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Which shocks for Autocross?

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Old Jul 31, 2007 | 06:15 PM
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It took mine about 200 mi of just driving fwy. Then I dropped the front just a little on the stock bolts to get it where I wanted it. I'm going to wait another couple of weeks, then if it's still sitting the same, have it aligned. This is about how it sits now. (low quality phone camera.. sorry)

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Old Aug 1, 2007 | 11:12 AM
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Would it make any sense to adjust the ride height without any shocks on the car ? It seems like my car's ride height varies depending on whether I turned left or right into my garage.

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Old Aug 1, 2007 | 12:07 PM
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Originally Posted by INTHERED
Would it make any sense to adjust the ride height without any shocks on the car ? It seems like my car's ride height varies depending on whether I turned left or right into my garage.

INTHERED
yeah shocks can do that. i dont know whether setting your ride height without shocks is the answer though. they have a gas charge in them which acts like a spring so technically, depending on the strength of the charge, it can raise your ride height a decent amount. i would just rock the car back and forth and maybe roll out and back into your garage and see if that levels it out a little.
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Old Aug 9, 2007 | 12:04 PM
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My C6 Z06 shocks just arrived can't wait to put them on my C5. Should I reuse the original nut, retainer and insulater from the front shocks or purchase new parts ?

Thanks >>>>> INTHERED
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Old Aug 9, 2007 | 06:22 PM
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You do have to use some of the existing parts in the front. Also, it will make installation MUCH easier in the front if you compress the shock some and lock it. I used a motorcycle tie-down but you could use cable ties or anything else to hold it. The rears were pretty easy.
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Old Aug 10, 2007 | 07:36 PM
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Originally Posted by VetteDrmr
I've autocrossed with Z51 and '04 Z06 shocks, and there are some observable differences.

With the Z51 shocks my car would get a bit unsettled over bumps in the lot we run in. The Z06 shocks have taken care of that to a significant degree (although I couldn't tell you why from a technical POV).

I do know that my times have improved towards FTD with the same group of folks I run with this year over last year. Hopefully some of that is my driving skills, but I think part of it is the Z06 shocks.

I don't have any experience with the Bilstein sports in an autox environment, but on the street they feel very similar to the Z06 shocks.

HTH, and have a good one,
Mike
Are you saying you used '04 Z06 shocks with stock Z51 springs and swaybars for autocross? I was thinking of doing that on my '99 FRC but wasn't sure if they would work that well with a different spring rate than they were designed for.
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Old Aug 13, 2007 | 01:43 PM
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Well, I got to try out my set-up this weekend. Z51 sway bars front/rear and C6 Z06 shocks, KDW2s. I was right in there with the Z06 times and did very well.. specially considering this was my first autocross. I didn't "beat" everybody, but I was in the top ten and the second fastest coupe. The car handled perfectly.. the driver needed bigger gonads.

Oh, there were tons of guys (and girls) that also said it was their "first" time out... ya, it was their first time out, in a corvette... on THAT day.. with the sun in THAT position. One guy said his first time out, then later fessed up that he'd been running porsches for years.
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Old Aug 13, 2007 | 10:29 PM
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Originally Posted by jabrun
Are you saying you used '04 Z06 shocks with stock Z51 springs and swaybars for autocross? I was thinking of doing that on my '99 FRC but wasn't sure if they would work that well with a different spring rate than they were designed for.
Yes, that's what I'm running. I don't know I'm that good of a driver to tell if they're mismatched or not.

Have a good one,
Mike
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Old Aug 13, 2007 | 11:38 PM
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Originally Posted by INTHERED
My C6 Z06 shocks just arrived can't wait to put them on my C5. Should I reuse the original nut, retainer and insulater from the front shocks or purchase new parts ?

Thanks >>>>> INTHERED
A word of caution to those who think thay want to put C6 Z06 shocks on their C5. You can put them on but you can not lower your C5. This is according to to Gene at GM Parts Direct. I hope this helps.

Roger T
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Old Aug 15, 2007 | 03:48 PM
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Originally Posted by ltborg
yeah shocks can do that. i dont know whether setting your ride height without shocks is the answer though. they have a gas charge in them which acts like a spring so technically, depending on the strength of the charge, it can raise your ride height a decent amount.
The C6 Z06 shocks are on and checking the ride height with the shocks off of the car was a complete waste of time. The driver side rear of the vehicle is 1/2 inch higher then the passenger side rear with or without shocks on and I can't seen to figure out why. Should I have large differences in the rear height adjuster settings between DS and PS ?
What do you autocross guys set your ride height wedge to ?

Thanks >>>>> INTHERED
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Old Aug 16, 2007 | 11:22 AM
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I dropped my front end (stock bolts) and do scrape a tiny bit 'o tire but not bad. I'll put it back up a little. The website does say that they don't reccomend lowering it with the C6 Z06 shocks. I'm not sure why cuz it seems to work fine (other than the little tire rub once in a while).
This was shot last weekend.

