It always happens in 4th at around 4500rpm. My theory is that its boosting too much and going into limp home mode. Eitherway Thorney aren't gonna figure that out and they'll just keep swapping sensors so refund time.
Just.. dont bother getting it mapped. Seriously, its an Astra. A nice Astra but come on, more and more power through a 2 litre engine and the front wheels is a waste of time. 240bhp is enough.
Spend the money on an ICE install. Or 3000 miles of Euro roadtrip in it.
Lots of ponies is great for straight line speed, and I would wager you are meeting the ends of your talent outside of straights before you are running out of power.
I know my car is plenty ahead of me in terms of capability at the moment.
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