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2Likes
06-25-2008, 08:15 PM
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CC Member
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Join Date: Nov 2007
Cobra Make, Engine: Midstates/Shell Valley Street Cobra
Posts: 891
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Not Ranked
Steering Wheel Vibration
Ok, any ideas...I did a search....I have a annoying steering wheel vibration ...not violent or dangerous and I can live with it if I have to, but....the tires, stock 15" have been road force balanced (9.5 on a scale of 10) and inflated to the recommended 18 psi cold....vibration occurs around 65 to 70...doesn't seem to get any worse at higher speeds.....I read people in here that have NO ...that is ZERO vibration... and I have also read that it is a "Superformance thing". Car has 2000 miles. Is there a shop in the Pacific Northwest that is the best at fixing this ? Steering Damper ? Thanks in advance for any advice..
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06-25-2008, 08:26 PM
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Senior Club Cobra Member
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Join Date: Oct 2006
Location: Santa Cruz,
CA
Cobra Make, Engine: SPF 2613 Titanium w/Black, Roush 402SR
Posts: 4,097
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Not Ranked
I'm running the Yoko's and haven't experienced vibration on my SPF. Was the car professionally aligned when you took delivery of it?
__________________
Doug
No stop signs, speed limit - Nobody's gonna slow me down - Like a wheel, gonna spin it
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06-25-2008, 08:41 PM
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CC Member
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Join Date: Feb 2007
Location: Austin,
TX
Cobra Make, Engine: Lonestar Classics, 302 stroked to 347; Metallic British Racing Green
Posts: 595
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Not Ranked
Bart I had exactly the same thing on a LoneStar! Vibrations would start at around 65-70 and I couldn't "drive through" them. I DID have my alignment done professionally AND I had the wheels fully balanced after I had finished the build.
I agree with Doug about checking your alignment, BUT after 1000 miles of frustrated driving, I finally took the front tires/wheels to have them REBALANCED. The local tire place COMPLETELY screwed THAT up (another story, they had to replace both front tires for free for me!!!!) BUT after the second balancing, the problem has gone away COMPLETELY!
Good luck
Glyn
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Cave magister imperitus - Beware the inexperienced teacher
"No, I DON'T have an accent, this is how English sounds when it is pronounced correctly!"
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06-25-2008, 08:49 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
This was covered at length a couple of years ago. It was determined that certain brands of tires were not "Round", and had radial runout which was unable to be corrected without changing tire brands. Our cars (in general) are more prone to this because of their light weight, undampened steel U joints used in the steering columns, solid steering wheels, and often times the use of Heim joints or metallic bushings at the pivot points and shock absorber mountings throughout the suspension. Its the "Nature of the Breeed".
Many of the cars use a Mustang II type front spindles. When combined with knock off adapters and width wheels we typically use, the scrub radius is put in a very unfavorable spot.
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way
Last edited by Rick Parker; 06-25-2008 at 09:05 PM..
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06-25-2008, 08:50 PM
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CC Member
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Join Date: Nov 2007
Cobra Make, Engine: Midstates/Shell Valley Street Cobra
Posts: 891
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Well sure...
Quote:
Originally Posted by Got the Bug
I'm running the Yoko's and haven't experienced vibration on my SPF. Was the car professionally aligned when you took delivery of it?
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...Yes, it was aligned, but I haven't checked it. I am under the impression that aligment will cause uneven tire wear and some directional pull but not vibration in the steering wheel but I am no expert..
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06-25-2008, 08:52 PM
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CC Member
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Join Date: Feb 2007
Location: Austin,
TX
Cobra Make, Engine: Lonestar Classics, 302 stroked to 347; Metallic British Racing Green
Posts: 595
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Not Ranked
Bart...what brand of tires are you running on?
__________________
Cave magister imperitus - Beware the inexperienced teacher
"No, I DON'T have an accent, this is how English sounds when it is pronounced correctly!"
