05-31-2012, 04:40 PM
Upgraded to 16" SVT alloys from 14" steelies and have had a rhythmic noise and pulsing from around 20 - 30 mph from the front passenger side. I got the wheels balanced. No difference. I switched sides with the fronts. No change. So my assumption is a warped rotor which was not evident until I put the larger rims on, the theory being that the greater distance from the point of rotation to the edge of the tire would exacerbate the problem? Decent theory?
06-01-2012, 04:47 PM
Could be alignment! Do you have any cupping or other issues with tire wear?
06-01-2012, 04:50 PM
I just put these rims on the car. I thought about alignment, but there is absolutely no wandering if I let go of the wheel, and the pulsing/noise is at low speed. I may change out the rotors and pads this weekend.
06-01-2012, 05:12 PM
Hey there, i have ONE strange possibility for you to check....
When the wheels are off, NOTHING is holding the rotors in place - so if they separate from the hubs a piece of "crud" COULD get between the rotor and the hub causing it to not run true.... EVEN after ou switch the wheels again...
On an "old" car, there is ALWAYS crud just WAITING an opportunity to get where it doesn't belong....
Worth a check, it's "free"... (grin)
06-01-2012, 05:41 PM
I'll definitely have a look.
06-01-2012, 05:41 PM
I like your theory, gidds. I have an issue that is possibly similar except mine is a more noticeable noise when I put the 15" (vs. 16" OE) steelies on every winter. The noise has persisted over 3 years now but hasn't gotten any worse... and it's subtle to begin with... except on the 15" steel wheels when it becomes more pronounced.
Sailor, that's quite possible too. You're right about "crud" just waiting for the opportunity to get in there like that...
Not trying to threadjack, here. Let me know if you discover an answer gidds and I'll do likewise!
06-01-2012, 06:09 PM
I switched sides with the fronts. No change.
Your tires are not directional?
Directional tires rolling the wrong way can make weird sounds and vibrations.
06-01-2012, 08:37 PM
That sounds similar to what I've posted about here:
I've noticed it only since switching to 16" Ford alloy wheels - had 15" steelies with snow tires on for the last 8 or 9 months.
06-01-2012, 08:43 PM
Actually I had already read your thread. I am going to try and do the brakes and rotors tomorrow so we'll see if that's the problem. Tires are Pirelli p6 so yes non-directional.
06-01-2012, 08:46 PM
My pads and rotors have less than 10k miles on them - I hope it fixes it for you, good luck!
06-01-2012, 09:05 PM
What kind of pads and rotors do you have on there?
06-01-2012, 09:21 PM
Advance Auto Parts - not the cheapest, but not the fanciest either.
06-03-2012, 12:58 PM
I replaced the pads and rotors this morning and discovered what feels like some scalloping on the tires which seems almost certainly to be the culprit. The pulsing/noise is still exactly the same. The good news is I needed new brakes anyway so the project was not a waste of time. I bought the rims and tires used from a member of this forum and the ones with the scalloping looked fine. I didn't inspect them carefully enough because the tread depth is still quite good. Obviously you never know what you are going to get and in this case I kind of got screwed a little bit. He did say they had been sitting for a while which I imagine is the cause of the damage.
06-04-2012, 04:50 PM
So, I swapped the fronts and rears today and yes, bad tires is in fact the problem. MUCh better just being dragged on the back than they were on the front.