Mention it or take it back to your mapper quite simple to fix as long as you can find a stretch of road where it can be repeated.
It's got too much boost duty or too little boost target for part throttle.
Car is trying and is capable of boosting but goes too high so ECU pulls it back because it breaches the set target boost.
It then tries again hence the oscillation.
Quite a common fault after mapping, more so for Rolling Road mapping as they don't often run it at a part throttle scenario or even use a generic map and just tweak the full throttle settings.
There are quite a number of similar questions where people experience this on the long motorway drive home from wherever they got it mapped.
Last edited by Scott.T; 02-05-2010 at 09:34 PM.
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