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| My DIY rear Coil-over conversion (84 model)... play by play (Warning many pics) (Page 10/11) |
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zkhennings
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JUL 23, 01:43 PM
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Awesome, I have no dust boots on my coilover conversion as they did not fit, and it would be nice to add some. Thanks for doing the leg work.
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redraif
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JUL 23, 02:08 PM
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Awesome! Thanks for doing the research on the dust boots and adding the info in! Now once I get the brake sorted I can add the dust boots to my conversion as well.
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fieroguru
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JUL 23, 07:35 PM
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Here is a super simple way of centering the springs.
Not shown in the picture, but apply PVC cement between the two pieces of PVC pipe. This will lock them in place around the strut hat plate.
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Spadesluck
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JUL 24, 11:18 AM
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Paul, that is a very ingenious way of keeping the spring centered! What size piping is that?
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fieroguru
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JUL 24, 01:09 PM
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pmbrunelle
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DEC 13, 07:52 PM
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For a different Fiero now (mine), I have cut off the spring perch, while leaving the weld bead on the KYB strut.
What threaded sleeve is recommended in this case?
I could still use the Allstar ALL64143 sleeves, but cut them down shorter. However, I don't really like the setscrew on the Allstar adjusting nut since it damages the threaded sleeve.[This message has been edited by pmbrunelle (edited 12-13-2021).]
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pmbrunelle
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JAN 29, 10:34 PM
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pmbrunelle
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JAN 29, 10:49 PM
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Note that "high-travel" springs are not all created equal.
In the 10 in free length, 250 lb/in category, here are some examples:
Eibach 1000.250.0250 6.28" travel https://eibach.com/us/i-572...coilover-spring.html
Strange Hyperco SP10250 6.786" travel https://www.strangeengineer...-10-250-lbs-pr.html/
QA1 and others travel not specified
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With my old setup, I did have an issue where the spring coils would slightly rub and wear the threaded sleeve:
Sometimes the rubbing could be audible.
I am considering a barrel-shaped spring to solve this rubbing issue:
Thoughts?
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fieroguru
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JAN 30, 09:19 AM
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I don't see the spring rubbing issue on my kits but us the 4 3/4" tall sleeves for all applications, so there is much more clearance once the sleeve ends. Part of the issue is the top spring perch is the bottom of the strut tower and it does not remain parallel to the bottom spring perch through the suspension range of motion. On the applications where I flip the strut hat, I install these upper spring perches that remain perpendicular to the strut shaft at all times.
I have used the barrel type springs a few times and they work fine. It was primarily to get the color the customer wanted. I use QA1 high travel for all springs for the application where the customer wants black or grey springs, eibach when they want red, and have a few other options for different colors. The 10" high travel with any of these suppliers will not coil bind. A normal 10" 275 lb/in QA1 spring will. The high travel springs are also lighter which is an added bonus.
Most Level 4 assembled coilovers with 250 lb/in x 12" springs weigh 32 lbs for the pair. Some of the higher springs rates have bumped the weight up to 36 lbs. It has been a while since I did a 10" spring setup, but I think it was in the 30 to 31 lb range.
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pmbrunelle
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JAN 30, 04:13 PM
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On my car, I am predicting 5.94" of spring deflection when the bumpstop will make initial contact, so coil bind seems like something to watch out for.
I have ordered a pair of Hyperco springs.
Besides having a short coil bind height, they also have a very slight barrel shape, which I think will reduce the chances of rubbing:
In Hyperco marketing-speak, they call the barrel shape OBD (Optimum Body Diameter).
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