NC Spring Perch Installation

Installations instructions for MonsterFlow intakes, Big Brake Kits, shocks and more.

Re: NC Spring Perch Installation

Postby Auto-x-er » Tue Jun 04, 2013 3:06 pm

I am using 2.5" springs with the Fatcat. I have not seen Brian's car, I am far away.

So is this what you are talking about then? http://www.good-win-racing.com/Mazda-Pe ... -0199.html

Getting expensive in parts to make this work.
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Re: NC Spring Perch Installation

Postby skeeler » Tue Jun 04, 2013 3:57 pm

Sorry; I got you confused with someone in Portland.

I think Goodwin's spring reducer is 2.5-2.25 inches; even though he doesn't say so in the description, he mentioned it in one of the forum threads. If your main and helper springs are both 65 mm, then you need something like this or the similar parts made by Hyperco or Eibach:

http://www.frsport.com/Swift-Stacked-Sp ... 4AodVWAA9Q

I don't think Goodwin sells a part like that.
2009, STR & DD. 1995, HPDE. 2004 MSM, sold. 2010 Mazda3, hers.
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Re: NC Spring Perch Installation

Postby skeeler » Sun Feb 23, 2014 5:15 pm

Brian,

As I mentioned, I've been using your upper spring perch adapters to run 70-mm straight springs in the rear of my NC. The 70-mm springs give me extra clearance to prevent rubbing the damper. In order to fit the 70-mm springs, I epoxied some carefully chosen hubcentric rings to the OD of the spring seat. Unfortunately, I still get a little rubbing between your adaptor and the damper.

So, would you be willing to offer a set of your adapters designed specifically for 70-mm springs, in other words machined with an OD of ~69.5 mm and and ID that's ~5 mm more than your current model?
2009, STR & DD. 1995, HPDE. 2004 MSM, sold. 2010 Mazda3, hers.
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Re: NC Spring Perch Installation

Postby Brian » Mon Feb 24, 2014 7:18 am

Did you space out the bottom connection per the directions in the production description? Properly installed there is no contact between spring and shock, no rub.
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Re: NC Spring Perch Installation

Postby skeeler » Mon Feb 24, 2014 9:32 am

Brian,

I didn't space out lower damper mount, since I didn't want to compromise the suspension geometry or the support of the lower damper by the upright.
2009, STR & DD. 1995, HPDE. 2004 MSM, sold. 2010 Mazda3, hers.
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Re: NC Spring Perch Installation

Postby Brian » Mon Feb 24, 2014 9:49 am

You are leaping to the assumption that the original arc geometry of the rear was in anyway ideal. To put it another way, you are also assuming that making that rear shock action more linear is somehow a bad thing. I humbly suggest there is no evidence to support those assumptions (the fact I am consistently TOP TIME OF DAY at event after event suggests we might even have improved that geometry, or at the very least not 'compromised' it).
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Re: NC Spring Perch Installation

Postby skeeler » Mon Feb 24, 2014 10:31 am

Brian, you make a good point. Are you concerned about the bottom of the damper not being supported by the post on the upright? I guess it's never been a problem for you.
2009, STR & DD. 1995, HPDE. 2004 MSM, sold. 2010 Mazda3, hers.
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Re: NC Spring Perch Installation

Postby Brian » Mon Feb 24, 2014 10:35 am

Indeed never been an issue and I can't imagine many customers putting more stress on it than we do....with 18x10.5 wheels, 285/30/18 hoosiers and about 300 hp.

But if concerned on that point have a machine shop make you a little sleeve for better fit/support.
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