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jaredclawsonOffline
Post subject: Specs for coil over shocks  PostPosted: Mar 04, 2013 - 12:56 AM
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I am ready to order my coil over shocks, but I want to get it right the first time. I need to know the overall length, the compressed length, and the recomended spring length. So far, after reading the posts I could find, I think I want a 9-10" springs on the front, and 8" springs on the rear. I am sure I want bearing ends vs. eyelet or bushing, but I still am not sure on the overall length and the compressed length. Any help would be appreciated. Thanks.
 
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RTOffline
Post subject: RE: Specs for coil over shocks  PostPosted: Mar 04, 2013 - 02:17 AM
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When using bearing ends on your shocks or "A" arms instead of rubber or plastic bushings a lot of even the smallest "grains of sand" that you drive over will be transmitted into your frame and you will feel and hear them. If the car is a track machine only, the bearings are worth it for a more precise control but a street driven car with bearings (such as spherical rod ends) could be very annoying.
The shocks are less likely to transmit the shock only because the shock by nature has a damping effect in their use.
Just a thought.

RT

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daywilmOffline
Post subject:   PostPosted: Mar 04, 2013 - 02:42 AM
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Spring length will depend on the type of chassis you are using so yours may not be the same as mine, however I used 11" springs on the rear of my replica frame but believe I would be better off with 9" or 10". On the front I used 9" and they are perfect. Spring rates are always a matter of discussion but for replica frames I think Jim Dinner has it all figured out -- 2 X 450# on the front and 4 X 250# on the rear. I'm using Heidt's shocks. If I didn't have them mounted already I'd measure the overall length and the compression length. Hopefully someone else can provide this for you. I want to say overall length was 14" but don't hold me to it.

Mike
 
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jdinnerOffline
Post subject:   PostPosted: Mar 04, 2013 - 11:05 AM
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I got my Heidts Shocks from Horton Hot Rod here in Ontario. They are
10" compressed, 14.5" extended, rubber bushings with steel inserts. I had to change out the front shock bushings with nylon. Too much pressure for the rubber and they wore out quickly.
The front springs are 450# X 10". The rears are 250# X 11".
All I can say is, it works and I am very pleased with the performance on the road.

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jaredclawsonOffline
Post subject:   PostPosted: Mar 04, 2013 - 05:42 PM
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Thanks for the input. Rt, I was thinking of going with bearing ends for durability not as much as for performance, as I had read about Jim's issue with the shock bushings. I want a quiet suspension, so I am going with rubber bushings in the a-arms.

Take a look at the link to these shocks: http://www.speedwaymotors.com/Garage-Sale-AFCO-Eliminator-Coil-Over-Shock-Single-Adjustable-5-Inch-Stroke,67161.html

Would they work? Is there something cheaper that will work just as good or better?

Thanks, Jared.
 
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AdrianBurtonOffline
Post subject:   PostPosted: Mar 04, 2013 - 09:04 PM
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I wouldnt use that shock Jared, it is a drag shock it is going to be very loose on rebound.

The rebound adjustment is the most critical in tuning a drag racing set-ip. This adjustment allows the tuner to dial in the "unloading action" of the chassis and keep the tires planted during the critical first 60' down the track.

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RTOffline
Post subject:   PostPosted: Mar 04, 2013 - 11:14 PM
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Jared, you will be fine and like the ride with the rubber (or cushioning) "A" arm bushings. The shock mounts are less important as to transmitting road noise.
I did see a build a long time ago that use spherical rod ends for the suspension "A" arms.
The entire suspension was built like a track car.
I can only imagine what that ride was like.
Keep us informed. We are all "hooked" on builds.

RT

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jaredclawsonOffline
Post subject:   PostPosted: Mar 05, 2013 - 12:41 AM
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Wow, getting used to posting is fun! I just typed a big long post and lost the whole thing. I was typing: I didn't know that was a drag shock. I spoke with a tech on the phone, who explained how to set up shocks. I need to know the shock length at the vehicles ride height with the vehicle "weighted" or sitting on its own weight. Then, with that length, there is a corresponding stroke, I think for our purpose it is a 4 inch stroke. Now, knowing the shock length at ride height, you want to set up the car with the shock at about 40% of its collapsed length, which will allow for 60% upward travel, and 40% downward travel.

He went on to explain that a higher spring rate uses a shorter spring for the same length of shock. This is because a stiffer spring has tighter coils, and compresses to max sooner. I noticed that NAERC called for 8" 400 lb springs up front and 10" 250 lb springs in the rear using the same shock front and rear. This makes sense with what the tech explained. He then recommended this shock:

http://www.speedwaymotors.com/Carrera-Front-Coilover-Shock-Kit-225-Spring-Rate-11-1-2-Inch-Mounted-Lt,36438.html

What do you think?
 
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jaredclawsonOffline
Post subject:   PostPosted: Mar 05, 2013 - 01:15 AM
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jaredclawsonOffline
Post subject:   PostPosted: Mar 05, 2013 - 01:17 AM
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Getting excited! My rotors came in today.
 
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