123 Ignition Vacuum Adv, Learn me on some vacuum Options

[nditiz1]

Ok so I'm currently running the 123ignition dist on my 2056 with dual webers. I read the instructions and don't understand the mapping. I also don't know how it all works together. Can someone educate me on the vacuum adv and what curve would be best? As the rpm's increase it creates more vacuum thus creating more adv, but if I already have a curve setup to go from 12 degrees at idle to 28 degrees at 3000+ will the vacuum adv move the timing even higher once it is hooked up and mapped?

[DRPHIL914]

ok that is where I will start. My idle was about 1000 before, so if its a bit more than 900 no big deal,

so now that we have eliminated the old trigger points, how about a more modern solution to the MPS??( I guess that would be a custom digital injection system like megasquirt or the like) just seems like there ought to be a way......

[Mblizzard]

ok that is where I will start. My idle was about 1000 before, so if its a bit more than 900 no big deal,

so now that we have eliminated the old trigger points, how about a more modern solution to the MPS??( I guess that would be a custom digital injection system like megasquirt or the like) just seems like there ought to be a way......

I ran B also.

Looked into the modern replacement for the MPS but no such thing.

Got you covered when you are ready to do the Micro Squirt!

[DRPHIL914]

ok that is where I will start. My idle was about 1000 before, so if its a bit more than 900 no big deal,

so now that we have eliminated the old trigger points, how about a more modern solution to the MPS??( I guess that would be a custom digital injection system like megasquirt or the like) just seems like there ought to be a way......

I ran B also.

Looked into the modern replacement for the MPS but no such thing.

Got you covered when you are ready to do the Micro Squirt!

posting a follow up to some questions that came up on this thread a few months ago. I finally got my 123ignition installed and put the pre-set program at "B". I was looking at the vac curves for these settings in the book, and it looks like B is set for max - at 2200 rpm, not 3500 , that would be "C" or "3" so that leaves me wondering if I could get bit better response on that setting? has anyone compared the 2 on a 2.0 stock motor?
I only got to take 2 short drives with the motor warmed up. Here are a couple impressions right off the bat: No more hesitation or skipping that I would feel before at idle and a slight hesitation sometimes on acceleration, VERY SMOOTH, but not quite as responsive on hard acceleration at @ 3500 to 5000, so is that due to the curve selection? Also, nice steady low idle @ 900 or so, with stock d I had a hard time getting idle down under 1000, and then only with moving back distributor and changing the advance. And boy is it sensitive! in adjusting the timing If the distributor move even just a degree or two it changes idle very quickly. It will be interesting to see how this will effect gas mileage. But the better ignition with no missing has to help both performance and mpg.
I am going to leave this a B for now, but may try C later on. If I understand the pre-sets correctly and how they are labled in the manual, B will give you max advance @ 2200rpm, where as C setting will deliver this advance at 3500rpm., and that should actually be closer to stock. My distributor does have the vac nosle sticking out , I would assume that since I have a 75 2.0 throttle body and it only has the one outlet, and that is for retard not advance? and if so it would be left off anyway?

Phil

ps - sorry for hijack but looks like thread was dead anyway (IMG:style_emoticons/default/biggrin.gif) so hope you don't mind