An Official 123 Ignition Distributor Curve Thread, figured this would be helpful Options

[iankarr]

Hi Guys,

With more and more of us switching to the 123 Ignition distributor and all the questions coming up about how to set the curves on the bluetooth model, I figured I'd start a thread where we can all share tips and screen grabs of what works for our cars. I'll go first.

Jake_Raby taught me a simple method for getting the app and the dizzy in sync.
– First, follow the directions for installation (using the green light), 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.
– 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 here's what my freshly built 2056 with 9590 cam in my bumblebee is happy with: (Note that I've zeroed the MAP curve. I haven't been able to see a difference using it, but am still experimenting. If someone can offer suggestions for that, please do!)






I have a new unit for my ravenna car and will make a full video on that when I install it this winter. Will post a link in this thread when ready.

[mkinne]

Thanks for the feedback @Lockwodo

Quite certain the MAP curve was (and still is) disabled. Hopefully it really is off when "disable" is selected, without having to zero all of the points. That could lead to some confusing results.

I did do some more test runs after the previous post and ended up with the curve below.
With this setting, didn't notice any pinging while driving the same route as before and still on the same fuel.
(IMG:http://www.914world.com/bbs2/uploads_offsite/photos.smugmug.com-1406-1701038227.1.jpg)

Then got out for a long drive yesterday with some SoCal folks.
Never heard any pinging (though it was often kinda loud in the cabin) and car seemed to run pretty much normal.

I would like to try a little more advance around idle, but...
Right now the car wants to idle at ~1100 rpm (according to 123 app) after fully warmed up, which is why I set the advance constant from 500 to 1200. I think this helps with the steady idle. More advance seems to make the idle higher and if the curve is ramping in the idle zone, then the idle isn't as steady.

More advance at low rpm also seems to make it a little harder to start/turn-over. Maybe firing before the starter motor gets the engine properly spinning?

-M