Top Speed Issue with my 2017 FiST

[Mikes180]

Hi all, I bought my first st about a month ago, however if I’m on the highway with this car it won’t go past 120km/h?
If I drop to 5th from 6th it still won’t go over, it stops at exactly 120km/h.

I don’t have any mykey activated and I have tried driving with both keys separate times.
I bought the car with mods :
Stage 2 Intercooler
Full exhaust system with Downpipe
Stage 1 software

 

[SteveS]

Probably a boost leak.

 

[WannabeST]

Is it possible the car is going into a limp mode?
120kmh is roughly 75mph. If the car is tuned, I would think there is some sort of fail safe in the tune preventing you from going faster. I would ask the previous owner (if possible) for tune details. I would start doing preventative maintenance. Sometimes something as simple as a spark plug ruins a perfectly running car.

 

[Intuit]

Check for codes.

 

[ryanvue]

Sometime a tune can limit how fast you can go, too. Some tunes, you can't even rev pass 3,000 RPM.

 

[Intuit]

Turn off "MyKey" functions. This allows you to set limits for times when the vehicle may be in the hands of a third-party... such as the kids or valet parking attendant.