If you have a VAG 1.4 TSI, you have different options for tuning your engine. One of the options is eg chip tuning which is a very easy and efficient way to get more power. It typically gives the extra torque and power you are just missing. Read more about 1.4 TSI tuning on the guide below.
1.4 TSI tuning guide - Read more about the options for upgrading your 1.4 TSI engine