After starting this to evaluate the effect of putting turbo blankets over BorgWarner K03 turbochargers I decided to keep the effort going by adding logs that I have of my car with K04 turbos, and some other K04 equipped cars, and then my F4H data logs. F21 data hasn’t been as easy to come by but I have a couple data points.
![Turbocharger Boost Response Time versus Engine Speed](https://myaudis4.com/wp-content/uploads/f4h_spool_time.png)
I’m a bit surprised to find that the short lived FrankenTurbo F4H spools as well as the K04.
Next I’ll be adding TiAL 605 v1 data to the chart.