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ozwasp
P Plater
13 Posts
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 Posted - 04 Mar 2008 : 3:00:15 PM
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Hi All
I've got a VP SS with IRS
It's all pretty standard, but I've just bought some 17 inch VT SS rims and tyres.
The new tyres/rims seem to be grating on something up front when I put the brakes on and the back ones seem to rub on the inside of the wheel arch going over bumps.
The car seem to be fine with the original 15x7 inch rims with 225x60 tyres, so how much would 17x8 inch rims and 235x45 tyres make a difference? 235X45r17 has a slighty smaller diameter than 225x60r15.
Another thing, the brake pads seem fine and I can't see any obstruction from anything up front, so I don't know where the noise is exactly coming from...
Has anyone had a similar experience with putting bigger rims on their lowered commodore or ss?
Cheers, Will
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MILD50
Fully Licenced
850 Posts
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Posted - 04 Mar 2008 : 3:49:10 PM
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It's not uncommon for a lowered commodore to require an adjustable pan hard rod to prevent scraping on the rear... it basically just recenters things and gives you a bit more room to move. Whether this is true for live axle, IRS or both someone else will have to confirm.
As for rubbing up front... 235 might be too wide but I wouldn't have thought so. |
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nodg
National Driver
1667 Posts
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Posted - 04 Mar 2008 : 6:31:03 PM
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| it isnt possible on a irs eqipeed car because the entire cradle isnt going to move over, but for most who have a live axle, every lowered car requires an adjustable panhard rod and basically the lower you go the more off centre your going to be. 130 from your local parts stroe |
Cheers,
Nodg. |
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MILD50
Fully Licenced
850 Posts
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Posted - 04 Mar 2008 : 6:53:52 PM
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Ah- sorry then. I wasn't sure about that.
So what's the plan to sort out the problem on an IRS car? |
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nodg
National Driver
1667 Posts
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Posted - 04 Mar 2008 : 7:21:23 PM
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| that particular problem doesnt exist, but the camber of the hubs can be a big issue when lowering as the cradle is setup to be at a certain height and when you lower the car it puts the balance off everything |
Cheers,
Nodg. |
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VNSVLE
Forum Moderator
1316 Posts
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Posted - 04 Mar 2008 : 10:04:19 PM
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| I got 235's on my LE and no problems. How much lower have you gone?? Mine sits on lows without any problems. |
What's the difference between understeer and oversteer?
Understeer is when the driver is scared.
Oversteer is when the passenger is scared. |
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MILD50
Fully Licenced
850 Posts
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Posted - 04 Mar 2008 : 10:11:48 PM
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| I was talking about the scrubbing problem.... |
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VNSVLE
Forum Moderator
1316 Posts
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Posted - 04 Mar 2008 : 11:45:17 PM
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| eh???? |
What's the difference between understeer and oversteer?
Understeer is when the driver is scared.
Oversteer is when the passenger is scared. |
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ozwasp
P Plater
13 Posts
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Posted - 06 Mar 2008 : 02:53:58 AM
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Hi All,
I think it's definitely a camber issue on the IRS, but not sure about the grating up front.
There's a constant noise and it gets worse when I brake - sounds like metal on metal grating...
Just wondering if it is a wheel issue or perhaps something else such as bearings or brakes.
Guess I better have a proper look.
Will |
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nodg
National Driver
1667 Posts
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Posted - 06 Mar 2008 : 5:44:59 PM
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| wheel bearings or brake pads |
Cheers,
Nodg. |
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ozwasp
P Plater
13 Posts
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Posted - 07 Mar 2008 : 4:10:32 PM
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Hi All,
Took off 17x8 and put the original 15x7inch SS rims back on and all problems were solved - for the time being.
The problem at the rear was the camber caused by the IRS system - quoted $420 for a camber kit fitted.
The problem up front was the caps at the top of the struts basically bending up causing the problem.
Both problems were caused due to the extra leverage caused by going from 7inch to 8inch rims, however the rear problem is solved for good (or until wider rims are put back on), while the front end problem will continue to get worse until it is fixed - altough going back to narrower rims has eliminated any grating at the moment.
Hopes this help anyone else with similar problems
Will
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jas89
Forum Moderator
779 Posts
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Posted - 07 Mar 2008 : 5:00:18 PM
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with the adjustable panhard rod when me sis got her vr commy with solid rear axel it was lowewrd a fair bit and had a solid panhard rod...not adjustable and it was centerd (the axle) so is it possiable that you can get factory looking shorter ones? or is it only adjusttable ones as its gotten me thinking......cause like i said it was LOW lol
cheers |
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ozwasp
P Plater
13 Posts
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Posted - 08 Mar 2008 : 8:10:22 PM
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The VP SS's use IRS.
Panhard rods are only used on solid diffs
I did have a VN 5L with solid diff alignment issues... adjustable panhard rods are the way to go |
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HOT38R
P Plater
71 Posts
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Posted - 12 May 2008 : 3:53:54 PM
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The panhard rod is only used on live axle diffs, you must have the car insane low, my mate has a vn berlina that has irs and has 20x8.5 with 245's on the back and doesnt scrub at all,
just lip over the rear guards, as for the front, do you have after market sway bars? if so the front wheels can scrap on the sway bar at full lock (in my car i have 32mm sway bar in front and scrubs like hell)
Those rims should be fine, so must be other factors like, somthing on your inner guard?
hope this helps mate |
HOT38R |
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trizo
Forum Moderator
3091 Posts
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Posted - 12 May 2008 : 4:14:33 PM
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another quik fix to srubbing is a bit of pipe on the tyre and roll the car forward or back, this rolls the lip on the inside of the guard perfectly!! gives you another 20mm clearence  |
3 can keep a secret if 2 are dead |
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