Has anyone swapped SPASM springs with PASM springs?
02-27-2012, 10:55 PM
#1
3rd Gear
Thread Starter
Join Date: Feb 2012
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
Has anyone swapped SPASM springs with PASM springs?
I have Sports PASM and love the handling and LSD that this option provides - a must for track days. But for the street, where I live, it's harsh - esp. the much stiffer rear springs.
Has anyone swapped the SPASM springs for the PASM set? Does it require a software change for the PASM system? I would be interested in ability to do this with factory parts and costs. Thanks
Has anyone swapped the SPASM springs for the PASM set? Does it require a software change for the PASM system? I would be interested in ability to do this with factory parts and costs. Thanks
02-28-2012, 08:55 AM
#3
Race Director
I had both PASM and Sport PASM...Sport is a little stiffer and regular PASM but it's not night and day difference.
02-28-2012, 11:04 AM
#4
A good question and I'd like to know the answer too, but in the absence of a definitive response:
The difference isn't as big as you are imagining, but once the mind gets fixed on something, the perception is exaggerated. You can emulate a return to standard PASM by dropping tyre pressures by about 2 psi allround. Then reinflate for a spirited drive.
Or change to a softer tyre compound/sidewall all round. Michelins more compliant that Pirelli or Bridgestone.
The difference isn't as big as you are imagining, but once the mind gets fixed on something, the perception is exaggerated. You can emulate a return to standard PASM by dropping tyre pressures by about 2 psi allround. Then reinflate for a spirited drive.
Or change to a softer tyre compound/sidewall all round. Michelins more compliant that Pirelli or Bridgestone.
02-28-2012, 05:20 PM
#5
3rd Gear
Thread Starter
Join Date: Feb 2012
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
From an earlier post, the difference in rear spring rate is significant:
a recent thread titled H&R springs, somebody posted spring rates for 997.2 PASM vs SPASM, in newton meters (multiply by 5.7 for pounds):
Front C2S
PASM 33
SPASM 36
Rear C2S
PASM 56
SPASM 65/95 (progressive)
From 56lb to 95 is almost twice as stiff, while the pre-prgressive rate of 65 vs. 56 is 16% stiffer. In street driving on uneven surfaces, this should be a noticeable difference. I have a 2009 997.2 - doesn't sound like anyone has done the switch.
a recent thread titled H&R springs, somebody posted spring rates for 997.2 PASM vs SPASM, in newton meters (multiply by 5.7 for pounds):
Front C2S
PASM 33
SPASM 36
Rear C2S
PASM 56
SPASM 65/95 (progressive)
From 56lb to 95 is almost twice as stiff, while the pre-prgressive rate of 65 vs. 56 is 16% stiffer. In street driving on uneven surfaces, this should be a noticeable difference. I have a 2009 997.2 - doesn't sound like anyone has done the switch.
