Springs - update for OE SS springs & sway bar changes
Posted: Sun Mar 29, 2015 10:16 pm
From several posts in New Caprice and SS Forum
2014 SS OE chassis springs
F - 92290030
R - 92290028
http://www.ssforums.com/forum/594489-post42.html" onclick="window.open(this.href);return false;
2015 SS OE spring
R - 92261935
http://www.ssforums.com/forum/602946-post60.html" onclick="window.open(this.href);return false;
The rear SS spring for 2014 is 60N/mm rate and the 2015 is 55N/mm.
Both front springs (2014 & 2015) are the same rate.
If the 2015 SS front spring PN is important, I'll find it, but the above statement (from an "inside" Detroit source) indicates the fronts are going to be almost identical - 2014 vs 2015.
What is interesting is the numbers you'll find in the spring data provided by Eibach (below) which compare their lowering springs to OE SS (I am assuming 2014) springs does appear to correlate fairly accurately as far as the OE rear springs (reported as 58 N/mm) vs the number I was provided (60 N/mm) in the above quote.
My decision is to use the 2015 rear springs, with slightly lower rate, because I intend to also use the 2015 SS rear sway bar. There's more to it than just adding the bar, but that's a subject for another thread.
http://eibach.com/m-america/en/eibach-n ... up-pro-kit" onclick="window.open(this.href);return false;
The other thing you have to look at is that comparing a PPV to an SS, the numbers Eibach publishes in their data is a comparison of OE & Eibach SS springs.
The better thing to do is measure the PPV and compare the SS & PPV wheel center to fender distances to get an idea of how much the OE SS springs "should" change the ride height. It would be helpful to do this on several PPV's to see if there is much variation, or to at least come up with an average. One thing to remember is the PPV does weigh a little more than the SS, so I would expect the same springs from an SS would result in slightly more reduction in ride height on PPV than what the SS measures.
I addressed the measurement process I used in an earlier post (July 23, 2013) - it does differ slightly from the method Eibach used.
viewtopic.php?f=18&t=84#p1688" onclick="window.open(this.href);return false;
I also posted this on SS Forum after I had a chance to measure an SS:
http://www.ssforums.com/forum/wheels-ti ... ement.html" onclick="window.open(this.href);return false;
The number I got for stock (front) springs was 15.46875" (based on wheel center vs wheel lip calculation), which compares quite closely with the 15.4" OE number in the Eibach data. The measurements were taken quickly, so my front & rear numbers may not be as accurate as they would have given more time or measuring method validation (all wheel positions & several vehicles).
2014 SS OE chassis springs
F - 92290030
R - 92290028
http://www.ssforums.com/forum/594489-post42.html" onclick="window.open(this.href);return false;
2015 SS OE spring
R - 92261935
http://www.ssforums.com/forum/602946-post60.html" onclick="window.open(this.href);return false;
The rear SS spring for 2014 is 60N/mm rate and the 2015 is 55N/mm.
Both front springs (2014 & 2015) are the same rate.
If the 2015 SS front spring PN is important, I'll find it, but the above statement (from an "inside" Detroit source) indicates the fronts are going to be almost identical - 2014 vs 2015.
What is interesting is the numbers you'll find in the spring data provided by Eibach (below) which compare their lowering springs to OE SS (I am assuming 2014) springs does appear to correlate fairly accurately as far as the OE rear springs (reported as 58 N/mm) vs the number I was provided (60 N/mm) in the above quote.
My decision is to use the 2015 rear springs, with slightly lower rate, because I intend to also use the 2015 SS rear sway bar. There's more to it than just adding the bar, but that's a subject for another thread.
http://eibach.com/m-america/en/eibach-n ... up-pro-kit" onclick="window.open(this.href);return false;
The other thing you have to look at is that comparing a PPV to an SS, the numbers Eibach publishes in their data is a comparison of OE & Eibach SS springs.
The better thing to do is measure the PPV and compare the SS & PPV wheel center to fender distances to get an idea of how much the OE SS springs "should" change the ride height. It would be helpful to do this on several PPV's to see if there is much variation, or to at least come up with an average. One thing to remember is the PPV does weigh a little more than the SS, so I would expect the same springs from an SS would result in slightly more reduction in ride height on PPV than what the SS measures.
I addressed the measurement process I used in an earlier post (July 23, 2013) - it does differ slightly from the method Eibach used.
viewtopic.php?f=18&t=84#p1688" onclick="window.open(this.href);return false;
I also posted this on SS Forum after I had a chance to measure an SS:
http://www.ssforums.com/forum/wheels-ti ... ement.html" onclick="window.open(this.href);return false;
The number I got for stock (front) springs was 15.46875" (based on wheel center vs wheel lip calculation), which compares quite closely with the 15.4" OE number in the Eibach data. The measurements were taken quickly, so my front & rear numbers may not be as accurate as they would have given more time or measuring method validation (all wheel positions & several vehicles).