Worrying vibration at speed

[Animal]

94 J-spec N/A, new tires & Tein Super Streets all round. At normal speeds. the car handles beautifully, but I've started getting a vibration through the steering wheel (possibly coming from the passenger front side at 120mph and above. At 135, the vibration went from the steering, but according to the g/f, the passenger seat was picking it up badly. Handling didn't seem affected by it and the speed of the vibration didn't increase with the car's speed. It's kind of a slow 'thrumm thrumm' feeling through the steering wheel. Any ideas?

 

Full Revs

 

Animal

[Gazzawu]

get the alignment and tracking sorted out. then if symptoms persist check the subframe bolts are tight. how many miles have u done?

[VIL]

Also check wheel nuts have not gone slack. I know it sounds mad, but something very similar happened to a friend of mine!

[Digsy]

Get your wheel balance checked out, too.

 

Mind you , IIRC most high street tyre places don't check wheel balance at road speeds that high. I drove out of a tyre shop with freshly balanced wheels and drove right into vibration at 90mph, and had to go back later to have it fixed. They guy that fixed it said he checked teh wheel and founf an out-of-balance that would have caused a vibration "at those kind of speeds".

[Animal]

Yeah, I was wondering about subframe bolts having read a thread about them a few months back. The car's done about 100k miles, 10k of them since I bought it last November.