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Z06 Front spring upgrade on a GS ?

 
Old 06-07-2019, 11:34 AM
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Monks
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Default Z06 Front spring upgrade on a GS ?

The front spring on my GS seems soft and many have said it is soft for autocross or HPDE.
Hyperco spring upgrades are $550, so I looked at the Z06 front spring, as I was told the Z06 is much stiffer ride
and would be a nice upgrade. I also have a friend with a very cheap one
Looking at the C6 front spring rates, the GS has a Z51 spring rated at 526 lbs., and the Z06 is rated at 531 lbs.
This doesn't make sense, Why would GM make two springs with different part numbers that are almost identical spring rate ?
Can anyone confirm that a Z06 front spring would be a good upgrade, even though the specs only show a 5 lbs difference in spring rate?

Thanks!

Last edited by Monks; 06-07-2019 at 09:38 PM.
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Old 06-07-2019, 06:24 PM
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sallen619
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531 lbs - 426 lbs = 105lbs

Is the 426 lbs a typo?

Check the ZR1 spring rate. I'm assuming it is higher due to the weight of the supercharger...
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Old 06-07-2019, 07:26 PM
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The GS and Z51 use the same front spring ... I understand this spring is rated at 526 Lb Rate
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Old 06-07-2019, 07:29 PM
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In fact, here is the parts that make up the GS / Z16 suspension and there source ...


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Old 06-07-2019, 07:35 PM
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Mike's LS3
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Originally Posted by Turbo6TA View Post
The GS and Z51 use the same front spring ... I understand this spring is rated at 526 Lb Rate


GS/Z51 Z06
F 526 531
R 645 782

You beat me to it!

Last edited by Mike's LS3; 06-07-2019 at 07:38 PM.
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Old 06-07-2019, 09:39 PM
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Originally Posted by sallen619 View Post
531 lbs - 426 lbs = 105lbs

Is the 426 lbs a typo?

Check the ZR1 spring rate. I'm assuming it is higher due to the weight of the supercharger...
Yes, a typo, should have been 526 lbs GS spring 531 Z06 spring
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Old 06-09-2019, 11:34 AM
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madmatt9471
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Originally Posted by Mike's LS3 View Post


GS/Z51 Z06
F 526 531
R 645 782

You beat me to it!
Are you saying the Z06 has a 782 lb Rear Spring? I have seen so many varying numbers that I'm glad to see the 782!

If so do you have the part number off hand?

Thanks,Matt
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Old 06-09-2019, 03:26 PM
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Mike's LS3
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Originally Posted by madmatt9471 View Post
Are you saying the Z06 has a 782 lb Rear Spring? I have seen so many varying numbers that I'm glad to see the 782!

If so do you have the part number off hand?

Thanks,Matt
Yes, 782 is the rear spring rate listed for C6 Z06. GM lists 6 different rear spring part numbers. Spring rates vary with transmissions because of weight. However, the C6 Z06 came from the factory with only a manual transmission. So you can eliminate any spring described as soft ride and auto transmission. Since you have a GS, you can eliminate that spring part number from the list. West coast corvette list the 2006-2013 C6 Corvette Z06 rear spring as GM #15233392. So, I am putting my money on that part number for the Z06.


Post on the C6 Z06 forum and ask for the rear spring part # to confirm.
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Old 06-10-2019, 12:01 AM
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My original question was why would GM make a Z06 front spring that is only 5 lbs more than the Z51/GS front spring?

Some racers say the Z06 front feels much stiffer that the Z51/GS front spring. Maybe feels better because the Z06 is 100's of pounds lighter.

I am wondering if the Z06 front spring would be a nice cheap upgrade for a GS front spring?
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Old 06-10-2019, 04:29 AM
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Not worth the effort for such a small change in spring rate. You'll benefit from a larger sway bar and better shocks like the Bilstein's by DRM. The GS is the heaviest of the C6's and better dampening help it a lot.
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Old 06-10-2019, 08:50 AM
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What makes you believe the spring feels soft? Also, have you tried to confirm your front spring? I have evidence that shows, at least on a 2009, that the factory installed a non-Z51 front spring in a Z51 optioned car.
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Old 06-10-2019, 10:47 AM
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Originally Posted by C5Natie View Post
Not worth the effort for such a small change in spring rate. You'll benefit from a larger sway bar and better shocks like the Bilstein's by DRM. The GS is the heaviest of the C6's and better dampening help it a lot.
That is my plan. The guy I am buying shocks (likely Koni 3013's) and sway bar (35mm solid) from also recommended a stiffer front spring, a Hyperco HPT. He raced
a GS and thought the springs were way too soft on the front.

