Car stops accelerating at 55-65mph

Question

I used my own car for VPP (a sport car similar to the sport car prefab in VPP) but used the settings from the built-in sport car prefab. The car handles really well, but whenever I accelerate on a flat roadway, the car reaches about 63-65mph, slowly reduces its speed to 53-55mph, and then repeats. When going uphill (6.25* slope) the same thing happens between 35 and 40mph. The car also (on a flat roadway) has sudden difficulty accelerating past 45-47mph.

I can't find the problem (ex: increasing the engine torque didn't solve the problem). What could be the issue?

Comments

Can you reproduce the problem with the Sport Coupe itself?

Answer 1

I ended up finding the problem; I double-checked the settings and found out the gearbox was still at default settings. The car was shifting into 5th gear at 65mph, which caused it to slow down because the gear was too high. I changed the gearbox settings (so it shifts gears at 6000rpm instead of 3500rpm) and the car now goes 90mph on a 1/2 mile stretch and up to 65-75mph on the 6.25° hill.