[GrannyApple]

also I wanted to ask what is max rpm for 523? as I see in wikipedia its 125 kW (168 hp)
@ 5500 rpm, but my on board computer says its goes about 6.5 or 7.5 rpm,

That 168hp@5500rpm is the speed at which your engine will produce max HP.

Your car's ecu will restrict rpms to a max of 6500 to avoid damage

Unrestricted these engine could probably rev into 8000rpm before valve float

Also please be safe when driving