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Old 08-12-2017, 12:19 PM   #1
edward2016
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Exclamation Fender rub going over bumps

Hi everyone,

Recently I've done some modifications to my car mostly including the Tanabe GF210 lowering springs and some new wheels. Since I put these new wheels on, I get a nasty scrape sound when going over pretty big bumps at speed.
My wheel set up is:
265 35 18 rota torque hyperblack all around

I'm curious if anyone has solved this problem or could guide me in the right direction. Bad wheel choice? Are my stock shocks too soft? Rip out the fender lining? Of course going slower prevents the sound but these highway bumps


Thanks
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Old 08-12-2017, 01:07 PM   #2
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Quote:
Originally Posted by edward2016 View Post
Hi everyone,

Recently I've done some modifications to my car mostly including the Tanabe GF210 lowering springs and some new wheels. Since I put these new wheels on, I get a nasty scrape sound when going over pretty big bumps at speed.
My wheel set up is:
265 35 18 rota torque hyperblack all around

I'm curious if anyone has solved this problem or could guide me in the right direction. Bad wheel choice? Are my stock shocks too soft? Rip out the fender lining? Of course going slower prevents the sound but these highway bumps


Thanks
Have you searched at all??

https://my350z.com/forum/wheels-and-tires-60/

Also, no one can tell you a thing without knowing the most critical factor.... wheel sizes? Front or rear? Offset??

If you don't supply or know what those are, go back to the link above.
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Old 08-12-2017, 01:10 PM   #3
edward2016
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Originally Posted by MicVelo View Post
Have you searched at all??

https://my350z.com/forum/wheels-and-tires-60/

Also, no one can tell you a thing without knowing the most critical factor.... wheel sizes? Front or rear? Offset??

If you don't supply or know what those are, go back to the link above.
18x9.5 front and rear +20 offset all around... sorry I didn't clarify that earlier. this rub/scrape only happens in the front.
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Old 08-12-2017, 01:28 PM   #4
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Try removing the top middle fender liner screw
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Old 08-12-2017, 04:39 PM   #5
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Originally Posted by edward2016 View Post
18x9.5 front and rear +20 offset all around... sorry I didn't clarify that earlier. this rub/scrape only happens in the front.
oem upper control arms?
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Old 08-12-2017, 04:59 PM   #6
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oem upper control arms?
correct
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Old 08-13-2017, 09:29 AM   #7
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Originally Posted by travlee View Post
Try removing the top middle fender liner screw
^^^ This. Most likely due to a confluence of wrong..... tires too short (by 0.67"), springs/car too low. Get proper size tires, the issue will go away.
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Old 08-13-2017, 01:10 PM   #8
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OP, where is it rubbing, the rolled part of the fender or the top? With 265/35 18's I can't imagine it's the top. If it's the rolled edge, than your set wont work without adjustable upper control arms and a negative camber alignment.


https://www.google.ca/search?q=350z+...&bih=662&dpr=1

Did you get it aligned when you lowered? - You should have. If you did what's the camber after lowering?
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Old 08-13-2017, 01:45 PM   #9
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Originally Posted by carbuffguy View Post
OP, where is it rubbing, the rolled part of the fender or the top? With 265/35 18's I can't imagine it's the top. If it's the rolled edge, than your set wont work without adjustable upper control arms and a negative camber alignment.


https://www.google.ca/search?q=350z+...&bih=662&dpr=1

Did you get it aligned when you lowered? - You should have. If you did what's the camber after lowering?
It seems as if the rub is coming from hitting the edge I would say at about the 2 o clock position rather than straight above it. note the location of tire wear. I did proceed to hit the 12 oclock position of the fender with a mallet... maybe not the best decision.

PS: the top middle screw is removed
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Old 08-13-2017, 04:10 PM   #10
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Mine = -2 camber, Lowered 1/2", 10" wheel, 275/35 18's (22mm offset)






No rubbing, even with 2 people in the car and under ax extremes.

So, either you're too low, you got your offset wrong, camber isn't what they say it is, you need more camber (need adjustable FUCAs for this) or since you now need some body work you can get your fenders pulled a bit (professionally - no mallet)
Finally, scrap the the setup and get one that's known to work.

That's all I got. Good luck

*For those thinking I'm young and shouldn't be holding the wheel at 10&2...that's my son drivin'. I'm the guy holding my breath, crossing my fingers and trying to calm him down haha

Last edited by carbuffguy; 08-13-2017 at 04:30 PM.
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