what turbo?
what car?
what boost?

was this tibs 3 door on a t4?

"under accelleration" is a bit of a crap test imo, you need to MAX the cooler out on a top speed run maybe its just the way its worded but theres loads of variables missing

40mph... is that sat on the rev limiter in 1st cog on full boost or pootling in 4th