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Coilovers Installation (Rears).

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Old 04-22-2010, 10:44 AM   #41  
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Anyone have issues with the spindle breaking(where the lower coil-over bolts to spindle)?Obviously it(spindle) was not designed for that.I would be concerned with breakage,especially with my luck.Is there anyway to reinforce that area where the coil-over mounts to the spindle?Or is it plenty strong & I am completely wrong?Could hitting a large pothole with the coil-overs cause spindle breakage?Or has the coil-over manufacturer already tested all "worst-case" scenearious?I think the coil-overs look great & offer lots of adjustablity but am I wrong in thinking there could be breaking which could lead to a bad accident or cause extensive damaged if/when it breaks?That area on the spindle was designed to damped the suspension not carry the weight of the vehicle.Can some coil-over guys that had their coil-overs for a while chime-in?Can some also post if their spindle has broken,cracked or fatigued in any way?Can any engineers or others post their ideas & opinions on my thoughts?
Few members stated they had their coilover set for 3+ years and never had issues with it. Members drive on tracks and streets. I'm going for mountain runs/twisties so if you hear that I went down a cliff , the coilovers failed.
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Old 04-22-2010, 04:30 PM   #42  
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We don't use QA1 springs. QA1 only has 2.5" ID coils. We use a 2.25" ID coil on all 4 corners and we only use Hyperco OBD coil springs.
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Old 04-22-2010, 05:15 PM   #43  
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Few members stated they had their coilover set for 3+ years and never had issues with it. Members drive on tracks and streets. I'm going for mountain runs/twisties so if you hear that I went down a cliff , the coilovers failed.
That rear lower shock mount is one BEEFY dude. I was at their shop a few weeks ago (was cool to find out they are only 10 minutes from me) and got to check one out, they certainly have built a very nice coilover setup for the C4! If you shoot off the side of the mountain, I doubt it'll be from coilover failure.
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Old 04-22-2010, 05:16 PM   #44  
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This is definitely a mod I am interested in. It's so clean, and looks pretty easy for the mechanically inclined. As for right now though, money is a bit tight.

I would like to ask though, where did you get that exhaust from? I will be replacing the stupid cheap tinny crappy sounding flowmasters the previous owned put in, and I like the ways yours is set up.
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Old 04-22-2010, 05:42 PM   #45  
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That rear lower shock mount is one BEEFY dude. I was at their shop a few weeks ago (was cool to find out they are only 10 minutes from me) and got to check one out, they certainly have built a very nice coilover setup for the C4! If you shoot off the side of the mountain, I doubt it'll be from coilover failure.
cool, now I can speed it up even more
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Old 04-24-2010, 01:05 PM   #46  
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Looks really good, Pete! I may have to do that mod to my '90 ZR-1 someday. When are you going to tackle the front install?
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Old 04-24-2010, 01:27 PM   #47  
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Looks really good, Pete! I may have to do that mod to my '90 ZR-1 someday. When are you going to tackle the front install?
They are already in place but, I have to relocate or move the sway bar towards the front maybe 5/8".
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Old 04-24-2010, 02:02 PM   #48  
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Quote:
Originally Posted by 94vettelover2 View Post
Anyone have issues with the spindle breaking(where the lower coil-over bolts to spindle)?Obviously it(spindle) was not designed for that.I would be concerned with breakage,especially with my luck.Is there anyway to reinforce that area where the coil-over mounts to the spindle?Or is it plenty strong & I am completely wrong?Could hitting a large pothole with the coil-overs cause spindle breakage?Or has the coil-over manufacturer already tested all "worst-case" scenearious?I think the coil-overs look great & offer lots of adjustablity but am I wrong in thinking there could be breaking which could lead to a bad accident or cause extensive damaged if/when it breaks?That area on the spindle was designed to damped the suspension not carry the weight of the vehicle.Can some coil-over guys that had their coil-overs for a while chime-in?Can some also post if their spindle has broken,cracked or fatigued in any way?Can any engineers or others post their ideas & opinions on my thoughts?

