Best advance curve for SC 180 HP ROW full stock?

[Alex_92]

Hi all,

I've just bought a CDI+ for my Porsche 3.0 SC EURO 180 HP from 1979 with low compression (8.5).
For your information, I use only RON 98 gas.
Now I would like to lock the distributor and run a full ignition map with CDI+, and so that optimize the ignition of my engine.

I've got on Internet some personalized advance curves for 3.0 SC that people set up in their CDI+ but there are none applicable to my setup: Porsche 3.0 SC EURO 180 HP from 1979 full stock.
Indeed advance curves I found are for SC 204 HP or 188 HP, or upgrades with SSI, 964 camshaft and PMO.

So could you tell me please what will be an optimized advance curve for my SC EURO 180 HP in regards to the stock curve accessible here: https://ibb.co/T1tX7WL

My idea was the following with a distributor timed at 5 degrees BTDC at 900 rpm:

• 2 degrees below 800 rpm
• 800 to 1200 rpm = 0 degrees
• then rising to max advance of 26 degrees at 3,000 rpm

At the end I would have 31 degrees as total max advance.
The workshop manual indicates it must be between 24 and 31 degrees at 6,000 rpm.

Thank you in advance for your help and advise.
Have a nice day.

Alexandre (from Paris)

 

[classicretrofit]

Bonjour Alexandre!

We're not engine or timing experts, so offer only the advice contained in the manual. As you have found, there is some feedback from other enthusiasts online and I am sure Jonny will be along to share his experience with his SC shortly.

There is no real substitue for a run on a chassis dyno, where one could check what the car is doing under load and optimise the settings that way. Take it step by step, whatever you do.