Strange power

[Shane665]

Hey first post here ,I have a 120 brake diesel cdti , completely standard and my friend has the 150 model , however we raced and I blew last him ,both of us giving everything we had and he had a rolling start ,this isn't the first time I've beat someone with more power ,once beat a seat Leon with 180 ,which I assume is also a much lighter car ,and ideas why the car is so powerful for stock ,I've checked already for any mods and asked the previous owner who owned it from new