Speed adventage

I feel like I have a speed adventage when I play with my friend. We even used the same car with the same setup but I still beat hiim by a few car length even tho we did everything the same. We did this many times and it was evident that I had an adventage even tho everything was the same. Does anyone know how to fix this? This is not fair and fun. I want to play with my friend not destroy him in every race.

You probably have different difficulty settings, such as TCS off usually gives a launch advantage