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? |
pete000 |
Mar 5 2017, 12:56 AM
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#2
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Senior Member Group: Members Posts: 1,885 Joined: 23-August 10 From: Bradenton Florida Member No.: 12,094 Region Association: South East States |
I picked up one of the PLX Blue Tooth AFR systems and it works really well. Display is easy to read although I do wish it had a record feature though. I had a bung welded in my Bursh muffler at the main collector as to read all four cylinders.
Did a small drive today for an hour on some hills here and was getting pretty consistent readings in the 15s cruising fairly flat roads, under WOT saw it dip into the high 14s. Climbing with a fairly heavy pedal it would also dip into the 14s. Coasting down hill throttle closed it goes to full lean condition as expected. After following this thread, sounds like I am a tad lean? Should I be in the 13s under WOT and 14s for cruising vs 14s and 15s I am seeing now? I do not have a CHT gauge, so not too sure what the heads temps are. Might have to crack the lid off the flapper box and ritchen it up a few teeth. I have read a lot of adjusting the Bosh AFR over on the SAMBA. My car is also a 74 1.8 L-Jet https://youtu.be/owYGugwTguE Attached thumbnail(s) |
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