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Old Aug 16, 2007 | 12:42 PM
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Originally Posted by INTHERED
The driver side rear of the vehicle is 1/2 inch higher then the passenger side rear with or without shocks on and I can't seen to figure out why. Should I have large differences in the rear height adjuster settings between DS and PS ?
What do you autocross guys set your ride height wedge to ?

Thanks >>>>> INTHERED
You need to measure your ride height to figure out if the differences are correct or not. The best way to do it is at the front and rear cross members, but unless you've got access to a 4-post lift that's just about impossible. An alternative point is at the four tie down points. You'll find those underneath the rocker panels, right around the door hinge line and the door handle.

Drive the car onto a flat (not necessarily level) floor, then measure the distance to the tie down points. I used a popsicle stick to measure the height by putting the stick up into the tie down slot and marking the stick. Obviously you should be close to equal left to right. Less obvious is the need to have the front tie down points about a half inch lower than the rear. This will be a close approximation of the correct rake angle.

HTH, and have a good one,
Mike
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Old Aug 16, 2007 | 07:25 PM
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Originally Posted by Roger T
A word of caution to those who think thay want to put C6 Z06 shocks on their C5. You can put them on but you can not lower your C5. This is according to to Gene at GM Parts Direct. I hope this helps.

Roger T
I had C6 Z06 shocks on for over a year. My car is just a little lower then the stock bolts at the lowest setting. They work great. If you use your old bushings you will get more travel in the back. The front will be the same.
I use my car for autocross and track days only. I now have double adjustable Penske's, but would have no problem in going back to the C6 Z06 shocks. I also run the VB&P Springs. #966 front. #750 rear.

Steve
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Old Aug 21, 2007 | 12:47 PM
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[QUOTE=Todd157k;1561479586]Well, I got to try out my set-up this weekend. Z51 sway bars front/rear and C6 Z06 shocks, KDW2s. /QUOTE]

What was the part number on your C6 Z06 shocks ?
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Old Aug 21, 2007 | 01:02 PM
  #35  
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Gene Culley has a post in C5 Parts and has them on sale again. Check it out.


http://forums.corvetteforum.com/show....php?t=1776553

||--Genuine GM C6 Z06 Shocks--||

10313647 – Z06 Front Shocks
10318361 – Z06 Rear Shocks

Both sets of front and rear shocks (4) 233.17 shipped.
For the shocks on our website, use part number c6z06shocks under Chevrolet make.

The C6 Z06 shocks will work on C5’s without modification. Not recommended for C5’s that are completely lowered on stock bolts.
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Old Aug 21, 2007 | 03:21 PM
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My coupe has Hotchkis sway bars Z06 Springs and Bilstien sports.
It runs great autocrossing. To me the street ride is fine also being it is a Vette. If you do a search you should find that bilstien sports are better if you lower your car because the Factory shocks can bottom out.
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Old Aug 26, 2007 | 06:38 AM
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The C6 Z06 shocks will work on C5’s without modification. Not recommended for C5’s that are completely lowered on stock bolts.
Very good discussion guys, im considering the '07 C6 Z06 Shocks for my C5 Coupe, and Im lowered past the stock bolts, not much but just a little bit, so why is it that its not recommended for the C5's? Does anyone actually know why? is it because compressing the shocks makes them too stiff for the ride height of the car?
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Old Aug 27, 2007 | 09:39 AM
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Originally Posted by Brodiemans
Very good discussion guys, im considering the '07 C6 Z06 Shocks for my C5 Coupe, and Im lowered past the stock bolts, not much but just a little bit, so why is it that its not recommended for the C5's? Does anyone actually know why? is it because compressing the shocks makes them too stiff for the ride height of the car?
I find it hard to believe that the C6 Z06 shocks would not function properly with the car lowered. I mean how would the car function when there is a light driver compared to a heavy driver and a heavy passenger ? My car is lower somewhat and my shocks work fine.

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Old Aug 27, 2007 | 08:24 PM
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The C6 Z06 shocks work great on a lowered C5. I'm a little lower then stock bolts too. I'm now on Penske double adjustable shocks. My times are no better right now. The car feels better, but with no results yet. These C6 Z06 shocks are around $200. It's really a no brainier what shocks to use.

Steve
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Old Aug 28, 2007 | 10:13 AM
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For autocrossing/HPDE the C5 Z06 shocks for 2004 have better valve damping than earlier shocks and the C6Z shocks. This is especially true in higher speed transitions and chicanes. The Koni shock would be a slight upgrade from the 2004Z. More important is the alignment, corner weights and wedge. Just changing shock and lowering the car will not give you optimum handling.
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