09 Shocks... Side by side comparison to 04-08
#1
09 Shocks... Side by side comparison to 04-08
So i had a chance to take the stock shocks off last night in order to compare them to the yellows that i have been waiting to install. In comparison to the yellows and to a set of oe 04 shocks, there is only one slight difference in the shocks and that is that the perch height is about a 1/4" higher on the 09 shocks than it is on the previous models. I have the stock ones out and am gonna have a spacer made for the spring. I was originally gonna have the shocks sent to koni, however the difference is so small that im just gonna get a spacer. All other dimensions including shaft length and body length are identical. I should be able to get pictures later tonight of the two shocks side by side.
Sacha
Sacha
#2
05-08 SCCA BS Natl Champ
iTrader: (1)
So i had a chance to take the stock shocks off last night in order to compare them to the yellows that i have been waiting to install. In comparison to the yellows and to a set of oe 04 shocks, there is only one slight difference in the shocks and that is that the perch height is about a 1/4" higher on the 09 shocks than it is on the previous models. I have the stock ones out and am gonna have a spacer made for the spring. I was originally gonna have the shocks sent to koni, however the difference is so small that im just gonna get a spacer. All other dimensions including shaft length and body length are identical. I should be able to get pictures later tonight of the two shocks side by side.
Sacha
Sacha
#11
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a) it better be the perfect thickness, too much or too little is a DSQ violation
b) adding it to a helical perch isn't as easy as you think
c) the helical angle and spring contact surface length also have to be a dead match to OE
the Miata application mentioned had a loose perch and the shock body had grooves that a c-clip fit into to locate the perch, so adding a flat shim of proper thickness was easy in comparison to what's being proposed here ...
b) adding it to a helical perch isn't as easy as you think
c) the helical angle and spring contact surface length also have to be a dead match to OE
the Miata application mentioned had a loose perch and the shock body had grooves that a c-clip fit into to locate the perch, so adding a flat shim of proper thickness was easy in comparison to what's being proposed here ...
#15
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FWIW, Truechoice Koni Racing Service had a better lead-time than Koni NA a couple months ago.
Last edited by iaus10; 05-15-2009 at 07:17 AM. Reason: clarification
#16
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It doesn't cost that much more to get DA vs external rebound only, they still have to disassemble the shock in entirety and replace all the seals etc.
my recommendation is to have the perch relocated, it's actually very easy to do it yourself on a twin tube shock if you have the metal working skills/tools, the tricky part is locating it properly
my recommendation is to have the perch relocated, it's actually very easy to do it yourself on a twin tube shock if you have the metal working skills/tools, the tricky part is locating it properly
#22
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Call Phil Harris @ Truechoice Koni Racing Services 1-888-566-4722
http://www.truechoicekoniracingservices.com/
.
http://www.truechoicekoniracingservices.com/
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#23
a) it better be the perfect thickness, too much or too little is a DSQ violation
b) adding it to a helical perch isn't as easy as you think
c) the helical angle and spring contact surface length also have to be a dead match to OE
the Miata application mentioned had a loose perch and the shock body had grooves that a c-clip fit into to locate the perch, so adding a flat shim of proper thickness was easy in comparison to what's being proposed here ...
b) adding it to a helical perch isn't as easy as you think
c) the helical angle and spring contact surface length also have to be a dead match to OE
the Miata application mentioned had a loose perch and the shock body had grooves that a c-clip fit into to locate the perch, so adding a flat shim of proper thickness was easy in comparison to what's being proposed here ...
![](http://farm4.static.flickr.com/3353/3592177348_2f4c2e8af6_o.jpg)
So the question is: If the low point and high point of the perch is identical to OEM are we OK. This is true for the Koni’s used but the rate of rise in the perch between these 2 points differs on the Koni vs OEM. Where in the rule book is the requirement for perch dead match?
#24
Mine are out at koni as we speak. More than likely i will have them converted to double/external since they have to be taken apart anyways. i will have an answer hopefully today. They have already sent the info and measurements they gathered from my stock 09 rears to holland to start producing an 09 specific rear fitment