springs/tire size - Team Camaro Tech
Brakes, Suspension & Steering Conversion questions, Steering & Handling

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post #1 of 3 (permalink) Old Aug 11th, 03, 02:21 AM Thread Starter
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Join Date: Apr 2001
Location: Southern NH
Posts: 1,052

Hello, I am trying to decide on springs and rear tires for my 69z28. I have already checked David Pozzis website for spring rate information, but can't quite find what I'm looking for since it is geared more towards road racing. My car is a 69z28 smallblock,muncie 12 bolt. I need to fit a 275/60/15 on the rear to make it to and from the track as well as race. It currently has multi leafs and j-bolt traction bars. I am not looking to raise it into the clouds just fit the tires for weekend racing. Eaton can only tell me the 4 leafs will be slightly shorter. What is everyone else running with a similar combo?
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post #2 of 3 (permalink) Old Aug 11th, 03, 07:20 AM
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Join Date: Oct 2002
Location: I dont know
Posts: 2,045

Uhm, if you are going 'Road Racing' you'll want to ditch the J-Bolt traction bars. They will have an adverse effect on handling, especially with the soft spring rates you are using.

Your rear spring rate is/should be determined from and with your front spring rate in mind. But with a tire of that size and the ride height issues you have, the required spring rate is going to be more than what you can get from an off the shelf spring.

As I stated, this really has to be figured with your front spring in mind.

David has considerable Road Racing experience along with lot os cone killing time and the spring rates are going to be VERY similar in either instance.

I myself run a 700ish lb front spring and run a 300ish lb rear spring. The 67 has seen a few tracks in its years and this has been the best, balance wise for serious steet driving as well as for a high speed road course. And I think David and I are on roughly the same page when it comes to these spring rate numbers and the Camaro chassis. This would be where I would start, but I dont know your chassis set-up to give you a true recommendation. I would need to know just about everything to get the weights right and balanced.

Upon knowing that, I will say that it is going to take a set of custom springs. And we (Team Camaro) have a group purchase going on at a spring shop, for the purchase of a spring that I think would be just what need.

Take a look at this thread, it talks about the purchase along with some technical info:

Leaf Spring Discussion

If you have any questions, feel free.
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post #3 of 3 (permalink) Old Aug 11th, 03, 09:35 AM Thread Starter
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Join Date: Apr 2001
Location: Southern NH
Posts: 1,052

Thank you but I think I may have confused the issue. My intension for the car is stock looking car that I can change the rear tires, and go drag racing occasionaly. I also have set of 72 camaro model, Rancho leafs but don't know if they'll fit. Anyone know if they'll fit?
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