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My daily-driven 2001 now has about 55K on it and I'm considering a suspension freshening/upgrade. Considering getting involved in a very occasional auto-x in the future. Are the GM Sachs 2004 Z06 shocks my best bet or should I consider some aftermarket shocks like Bilsteins? Is there anything else that I should be looking at freshening/upgrading in the suspension? Thanks in advance!
Do a search on 04 Z06 shocks and Bilstein shocks. This has been discussed and debated over and over again.
For a relatively small investment and a bolt and go application the 04Z shocks or Bilstein sports are the two logical choices for a performance increase.
That depends on whether or not your car is lowered. If not, the '04 shocks would be fine. If you are lowered or contemplating doing so, then you should go for the Bilstein Sport shocks. They work better on lowered cars. BTW, lowering is easy and no cost. It will definetely enhance your handling and looks. There is almost no sacrifice in drivability other than ground clearance at curbs.
That depends on whether or not your car is lowered. If not, the '04 shocks would be fine. If you are lowered or contemplating doing so, then you should go for the Bilstein Sport shocks. They work better on lowered cars. BTW, lowering is easy and no cost. It will definetely enhance your handling and looks. There is almost no sacrifice in drivability other than ground clearance at curbs.
"LOWERED" up to 10 or 12 mm (1/2") is fine, and recommended bythe factory for use with the 04 Shocks. Lower below that at your own risk as the Z06 suspension is out of it's ideal geometry, and will not work (handle) as well no matter what shock you run.
My advice would be to look at this issue on the roadrace and autocross forum. Most racers/autocross prefer the 04 shock's rebound control for stock suspension cars.
That depends on whether or not your car is lowered. If not, the '04 shocks would be fine. If you are lowered or contemplating doing so, then you should go for the Bilstein Sport shocks. They work better on lowered cars. BTW, lowering is easy and no cost. It will definetely enhance your handling and looks. There is almost no sacrifice in drivability other than ground clearance at curbs.
I bought the car used about a year ago from a dealer. How can I tell if it has been lowered? Some of the roads are so bad here in Panama City Beach it seems like I already scrape the front airdam just about everywhere I go, let alone driveways or speed bumps!
"LOWERED" up to 10 or 12 mm (1/2") is fine, and recommended bythe factory for use with the 04 Shocks. Lower below that at your own risk as the Z06 suspension is out of it's ideal geometry, and will not work (handle) as well no matter what shock you run.
My advice would be to look at this issue on the roadrace and autocross forum. Most racers/autocross prefer the 04 shock's rebound control for stock suspension cars.
Is that info you read or do you have personal experience regarding that advice? After lowering my car on stock bolts, which gave about 1" lowering, I had my suspension aligned and set-up by the shop that does alot of suspension develpoment for GM and races C5's sucessfully, winning several SCCA championships. John Heinricy, GM head of performance suspension development drives for them. I mention this because of their credentials, they did a thorough going over of all facets of alignment, ride height and corner weighting. After their work, my car handles and sticks to the road like a cat climbing drapes. Plus, with the Bilstein Sports the ride is still comfortable and does not beat you up at all. Aside from performance driving, my car is also a daily driver. I use it even for commuting to work and it now has about 55,000 miles. It's an '03 Z06.
I bought the car used about a year ago from a dealer. How can I tell if it has been lowered? Some of the roads are so bad here in Panama City Beach it seems like I already scrape the front airdam just about everywhere I go, let alone driveways or speed bumps!
You would have to check either the space from the top of the tires to the wheel well opening or the more difficult but accurate way is to look at the suspension adjustment bolts. On the front there should not be too many threads exposed if at stock height. If all threads are showing and the bushing is up against the control arm, then it's been lowered. The rear is the opposite. If the top of the bolt has no threads showing, it's been lowered. Stock, it will have at least about 1/2" showing (unless the rear bolts have been changed). If your car was lowered you will scrape alot, sounds worse than it really is, it's usually just the replaceable plastic front spoilers. Don't remove them though, they are essential to engine cooling. Basically though, from a distance, does your car look too high over the tires, almost like a 4x4? Stock, the space above the tire will be greater than the space in front and back of the tire. If it's even all around it's lowered.
Is that info you read or do you have personal experience regarding that advice? After lowering my car on stock bolts, which gave about 1" lowering, I had my suspension aligned and set-up by the shop that does alot of suspension develpoment for GM and races C5's sucessfully, winning several SCCA championships. John Heinricy, GM head of performance suspension development drives for them. I mention this because of their credentials, they did a thorough going over of all facets of alignment, ride height and corner weighting. After their work, my car handles and sticks to the road like a cat climbing drapes. Plus, with the Bilstein Sports the ride is still comfortable and does not beat you up at all. Aside from performance driving, my car is also a daily driver. I use it even for commuting to work and it now has about 55,000 miles. It's an '03 Z06.
Good information. It wouldn't have made sense for the factory designed height adjustability to stray beyond the cars ability to use it.