 Specific question for those that have a 6, with a 123 unit and webers |
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| Cfletch |
 Apr 24 2026, 03:13 PM
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Member  Group: Members Posts: 233 Joined: 30-January 14 From: Santa Barbara Member No.: 16,941 Region Association: Southern California  |
Sorry, pretty specific question for those with a 911 engine, 123 ignition, and weber carbs.
I have 3 the above, and was curious about the using the MAP curve. I have the PMO manifolds and I believe that has a plugged port on each side for vacuum, and I'm not sure if that's the correct port to use to get a vac signal to the distributor. Additionally, what is the real benefit to this. From what I have seen on Pelican Forums is that it may help with getting MPG/efficiency improved. How does it do that? Working on getting my carbs more dialed in and working on some mid throttle lean symptoms, but also wanting to play around with this port when the time comes. Just loaded Ben's curve he has posted a few times in the pelican forum and have yet to try it. Noticing lean pops from carbs at ~3k rpm on Freeway and holding around that RPM. When accelerating I get no pops and smooth accel. It just pops when essentially maintaining 70ish MPH in 5th. |
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| 930cabman |
Apr 24 2026, 03:28 PM
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Advanced Member Group: Members Posts: 4,623 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States 
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QUOTE(Cfletch @ Apr 24 2026, 03:13 PM)  Sorry, pretty specific question for those with a 911 engine, 123 ignition, and weber carbs. I have 3 the above, and was curious about the using the MAP curve. I have the PMO manifolds and I believe that has a plugged port on each side for vacuum, and I'm not sure if that's the correct port to use to get a vac signal to the distributor. Additionally, what is the real benefit to this. From what I have seen on Pelican Forums is that it may help with getting MPG/efficiency improved. How does it do that? Working on getting my carbs more dialed in and working on some mid throttle lean symptoms, but also wanting to play around with this port when the time comes. Just loaded Ben's curve he has posted a few times in the pelican forum and have yet to try it. Noticing lean pops from carbs at ~3k rpm on Freeway and holding around that RPM. When accelerating I get no pops and smooth accel. It just pops when essentially maintaining 70ish MPH in 5th. I have 2 out of 3, a 2.7 911 engine with Weber 40IDTP carbs. Also experiencing some popping. Currently I am looking into going with 60 idle jets and/or cleaning the idle passages, also retarding the spark a few degrees. |
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