 How To:converting rear shocks to adjust. coilovers, Boge shocks with stock dia springs |
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| Mueller |
 Jun 20 2005, 11:50 AM
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#1
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914 Freak!  Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None 
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I decided to add threaded collars to my Boge rear shocks so that I could adjust the ride height (rear too high)
Normally, one buys Koni Yellows or Bilstiens and simply just slides the threaded collar w/adjusting nut over the shock and uses 2.5" diameter springs. Due to budget constraints, I opted to keep my Welt. 140 springs (would work with stock springs) and my Boge shocks which seem to function just fine. First step is to take the springs off, then the perch...on the Boges, the perch is held onto the shock by means of 3 formed protrusions on the shock body, I was able to just hit the perch with shock upside down to remove the perch. I then cut the perch to fit both the adjusting nut and the inside of the collar. After the modifications, the perch is now 2 pieces instead of 1. In order to get the smaller ID perch over the 3 protrusions, I cut a slot in it to be able to spread it apart so that I could move it lower on the shock body, I also made 3 holes in it for rosette welds to the shock. The pictures should be pretty self explanatory of before, during and after. I can now easily adjust the ride height....total cost was about $60 including shipping for the collars and adjusting nut. Attached image(s) 
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Replies(20 - 39)
| Dave_Darling |
Jun 22 2005, 10:21 AM
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#21
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914 Idiot Group: Members Posts: 15,000 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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So, you gonna start doing these for other people? (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif)
--DD |
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| SteveSr |
Jun 22 2005, 10:56 AM
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#22
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Member Group: Members Posts: 203 Joined: 7-October 03 From: Knox,In. Member No.: 1,223 |
Mike,here's what I got from Ground Control for $199 Attached image(s) 
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| 914efi |
Jun 22 2005, 10:56 AM
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#23
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Member Group: Members Posts: 140 Joined: 14-June 04 From: Westport,MA Member No.: 2,204 Region Association: None |
I did a similar thing many years ago on my -6 with konis. I made my own adjusters so that I could use the stock welded band that was on the koni body, I just have a c'bore in my threaded collar at the correct height. I used perches from the old set of original housings.
I did pretty much the same for the front of my 944, except that I used the perch as it was cut off the existing strut. Just put the strut in a lathe and cut off the perch, it leaves behind the welded part of the perch to use for retaining the collar. Attached image(s) 
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| redshift |
Jun 22 2005, 10:56 AM
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#24
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Bless the Hell out of you! Group: Members Posts: 10,926 Joined: 29-June 03 Member No.: 869 |
(IMG:http://www.914world.com/bbs2/html/emoticons/hijacked.gif)
"Warning: This product contains a chemical known to the State of California to cause cancer and birth defects or other reproductive harm." Excuse me... what the hell is that all about? http://www.colemanracing.com/catalog/produ...43b5cd81eab4a90 M |
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| SteveSr |
Jun 22 2005, 11:01 AM
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#25
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Member Group: Members Posts: 203 Joined: 7-October 03 From: Knox,In. Member No.: 1,223 |
Sorry................... (IMG:http://www.914world.com/bbs2/html/emoticons/sad.gif) (IMG:http://www.914world.com/bbs2/html/emoticons/sad.gif) (IMG:http://www.914world.com/bbs2/html/emoticons/sad.gif)
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| Mueller |
Jun 22 2005, 11:54 AM
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#26
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914 Freak! Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None
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you like that warning don't you???? (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif) (IMG:http://www.914world.com/bbs2/html/emoticons/wacko.gif) I still couldn't find any chemicals on or with the parts I got from them (IMG:http://www.914world.com/bbs2/html/emoticons/unsure.gif) You should see the MSDS reports Enco sends when I buy tool bits or other chunks of metal...no liquids, just hard metal with tons of warnings...... |
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| Mueller |
Jun 22 2005, 01:16 PM
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#27
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914 Freak! Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None
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I could, but I don't see anyone willing to let me take a welder to thier shocks (IMG:http://www.914world.com/bbs2/html/emoticons/welder.gif) I'd be nervous doing this mod on nitrogen filled shocks unless I had a TIG welder (IMG:http://www.914world.com/bbs2/html/emoticons/blink.gif) |
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| Korijo |
Jun 23 2005, 11:36 AM
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#28
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[]D o [] o []V[] o []D Group: Members Posts: 1,308 Joined: 16-July 03 From: North Bend, WA Member No.: 914 |
the other night, i ordered the 2.08 kit for KONI reds. already have 10" springs
[not doing stock perch (IMG:http://www.914world.com/bbs2/html/emoticons/hijacked.gif) ] (IMG:http://www.914world.com/bbs2/html/emoticons/laugh.gif) |
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| Korijo |
Jun 25 2005, 01:48 PM
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#29
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[]D o [] o []V[] o []D Group: Members Posts: 1,308 Joined: 16-July 03 From: North Bend, WA Member No.: 914 |
soooo, i got the larger diameter [2.08] threaded collar. too tight right now (IMG:http://www.914world.com/bbs2/html/emoticons/ohmy.gif) . koni reds, painted black [need to loose the paint].
