I remember hearing somewhere that logging a tuned car's maf values might not equate to real-world values like it does when running the original software. Any truth to this? Like as a maf-reading sanity check on an OE setup, you could assume the values in g/s would end up roughly 80% of the rated hp, and when flashed that ratio would be different. I understand this is done to get more range out of the maf (like using a larger housing) but what if the housing dia. is the same?

I want to log a tuned but otherwise stock B5S4. I suspect the maf (bosch) is bad, but wanted to see if the values would be accurate because it has a flash.

Not trying to estimate hp (I'm not that crazy). Just trying to verify a maf is good.

Ok. We originally thought the car got a bad tank of fuel because it came on so suddenly.New plugs.

I will check the trims later today. What's the best way to check afr? I'm more familiar with later versions of me7 where you can look at blocks 30 on up for requested afr vs. actual..

Is this because there is no measuring block, or the values of the narrowband will be so far off @ wot they are of no value? What if the trims are ok, but the car still misses hard on load..Fuel pump?

Thanks for your help, nyet. I realize the list is endless as far as possible causes for misfires. But this happened from one day being great, to missing (8-10 deg of timing pull on all 6) the next day only under high load. I doubt all 6 coilpacks died at once, or all 6 injectors, or both icm's, and there is no reason to suspect mechanical failure at this point. I originally started this thread to find out if I could expect maf values in a flashed ecu to mirror stock values to rule out the maf (which still has nyet to be verified by anyone unless I missed it), since at this point it's my most likely suspect. I also just wanted to know if there were any other less known/obvious ways to verify I was getting enough fuel. I will try and keep the trivial questions down to a minimum. 

Every morning.