I've had my coil overs system for 6 years. Not problems. Mine were from DRM. My next C4 will have them
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Old 04-24-2010, 02:50 PM   #49  
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I am looking forward to hearing what you think after putting the car threw it's paces!
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Old 04-24-2010, 10:26 PM   #50  
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What exhaust are you running PLRX? It is so clean.
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Old 04-25-2010, 12:31 AM   #51  
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What exhaust are you running PLRX? It is so clean.
Magnaflow but, I painted it with black ceramic high heat
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Old 04-25-2010, 03:28 PM   #52  
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6 plus years on my 91 zr1 with coil overs. It has been the track and the strip several times and never had a problem with the rear spindles. I have seen a couple photos over the years of broken spindles from coils overs. Most times it broke because a severe impact though, or because the shock was too long and it got completely compressed and the spindle was the weakest link.
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Old 05-23-2010, 12:10 PM   #53  
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UPDATE May 23, 2010

The rear was too high

I attempted to lower it but the coilover lowering plates hit the rod bolts and could not lower the coilover all the way. Van Steel
ordered shorter springs to accommodate desired ride height



Notice the coilover was slightly rubbing the driveshaft, means the upper shock mount needed to be relocated about 1/2" forward.


I drilled a hole 1/2' on my mount and a machine shop made me a set of washers for it.

I know I mentioned above on post #1 the frame would not need modification but, I have to grind the frame to accommodate the new set-up.

Last edited by PLRX; 05-27-2010 at 12:46 PM.
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Old 05-27-2010, 01:25 PM   #54  
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any updates on the setup?
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Old 05-31-2010, 10:44 PM   #55  
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any updates on the setup?



Van Steel send a set of smaller/shorter springs but, they were too short and at the highest position it slammed the rear of the Vette down to the ground. The rear tires was barely touching the fender.

I disassembled all components and re-install the original spring.

In this picture you can see how the spring was rubbing against the half-driveshaft and I had to relocate the upper shock mount 1/2" towards the front.

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Old 06-19-2011, 09:14 PM   #56  
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Are all of the issues taken care of so far, I ma thinking about buying the Van Steel lower mount this week, I just don't have time to make my own

Does the rear lower shock mount pint stay close to the stock position?

As you know, there is limited space on the rear lower mount area. I just put new 375's on the rear and I hate the way the shock mount bolt is on that down angle
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Old 06-20-2011, 09:27 AM   #57  
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Here is the rear upper mount we now supply in the kit to move the shock forward.

http://www.vansteel.com/index.cfm?fu...p=1972&ID=3222
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Old 06-21-2011, 09:35 AM   #58  
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Quote:
Originally Posted by Van Steel View Post
Here is the rear upper mount we now supply in the kit to move the shock forward.

http://www.vansteel.com/index.cfm?fu...p=1972&ID=3222
Does it now come with this kit below or do you have to add it?


C4 Corvette Coil-Over System, Single Adjustable
C4 Corvette Coil-Over System, Single Adjustable

QA1 Single Adjustable Coilover Shocks
Hyperco Coil Springs
2 Rear Lower Mounts
2 Front Upper Mounts
Spanner Wrenches

Price: $1,699.99 4 pcs
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Old 06-21-2011, 03:51 PM   #59  
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Quote:
Originally Posted by rickreeves1 View Post
Does it now come with this kit below or do you have to add it?


C4 Corvette Coil-Over System, Single Adjustable
C4 Corvette Coil-Over System, Single Adjustable

QA1 Single Adjustable Coilover Shocks
Hyperco Coil Springs
2 Rear Lower Mounts
2 Front Upper Mounts
Spanner Wrenches

Price: $1,699.99 4 pcs
Comes with it. I just have to update the site.
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Old 10-20-2017, 08:43 PM   #60  
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