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> 1-2-3 Ignition Settings, Whats the difference between Curves 2 and 3 ?
jim_hoyland
post Mar 28 2019, 10:50 AM
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I had the 1-2-3 installed last week and the performance is noticeable improved; based on the chart below, what would be the difference between Curve 2 and Curve 3 ?

My '75 L-Jet has the 2L crank, 96mm Pistons, and a larger Vanagon TB

So, it feels good on curve 2, what might happen going to curve 3 ?


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914_teener
post Mar 29 2019, 09:22 AM
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Timing advance is stated in relationship to engine revolutions or rpm.s which is timing.

From the 123 chart and to Jim,s question, curve 3 will add 1 more degree of advance up to 3400 rpms instead of 2700 rpm.

So a slighty different curve.

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jim_hoyland
post Mar 29 2019, 11:55 AM
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QUOTE(914_teener @ Mar 29 2019, 08:22 AM) *

Timing advance is stated in relationship to engine revolutions or rpm.s which is timing.

From the 123 chart and to Jim,s question, curve 3 will add 1 more degree of advance up to 3400 rpms instead of 2700 rpm.

So a slighty different curve.

Would curve 3 be more appropriate ?; and, can the curve selector be accessed while the distributer is mounted ?
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914_teener
post Mar 29 2019, 01:40 PM
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QUOTE(jim_hoyland @ Mar 29 2019, 10:55 AM) *

QUOTE(914_teener @ Mar 29 2019, 08:22 AM) *

Timing advance is stated in relationship to engine revolutions or rpm.s which is timing.

From the 123 chart and to Jim,s question, curve 3 will add 1 more degree of advance up to 3400 rpms instead of 2700 rpm.

So a slighty different curve.

Would curve 3 be more appropriate ?; and, can the curve selector be accessed while the distributer is mounted ?



Depends Jim.

Stock cam?

I think you may be able to access the dip switch in the car with a mirror and screwdriver...other wise you'll have to stand on your head to see it. The writing is pretty small.

I would try it, but hook up a timing light to confirm along WITH a wide band to make sure you are not running lean to make sure temps are under control.

You might net some top end power if the mixture is right. Only way to know is on a dyno and with a wide band.

I noticed a tremendous difference in mid range and part load with the vac hooked up. Meaning differences of throttle responsiveness (seat of the pants). This is with the stock cam.

If you use the vaccum advance make sure it ported vaccum and not manifold vaccum. The two sources are not the same.
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