C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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lowering my '81

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Old Jul 3, 2009 | 12:06 AM
  #21  
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Originally Posted by bedlam
awesome. thanks. i understand. i remembered how the leaf went in, but didnt quite realize the tension thing with longer/shorter bolts.




thanks for the input!
i wont be doing the cutting myself, as ive never done it before and want it done right. i found a corvette shop in dallas, and emaild them on a quote for having them cut.

i need to upgrade the front shocks though right? or are the OE ones good enough. cause they are new. if so, anyone try the KYB GR-2s? i had them on my accord before i went with adjustable dampers, and was kinda on the fence with em. and the bilsteins are expensive. lol.

-roy
I like my KYB GR2's. I've had them on my 80with the 330 lb rear composite spring, oem suspension and stock 15 inch wheels for 6 years. No complaints, with spirited driving. But I think you'll find that a lot of guys on this forum are dedicated to the Bilsteins.
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Old Jul 3, 2009 | 06:01 PM
  #22  
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I just put 550# spring on my front and it dropped it about 1". I've never heard of the 550s raising the car. Everything I read is they lower. I guess it depends on the spring configuration. I think you can buy longer bolts for the rear for about $20 from most suppliers. Call Dan or Russ at VanSteel, they can help you get what you need.
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Old Aug 5, 2009 | 08:19 PM
  #23  
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so 550lb spring is the same as the 550#?
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Old Aug 5, 2009 | 11:06 PM
  #24  
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Yes, check out Vette Brakes & Products. They are a sponsor and are very knowledgeable when it comes to brakes and suspension for these cars. If you got deep pockets, they can set ya up. Not meaning they are expensive, but they have so much to choose from. I have the 550lbs coil springs on my car. They dropped it about an inch or maybe a little more. Ive got maybe 1.25 inches from the top of the tire to the fender lip. I have some longer bolts for the rear but have not installed them yet. I took my measurements before I took the rear apart. I am hoping for at least a 1.5 inch drop in the back.
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Old Aug 6, 2009 | 03:20 AM
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Good lookin' CG5. I have one too as well as an 81' coincidentally.
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Old Aug 6, 2009 | 07:28 AM
  #26  
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Originally Posted by bluegtp

so, installing longer bolts relieves the spring of tension which in turn lowers the car. the shorter bolts put more tension on the spring by straightening it out and raises the car.



I hope this makes sense, it's 1 a.m. so someone correct me if i'm wrong!
Okay. Your wrong.
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Old Aug 6, 2009 | 07:54 AM
  #27  
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bluetgp: The use of longer bolts lowers the resting point of the spring ( and connected body ) relative to the axle, thus lowering the car. This relationship has no material bearing on the tension applied to the spring.

Bedlam: Some people use the # to mean lbs (pounds). Those are some nice looking cars!
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Old Aug 7, 2009 | 01:39 AM
  #28  
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Originally Posted by Leung
Good lookin' CG5. I have one too as well as an 81' coincidentally.
sweet. i love it. great car. have you upgraded yours at all?

Originally Posted by RobbSalzmann
Bedlam: Some people use the # to mean lbs (pounds). Those are some nice looking cars!
oooooh yeeeeah. i didnt even relate those two. haha.thanks for connecting the dots for me. i promise im not THAT stupid.:o
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