I went down to Mountune Race Engines in Essex today for some engine dyno training. I don't map engines for a living, but I write embedded software for motorsport ECUs, so it's useful to get a better feel for how people use the software I write.
We spent the day setting up the maps and then mapping a Ford Zetec engine. The engine itself was all ready (apart from a couple of sneaky faults induced by my boss to test us!), so we concentrated on configuration of analogue inputs, engine configuration (number of cylinders, firing order etc..), crank/cam setup, and finally the fuel and ignition maps.
It's surprising just how much setup is required before the engine will even start running. There's literally hundreds of maps (many of which I've written myself) and there's just so much that can be set incorrectly that will prevent the engine from running. Likewise, if something on the engine has a problem, you can spend ages thinking the ECU is at fault.
In the afternoon we set up the base fuel map - the dyno allows you to dial in a maximum engine speed and it will put sufficient load on the engine (via a water brake) to hold it at that speed. At each engine speed breakpoint we stepped through the load breakpoints and checked the lambda reading. It's very quick just to add and subtract fuel in the correct location to get the right air/fuel ratio.
Then we did some brief setup of the ignition map. The dyno displays the horsepower in KWatts and by increasing the advance, you can generally see the power increase up to a point.
I meant to take some pictures on my phone, but completely forgot!
One thing I was wondering, I know several people on this forum manage to map their Supras on the road. It sounds like it would be incredibly difficult to do in that situation. Do you have to do a lot of left-foot braking to stay at certain sites? Maybe it's easier if you are just making minor adjustment rather than mapping from scratch.