Lowering springs, adequate amount but not excessively low...any suggestions?
thanks
If the shocks blow I will just go coil overs but as I understand it GMG sent the stock shocks out for testing to make sure their springs wont cause this - thus a major reason I went with their product.
soft setting is very compliant, easy to travel long distances with relative comfort. sport does not like bad roads as expected but its less harsh than stock springs and sport on so I would say its improved with the GMG springs.
soft setting is very compliant, easy to travel long distances with relative comfort. sport does not like bad roads as expected but its less harsh than stock springs and sport on so I would say its improved with the GMG springs.
If the shocks blow I will just go coil overs but as I understand it GMG sent the stock shocks out for testing to make sure their springs wont cause this - thus a major reason I went with their product.
soft setting is very compliant, easy to travel long distances with relative comfort. sport does not like bad roads as expected but its less harsh than stock springs and sport on so I would say its improved with the GMG springs.
soft setting is very compliant, easy to travel long distances with relative comfort. sport does not like bad roads as expected but its less harsh than stock springs and sport on so I would say its improved with the GMG springs.
Just saw this posted on the 996tt section, seems kind of odd. I wonder how it compares to the 997TT?
"I did so and the results were not good...I ve had the PSS10 shocks measured at all ten scales of bound/rebound as well as the stock shocks.
1)pSS9 had a linear adjustment...
pss10 does not have an accurate linear adjustment.At scale 1 (front)it has 105kg rebound.2 goes to 109 3 to 114 4 to 117 5 to 120 6 to 124 7 to 128 8 to 132 9 to 138 and 10 to 200...The stock one has 185...so in order to have a suspension with stock stiff you have to place it to 10!!!What is the reason for adjustability then?<!-- google_ad_section_end --> "<!-- / message --><!-- sig -->
"I did so and the results were not good...I ve had the PSS10 shocks measured at all ten scales of bound/rebound as well as the stock shocks.
1)pSS9 had a linear adjustment...
pss10 does not have an accurate linear adjustment.At scale 1 (front)it has 105kg rebound.2 goes to 109 3 to 114 4 to 117 5 to 120 6 to 124 7 to 128 8 to 132 9 to 138 and 10 to 200...The stock one has 185...so in order to have a suspension with stock stiff you have to place it to 10!!!What is the reason for adjustability then?<!-- google_ad_section_end --> "<!-- / message --><!-- sig -->
I dont know enough about suspension but surely you just cant take the shock rebound and generate some conclusions without considering the spring rates used on the setup too before saying one is going to be stiffer than the other???
Shock dyno and damping force adjustment: extremely complicated & more like black art than science! The more I read, the more it seems like voodoo to be practiced by the most seasoned of pro's.
Just some strictly beginner-amateur level thoughts -- any lurking pros please correct as needed:
1. Not clear if OP is talking about rebound or compression damping. While too much rebound damping could cause packing and harshness, if it is overall stiffness he's talking about, I think more relevant are issues of spring rate and compression damping.
2. I assume the comparisons are made at the same point of the dyno curve as far as shaft speed?
3. Last and most importantly, I don't think it's a good idea to separate the spring parameter from the shock absorber and make this kind of comparison.
The stock spring is progressive (initially soft), AND has a lower spring rate (soft). The Bilstein PSS10 not only is a stacked setup with linear main (the helper spring is fully compressed), but additionally it has a much higher spring rate. It's not unreasonable to speculate that for overall stiffness, the softer spring requires HIGHER compression damping force, and conversely, the stiffer Bilstein spring requires LESS.
In other words, conclusion should not be made simply because the damping force range of the Bistein seems to be small: With the stiff Bilstein spring, that 200 damping could in fact be A LOT STIFFER than the 185 of stock matched to the stock soft progressive spring. Assuming of course the OP is talking about compression force.
The more I read about the complicated black art of suspension tuning (you're talking about going through corners & little bumps & big bumps, and note the car's behavior, and THEN come back to tell your tuner, and correlate THAT to high speed and low speed compression and rebound damping settings), the more I believe that for most of us, the simplicity of the Damptronic version of Bitlstein is a blessing in disguise.
Just some strictly beginner-amateur level thoughts -- any lurking pros please correct as needed:1. Not clear if OP is talking about rebound or compression damping. While too much rebound damping could cause packing and harshness, if it is overall stiffness he's talking about, I think more relevant are issues of spring rate and compression damping.
2. I assume the comparisons are made at the same point of the dyno curve as far as shaft speed?
3. Last and most importantly, I don't think it's a good idea to separate the spring parameter from the shock absorber and make this kind of comparison.
The stock spring is progressive (initially soft), AND has a lower spring rate (soft). The Bilstein PSS10 not only is a stacked setup with linear main (the helper spring is fully compressed), but additionally it has a much higher spring rate. It's not unreasonable to speculate that for overall stiffness, the softer spring requires HIGHER compression damping force, and conversely, the stiffer Bilstein spring requires LESS.
In other words, conclusion should not be made simply because the damping force range of the Bistein seems to be small: With the stiff Bilstein spring, that 200 damping could in fact be A LOT STIFFER than the 185 of stock matched to the stock soft progressive spring. Assuming of course the OP is talking about compression force.
The more I read about the complicated black art of suspension tuning (you're talking about going through corners & little bumps & big bumps, and note the car's behavior, and THEN come back to tell your tuner, and correlate THAT to high speed and low speed compression and rebound damping settings), the more I believe that for most of us, the simplicity of the Damptronic version of Bitlstein is a blessing in disguise.
Just saw this posted on the 996tt section, seems kind of odd. I wonder how it compares to the 997TT?
"I did so and the results were not good...I ve had the PSS10 shocks measured at all ten scales of bound/rebound as well as the stock shocks.
1)pSS9 had a linear adjustment...
pss10 does not have an accurate linear adjustment.At scale 1 (front)it has 105kg rebound.2 goes to 109 3 to 114 4 to 117 5 to 120 6 to 124 7 to 128 8 to 132 9 to 138 and 10 to 200...The stock one has 185...so in order to have a suspension with stock stiff you have to place it to 10!!!What is the reason for adjustability then?<!-- google_ad_section_end --> "<!-- / message --><!-- sig -->
"I did so and the results were not good...I ve had the PSS10 shocks measured at all ten scales of bound/rebound as well as the stock shocks.
1)pSS9 had a linear adjustment...
pss10 does not have an accurate linear adjustment.At scale 1 (front)it has 105kg rebound.2 goes to 109 3 to 114 4 to 117 5 to 120 6 to 124 7 to 128 8 to 132 9 to 138 and 10 to 200...The stock one has 185...so in order to have a suspension with stock stiff you have to place it to 10!!!What is the reason for adjustability then?<!-- google_ad_section_end --> "<!-- / message --><!-- sig -->
Last edited by cannga; Dec 19, 2008 at 02:48 PM.



