K04’s setting the bar high

One of the main goals I have in my search for the best stock motor turbo’s is to find something that has close to K04 spool.  I’m still in the early stages of getting the tune dialed in, and this boost level is greater than what the car will be operating with going forward, but it is a good representation of how quickly the RS4 K04’s can generate boost pressure.

Chart of BorgWarner RS4 K04 Boost Onset
BorgWarner RS4 K04 Boost Onset

25 psi of manifold pressure is achieved at 3080 rpm.