85 Rear Coilover mod
Thread Starter
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
I thought I would update my rear install info ,
I went from 10"-275# to 10"-350# springs and it was a huge improvement, at a 27" ride height I don't bottom out any more and the ride is not as soft and bouncy as the 275's,,
with the 275's if I set the shocks stiff the ride on my car was harsh, and if I softened up the shocks then it would bottom out on interstate dips.
I really really like it a lot the way it is now.... now on dips it does great ..
The coil over system is so sweet, you can pop in new springs for $80 a set and adjust the ride height to your desired height
2nd page down shows some corvette shock weight info
http://www.qa1.net/qa1_motorsports/i...etrod_tech.pdf
I went from 10"-275# to 10"-350# springs and it was a huge improvement, at a 27" ride height I don't bottom out any more and the ride is not as soft and bouncy as the 275's,,
with the 275's if I set the shocks stiff the ride on my car was harsh, and if I softened up the shocks then it would bottom out on interstate dips.
I really really like it a lot the way it is now.... now on dips it does great ..
The coil over system is so sweet, you can pop in new springs for $80 a set and adjust the ride height to your desired height
2nd page down shows some corvette shock weight info
http://www.qa1.net/qa1_motorsports/i...etrod_tech.pdf
Melting Slicks
Joined: Dec 2000
Posts: 2,719
Likes: 60
From: Fremont Oh
I thought I would update my rear install info ,
I went from 10"-275# to 10"-350# springs and it was a huge improvement, at a 27" ride height I don't bottom out any more and the ride is not as soft and bouncy as the 275's,,
with the 275's if I set the shocks stiff the ride on my car was harsh, and if I softened up the shocks then it would bottom out on interstate dips.
I really really like it a lot the way it is now.... now on dips it does great ..
The coil over system is so sweet, you can pop in new springs for $80 a set and adjust the ride height to your desired height
2nd page down shows some corvette shock weight info
http://www.qa1.net/qa1_motorsports/i...etrod_tech.pdf
I went from 10"-275# to 10"-350# springs and it was a huge improvement, at a 27" ride height I don't bottom out any more and the ride is not as soft and bouncy as the 275's,,
with the 275's if I set the shocks stiff the ride on my car was harsh, and if I softened up the shocks then it would bottom out on interstate dips.
I really really like it a lot the way it is now.... now on dips it does great ..
The coil over system is so sweet, you can pop in new springs for $80 a set and adjust the ride height to your desired height
2nd page down shows some corvette shock weight info
http://www.qa1.net/qa1_motorsports/i...etrod_tech.pdf
MO
Thread Starter
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
Today I ordered the 10-400 lb QA1 coils,
Last year, I was so impressed with the improvement in going from 275# to 350# coils I figured I would stiffen the rear up one more notch.
the stiffer 350 lb coils which I installed last year, 99% eliminated the bottoming on on dips when I had the ride height dialed in low, so I am sure that I can put the ride height where I want it and not fear slamming the rear on dips.
Coil-Over Spring, 400 lbs./in. Rate, 10 in. Length, 2.5 in. Diameter, Silver Powdercoated
Last year, I was so impressed with the improvement in going from 275# to 350# coils I figured I would stiffen the rear up one more notch.
the stiffer 350 lb coils which I installed last year, 99% eliminated the bottoming on on dips when I had the ride height dialed in low, so I am sure that I can put the ride height where I want it and not fear slamming the rear on dips.
Coil-Over Spring, 400 lbs./in. Rate, 10 in. Length, 2.5 in. Diameter, Silver Powdercoated
Last edited by LD85; Mar 29, 2012 at 06:40 PM.
Melting Slicks
Joined: Dec 2000
Posts: 2,719
Likes: 60
From: Fremont Oh
Hey LD85,
I have been running #300's in the back of mine since the beginning, and have been satisfied with about 3-4 clicks on the shocks.
I agree #275's would be a bit soft, I found it to be similar in feel as well, by moving up the spring rate the car would really feel good. You should be very happy with the #350's for sure.
Figure with about 125 pounds of fuel against the #275 your ride height would vary almost a 1/2" from full to empty. Now should be less than about 3/16".
I'm glad you are happy with the setup.
MO
I have been running #300's in the back of mine since the beginning, and have been satisfied with about 3-4 clicks on the shocks.
I agree #275's would be a bit soft, I found it to be similar in feel as well, by moving up the spring rate the car would really feel good. You should be very happy with the #350's for sure.
Figure with about 125 pounds of fuel against the #275 your ride height would vary almost a 1/2" from full to empty. Now should be less than about 3/16".
I'm glad you are happy with the setup.
MO
Thread Starter
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
2 updates.
1. I installed 400 # coils in the rear (up from 275's, then up to 350's & now 400's) and they balanced out the car nicely for my taste, no bottoming out, and a firm ride, which i did not want when I first intsalled them, but I like the firmer ride now.
2. Good news,,, the lower shock mount for the QA1 is an off the shelf part for a fraction of the cost of the other offerings, I installed this mount below for a grand total of $30 for the pair,,, but I did change the bolt to a grade 8 bolt with a hex head, but that was it, and I now have @ 1/2 Clearance between the trailing arm and the coil,, absolutly perfect!
http://www.speedwaymotors.com/Coil-O...port,3332.html
1. I installed 400 # coils in the rear (up from 275's, then up to 350's & now 400's) and they balanced out the car nicely for my taste, no bottoming out, and a firm ride, which i did not want when I first intsalled them, but I like the firmer ride now.
2. Good news,,, the lower shock mount for the QA1 is an off the shelf part for a fraction of the cost of the other offerings, I installed this mount below for a grand total of $30 for the pair,,, but I did change the bolt to a grade 8 bolt with a hex head, but that was it, and I now have @ 1/2 Clearance between the trailing arm and the coil,, absolutly perfect!
http://www.speedwaymotors.com/Coil-O...port,3332.html
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