This has been a problem since I got the car almost 2 years ago. Around 65 mph, the steering wheel and column as a rhythmic vibration like a fast Ratatat tat. I've got new tires all the way around, new steering column, the new aluminum arms, new eibach suspension, tie rod ends are not new but have no play in them. The only play seems to be inside of the steering rack. The last steering rack was exactly the same. I replaced it to get rid of this problem. I did replace the steering column and ujoints with a borgesen setup- that got rid of a tiny amount of play. Here is a video so you can hear the sound. The steering wheel is knocking with the sound. Rotors are new, brakes of been upgraded to the European power break it. The only thing I can think of is the rims– they have some scrapes around the edges. Could that be putting it out of balance enough to cause this? Or could the front tires be out of round? I suppose I could try to swap tires next time I have it in at DMC. By the way, DMC also took a look at the Front end and found nothing loose or needing replacement. Thanks
http://youtu.be/VgeLfCrrMls