dfink,
As you know I've spent a lot of time tunning stock Motronic 3.2L system. I have solid understanding of how the stock system works and it's maps. I think you can learn a lot by understanding the stock motronic system before you start tuning an aftermarket EFI.
I will tell you first hand that the real trick to power and throttle response is in the timing maps and not so much the fuel maps. Of course the fuel maps also matter but they are 2nd to the timing. You should first decide on your timing map(s) before you touch fuel. A flat timing map will not get the most out of these motors.
The 89 chip is the most aggressive chip Porsche produced for the stock 3.2L and if you inspect the maps you'll learn a lot from it. So here's the 89 timing maps, the stock chip has 3 of these: 1 for idle, 1 for PartThrottle and the last for WOT:
Idle ignition, not really that interesting just note that they set idle at 3deg BTDC or so. The thing to know is you can get idle speed control by simply advancing idle ignition if the RPMs drop below the target (like if AC comes on). You can do the inverse to bring idle down if it goes above target. In my car I have idle at 920RPMs with ign at 5BTDC if idle drops below 850rpm I start to crank timing up to as much as 10BTDC. you get the idea.
Then the WOT ign map: this map is very important and you should start by matching these 89 settings more or less. For starters simply set the WOT ign to about 25BTDC from 1000RPMs all the way to red line, this will give you decent power at WOT. Now once you have your AFR set at WOT to around 12.8AFR then start cranking the WOT ign map closer to 30BTDC, I would not go over 30! these cars have NO knock sensors. But at 30BTDC you should be using 93 octane fuel. For street driving and easy on the engine I'd use 27 or 28BTDC.
Now for the PT ign map: this is the hidden gem of tuning and many tuners simply get this worng! A flat PT ign map will have poor throttle response. Look closely at what the Porsche engineers did here, you will learn a lot. The load on the left 8% to 58% is kind of not right. Really think of the 3% as low-load and the 58% max load but not WOT, so just before the WOT ign map kicks in. So if you look at the last 58% row you find it matches very well with the WOT ign map and this is good to help with transition from PT to WOT. Same holds true for the 8% load row and the idle ign map (not exact but close enough). So the PT ign map starts like the idle map and ends like the WOT map and this makes sense. But look at the middle of the PT ign map, WOW! not linear at all. You can even see it in 3D graph form on the right. So the idea here is that at low load first 3 rows they sort of stay conservative. But in the center rows (16-21%) they really crank the ign timing into the 40BTDC range. Why do they do this? Simple, Throttle Response. This is so when you jab on the gas the engine delivers results. I'll tell you that this part of the map and these ideas is where throttle response comes from, but it's also coupled with Fuel Maps (topic for a future post). In my car this center area has timing in the low 50BTDC range, I don't suggest you do that for starters but I do suggest you try to match what you see in the stock 89 chip graph above.