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06-25-2008, 08:53 PM
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CC Member
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Join Date: Nov 2007
Cobra Make, Engine: Midstates/Shell Valley Street Cobra
Posts: 891
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The dealer sez the tires are as good as BFG's get
Quote:
Originally Posted by Rick Parker
This was covered at length a couple of years ago. It was determined that certain brands of tires were not "Round", and had radial runout which was unable to be corrected without changing tire brands. Our cars (in general) are more prone to this because of their light weight, undampened steel U joints used in the steering columns, solid steering wheels, and often times the use of Heim joints or metallic bushings at the pivot points and shock absorber mountings throughout the suspension. Its the "Nature of the Breeed".
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Apparently the force balancer indicated that the tires and rims were fine..
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06-25-2008, 09:01 PM
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CC Member
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Join Date: Nov 2007
Cobra Make, Engine: Midstates/Shell Valley Street Cobra
Posts: 891
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The stock Superformance issue
Quote:
Originally Posted by GlynMeek
Bart...what brand of tires are you running on?
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BFG Radial 255 60 15 on the front
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06-25-2008, 09:24 PM
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CC Member
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Join Date: Mar 2008
Location: fremont,
ca
Cobra Make, Engine: superformance/427 fe ford
Posts: 436
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i run goodyear billboards and i have the same vibration. only at that speed. i found alot of it is road surface. but still vib. on smooth as glass, just not as much. been pro. alianed and balanced. i just go alittle faster or slower. next might try balance weights on outside of wheel, but looks like s%$t.
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1952 MG TD - 53 HP 1970 SS454 Chevelle - 900hp 2007 spo2669 - 485hp 2001 Spclconst. softtail - 114HP 2006 Roadglide - 88HP
sold Roadglide.....bought 09 XR 1200 - 90 hp stock
i would rather live one day as a lion, than one thousand days as a lamb.
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06-25-2008, 10:22 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
"try balance weights on outside of wheel", It's a necessary evil if you want to improve things. But.... It ain't no big thang............
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way
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06-25-2008, 11:33 PM
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CC Member
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Join Date: Apr 2007
Location: PL,
MN
Cobra Make, Engine: SUPERFORMANCE ROUSH427 TRI POWER
Posts: 54
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steering shake
Bart, I had the same problem with my spf , 2585. I originally had the factory Eagle gt II's on the 15 inch rims and all was fine.I then replaced them with pse 17" and michelin 275's in the front and 335's in the rear. Then I gained a vibration at the 65-70 range, if I accelerate past that point , it goes away. Sounds like the same condition as you have. I know the allignment and everything else is fine, as it did not shake with the factory ones on it. I am going to road force balance them soon, and if that doesnt help, just deal with it I guess. good luck,
Marty
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06-26-2008, 12:42 AM
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Senior Club Cobra Member
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Join Date: Feb 2008
Location: Jacksonville,
FL
Cobra Make, Engine: VSE alum. frame, FFR carbonfiber body (under construction)
Posts: 293
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Not Ranked
For what it's worth....Mazda Miatas had a similar (identical actually) problem. The explanation was "tire construction method" (the way the belts are overlapped where they begin and end) that made some (mfg's) tires very bad. I won't swear to it but my recollection is that Dunlop's construction technique minimized the problem. It worked for me.
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06-26-2008, 05:42 AM
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Senior Club Cobra Member
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Join Date: Mar 2001
Location: Southern Connecticut,
CT
Cobra Make, Engine: SPF - 351W, 944 non-turbo
Posts: 2,105
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Over the years this subject has been beaten to death. It's not balance, it's not alignment, it's the tires. Most tires are not dynamically and/or dimensionally round. This and the fact that most Cobras do not come with a "rag joint" leaves many of us with a vibration at about 65MPH. In my case it comes and goes and is different in hot weather than it is in cold weather. I reduced it a bunch just by replacing my T/As with Yokos.