I must admit that I have not taken this car on the track yet, Just trying to get it ready. I plan to run it with shocks and sways, then decide from there on the front spring.

Last edited by Monks; 06-10-2019 at 10:56 AM.
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Old 06-10-2019, 10:52 AM
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Originally Posted by PCMusicGuy View Post
What makes you believe the spring feels soft? Also, have you tried to confirm your front spring? I have evidence that shows, at least on a 2009, that the factory installed a non-Z51 front spring in a Z51 optioned car.
My last car was a C5 with DRM coilovers and light springs, My GS feels soft compared to that. I have talked to a few
autocrossers and the ones that can change it in their class do, even on street tires.

I will confirm my spring on Wednesday, when my Quick Jack 5000 arrives from Costco ( $999 on sale til the 16th)
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Old 06-10-2019, 12:39 PM
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Originally Posted by Monks View Post
My original question was why would GM make a Z06 front spring that is only 5 lbs more than the Z51/GS front spring?

Some racers say the Z06 front feels much stiffer that the Z51/GS front spring. Maybe feels better because the Z06 is 100's of pounds lighter.

I am wondering if the Z06 front spring would be a nice cheap upgrade for a GS front spring?
For the same reason GM made the base rear spring rate 12 lbs stiffer than the Z51 rear spring 657 lbs. vs 645 lbs. respectively. . GM engineers designed a suspension package that achieves a desired ride quality using a combination of components: Shock valving, Springs, Sway bars and tires all of which differ from base to GS/Z51 to Z06 to ZR1. For example: Just by changing the spring rate or sway bar diameter you can encounter too much or too little oversteer or understeer. Suspension components work together and by changing only one suspension component you may not be doing yourself any favors in handling and ride quality. GM changes spring rates, shock valving and sway bar thicknesses to fine tune a suspension for that particular package.

Last edited by Mike's LS3; 06-10-2019 at 12:41 PM.
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Old 06-14-2019, 02:23 PM
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Originally Posted by Monks View Post
That is my plan. The guy I am buying shocks (likely Koni 3013's) and sway bar (35mm solid) from also recommended a stiffer front spring, a Hyperco HPT. He raced
a GS and thought the springs were way too soft on the front.

I must admit that I have not taken this car on the track yet, Just trying to get it ready. I plan to run it with shocks and sways, then decide from there on the front spring.
I wish Hyperco would have stated the spring rates for HPT series, you may have to change both front and rear to try to stay close to a balanced suspension. As an aside, the GS did seem to have a softer suspension than even the Z-51 made previously, and the car seemed to float on the track, though it does corner flatter in stock trim due to the Z-06 sway bars most likely. Sudden oversteer did seem to come up as I had a couple of occasions had to recover while on track, once in the rain and once on a dry track. It was a little spookie. I've since upgraded to the JOC package, shocks and sways, but may have to do springs too just to get back to neutral steering.
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Old 06-15-2019, 12:28 AM
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Originally Posted by mikeCsix View Post
I wish Hyperco would have stated the spring rates for HPT series, you may have to change both front and rear to try to stay close to a balanced suspension. As an aside, the GS did seem to have a softer suspension than even the Z-51 made previously, and the car seemed to float on the track, though it does corner flatter in stock trim due to the Z-06 sway bars most likely. Sudden oversteer did seem to come up as I had a couple of occasions had to recover while on track, once in the rain and once on a dry track. It was a little spookie. I've since upgraded to the JOC package, shocks and sways, but may have to do springs too just to get back to neutral steering.
A national champion racer recommends good shocks, big front bar, stock GS rear bar, and the Hyperco HPT spring in front. Has used this and said it works great.
I am looking to try a Z06 front spring, they are cheap to try.
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