Hi Andrej,
First of all, the parts you have found will fit in your VAZ 2106
The electronic ignition system
Is always a good upgrade to:
• Keep the ignition timing precise
• Make use of a more powerful ignition coil (to get a stronger spark)
A stronger spark is important if you have a tuned engine with high compression ratio.
The Octane adjuster
Is good if you have the following issues:
• Driving in countries where the gasoline quality is varying (Quality is most often seen in low/high octane levels)
• Live in a country where the temperature drops so much, making it hard to start the cold engine.
If your car has a tuned engine with high compression ratio: The octane adjuster is even more important/helpful.
If you plan to drive a Rally Raid through Africa or any other countries with poor/unknown gasoline, the Octane Adjuster could save you from engine brake-down.
Also, if you use an Octane-booster (used with engines having a very high compression ratio), it will be easy to adjust the ignition to take advantage of the extra performance from the octane booster. (And adjust back when the race is over - using normal gasoline)
When the temperature drops, we all know it can be hard to make the engine start. All old vintage cars that is only started by the start handle (no starter motor) had an ignition adjuster (= Octane Adjuster) – to make starting easier. After the engine were started the ignition were adjusted back, and when the engine got hot, the ignition could be adjusted again. You can use the Octane Adjuster for just that.
I would call it an extra bonus, since that was not the purpose for this device
New spark plugs
No, you don’t need new plugs, however, it would be possible to make the gap larger. Up to 0,7 mm (because of the more powerful ignition coil).
Start the car when battery is flat
Yes, it would still be possible to start the engine by Pushing, Hand-cranking or jump-start (electrical power assistance).
None of the 2 systems requires much power to operate.
When a battery is totally dead (0 volts) it will always be hard/impossible to use the hand-cranking, since the alternator will hardly make any power at very low RPM – Use the 2 other options instead.
Tip: Adjust the Octane Adjuster for a late (retarded) ignition (As if it were freezing cold), and the engine starts at once.
General tip for all old LADA's: If your country have gasoline in good quality (Octane > 95), you can advance the timing on your LADA, since the workshop manuals timing adjustment setting is for gasoline from year 1980, where the Octane were around 85-90.
I have a customer who advanced (early ignition) the timing and got a remarkable better acceleration and mileage (compared to following the timing instructions in the workshop manual) – Just be careful, there must be no engine-knocking.
Nerds can read more here:
https://en.wikipedia.org/wiki/Ignition_timing