Help! Tyre Scrubbing on Guard

[Scaredycrow]

have a bit of a curly one thats slightly doing my head in here. Let me lay it out for you:

06 MPS3
Mazdaspeed3 Lowering Springs (not the camber kit as well)
Koni Yellow Struts
Series 1 RX8 Rims (the 5 spoke ones)
Yokohama Advan AD08 tyres in 235/40/R18
Rear Guards rolled by nelson from Sydney Guard rolling

Now for the weird part, the passenger side rear tyre scrubs when going over speed humps, and minor bumps in the road *when theres somebody in the passenger seat*. Also scrubs if there weight in the boot etc.

The Drivers side *does not scrub* at all. ?

Bear in mind, the rest of the suspension setup is stock (sway bars etc)

It's hard to tell exactly where on the wheel arch is scrubbing, I might have to load a couple hunder kg's into the boot and have somebody watch while I drive slowly over a speed hump and hope we can see exactly what up.

Otherwise I'll be after a solution to give me more -ve camber on the rear. IIRC correctly the rear camber is not adjustable with the stock camber links?

Any and all ideas appreciated guys.

[240MPS]

My suspension is std and i run 18 x 8 with +46 offset with 235/40/18 my lips haven't been touched and I get the same thing on the passenger rear slight rubbing on extreme load in cornering and weight... But in saying that if I rolled my lips I suppose the scrubbing should be removed for me.... The RX8 rims are +50 offset if I'm correct, you wonder if the rear track has a different offset to left and right ???? question that needs to be looked into......

[Scaredycrow]

My suspension is std and i run 18 x 8 with +46 offset with 235/40/18 my lips haven't been touched and I get the same thing on the passenger rear slight rubbing on extreme load in cornering and weight... But in saying that if I rolled my lips I suppose the scrubbing should be removed for me.... The RX8 rims are +50 offset if I'm correct, you wonder if the rear track has a different offset to left and right ???? question that needs to be looked into......

Hmmm I hadnt considered that the track could be different from left to right... Surely it wouldnt be?

[240MPS]

Hmmm I hadnt considered that the track could be different from left to right... Surely it wouldnt be?

It's been known to happen over the years I had it on my SLR 5000 and I know it's a different setup to front wheel drives and I've had some friends with the same issue over the years... So yeh it would be interesting to find out........ It was only a suggestion that come to mind...

[YOU LOSE]

Mine rubs on the L/H rear as well only on exteme dips or speed humps with rear passengers , running 245 x35 x 18 with 48 offset gaurds rolled & car is lowered with coil-overs also running Cobb sway bars rubbing is so minimal I don't worry about it .


Col

[Scaredycrow]

Mine rubs on the L/H rear as well only on exteme dips or speed humps with rear passengers , running 245 x35 x 18 with 48 offset gaurds rolled & car is lowered with coil-overs also running Cobb sway bars rubbing is so minimal I don't worry about it .


Col

Thanks Col. I cant imagine how your getting away with 245's when my 235's are rubbing... Different offset though I suppose.

To clarify, I'm really not talking about extreme loading here at all. 2 people in the car, one of them being me the driver, and the tyre *will* scrub on right had turns (loading up the left hand side of the car). To be fair I dont drive like a nana, but its certainly not extreme loading.

I'm going to get some time in the workshop hopefully this weekend, and do a good wheel alignment and TOE adjustment as well. Hoping that, combined with the rolled guards will solve my problem. Otherwise its back to the stock wheels till I sort out a camber adjustment for the rear.

[Malicioso]

My guess would be that they have different camber setting from left to right???? Perhaps not by much but just enough to make it rub.

I have also read on many forums from the states that the main area in which the rear rubs is where the rear bumper meets the rear fender, even if your lips ave been rolled it will still rub on there even with 18x8.5 wheels in a moderate offset.

You need to see if it is rubbing on the inside or outside of the tyre, if is on the outside then a camber kit would be great idea as you may need to dial in a slight amount of Neg camber to pull away from the wheel arch. I think also lowering may change the Toe angle of the rears, I know this is a main issue with IRS equipped RWD cars.

[Scaredycrow]

My guess would be that they have different camber setting from left to right???? Perhaps not by much but just enough to make it rub.

I have also read on many forums from the states that the main area in which the rear rubs is where the rear bumper meets the rear fender, even if your lips ave been rolled it will still rub on there even with 18x8.5 wheels in a moderate offset.

You need to see if it is rubbing on the inside or outside of the tyre, if is on the outside then a camber kit would be great idea as you may need to dial in a slight amount of Neg camber to pull away from the wheel arch. I think also lowering may change the Toe angle of the rears, I know this is a main issue with IRS equipped RWD cars.

Its definitely rubbing on the outside and not the inside. (I can see the scub marks).

[bd581]

I'd check the distance between the wheel and guard on both sides before anything.
It's not uncommon for any car to be out of square. It's probably more common than a car actually being perfectly square.
If your guards are rolled the same amount?
Ride height the same both sides?
Wheel alignment would be my next thing to look at.
Then after that, possibly bushes.

[Malicioso]

That said is there any companies like SuperPro, Noltec or Nolathane that make bushes for the MPS 3???

or i guess they would be the same as a regular Mazda 3???