As we alluded to in the wrap-up of the kickoff of the FIRM’s Track Attack series, our first session in our BMW 435i was fine, even if the track wasn’t. We were there competing but also trying out some new Vitour P1 tires that have been performing well in our recent tire tests.
Hopefully the engine sensed the issue and boost was being limited due to turbo speed or something, though I would think you'd get a warning lamp for that. Otherwise a massive boost leak + some laps at WOT makes for some significant turbo overspeed.
What is the waste-gate duty cycle saying? If WGDC is 100%, but you're not hitting the boost target, this could signal a boost leak.
I don't want to jinx you but it's about time for the valvetronic system to act up.
Vacuum or electric waste gate control, n55 can have both. I'm a little surprised you did not get a failsafe when boost targets were not hit.
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