I will be going to the dyno in a not to distant futur to have my ECU reprogrammed and yesterday I was thinking about the chronological order in which all the steps will take place and how long the session will take.

First the tuner will play with its computer to remap the air/fuel ratio and he will also remap the ignition timing. With every modification we will do a dyno run and see the result. When all this is done, we will adjust the timing of the camshafts via the camgears, so far so good.
My question is, by playing with the timing of the intake camshafts, we will also modify the timing of the ignition via the rotor of the distributor. Will we need to redo the ignition mapping of the ECU to compensate and see if the modification on the camgear is good, or, do we just modify the timing of the camgear and do a dyno run without considaring the ignition timing. When do we know that we finally have reach the maximum potential without spending 10 hours on the dyno trying every possible combination.

Any help will be appreciated.

 

You can start with a base line by setting the cam gears in "cero" and advancing your time to 18 deg. Then start tuning with the intake gear first by advancing it until you get a peak in power, then proceed with the exhaust gear in the same way.
Someone might have another methodes...

Edit: The 18 deg. part depends on the type of octane you have in your area.


[Modified by '01ITR#950, 5:49 PM 3/20/2002]

 

Every time you play with cam timing, you have to readjust base ignition timing.

18 deg BTDC should be fine unless your running high compression.

 

So what you guys are saying is that I should set the distributor at 18 degrees as a base set-up and then every time I advance the intake camshaft I should retard the distributor by the same degree to keep everything OK. Is this correct?
Dang I'm going to need a timing light.