how, by you? mines close but no fit (IMG:http://www.914world.com/bbs2/html/emoticons/dry.gif) |
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| Dr. Roger |
Jun 25 2005, 01:59 PM
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#30
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A bat out of hell. Group: Members Posts: 3,944 Joined: 31-January 05 From: Hercules, California Member No.: 3,533 Region Association: Northern California |
Hey Mike,
Forgot to ask.... How did you cut/enlarge the perchs so cleanly? |
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| Mueller |
Jun 26 2005, 09:38 AM
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#31
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914 Freak! Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None
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Dave, the Koni Reds are larger in diameter (IMG:http://www.914world.com/bbs2/html/emoticons/sad.gif) Andrew took his down to a machine shop and they opened them up for I believe $25 (damn good price) Not sure what your time frame is, but I could open those up for you if you cannot find a local shop. I'd need to know the OD of the shock. Turn around time about 1.5 weeks at my pace (IMG:http://www.914world.com/bbs2/html/emoticons/smile.gif)
I have a decent sized metal working lathe.......... |
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| Korijo |
Jun 26 2005, 02:43 PM
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#32
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[]D o [] o []V[] o []D Group: Members Posts: 1,308 Joined: 16-July 03 From: North Bend, WA Member No.: 914 |
i measured 53mm, 2.086614". talk about "a gnatt's ass". (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif)
i'll send 'em to you, if you dont mind (IMG:http://www.914world.com/bbs2/html/emoticons/wink.gif) . i'm in no hurry. you need the adjustable perch? or just the collar? |
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| Mueller |
Jun 26 2005, 02:48 PM
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#33
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914 Freak! Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None
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just the threaded collar...what diameter springs are you running? 2.5" |
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| Korijo |
Jun 26 2005, 06:33 PM
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#34
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[]D o [] o []V[] o []D Group: Members Posts: 1,308 Joined: 16-July 03 From: North Bend, WA Member No.: 914 |
pretty sure they're 2.5's (IMG:http://www.914world.com/bbs2/html/emoticons/blink.gif)
got them from Joe O. 200lb 10" Hypercoil... same address? |
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| Mueller |
Jun 29 2005, 08:49 PM
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#35
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914 Freak! Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None
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Hey Dave,
I got your parts today, i should be able to put them on the lathe on Friday (IMG:http://www.914world.com/bbs2/html/emoticons/smash.gif) |
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| Mueller |
Jul 7 2005, 08:36 AM
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#36
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914 Freak! Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None
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Hey Dave,
Can you verify the dimension A on your shock?? If I read your PM correct, the OD should be 2.17" along the entire length until you hit "B"??? Thanks buddy (IMG:http://www.914world.com/bbs2/html/emoticons/cool_shades.gif) Attached image(s) 
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| Korijo |
Jul 7 2005, 12:05 PM
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#37
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[]D o [] o []V[] o []D Group: Members Posts: 1,308 Joined: 16-July 03 From: North Bend, WA Member No.: 914 |
yes, A = 2.17 "
i measured down by the shelf. on one end of the collar, there is a lip about 3/4" inside. the collar fit on the shock, but catches that lip. dig it? |
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| ArtechnikA |
Jul 7 2005, 03:39 PM
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#38
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rich herzog Group: Members Posts: 7,390 Joined: 4-April 03 From: Salted Roads, PA Member No.: 513 Region Association: None |
do the adjuster nuts have any kind of locking mechanism? 'cause otherwise i'd think you'd find them slowly unscrewing unless you used an additional nut as a jam nut...
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| Jeroen |
Jul 7 2005, 04:01 PM
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#39
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914 Guru Group: Members Posts: 7,887 Joined: 24-December 02 From: The Netherlands Member No.: 3 Region Association: Europe |
on the Ground Control units, the adjuster nut is actually a clamp that is tightened by an allen bolt |
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| Mueller |
Jul 7 2005, 06:02 PM
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#40
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914 Freak! Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None
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mine have a setscrew which presses a small piece of rubber against the threaded collar to eliminate twisting. |
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