We always recommend that whenever possible, you have your engine broken in on the dyno with a competent tuner present who will make changes to the calibration to get the car running well enough for proper break in to occur. You can be TOO RICH or TOO LEAN which can hinder or make engine break in less effective.
1) PRIME YOUR ENGINE WITH OIL - Make sure the engine is full of all fluids (coolant, oil, trans fluid...etc). Use engine break in oil (we recommend Joe Gibbs). Disconnect power to your ECU or unplug ALL injectors, coils and your fuel pump and then proceed to crank over your engine with no spark plugs in the engine. This will offer the least amount of resistance to your engine turning over. The point here is to build oil pressure throughout the entire engine and coat any moving parts with oil BEFORE trying to get the engine to fire. I would say 30 seconds of turning the engine over should be enough to build oil pressure...if that doesnt happen, check what you need to and MAKE SURE there is nothing mechanically wrong. Do not turn the starter over for longer than 30 seconds as you may overheat it. Also it is a good idea to put your battery on a light charge so that there is enough voltage/current to turn the engine over with some speed. During this process, you CAN attempt to set base timing with a timing light, or you can wait to set base timing once you get the engine up and running.
2) START YOUR ENGINE - Once primed, plug your injectors, coils, fuel pump and any other accessories you unplugged, put spark plugs in your car and prepare to try and fire the engine. Make sure you have a reasonably decent basemap from your tuner to get the engine started and running. Set your fuel pressure to your tuner's recommendation (43-60 psi normally) and then try to start the engine. As it first starts and runs, make sure there are NO LEAKS from any fluids (fuel, oil, coolant) and then proceed to keep a close watch and listen to how the engine is running while you let it warm up to temp. If you can monitor this via the ECU great...have someone make sure the engine coolant doesnt go higher than 200F (95 deg C). BLEED your coolant system at this same time and make sure your coolant is cycling and that your radiator fans come ON at the appropriate time. If you have a wideband, make sure your engine is not running excessively RICH (lower than 11.5 afr) or excessively LEAN (higher than 15.5). If you need to, you can lower or raise your fuel pressure here in a pinch to try and get your Air/Fuel Ratio into a more appropriate range.
3) DYNO READY - Once you have heat cycled the engine once or twice and everything seems to be running good, you can now check that your vehicle is dyno ready. Do a COMPRESSION and LEAK DOWN test on your engine to make sure everything appears mechanically sound. You can use this first check AFTER break-in and dyno tuning to check and see how your engine has been broken in (sometimes compression will continue to rise a little even after your dyno session. Drive the car in and out of your garage, or around your parking lot or block to make sure the car rolls and is ready for the dyno (no suspension parts loose). You are also recommended to bring your car to an alignment facility before dyno tuning if it has been a while since your last alignment.
4) SET YOUR APPOINTMENT - Once you have gone through these steps, now set your tuning appointment with your tuner.