Going to need more than that. What, EXACTLY makes this magical standalone so fast?
If you can't answer, no amount of dyno handwaving bullshit means anything.
I don't know what it is... I'm going to guess TQ management maybe....
FYI, there seems to be a similar trend of this happening with BMW 335's on stock ECU's... single turbos, etc... all making 600-700whp... all translate to crappy real world performance vs their measured power output. Is it the same thing? Not sure. But it's another example I can come up with.
You can see based on my examples what I think it is... would be other factors, who knows.
Fact is, GURU's trap speeds (and 1320 times for that matter) on 93 octane pump fuel (no meth) haven't been matched as of yet with a car running Motronic. Sherif's car was also trapping higher than most other cars with similar hardware. Both cars are/were on full standalone ECU's, both cars running just pump gas.
I know SnowTroopers car is fast, it also has awesome stuff in it and an awesome turbo. Not everyone can build a fast car, nor can everyone drive a fast car fast.
There are however plenty of high HP B5 S4 littered over the internet, could it be that every single one of them is an absolutely horrible driver to be missing so much off the fastest cars? Possible maybe... but doubtful IMO.