Lower front spring perch for bilstein HD?
Addict
Rennlist Member
Rennlist Member
Joined: Dec 2001
Posts: 1,629
Likes: 47
From: Dundee, Scotland
Been around and around with this. This is where I am:
Option 1 - have new threads machined into the shock body below the current threaded area
Option 2 - have someone make up some lowering collars (you can buy collars that look like they are lowering collars, but they are just tall versions of what comes with the shock already, but designed to keep the spring in place when jacking up).
Option 3 - buy new - shorter -springs. I don't know where to start with this, most mass market stuff is described as -30mm or -40mm, not much diffference. Don't really want to change out the rear set up
Option 4 - cut existing springs. I'm afraid this is looking like a least worse option. Cheap, quick, keeps the same spring rate. Just seems a bit of a bodge on such a fine car...
Option 1 - have new threads machined into the shock body below the current threaded area
Option 2 - have someone make up some lowering collars (you can buy collars that look like they are lowering collars, but they are just tall versions of what comes with the shock already, but designed to keep the spring in place when jacking up).
Option 3 - buy new - shorter -springs. I don't know where to start with this, most mass market stuff is described as -30mm or -40mm, not much diffference. Don't really want to change out the rear set up
Option 4 - cut existing springs. I'm afraid this is looking like a least worse option. Cheap, quick, keeps the same spring rate. Just seems a bit of a bodge on such a fine car...
Three Wheelin'
Joined: Oct 2007
Posts: 1,468
Likes: 3
From: Chicago IL
You can always add some threads. Sourcing a new perch would be better but I couldn't find one so I took matters into my own hands 
M52 X 1.5. They are cut threads from factory so adding some more on shock body is fine.
M52 X 1.5. They are cut threads from factory so adding some more on shock body is fine.
Three Wheelin'
Joined: Feb 2003
Posts: 1,782
Likes: 110
From: Cambridge/Boston, MA
Progressive rate springs (H&R green and red) have extra dead coils on the top/bottom that essentially flatten when the weight of the car is on them. *I think* cutting into those coils won't alter the spring rate.
Any thoughts on this? I might be looking into this option too- front and rear.
Any thoughts on this? I might be looking into this option too- front and rear.
Instructor
Joined: Jun 2001
Posts: 107
Likes: 0
From: Laguna Niguel
Just got off the phone with Fvd Brombacher and they have the parts listed incorrectly as rear lowering collars when according to Rhonda (sales rep) there was confusion in translation from German to English. Part #115 110 015 listed for $76.27 but Rennlist price is $68.64ea.
http://www.fvd.de/us/en/Porsche-0/96...g_Springs.html
http://www.fvd.de/us/en/Porsche-0/96...g_Springs.html
Three Wheelin'
Joined: Feb 2003
Posts: 1,782
Likes: 110
From: Cambridge/Boston, MA
Woah great find! These will fit the front Bilstein HD struts? Did she say how much additional lowering they will provide? Looks like 1-2" from the photo.
I'll ring them in the morning to check.
I'll ring them in the morning to check.
Three Wheelin'
Joined: Feb 2003
Posts: 1,782
Likes: 110
From: Cambridge/Boston, MA
I love shops that take pride in their products. Talked to Rhonda at FVD/Florida, she contacted "Mr. Brombacher". These front collars lower an additional 1.5" and will fit the Bilstein 2" shock body thread (includes our HD's). Plenty in stock in Germany, and their shipments to Florida happen every Friday.
Ordering them up now!
Ordering them up now!
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Rennlist Member
Joined: May 2001
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From: Auckland, New Zealand.
I have RUF HD Bilsteins and what look like RUF springs. I had the ride height lowered as far as I could, but still not happy. The next step was to fit H&R Springs.
When the car was up on the lift I noticed that the front strut had no more thread left but the rear had more to go. Does lowering the front more with these perches allow the whole car to be lowered without affecting the handling? In other words will the springs still work properly?
When the car was up on the lift I noticed that the front strut had no more thread left but the rear had more to go. Does lowering the front more with these perches allow the whole car to be lowered without affecting the handling? In other words will the springs still work properly?
Nordschleife Master
Joined: Jul 2007
Posts: 5,613
Likes: 52
From: DFW, TX
Yea, the spring will still work properly, you just gotta consider how much compression travel the car has and how much spring rate the car has. If you're running really low and the springs don't have enough rate, you may find yourself running on the bumpstops when the road gets rough or when you really load up the suspension in corners.
Rennlist Member
Joined: May 2001
Posts: 13,507
Likes: 834
From: Auckland, New Zealand.
Yea, the spring will still work properly, you just gotta consider how much compression travel the car has and how much spring rate the car has. If you're running really low and the springs don't have enough rate, you may find yourself running on the bumpstops when the road gets rough or when you really load up the suspension in corners.
Three Wheelin'
Joined: May 2012
Posts: 1,349
Likes: 4
From: NYC
Oooh, those seem like a viable option. Sucks to say they won't work for me, I went through a pretty big dip a week ago and the tires left a bad rub mark on the passenger side fender lip. So I think if I lower a bit more it would not be wise unless I get slightly stiffer springs than these Eibachs. Other option is more camber.
Pro
Joined: Jan 2006
Posts: 602
Likes: 60
From: Texas
I have Koni FSD's on Eibach sport springs and had to do collars to RAISE the ride height. Otherwise I would have ended up with a bit lower than rs specs. I've got it at 145mm about 20mm lower than ROW. No bottoming and good handling. These cars handle great at RS specs , but they bottom at that height.
Addict
Rennlist Member
Rennlist Member
Joined: Dec 2001
Posts: 1,629
Likes: 47
From: Dundee, Scotland
Just got off the phone with Fvd Brombacher and they have the parts listed incorrectly as rear lowering collars when according to Rhonda (sales rep) there was confusion in translation from German to English. Part #115 110 015 listed for $76.27 but Rennlist price is $68.64ea.
http://www.fvd.de/us/en/Porsche-0/96...g_Springs.html
http://www.fvd.de/us/en/Porsche-0/96...g_Springs.html
Thanks..(Nick, we got there in the end)
