carbs would like to get that the best I can. |
Mark Henry |
Feb 6 2017, 05:13 PM
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#3
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
Mark what is the best performing/value AFR kit to use?,would like to install one,the 911 engine is a hungry beast on carbs would like to get that the best I can. You want one with the biggest LED numbers, a tiny dial or numbers are hard to read on the fly. I'm not sure what's best now, my O2 WB is a WMS that I bought 10+ years ago and has been solid as a rock. They stopped making them because they couldn't compete against the cheap china made units, it cost $500 back then. It's small but has 1.25 tall LED numbers. I've heard good things about the PLX and if you're a techie they have a bluetooth for your phone or tab. Like my WMS it has datalogging, but with the bluetooth option you can do this right on your phone. But there's also a real cheap one on evilbay for $135 Beware of the $80 Inovate "deal" on evil bay, it doesn't have the lambda sensor... the most expensive part. |
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