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> 123 Ignition Vacuum Adv, Learn me on some vacuum
nditiz1
post Jul 11 2018, 06:59 AM
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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?
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Mblizzard
post Oct 29 2018, 06:27 AM
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Phil

Don’t worry about the curve numbers. Set using the dizzy your max advance to be 27 at 3500. If your can’t get a good idle or it lacks power then change the curve.

So if you use B and lack power or it seems to be running poorly then go a curve that brings the advance later.

I was running 2056 so the B curve worked best but regardless of which curve you use set it so max advance is in at 3500.

If your nozzle on the throttle body has vacuum at idle then it is a retard. If it has vacuum on opening the throttle then it is advance.
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DRPHIL914
post Oct 29 2018, 07:35 AM
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QUOTE(Mblizzard @ Oct 29 2018, 08:27 AM) *

Phil

Don’t worry about the curve numbers. Set using the dizzy your max advance to be 27 at 3500. If your can’t get a good idle or it lacks power then change the curve.

So if you use B and lack power or it seems to be running poorly then go a curve that brings the advance later.

I was running 2056 so the B curve worked best but regardless of which curve you use set it so max advance is in at 3500.

If your nozzle on the throttle body has vacuum at idle then it is a retard. If it has vacuum on opening the throttle then it is advance.



what is the difference between the 2 and B ? both list same number dizzy . that part is unclear to me. on the chart the B lists Neg vac, along the "2" it lists same dizzy number but other numbers not neg vac. so that would be a car with no vac advance?
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nditiz1   123 Ignition Vacuum Adv   Jul 11 2018, 06:59 AM
Mark Henry   On dual weber's you shouldn't run vacuum a...   Jul 11 2018, 08:34 AM
72hardtop   On dual weber's you shouldn't run vacuum ...   Nov 2 2018, 02:15 AM
nditiz1   I'm not sure why Webers shouldn't use vacu...   Jul 11 2018, 09:09 AM
bbrock   I'm not sure why Webers shouldn't use vac...   Jul 11 2018, 09:25 AM
rhodyguy   Isn't there a 123 that doesn't require a v...   Jul 11 2018, 10:31 AM
Mblizzard   To echo what Mark said, after running the 123ignit...   Jul 11 2018, 11:14 AM
Philip W.   So Mike, I will be installing mine soon, right aft...   Jul 11 2018, 11:21 AM
BeatNavy   So Mike, I will be installing mine soon, right af...   Jul 11 2018, 11:40 AM
Philip W.   ok that is where I will start. My idle was about 1...   Jul 11 2018, 11:51 AM
Mblizzard   ok that is where I will start. My idle was about ...   Jul 11 2018, 12:16 PM
DRPHIL914   ok that is where I will start. My idle was about...   Oct 29 2018, 05:39 AM
Dave_Darling   ...how about a more modern solution to the MPS?? ...   Jul 11 2018, 01:13 PM
nditiz1   The whole reason behind the want to use vacuum adv...   Jul 12 2018, 06:04 PM
pete000   I am not using any vacuum on my 123   Jul 12 2018, 06:24 PM
Mblizzard   Phil Don’t worry about the curve numbers. Set ...   Oct 29 2018, 06:27 AM
DRPHIL914   Phil Don’t worry about the curve numbers. Set...   Oct 29 2018, 07:35 AM
BeatNavy   Yes, IIRC the difference between curve 2 and curve...   Oct 29 2018, 08:23 AM
DRPHIL914   Yes, IIRC the difference between curve 2 and curv...   Oct 29 2018, 08:40 AM
Dave97   Has anyone installed the Bluetooth model? What di...   Oct 29 2018, 08:22 PM
pete000   I'm not using any vacuum advance on mine. Work...   Oct 29 2018, 10:15 PM
914_teener   Not that I run carbs......I run D-jet. In my opin...   Oct 29 2018, 10:59 PM
DRPHIL914   Not that I run carbs......I run D-jet. In my opi...   Oct 30 2018, 08:09 AM


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