is shaking at 150 normal?
Race Director
Joined: Aug 2003
Posts: 16,270
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From: "It's 106 miles to Chicago, we've got a full tank of gas, half a pack of cigarettes, it's dark, and
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-‘18-'19
NCM Sinkhole Donor
'Course we're talking about this kind of speed on a track, right? 
I agree with the Hunter Roadforce balancing on all four tires. Vibration is generally a function of an out of balance tire. Might be just one.....
I agree with the Hunter Roadforce balancing on all four tires. Vibration is generally a function of an out of balance tire. Might be just one.....
Race Director
Joined: Oct 2004
Posts: 18,401
Likes: 3
From: Retired but working
Cruise-In VI Veteran
I had the same problem at about 120 and took it in and had alignment checked. It was OK.
Was about to get them speed balanced and found some mud, bout the size of a 50 cent piece stuck to the inside of the RF.
Took the wheels off and steam cleaned them and it's good to about 130 or so, but that is as fast as I had it so far.
On my next set of tires and rims I am going to have the tires "trued" There is a place here in town that does it.
We used to do it on a sprint car I drove (slicks asphalt).
Had a set of tires on my 63' coupe trued and it was like riding on velvet and they lasted forever.
Best of luck, but only do that speed on the track.
Was about to get them speed balanced and found some mud, bout the size of a 50 cent piece stuck to the inside of the RF.
Took the wheels off and steam cleaned them and it's good to about 130 or so, but that is as fast as I had it so far.
On my next set of tires and rims I am going to have the tires "trued" There is a place here in town that does it.
We used to do it on a sprint car I drove (slicks asphalt).
Had a set of tires on my 63' coupe trued and it was like riding on velvet and they lasted forever.
Best of luck, but only do that speed on the track.
Instructor
Joined: Mar 2004
Posts: 136
Likes: 0
From: Ft. Worth TX
I agree with all of these guys about balancing/alignment. Of course it's cheaper to get your car balanced first. Also if you have to keep in mind other variables come into play as well. Such as the grade of the road. My ride was pretty smooth at 145, and that was on a semi-rough farm road.
Drifting
Joined: Jan 2001
Posts: 1,347
Likes: 4
From: Slidell La
I Can't say but
I Can't say but, I have it on good authority that mine is smoooooooth at 135+. We aren't talking wind noise here,, there is a distinct whooooossssssssssshhhhhhhhhhh. 
Check your tires for round/balance. I think you will find the problem. Don't forget to look at rims for damage also. 99 Nassau Blue at 70 mph
Check your tires for round/balance. I think you will find the problem. Don't forget to look at rims for damage also. 99 Nassau Blue at 70 mph
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Burning Brakes
Joined: Feb 2005
Posts: 787
Likes: 5
From: Kansas
St. Jude Donor '07
My '04 is smooth as silk at 150+ with aftermarket tires/wheels.
Only one "major" pass so far: (only have about 1200 miles on it so far)
4th to 5th shift at 146, a few more anxious moments with my foot in it in 5th, but my grin was so big I didn't notice what we topped out at. Oh well, I guess I'll just have to do again... 
Only one "major" pass so far: (only have about 1200 miles on it so far)
4th to 5th shift at 146, a few more anxious moments with my foot in it in 5th, but my grin was so big I didn't notice what we topped out at. Oh well, I guess I'll just have to do again...
Supporting Tuner
Joined: Sep 2004
Posts: 51,896
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From: ================== Houston, Texas www.englandgreen.com ================== Necessary Evil™ __________
CI 6-7-8-9-10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14
Originally Posted by EscapePod
I've had the Vette up to 170 without noticeable vibration.....
EscapePod is a very fitting nom de plume!!!
Just kidding
152 - lots of buffeting and wind noise but rock solid.
EG
Burning Brakes
Joined: Aug 2003
Posts: 881
Likes: 1
From: Hernando MS
St. Jude Donor '03-'04-'05-'06-'07
If Balance Checks good....Have a 4 wheel alignment done. My `98 had a vibration...the way I like to describe it, is like a thrumming vibe...it comes and goes in one secound intervals. Turned out to be the rear wheels where way out of alignment!! It is so smooth now...like "Butta"
But I`ve NEVER! EVER! had my Car past 72 miles an hour!!! Thats my Story and I`m sticking to it!!!
But I`ve NEVER! EVER! had my Car past 72 miles an hour!!! Thats my Story and I`m sticking to it!!!
Thread Starter
Team Owner
Joined: Feb 2001
Posts: 21,016
Likes: 0
From: Galveston... well, Santa Fe Texas
Cruise-In VII Veteran
St. Donor '03 & '06
I hit 150 and let off immediatly (and onto the brake, which caused alot of steering wheel vibration)
I wasn't able to pinpoint where the vibrations were occuring on the way up to 150 however. It felt like everywhere, so I'm assuming it was the seat.
BTW... PIO= Pilot induced Oscillation.
I wasn't able to pinpoint where the vibrations were occuring on the way up to 150 however. It felt like everywhere, so I'm assuming it was the seat.
BTW... PIO= Pilot induced Oscillation.
Burning Brakes
Joined: Oct 2004
Posts: 1,224
Likes: 0
From: Rowayton Ct.
Originally Posted by MonteHall
there is some very noticable vibration. the rear-view vibrates bad enough that you can't even see behind you with it. Up to 140 it's fine.
just an alignment issue?
just an alignment issue?
Lifetime Member
Joined: Dec 2002
Posts: 10,702
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From: New Jersey
St. Jude Donor '05, '12-'13, '15-'16, '21
Originally Posted by JDs00PewterCoupe
Alignment or balance. I'd check the balance first.
that is....if you can deploy the shute and find a spot to have the work done.