Discussion
This is a classic symptom of trouble at the wheels - balance is obvious, alignment next, but whenever I have suffered this, it has been 'square wheel syndrome' - the spider wheels will deform going over bumps in the road - I have scrapped several, get a GOOD tyre place, or dealer to check wheels for roundness and correct shape - usually starts wobbling at 90-100 mph (on track of course)
Just to add my experience - I get this too (exactly at 95->100 onwards). The fact it happens to a number of cars at that speed suggests inherent harmonic stimulation. Michael Caine took my car out after having the wheels checked for balance and roundness and said that there was nothing wrong with it.
The curious thing is that it doesn't always happen. I can't remember which way it is, but it particularly doesn't happen if I am driving one of up or down a slope. Other interesting thing is that it has never happened on a flat (no camber) track at any speed.
I was going to wait until I changed my tyres (away from SO2s) to see if that made a difference.
Cheers,
Andy.
The curious thing is that it doesn't always happen. I can't remember which way it is, but it particularly doesn't happen if I am driving one of up or down a slope. Other interesting thing is that it has never happened on a flat (no camber) track at any speed.
I was going to wait until I changed my tyres (away from SO2s) to see if that made a difference.
Cheers,
Andy.
yup, Steve, that's like me too at about those revs, on the over run, sounds like a Stuka on it's final approach and the windows sometimes join in "taka, taka, taka, tak" "Tally ho chaps, angels at nine o'clock" and all that! (sorry I got a bit carried away!)
I'd say Andy Moore has the money on this one, SWS
square wheel syndrome
Mrs Topaz do you receive mail from "the other place"? there's been a lot of talk about this very subject on there
simon
sorry i couldn't leave it at that, i'd quite forgotten about Andyvdg's line: "...suggests inherent harmonic stimulation"
andy are we talking about the same subject here!!
>> Edited by 21TVR (moderator) on Monday 3rd March 22:19
I'd say Andy Moore has the money on this one, SWS
square wheel syndrome
Mrs Topaz do you receive mail from "the other place"? there's been a lot of talk about this very subject on there
simon
sorry i couldn't leave it at that, i'd quite forgotten about Andyvdg's line: "...suggests inherent harmonic stimulation"
andy are we talking about the same subject here!!
>> Edited by 21TVR (moderator) on Monday 3rd March 22:19
whitey said:
tuscan_s said: I notice a lot of resonance at 2000-2200rpm in 5th. Anyone else?
try changing down a gear
If I try and accelerate in fifth at 2000 rpm in my Tuscan RR the engine labours.
Same here...big time. 2,500rpm is 5th is about right...any less and its not happy. You can feel and hear its not happy.
LB
luca brazzi said:
whitey said:
tuscan_s said: I notice a lot of resonance at 2000-2200rpm in 5th. Anyone else?
try changing down a gear
If I try and accelerate in fifth at 2000 rpm in my Tuscan RR the engine labours.
Same here...big time. 2,500rpm is 5th is about right...any less and its not happy. You can feel and hear its not happy.
LB
I'm glad you said that. I was beginning to think it was just my car that sounds as if it doesn't like less that 2500 RPM in 5th
Just to answer the ridiculous suggestion that a speed 6 engine should behave itself in 5th at 2000 rpm - well it does. I cruise around at in 5th at 1500rpm no worries. No resonance or anything - just a lot of noise as per normal. If you want to put your foot down, change up.
Cheers,
Andy.
P.S. Ask someone who owns an AJP8 the same question.
>> Edited by andyvdg on Tuesday 4th March 22:38
Cheers,
Andy.
P.S. Ask someone who owns an AJP8 the same question.
>> Edited by andyvdg on Tuesday 4th March 22:38
Well, personally, I find it impossible to run the Tuscan under 2000rpm in 5th. It labours, which is NOT doing the engine any good. The car is not responsive at under 2000rpm in top gear. In order to have a good engine, it needs to be treated with the respect it deserves....It's a race engine, not a 'poodling about' engine. 
Mine runs fine at the speed, no labouring. I'm not saying I would put the pedal to the floor, of course it's not going to be responsive, but the engine is flexible enough to pull away without any throttle from idle in 1st for example, then can change up to 2nd. Useful to know if your throttle cable snaps. 30mph I tend to run in 4th, just so it's in that noisy bit on the exhaust, just for effect
I wonder if the RR engines have more difficulty driving at lower rpm than the standard engines. I checked this morning, and 1500 in 5th equates to 40mph, and 2000 rpm to about 50mph. My car is fine at constand speed at both of those - although I noticed I wouldn't let it drop below 1500 without changing down. Likewise, if I wanted to make faster progress, I would normally drop a gear - although at 50mph it can pull away fine in 5th.
I'm just a bit concerned about some of the comments as the speed 6 is a very flexible engine. My car at one point had trouble driving below 2000 rpm, juddering and so on which was solved by a tappet adjustment.
Maybe mine is just run in nicely now ?
I'm just a bit concerned about some of the comments as the speed 6 is a very flexible engine. My car at one point had trouble driving below 2000 rpm, juddering and so on which was solved by a tappet adjustment.
Maybe mine is just run in nicely now ?
bertie said:
lady topaz said: Thanks TUS 373 yeah colour great nice to speak to someone with such impeccable taste.
Well here's another one then! Crystal Toapz with Portland & Prussian interior though.
Do I still qualify as having taste?
Of course, that would be impeccable taste you have Sir!
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