I worked in R&D for a major tire company for many years, what I'm telling you is more than opinion.
Bob
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06-26-2008, 05:52 AM
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CC Member
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Join Date: Oct 2006
Location: McLeansboro,
Il
Cobra Make, Engine: LA Exotic
Posts: 235
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I had this same problem...I put balancing beads(like the semi's run). Problem went away.I have used them on my F350 dually for the last 3 sets of tires. Never have to balance the tires!!! Also put them all 8 tires on my 27' gooseneck flatbed trailer(was getting a vibration that telegraphed back to the tow vehicle) and took care of the problem. I also gain about 20,000 miles in wear on the dually. I just put a new set of boots on my wifes Mountainere and put the beads in them also(18" Coopers).
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06-26-2008, 05:56 AM
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CC Member
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Join Date: Aug 2006
Location: Jersey Shore,
NJ
Cobra Make, Engine: Superformance SPF#2572, 427 S/O 2X4
Posts: 379
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Not Ranked
Bart,
I have BFG's on 15" rims on mine, and have zero vibration. I think you can narrow your problem down to tires, balancing or alignment. If the balancing and alignment check out, that only leaves the tires.
This is assuming that there is not a problem with your steering column etc., but too many SPF's do not have this issue for it to be design related, otherwise all of them would have it.
Good luck tracking it down.
__________________
Peace through superior firepower...or is it horsepower? Either way, more is always better!
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06-26-2008, 11:30 AM
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CC Member
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Join Date: Nov 2007
Cobra Make, Engine: Midstates/Shell Valley Street Cobra
Posts: 891
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Not Ranked
Aligment ?
Quote:
Originally Posted by Archrms
Bart,
I have BFG's on 15" rims on mine, and have zero vibration. I think you can narrow your problem down to tires, balancing or alignment. If the balancing and alignment check out, that only leaves the tires.
This is assuming that there is not a problem with your steering column etc., but too many SPF's do not have this issue for it to be design related, otherwise all of them would have it.
Good luck tracking it down.
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I think your point is right on. It isn't a necessary evil since most or many do not have the problem. I do not understand how a aligment problem could cause a steering wheel vibration ?? I am about out of the cheap solutions. I will take it to a different tire dealer and go thru the process again...
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06-26-2008, 12:00 PM
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Senior Club Cobra Member
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Join Date: Jun 2007
Location: Covington,
wa
Cobra Make, Engine: Superformance # 532, 466 BB, 560HP
Posts: 3,027
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Not Ranked
If you were close by I would swap tires and wheels with you to see if that eliminated the problem.
Any members near by you can do that with?
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06-26-2008, 12:02 PM
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Club Cobra Member
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Join Date: Dec 2002
Location: Penn Valley,
CA
Cobra Make, Engine: Purchased CSX3225 in 1968 for $4,995. Original 428 car but changed to 427 MR about 20 years ago.
Posts: 238
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Not Ranked
I had the problem with BFG T/A radials. They were our of round. I had the tires shaved and that fixed the problem. I now have Yoko Avids and no shake.
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06-26-2008, 12:17 PM
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CC Member
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Join Date: Jun 2005
Cobra Make, Engine:
Posts: 3,077
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Remember the tire balance machines are only as good as the users!!!!! You could hand over a submarine to me and I could not sink it, that does not mean it is a bad submarine it just means I am to stupid to use it.
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06-26-2008, 12:26 PM
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CC Member
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Join Date: Aug 2006
Location: Jersey Shore,
NJ
Cobra Make, Engine: Superformance SPF#2572, 427 S/O 2X4
Posts: 379
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Not Ranked
Quote:
Originally Posted by madmaxx
Remember the tire balance machines are only as good as the users!!!!!
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Exactly!! And who is usually doing the tire changes and balancing - the FNG who works there (F'ng New Guy). You hardly ever get someone that really knows what they are doing.
__________________
Peace through superior firepower...or is it horsepower? Either way, more is always better!
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