Ultima GTR 620 Governed?

I got my Ultima up to P939 and max speed is 200. I see guys doing 273 at Le Mans. What am I missing?
Upgrades used: All of them

Please help Forza geniuses!

You’re missing a tune!

It’s one thing to upgrade the car, it’s another to to tune it!

Try tuning the gear ratio’s and then see if it goes faster.

Are you running any aero? If so remove the wings if possible or tune them to minimum.

Thanks great ideas, I’ll do it