123 ignition pros -cons ? |
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123 ignition pros -cons ? |
jims914 |
Apr 3 2023, 11:15 PM
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#1
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Member Group: Members Posts: 126 Joined: 11-March 11 From: Tempe,AZ Member No.: 12,816 Region Association: Southwest Region |
Anyone have any Pros or Cons for a 123 ignition D-jet tune-4-r-v-p unit for 74 2.0 ?
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iankarr |
Oct 27 2023, 11:21 PM
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#2
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The wrencher formerly known as Cuddy_K Group: Members Posts: 2,512 Joined: 22-May 15 From: Heber City, UT Member No.: 18,749 Region Association: Intermountain Region |
Jake Raby taught me a simple method. First, follow the directions for installation, which will get you to a point where the car runs. Set a curve point for 8 degrees @ 1K RPM, a point for 27 degrees @ 3000 rpm and a point for 27 degrees at 5K. Load that curve into the 123 distributor. Then hook up a timing light, cap off the vac advance and rev the engine to 3K RPM. I like to aim at the notch on the flywheel. Rotate the 123 until you’re showing 27 degrees BTDC @3K and then lock the unit down. The app and dizzy are now synched and you’ve approximated a simple stock curve. Now the fun begins. Drive around and see if there are any flat spots in acceleration. Make note of the rpm’s where the power seems to dip. Add points there to fine tune the advance. You’ll probably need a little more advance a little earlier. You may also need to tweak your idle advance a bit until it runs smoothly. Of course the condition of your engine, altitude and a bunch of other factors come into play. I live at 6,000 feet and my 2056 loves 10 degrees @ 1K and 30 degrees at 3,500, with a bunch of unevenly spaced points along the way.
I gotta make a video on this. |
nivekdodge |
Oct 28 2023, 09:13 AM
Post
#3
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Member Group: Members Posts: 262 Joined: 28-August 21 From: Pittsburgh Pa Member No.: 25,860 Region Association: MidAtlantic Region |
Jake Raby taught me a simple method. First, follow the directions for installation, which will get you to a point where the car runs. Set a curve point for 8 degrees @ 1K RPM, a point for 27 degrees @ 3000 rpm and a point for 27 degrees at 5K. Load that curve into the 123 distributor. Then hook up a timing light, cap off the vac advance and rev the engine to 3K RPM. I like to aim at the notch on the flywheel. Rotate the 123 until you’re showing 27 degrees BTDC @3K and then lock the unit down. The app and dizzy are now synched and you’ve approximated a simple stock curve. Now the fun begins. Drive around and see if there are any flat spots in acceleration. Make note of the rpm’s where the power seems to dip. Add points there to fine tune the advance. You’ll probably need a little more advance a little earlier. You may also need to tweak your idle advance a bit until it runs smoothly. Of course the condition of your engine, altitude and a bunch of other factors come into play. I live at 6,000 feet and my 2056 loves 10 degrees @ 1K and 30 degrees at 3,500, with a bunch of unevenly spaced points along the way. I gotta make a video on this. Thanks Ian Kevin |
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