Have you stopped to wonder why VW didn’t produce a 180hp version of this 1.4 engine? After all it would be lighter, more economical and probably cheaper but instead they use the 1.8 engine to get 180hp. Are they stupid?
I’ve found out quite a lot about engine differences over the years. I think it was true decades ago that some manufacturers produced different versions of the same engine with different power outputs but the mechanicals were the same. That is no longer true. It’s unnecessary and too expensive. A huge manufacturer like VW is not going spend more on over-spec parts that are not needed. Even in different versions of the 2.0 888 the internal parts are not the same. Pistons, crankshafts and numerous other parts, some too small to notice, improve in quality as the power increases.
VW clearly feel that 150hp is the reliability limit for the 1.4 engine. Even if they did produce a 180hp version, it would not be the same as the 150hp one.
Years ago I spoke to a Ford tuning specialist about the 1.0 Ecoboost. They’d built a show-case car which was featured in Fast Ford, and can’t remember the power increase but it wasn’t just a map. They’d swapped bits too. As soon as I brought it up the guy said “Yes, you can do this, but don’t”. They’d done it to demonstrate what they could do but he said that your reliability goes out of the window. He said the engine could generate the extra power but nothing else about the car was designed to take it. Eventually, you’re going to start breaking things.
In the eighties there was a good chance that the same gearbox was used across the range but today they’ll build different ones, or at least different spec versions of the same one, to suit power outputs. Look at the MX5. Mazda designed the gearbox for the 1.5 as they had no intention of putting a bigger engine in the car. Then America said they couldn’t sell a 1.5 sportscar, they fitted the 2.0 engine and discovered that they couldn’t make the gearbox reliable with the extra power. Fiat realised this in testing for the 124 Spider and used the MX5 NC gearbox to avoid the issue but Mazda are stuck with cars that break gearboxes.
If you want a reliable 180hp car, buy a 180hp car.