Spring sizes?

cstreit · cstreit's Garage

Hey gang,

I'd rather not buy someones "kit" to lower the 993 because the prices are way to high than just buying a set of springs...

Is there a standard measurement for the 993 springs? THey are Obviously not a standard cylindrical spring, but can the be replaced with one?

Thanks,

chris

ANTONIO · 07-31-2005, 06:50 AM

Hey Chris,
What ever you do don't replace it for a non-progressive spring, use a progressive spring, H&R's are a good choise for the std. Monroe shock.,cheers, Antonio.

cstreit · cstreit's Garage

Thanks Antonio.

They sure are priced high compared to a standard spring, but I understand...

kang · 07-31-2005, 08:20 AM

What are you trying to accomplish? Just lowering? Will you be driving at the track? Autocross? Spirited street driving?

While the ROW M030's aren't as low as H&R's, they are progressive, and you won't end up with bump steer issues, scraping the nose, etc. They work well with Bilstein HD's.

I'm not sure I understand your question about a standard measurment. Are you looking to find a spring that is X inches long and Y inches in diameter and use some sort of generic spring like that? That won't work. You'll have to pick a brand, H&R, Eibach, Porsche M030, etc, and buy a set of four for your year, model, etc.

cstreit · cstreit's Garage

Kang,

Well in a perfect world yes I would prefer to use a "standard spring" bcause of cost, tunability, and availability. I have dealer accounts with Hyperco so I get them cheap.

I'm fairly well aquainted with spring rates, types, etc.. as i've built custom suspensions before (such as the custom coilover setup on my racecar). I'm new to post 964 world though, so I didn't know if non-progressive "standard" springs had been used on the 993 in a street setting.

The car is going to be 95% street as we have a dedicated racecar so there is no need for hyper agresive setups... My goal is 1) Lower the car. It looks like a tractor to me, and 2) any performance improvement is gravy. I need to re-align the car anyway (prior owner has it twitchy for street) so now is the time to do this.

kang · 08-01-2005, 02:39 PM

I've never heard of anyone using any sort of generic spring. It's always a set by one of the makers, H&R, etc, for a given make and model. Good luck if you want to go this route. A set of four springs can be had for <$400, I don't know what a set of "standard" springs would cost, if even a set exists.

cstreit · cstreit's Garage

Any racing catalog covers these. They come in varying lengths (5-10"), widths (1.5-4.0") and poundage (anything you want)...

For example: http://www.pegasusautoracing.com/ProductSelection.asp?Product=185

I have tons of sets for my racecar. The rear alone has 5 different spring rates...

kang · 08-02-2005, 10:54 AM

Interesting. But the cheapest spring I saw on that list was $133 each. A set of four ROW M030 will be less than $133 * 4.

I'd guess the only way you could find out the size would be to remove a set and measure them.

cstreit · cstreit's Garage

I get them for a LOT less than that....

...but none of these are progressive springs, so the point is moot anyway...

DJF1 · 08-02-2005, 10:24 PM

The Euro M030 is using progressive springs. My point is are you sure you want to use the stock shocks on this? Usually the stock shocks are shot within 20K miles. I changed mine to an H&R coilover and it transformed the car. Unless your shocks are new I would spend the money for a set of Bilstein HD's. Then you can use your generic springs without an issue.