Drag time differences between rivals and showdown

hello all, just wondering why my Dart does 19.3 seconds in Rivals but struggles to get 19.5 seconds in showdown with all the settings exactly the same.

I’ve also noticed that if certain cars/players are in the race, my time drops another 2 or 3 tenths of a second no matter what I do.

this isn’t about being a sore loser or anything like that (I know that there are faster cars out there) but when I test a car in Rivals and tune it to be competitive, I would like it to perform in races the same as it does in testing

Maybe it’s timed on server. So it’s the network lag.

The times in showdown start from when the very first car takes off as well