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Old 05-13-2020, 08:28 PM   #1
adamsbees
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Question what rear springs for 780?

Hello,
Hope you are all safe and healthy. I want to lower my volvo 780. I will be doing BCRacing coilovers in the front. For the back I do not want to pay $850 for Ben's coilovers so I will be buying a shock and spring. What spring will fit the rear without a spacer or other modification and provide a good drop?
Thanks in advance,
Adam

Last edited by adamsbees; 05-13-2020 at 11:26 PM..
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Old 05-14-2020, 10:23 AM   #2
kyote
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Have you been able to find a single person who is happy with their BC racing coilovers?
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Old 05-14-2020, 10:58 AM   #3
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Ask BC what their spring rate is in front so we can help with a rear rate.
While waiting indefinitely, search for stock car springs and stuff here. I think we just answered this question with lots of links recently.

OK, I did it for you.
https://forums.turbobricks.com/showp...8&postcount=13

and the 53mm sleeves that fit without sanding the whole tube:
https://www.ebay.com/itm/CNC-Machine...-/163023184638

You will probably end up with an 11" rear spring between 150# and 225#, a shorter shock, and a pair of cones to locate the end that is usually a pigtail. Or you can find a pigtail spring, or go full-caveman and make a pigtail on a standard spring with a torch and a lot of teeth-gnashing.
Remember to go at least 50% higher in front. If you READ, you will understand why.
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Old 05-14-2020, 11:00 AM   #4
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7/9 series shocks are a little longer than 240, so you can use something similar to what has been done on 240s.
7/9 series has a 12mm shock sleeve top and bottom, 240 has 1/2" on one end, 12mm on the other.
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Old 05-14-2020, 02:08 PM   #5
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Quote:
Originally Posted by kyote View Post
Have you been able to find a single person who is happy with their BC racing coilovers?
There is a reason besides the price why I have three pairs of BC front coilovers(2x240 1x960 FL).

Though looking from here the difference in price compared to Kaplhenke is pretty high.
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Old 05-14-2020, 02:37 PM   #6
classicswede
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Quote:
Originally Posted by mikep View Post
Ask BC what their spring rate is in front so we can help with a rear rate.
While waiting indefinitely, search for stock car springs and stuff here. I think we just answered this question with lots of links recently.

OK, I did it for you.
https://forums.turbobricks.com/showp...8&postcount=13

and the 53mm sleeves that fit without sanding the whole tube:
https://www.ebay.com/itm/CNC-Machine...-/163023184638

You will probably end up with an 11" rear spring between 150# and 225#, a shorter shock, and a pair of cones to locate the end that is usually a pigtail. Or you can find a pigtail spring, or go full-caveman and make a pigtail on a standard spring with a torch and a lot of teeth-gnashing.
Remember to go at least 50% higher in front. If you READ, you will understand why.

Is the 780 not IRS then?
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Old 05-14-2020, 02:41 PM   #7
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Is the 780 not IRS then?
Early 780s are live axle. 1986-87. By 1988 the have the 760 IRS in them.
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Old 05-14-2020, 04:49 PM   #8
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yep, like my 86 B230FK convert
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Old 05-14-2020, 05:44 PM   #9
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Quote:
Originally Posted by mikep View Post
Ask BC what their spring rate is in front so we can help with a rear rate.
If I remember correctly, their standard front spring for 200/700/900 is only 4kg/224lbs. No idea why so soft but it can be changed when ordering with no extra cost.
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Old 05-14-2020, 09:59 PM   #10
adamsbees
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Quote:
Originally Posted by mikep View Post
Ask BC what their spring rate is in front so we can help with a rear rate.
While waiting indefinitely, search for stock car springs and stuff here. I think we just answered this question with lots of links recently.

OK, I did it for you.
https://forums.turbobricks.com/showp...8&postcount=13

and the 53mm sleeves that fit without sanding the whole tube:
https://www.ebay.com/itm/CNC-Machine...-/163023184638

You will probably end up with an 11" rear spring between 150# and 225#, a shorter shock, and a pair of cones to locate the end that is usually a pigtail. Or you can find a pigtail spring, or go full-caveman and make a pigtail on a standard spring with a torch and a lot of teeth-gnashing.
Remember to go at least 50% higher in front. If you READ, you will understand why.
you da man
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Old 05-14-2020, 11:14 PM   #11
mikep
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I assumed solid rear axle, but we can navigate irs.
Lankku, thank you for the info.
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Old 05-14-2020, 11:53 PM   #12
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Quote:
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I assumed solid rear axle, but we can navigate irs.
Lankku, thank you for the info.
yes, I would not be wasting your time with solid axle stuff. The car is IRS mk1. That is my dilemma :(
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Old 05-15-2020, 04:39 AM   #13
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Matt Dupris posted ages ago that he'd put rear springs from a '91 Previa in his 1988 780, which eventually became my car.

According to his post, the rate for these things is about 230 lbs/in at the wheels.

I'm not sure if these were still fitted when I bought the car, but I found the springs in there at present feel a bit too soft for me. At least that was the impression I got from an interstate trip of about 1,200 miles, particularly at a cruising speed of about 60-70 MPH on the roads between Gundagai and Tamworth, which are like what you'd call county roads in the US.
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Old 05-15-2020, 07:50 AM   #14
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^I did this to my '89 780, they are not performance springs or shocks but work well with stock front springs. You just have to fabricate something for the top of the shock to bolt through. I made a bar for each side out of 1/4" plate, approx 3/4 wide and long enough to straddle the bolt holes for the nivomats, rounded off at the ends to fit inside the spring housing.
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Old 05-15-2020, 02:00 PM   #15
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I have IPDs anti-nivo bil HDs with some #300 springs from Speedway in the rear, I want to say 5x11?

http://www.swedishbricks.net/700900F...nversion1.html

Easy enough and a lot cheaper to make your own mounts. I have some really old anti-nivo Bil HDs I could ship you if you're interested though
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Old 05-17-2020, 05:37 PM   #16
adamsbees
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Question Lower spring mount

I will be making my own koni coilovers. I just dont know how to sort the lower shock mount. The piece of bent tubing with the two bolts that connects to the trailing arm? Can I reuse the ones from my nivos or?
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