Acceleration After 180Km/h.......very Slow

[D22DJ 1]

Hi, I have the following problem with my car - alfa romeo 147 selespeed.

At full throttle, in the 4 gear from 5000-5500 rpm, the car is damn clumsy. This is at about 170 km / h approx. After switch 5 gear continues to accelerate damn slow. 1,2,3 gear does not feel some reflection, 4 and 5 gear is pretty bad car after those rpm.

I should mention that the engine is about 15,000 km after overhaul. It is also a catalyst removed and remap.

 

Before repairing the situation was the same. Diagnostics do not go any errors. The car has new spark plugs.

The only thing that strikes me is that MAF at maximum rpm/spot, not on the road, laptop have no good baterry/ units showing 300-310 of 409 suspected.

 

In addition to the subjective feeling of almost no acceleration after 180 km / h, my question is based on the clips on the Internet in which acceleration after 180 of the same car is pretty much vigor.

 

Where to look for problem?

thank you

regards