70 Restomod Coil Over Question - Team Camaro Tech
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post #1 of 13 (permalink) Old Feb 2nd, 19, 07:41 PM Thread Starter
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70 Restomod Coil Over Question

On my 70 Z28...(with a 427 in place of the LT1) I have the rear ride height just like I want. Running 18x8 wheels, 265-45-18 tires. On the front, 17x7 with 244-55-17 tires. I have Hotchkis 2" drop springs but actually, the front end drop was more like 1". There is to much wheel well room for my liking plus it is sitting a little nose high. I want to go with coil overs.

My question is, when the coil overs are in place, say the setting is half thread...meaning in the middle of the adjustment range, where does the car sit? Would this be the stock height? Would the full up adjustment be stock ride height? I want to lower the car at a minimum of 2-3" in the front. My headers are tucked up so I really don't have to worry about scraping (much) and the oil pan is a 7 quart flat bottom moroso that is well protected.

Are coil overs the fix I'm looking for to lower the front end?

Thx

(in the pictures, that is water on the drive after washing and moving the car. NO OIL LEAKS)
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post #2 of 13 (permalink) Old Feb 3rd, 19, 04:25 AM
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Re: 70 Restomod Coil Over Question

Where the adjuster nut sits for a given ride height depends on the spring rate. Regardless of where the nut sits the coilover shock needs to be roughly centered in its travel at ride height. It is a common misconception that coilovers deliver huge amounts of ride height adjustment. They do not. The coilover shock length needs to be selected to deliver the desired ride height.

Before you resort to coilovers I would suggest trimming the coil length.

Don
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post #3 of 13 (permalink) Old Feb 3rd, 19, 08:45 PM Thread Starter
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Re: 70 Restomod Coil Over Question

Thanks Don. Whats my chances of getting the same spring height by cutting? From a little google searching, a 2nd gen Camaro with a big block needs the 550lb springs to retain stock height. I wish I had kept my SB springs installed to see where it sat. Hotchkis didn't recommend tha, said it would be way to low. EVery car is different I guess... with many anum engine parts..heads/intake, etc.

I would like the luxury of adjusting them back up some if needed without swapping springs.

Prepare to be the center of attention when you drive a first generation Camaro. You will be gawked at. Grown men & women will coo like children when you drive past. Children will scream like babies. Dogs & cats will get along. Does it get any better?
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post #4 of 13 (permalink) Old Feb 4th, 19, 04:18 AM
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Re: 70 Restomod Coil Over Question

When you cut a spring you lower the ride height and also increase the spring rate.

Don

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post #5 of 13 (permalink) Old Feb 4th, 19, 04:44 AM
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Re: 70 Restomod Coil Over Question

I would start by cutting 1 full coil. Then 1/2 coil at a time the achieve ride height. Would not cut any more than 2 coils.

As Don stated the adjustability of coilovers is limited. Many think you can just easily raise and lower the car 3 or 4 inches. Not so. If lowered too far the shock will bottom out when you hit bumps resulting in a terrible ride. Raise too high and it tops out the shock travel.

Iíve seen too soft of springs raised the the point where the shock travel is reached and the springs are compressed so little or no travel is left.

If you do go coil over itís very important the use the correct length shocks and the correct spring rating for your application. Also the quality of the shocks vary significantly.
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post #6 of 13 (permalink) Old Feb 4th, 19, 08:01 AM Thread Starter
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Re: 70 Restomod Coil Over Question

I'm going to try cutting the springs this week and see what happens. I tried this a couple years ago on a 68 and while they were cut the same, one side ended up 3/4 lower and I made certain they were in the pockets correctly. Ended up cutting two more sections, 1/2" at a time to get it right. Major PITA but it worked.

This is an article I found while searching for coil overs.

1973 Chevrolet Camaro: Better looks and handling with a bolt-in coilover kit

Prepare to be the center of attention when you drive a first generation Camaro. You will be gawked at. Grown men & women will coo like children when you drive past. Children will scream like babies. Dogs & cats will get along. Does it get any better?
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post #7 of 13 (permalink) Old Feb 4th, 19, 08:14 AM
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Re: 70 Restomod Coil Over Question

Quote:
Originally Posted by Craig1969 View Post
I'm going to try cutting the springs this week and see what happens. I tried this a couple years ago on a 68 and while they were cut the same, one side ended up 3/4 lower and I made certain they were in the pockets correctly. Ended up cutting two more sections, 1/2" at a time to get it right. Major PITA but it worked.

This is an article I found while searching for coil overs.

1973 Chevrolet Camaro: Better looks and handling with a bolt-in coilover kit
Look nice and cost about $500 a pair.

Take a close look at the installed coil over and imagine how hard it is to get the adjustment wrench in position to move the lock nuts.

Can be done but not as easy as it's made out to be.
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post #8 of 13 (permalink) Old Feb 4th, 19, 09:29 AM
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Re: 70 Restomod Coil Over Question

Quote:
Originally Posted by Craig1969 View Post
I'm going to try cutting the springs this week and see what happens. I tried this a couple years ago on a 68 and while they were cut the same, one side ended up 3/4 lower and I made certain they were in the pockets correctly. Ended up cutting two more sections, 1/2" at a time to get it right. Major PITA but it worked.

This is an article I found while searching for coil overs.

1973 Chevrolet Camaro: Better looks and handling with a bolt-in coilover kit
What is the useable stroke of that shock? 3 inches? Compare that to a stock shock. No fun bottoming out on the shock....

That style of coilover is subject to side loading of the shocks which can lead to seal failure.

Don
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post #9 of 13 (permalink) Old Feb 4th, 19, 10:23 AM
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Re: 70 Restomod Coil Over Question

Have you considered putting a set of drop spindles on it? Might be much easier and safer way to go than cutting the springs.

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post #10 of 13 (permalink) Old Feb 4th, 19, 12:32 PM
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Re: 70 Restomod Coil Over Question

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Originally Posted by hueycamaro View Post
Have you considered putting a set of drop spindles on it? Might be much easier and safer way to go than cutting the springs.
Drop spindle are about the worst thing you could do.
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post #11 of 13 (permalink) Old Feb 5th, 19, 08:54 AM
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Re: 70 Restomod Coil Over Question

I'm an amateur. Can you educate me on drop spindles and why they are a bad idea? Ive been considering them for my 73. I have the Hotchkis TVS SB suspension with ~2 inch drop in front and ~1.5 in back. The rear looks good, but the front end is a little higher than I like. I have hotchkis SPS 1.5 shocks. Ive been considering a drop spindle as a way to get the front down a little more. Your advice would be appreciated. Thanks

Sorry for hijacking the thread Craig 1969.

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post #12 of 13 (permalink) Old Feb 5th, 19, 10:49 AM
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Re: 70 Restomod Coil Over Question

Reduced turning radius because of A Arm clearance

Tie rod can hit wheels depending on backspace

Bumpsteer

To name a few issues.
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post #13 of 13 (permalink) Old Feb 5th, 19, 11:23 AM
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Re: 70 Restomod Coil Over Question

Vega$69- thank you.

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