Guy on the N54 site is experiencing surges in power running high boost on his JB4. He's running straight Map 1 and 2 and said the surging issue is new and used to run those maps fine. While I did advise that most RS owners run a tapered map 6 instead of the stock, flatter boost maps, I don't see huge concerns in his timing numbers. The surging appears to be the ECU boost jumping up and down (from about 12 - 13 PSI to 10-11 PSI) as it moves through the middle of the RPM range. Could that be the spin limit sensors kicking in and out? Maybe warmer weather is requiring a higher spin rate to achieve his same boost targets which is why it has just recently popped up?