Originally Posted by hzhao

For those of you have 430 and 450h, does VDIM really make any significant improvement in terms of traction and control in wet/slip conditions?

Thanks in advance.

Originally Posted by flipside909

Vehicle Skid Control = with traction control, an electronic system that controls engine output and brake application on individual wheels to help control loss of traction in turns.

TRAC = electronic traction control system uses both throttle and brake intervention to help control rear wheelspin.

VDIM = is a system which integrates braking (ABS and BA = brake assist), steering (variable gear ratio steering = VGRS), Vehicle Stability Control (VSC) [and Traction Control (TRAC) systems to help minimize loss of traction in a turn.

Here are some good descriptions and demo clips of how VSC and TRAC is seamlessly controlled by VDIM:

http://www.lexus-europe.com/technolo....asp?model=All
http://www.lexus.com/models/is/demo_.../vdimDemo.html

Here's an older article from The Auto Channel:
http://www.theautochannel.com/news/2...14/125451.html

As for the pedal dance, it allows you to disable both TRAC and VSC simultaneously which in essence will allow you to spin your tires as needed. The pedal dance for the TRAC/VSC disable is not to be confused with calling it a "VDIM OFF" sequence. Since the pedal dance will work with most modern Toyota and Lexus vehicles i.e. Avalon, IS250/250AWD, GS300/GS300AWD, these vehicles listed do not have VDIM. The only vehicles that have VDIM in the lineup are the Toyota Highlander & Camry Hybrid versions, Lexus RX400h, GS450h, GS430 and IS350 only.