I have a problem with my car when its going in a straight line and there is a little bit sidewind it feels like the car wants to go flying .
when i drive over 140 kmh the car is not stabil
the car is a 2007 gs 300 tiresize= 225/50/17 dunlop

 

you might want to lower your car a little bit...

 

I have done that on a BMW 5 it was done by ac schnitzer the car was dropped in the front 4,5 cm and the rear dropped 4cm they putt new coils and springs the steering was better butt the comfort was totaly gone it feld like a go kart .what can you recomend for lowering so the comfort stays ?

 

check tire pressure...

 

So did the on board computer cut off the fuel at 140MPH?

Like they said, first check the tire pressue, then either lower or get a firmer shock (coilover will do both).

 

Slk.....he stated 140 km / hr, that is like 90 mph....you may want to get 18 inch rims, with the 245 40 18 tires....Mine feels very stable at that speed...

 

Sorry, should of read it more carefully!

 

i have tyre presure 2,8f 3,0r
i will ask here in holland what kind off coilovers they recomend
thank,s for the advice