IrocMan

Hi, It cost about $6000 to bring a car from France to California (what I just paid for the 911). I think you will have no issue to drive it in USA, because of the safety regulations :( Maybe I'm wrong, I hope for you.

Hi, I'm transforming my C4 to be 2WD keeping the original ABS and traction control units. I try to write a correct english, I apologize if the words are not the good ones ! Here is a photo while the C4 was dismantled : On the right behind the battery you can see the ABS unit which has the pump and tank included. The things which can be tuned here are : the pressure sensor which works at different pressure on C4/RS than on C2/RS America/Turbo. Changing the sensor means 4 or 5 bars more. The other thing to tune is a very complex thing : ABS control unit (which also manages a large part of the traction control). in the cockpit, in the console are the gyroscopes, behind this : The gyroscopes are here under the '1109' wire : The control unit uses these two sensors with the ABS sensors to determine the lost of traction in any direction and try to correct it using longitudinal (front/rear) and transversal (for the rear only) tork distribution + playing with brake at each wheel. I have a friend in our team working on the de-assembled code to reprogram it, it looks complicated (more than the motronic). The brake are naturally managed by the ABS unit while the tork distribution is managed by these electro valves : You can find them on the left in the front compartment. There are two outputs : - one for the rear left/right distribution (working on the limited slip pressure) - one for the rear/front distribution (locking the visco) I found a way to bypass the rear/front one. There is also a compressor, which is at the very front of the car, but I didn't take any photo of it. This compressor works the same way the ABS compressor does. There is also a pressure sensor but I wouldn't recommend to modify it, it can result in very violent transitions for the VC. Hope this will help !