My 300G Mark X's rear end slides sideways when I accelerate with full throttle from 30 to 40Km/h, the car would first down shift to second gear and then the rear tyres would loose traction and slide sideways and the car will begin to rotate, as if it is undergoing oversteering. This can be quite scary on a vehicle without VSC and TRC, and by that stage the car is doing 70 to 80 Km/h. I need to lift off the throttle a bit and countersteer to control the sideway movement to avoid crashing it into the medium strip or other vehicles on the road.
I am currently using the following tyres with stock suspension:
Front: 224/45R18 Pirelli P1 (~2,000Km on them)
Rear: 245/45R18 Yokohama Advan Sport V103 (brand new)
I just got the new Yoko Advan Sport V103 tyres today for the rear wheels, with a cross-section of 245, I thought it would improve the situation, but in fact the wider tyres have made it worse, because previously the rear wheels would just spin and slide sideways, now they have much wider tyres (up from 225) and stickier compound, so instead of just spinning, they now spin and gain traction intermittently, rotating the car even more.
Do you guys also experience this on your 300G or 250G? Is it simply the power of the 3,000cc 3GR engine or is there something wrong with my car? Could it be a wheel alignment issue? But I haven't been able to find Mark X's wheel alignment data, and I doubt that garages in Islamabad have them, so I have found Lexus GS300's alignment data, since its suspension parts are interchangeable with that of the first gen Mark X's, is this a good idea?