Moving Chopper Wheels on Holden Ecotech Balancer
If you have to move the chopper wheel on an Ecotech Balancer to get
the right timing you need to know a few things.
The timing on a Commodore Street Stock is controlled by the ECU and
limited by the Knock sendor on the engine.
This works on a system of having excess advance and it being reduced
by signal from the knock sendor to the ECU.
Now this is all for a standard engine and thus once you add
some compression, bigger cam the factory setting will not be
The ideal way is to have static timing this works first class but
unless you have a Ford you cannot have it in Street Stock.
So you need to reduce the total advance of the engine by moving the
chopper wheels in the balancer.
Both wheels must be moved the same amount.
Before you start make sure you work out what advance you
Set up a pointer at 12 oclock on the balancer, but a stop (spark plug
with bolt welded in the end) in number one plug and turn the engine over carefully by hand.
Put a mark on the balancer, turn the engine the other way and put
another mark, the middle of the marks is TDC (top dead Centre), check this again by changing the length of the
You can work out the amount of advance with a protractor, or 90
degrees from TDC is 90 degrees and then divide it up in three and you have 30 degrees, divide that up in 3 and you
now have 10 degrees.
Use a timing light, do not use ones with advance dial most do not
work on a coil pack just a std timing light does the job first class.
Would out your total advance with the engine running, be careful of rattles
and that will click in the knock sendor and reduce the timing.
You want the minimun amount of total advance you can get and still get the power.
Move the chopper wheels to get the advance you require I modify a few balancers so
you can just change the balancer when tuning.
Remember everything is a compromise as most cars have too much compression for the
fuel, I have found 22 degrees is all you need on most modifed engines.
The next problem you have to work on is the knock sendor woking on a rough track
or if you car rattles this will reduce timing and reduce power if you have already reduce the total
HOW GOOD WOULD STATIC TIMING BE