First of all, I can't get a good enough description on what the two really are. All I know is that coaxial spring perches do not allow the spring and shock rod to compress unevenly. Fixed will cause inaccurate spring rates in the springs as the compression is not even? Is this correct?

If it is, why would Ground Control use fixed spring perches if they suck this bad?

I cannot find any more info on the two other than this and it concerns me a little as I use Ground Control Coilovers. Is autoxing my car going to ruin the springs due to the springs not compressing properly?

Any more info on all this would be awesome.


Modified by CAN97SH at 11:55 AM 3/25/2008

 

its not that bad, some one was blowing it completly out of proportion.

 

In theory, the coaxial spring perch, be it the upper or lower spring seat, allows the spring to compress "squarely", or along the same axis as the shock rod. It's a pivoting mount. Not having one isn't going to damage anything, and having a fixed spring perch does not suck that bad.

 

It's one of those little nitpicky things. Fixed perches are not going to ruin your springs. Every car that comes out of a Honda factory has fixed spring perches as stock.

Something like the Hyperco hydraulic perches are nice to have, but are not a necessity and are far from the first thing I would be looking to spend money on for improvement.

 

Thanks guys. I was not sure what the true definitions were of the two technologies and was a little concerned when I heard this and just wanted to know. I didn't really think Ground Control would make a truly inferior product when they have been doing so good but it brought up my curiosity.

It seems that the Coaxial perches are a specialized item as I've never seen one before. I saw a diagram of one and it looked like that perch swung back and forth to compensate for any harsh angles the suspension might be taking.

Who sells this type of stuff I wonder?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CAN97SH &raquo;</TD></TR><TR><TD CLASS="quote">Who sells this type of stuff I wonder?</TD></TR></TABLE>
http://www.hypercoils.com/Prod....aspx

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Targa250R &raquo;</TD></TR><TR><TD CLASS="quote">
http://www.hypercoils.com/Prod....aspx</TD></TR></TABLE>

Cool, thanks for the info

 

Ground Control, Moton, Penske, Ohlinis, JRZ, Dynamic, ect ect ect ALL have a fixed spring perch.


I think it *might* be a TINY bit more of an issue on some strut cars with shitty suspension geometry. And on those car the OEM has an upper perch which helps mitigate the issue.


Again there are about 100 more important issues on you car that you should worry about before you are worried about this.


Just as an example this would be like some one saying that rubber bushing are bad for you car because they cause binding.

What that is true, we are driving around mass produced economy **** boxes. Some binding rubber bushings is not an issue for us.

 

Bump from the dead but I couldn't find any other thread discussing co-axial spring perches.

Dennis Grant gives a good explanation on why one should expend the effort on making the spring co-axial on this page: http://farnorthracing.com/autocross_secrets5.html.

He then goes how on how to fabricate a set for a DSM on this page: http://farnorthracing.com/autocross/konis.html.

I was wondering if anyone has done anything similar with a 88-00 Honda or Acura. I would love to just buy something off the shelf but it seems that there is nothing available. Those Hyperco hydraulic spring perches are not an option as they require a rebuild every 10-12 hours of usage.

 

I agree that it's not necessary, especially on a street car. Unless your car is track-only, I wouldn't worry about it.

Besides, with Civic/Integra suspension geometry (location of the upper and lower shock mounts, angle of shocks relative to vertical, etc.), the angular movement really isn't that much as the suspension moves throughout its normal range of motion.

If some of the biggest names in racing suspension uses fixed mounts, I think it will be fine.