High frequency vibration at highway speed

There appears one component in you vehicle that is "out of balance." the vibraction only occurs at a certain speed for this component. I had a 1977 Chevy small block V8 that came from the factory with a harmonic balancer in it that vibrated every time that the tach registered the engine at 2,200 rpm. I took the harmonic balancer off and took it to a special industrial balance shop on Kerney Mesa in San Diego. The found the heavy spot, drilled a hole in the harmonic balancer to lighten the heavy spot, and the vibration was gone forever.

 

There are various electronic and electrical components in the Prius that can generate high frequency sounds that are more noticeable to some drivers. Take the dealers offer and try another V, as close to your setup as possible, and see if it's also present.

 

Rive noticed the Toyo tires yield odd sounds depending on the road surface. Some loud some not so much. I would try another v with identical tires if possible at the same speed and road. I'd also make sure your tire reassure is where you want it or at least what the sticker says. W

 

I got a brand new Prius pkg 4 at Thanksgiving. I literally didnt leave the lot before I drove into the service dept and asked them to check the tire pressures and possibly shipping rubbers in the springs because it rode so bad. It has 17" Toyo Proxes A20s on it. Within a week the dealer replaced one tire because the radial run-out exceeded limits but I still have a very annoying vibration between 60-65 mph. The tires have since been rebalanced by two different shops but the vibation remains unchanged. After some on-line research, I find multiple similar complaints from others with Toyo tires and even the Toyo website has a reference to "the 65mph shimmy" with a 10 page explanation and possible cures. Iwent back to my salesman and drove 2 brand new standard Prius- one with 17" Toyos and one with 15" bridgestones. The Toyos shimmied at 65 mph and the 15 wheels were smooth. I am working with the dealer to get Toyota (not their fault) or Toyo to replace these tires with another brand. More unsettling is that I am finding other owners of Toyos with sidewall splits by 20,000 miles indicating probable belt shifting (gee- Iwonder why they vibrate?). This is a great safety concern for me. I would advise any potential buyers that a Prius is the best car I ever owned -on my second one- but avoid Toyo tires.

 

The vibration is driving. Crazy got on 03/13 a 2010 prius gave back to dealer two after on 03/26/13 give a 2012 prius same thing on 09/12/13 put new michelins primacy same problem vibration at 60 and 70 mpg dealer said vehicle as designed. I am now going to arbritation. No more prius for me . Sorry it crazy the whole vibrate.

 

Might be worth your while to find a tire jobber that had a wheel "balance r" that balances the wheel while mounted, a visual perspective of occurring events may determine causation.