Suspension Question - Team Camaro Tech
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post #1 of 12 (permalink) Old Jul 14th, 17, 08:38 AM Thread Starter
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Nick
 
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Suspension Question

Camaro Friends,


History: Bought my first classic car in December (68 SS/RS not original)
Skillset: Rookie - I understand basic car stuff but looking to learn and do myself if possible
Issue: When I hit a dip in the road at a decent speed (>35) my rear end sits down on my tires, makes a nice screeching sound and cuts my tires


So based on my limited knowledge I would assume I need to replace shocks in the rear end to prevent this from happening. I don't know a lot about what I should be buying or if I am analyzing this correctly so any help would be appreciated.


Nick
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post #2 of 12 (permalink) Old Jul 14th, 17, 09:28 AM
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Mike
 
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Re: Suspension Question

What part of the tire is rubbing and where is it hitting? If it is on the outer part of the tire, you may not have enough backspacing on the wheels (backspacing sets the wheels in toward the inner fender well) or your tires are too big.

It looks like you have air shocks. If so, make sure you have air in them.

You may also want to post your wheel size, backspacing, and tire size.

Whatever the case, you will find good help here.

Mike.
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post #3 of 12 (permalink) Old Jul 14th, 17, 10:15 AM Thread Starter
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Re: Suspension Question

Well I think it is the outside but when I had the tire place look at them with me one tire is mounted inside out like they were hiding that fact. The rims are offset so to be honest I am just trying to track down the issue. It does drop pretty hard on humps so I definitely need to check the air in the shocks. Here are some pictures of the tires and a deeper cut. If I rub my hand on the inside of the tire well chrome it will turn my hand black so it seems to be squashing down on the tire.


Thanks for trying to help.
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post #4 of 12 (permalink) Old Jul 14th, 17, 10:57 AM
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Mike
 
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Re: Suspension Question

Your tire size is somewhat conservative, so you should be able to fit them without rubbing. The problem then comes down to the wheel width and offset. Looking the pics, it is clear the wheels need more backspacing. It looks like your tires stick well outside of the outer lip. The only way to prevent rubbing with the current wheels is to air up the shocks or raise/stiffen the rear suspension. Probably not what you wanted to hear.
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post #5 of 12 (permalink) Old Jul 14th, 17, 11:07 AM Thread Starter
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Re: Suspension Question

Thanks Mike and I planned on spending $ to get this fixed so I am ok with any direction just don't know what is best, cheaper or is it all preference. I like the look of the rims but am opposed to getting four new ones but that probably isn't cheap. Since I am new to all this not sure what the best options are for me. I will read up on raising or adding air (not sure on that either).
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post #6 of 12 (permalink) Old Jul 14th, 17, 11:27 AM
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Re: Suspension Question

Air shocks are designed for pick-ups and station wagons that carry temporary over loads. Pumped up you loose your suspension as all of the weight is on two columns that are nearly incompressible. I see you have multi-leaf springs and traction bars. The setting on the traction bar can be too tight for the street.

Your tires are larger than stock, which is why they are rubbing. Your factory E78-14 tire size was the metric equivalent of a 185R-14, so your P255R17 is much wider. Though looking at the offset on your 17 inch diameter wheels is a bit suspect as well.

You may need to roll the lip on the outer wheel well to keep from cutting the tires though they may still rub. The fact that it is making contact tells me that your springs are probably sagging with age; BUT most like the lowered stance you have now. Stock replacement springs will probably raise the car an additional inch and a half to two inches back to the factory ride height.

The only way to know what fits is to either try a tire and wheel combination and pay the price of buying new tires, and a restocking fee, and a mounting charge: or to buy this tool which costs a fraction of the price to see how much room you have.

https://www.summitracing.com/int/par...1201/overview/

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post #7 of 12 (permalink) Old Jul 14th, 17, 11:56 AM
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Re: Suspension Question

Can't tell for sure looking at the picture but it looks like you're running a wheel spacer that is pushing the wheel out towards the fender.

Maybe it's just me?

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post #8 of 12 (permalink) Old Jul 14th, 17, 12:05 PM Thread Starter
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Re: Suspension Question

Nope you are correct there is a spacer there from the previous owner. I feel like there are several things going on here so not sure where to start lol. I think they have a 30 offset with a spacer.
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post #9 of 12 (permalink) Old Jul 14th, 17, 12:09 PM
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Re: Suspension Question

Quote:
Originally Posted by Rambones68 View Post
Nope you are correct there is a spacer there from the previous owner. I feel like there are several things going on here so not sure where to start lol. I think they have a 30 offset with a spacer.
The spacer is most likely causing your problem.

Take it off and install the wheel without it and see how it works. Might just need a thinner spacer.

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post #10 of 12 (permalink) Old Jul 14th, 17, 02:15 PM
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Re: Suspension Question

Before removing the Spacer, can you get a finger between the Tire & fender lip?

After - How Many?
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post #11 of 12 (permalink) Old Jul 14th, 17, 02:49 PM
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Re: Suspension Question

Quote:
Originally Posted by Vega$69 View Post
Can't tell for sure looking at the picture but it looks like you're running a wheel spacer that is pushing the wheel out towards the fender.

Maybe it's just me?
Good eye!
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post #12 of 12 (permalink) Old Jul 14th, 17, 05:19 PM
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Re: Suspension Question

As said above, I would first remove the spacers. When you do, look at the inside of the wheel for the offset. It should be stamped on the inside, something like "ET10" or "ET25", etc. Also the width, somewhere on the inside it will be stamped 17x???

Another factor is that a 255/50/17 is a pretty tall tire. Normally I'd expect to see a 255/40/17 or 255/45/17 on there. What size are the fronts?


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