Technical Tips > Brakes, Suspensions, Steering, Wheels & Tyres

posted on 1-1-1970 at 10:00

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Vette Obsessed:

--- Quote ---Originally posted by StingraynutThose tyre sizes from Vette Obsessed – it should be 275 (x 40 x 17) not 245
 
--- End quote ---


Well spotted S'nut.  Sorry for the typo guys.

Have you checked the suspension chart link earlier in the thread?

This one: http://www.zr1.net/ZR1_suspension.html

That gives you all the OEM spring rates on all the different model C4's.  If you don't have a readily accesible build sheet or window sticker for your car, you can find out what suspension your car has by checking under the console door and cross checking the option codes.  Among the many codes printed there, one will be the suspension option your car has.

I have heard some guys report their ride has improved by changing shocks - haven't heard about the ones you refer to though.  You can also get the factory Bilsteins revalved as well.

Another (more expensive) option is to install softer springs (like convertible spec springs).

SAVette:
Sorry if this link has been mentioned before in this thread (or any other....) but have you had a look at:

http://corvetteactioncenter.com/tech/c4/susp_chart.html

The whole of http://corvetteactioncenter.com is worth checking out as a matter of fact. The above links should explain some of you questions about the Z51 handling package. Just as an aside, having a look at some of those numbers might help explain why the '84 copped the reputation of having HARD suspension Especially the Z51!

While I'm here, can some please explain to me what advantage you would get from using a bigger rim on the back, but the same size tyres all round. The '84 Z51 package (like mine) had 8.5" rims front with 9.5" rims rear, but it had 255/50VR16 all round. Did it just give you scope for using a bigger tyre if you wanted to or is there some tyre-wall flex techo thing I'm not aware of?

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