gtohmy
07-29-2009, 11:22 PM
This started out as a King Spring tech thread only, but I thought I would expand this to try and include most of the springs available out there that fit within the stock system. If you find any information you think it inaccurate please just PM me and I’ll check into it. I would like the thread to serve as a reference in one place.
Some general info that applies to all companies-
Most spring companies deal in MM, not inches when talking about their springs and how much they raise/drop vs. a stock GTO suspension. So that’s the basis of a lot of the numbers below. As such these manufactures really don't have any direct comparison to standard ½ inch, ¾ inch, 1 ¼ inch, raise/drop that are often used. Any reseller that is advertising any manufactures model spring in standard rate (i.e.: spring XYZ is 1/2 inch drop, spring XYW 1 inch drop, etc. is most likely rounding up or down in height to get the standard number. I would suggest if your getting springs from a manufacture who offers different drops/rise amounts you get exact part numbers so you can understand the exact drops/rise amounts.
Some basic match conversion information-
1mm=.03912inch
5mm=.1956 inch (about 13/64-closest to 1/4)
10mm=.3912 inch (about 25/64- closet to 1/2)
20mm=.7824 inch (about 25/32-closest to 3/4)
25mm=.978 inch (closest to 1 inch)
30mm=1.173 inch (about 1 11/64)
35mm=1.3962 inch
50mm=1.956 inch
¼ inch=.25 inch
½ inch=.50 inch
¾ inch=.75 inch
Stock GTO “claimed” spring rates found on internet sites-This rate and all other rates I am stating in this thread are lb/in rates.
Front 175 linear/Rear 320-420 progressive
What the stock springs actually measured at on a super low mileage set. Low enough mileage to be very close to accurate IMO-
Front 140 linear /Rear 245 linear
Lovells US Rep stated the following about stock spring rates-
Fronts 150 linear/Rears 300 linear
GTO have a real problem with the rear stock springs often sagging. That means they end up being lower then they would stock. Keep this in mind so that if you get a "stock height" spring for the rear and it appears to have "raise" the rear height, it is in fact just returning it to the level it would be with a set of new stock springs. Any “raise” you get would be from the sag that existed in the stock spring your removing.
KING SPRINGS-
In this part I am listing the information I got from king springs directly. This information was given from one of their lead technical people and I believe it to be accurate.
I have been told any of these springs will work even though they aren't specifically listed for the year/model. They are all applicable to the "commodore" platform. I don't know the specifics on the "height" figures that are listed i.e.: what exactly they are measuring to get the "height" figures they use. What I do know is the part numbers that they told me are the stock FE2 height springs, which would be the stock "height" for the 04-06 year GTO. So if you look at those height numbers that go with those model numbers, which are expressed in mm, you can then get an idea of what each spring will drop or raise relative to that number. Finally of course the majority of springs are progressive in rate.
KHFS-22 listed as stock FE2 front spring height-195mm
KHRL-125 listed as stock FE2 rear spring height-160mm
So if you wanted to drop yourself 3/4 of an inch you would look at something 20mm less. So for front springs you would like at something that was 175mm. For the rear you would look at something that was 140mm. And on and on.
FRONT-
PART NUMBER RATE(lbs/in)/HEIGHT (mm)
KHFL-22SSL 200-250/135
KHPR-22SL 200-250/145
KHFL-47SSL 220-300/145
KHFL-47SLRP 180-230/145
KHPR-22 200-250/155
KHFL-47SL 180-230/155
KHPR-19 200-250/165
KHFL-22HHD 300-500/165
KHFL-22 180-230/165
KHFL-19 180-230/175
KHFL-47HHD 350-500/175
KHFL-47HD 200-250/175
KHFL-47 180-230/175
KHFL-48HD 200-250/185
KHFL-48 180-230/185
KHFS-22 180-230/195
KHFS-19 140-210/205
KHFS-48 120-240/215
KHFR-19 240 linear/235
KHFR-19H 240 linear/ 250
KHFR-64 200 linear/300
REAR-
PART NUMBER RATE (lbs/in)/HEIGHT (mm)
KHRL-46SSSL 360-440/110
KHRL-46SSL 360-440/120
KHRL-46SL 360-440/130
KHRL-46SLHD 440-520/130
KHRL-127SSL 360-440/140
KHRL-46 360-440/140
KHRL-46HHD 600-1000/140
KHRL-46HD 440-520/145
KCOMU-03 550-600/145
KHRL-127SL 360-440/150
KHRL-45 360-440/150
KHRL-45HHD 600-1000/150
KHRL-45HD 440-520/155
KHRL-125 360-440/160
KHRL-127 360-440/160
KHRL-125HD 440-520/165
KHRL-69 340-450/170
KHRS-46 340-450/170
KHRL-69HD 440-520/175
KHRS-125 340-450/180
KHRS-45 340-450/180
KHRR-125 340-450/190
KHRS-69 380-450/200
KHRR-69 380-450/210
KHRR-65 390-470/240
LOVELL SPRINGS-
They are using a linear spring in the front and the rear. This information was gathered from Lovell’s main US dealer.
FRONT-
HEIGHT/RATE
360mm listed as “stock height”-165lb
340mm would be a 20mm drop-165lb
REAR-
HEIGHT/RATE
370mm Listed as “stock us height”- 400lb
350mm this would be a 20mm drop-400lb
320mm this would be a 50mm drop-360lb
PEDDERS SPRINGS-
This information is based on available charts on other boards and on Pedders retailer’s sites. Pedders doesn’t release actual spring rates. Instead they use percentage increase of rate at full compression. If you want to try and estimate the spring rate, then use the “claimed” stock spring rates in the top of this thread as the base figure. I was told by a dealer/rep for Pedders on another board they use “claimed” stock spring rates as their base rates. I have no idea if Pedders uses liner or progressive springs, but you can make an educated guess that if they are following the stock “claimed” rates they would use a linear for the front and progressive for the rear. They also have some models that raise from stock height that I have not listed.
FRONT-
PART NUMBER HEIGHT/RATE
2142 5mm drop/+50%
2151 20mm drop/+45%
5601 25mm drop/+55%
2275 35mm drop/+47%
REAR-
PART NUMBER HEIGHT/RATE
7643 0mm drop/+50%
2643 20mm drop/+47%
6419 25mm drop/+55%
2641 35mm drop/+47%
EIBACH SPRINGS-
Model# ProKit 3897.140
1.0 inch drop FRONT/.8 inch drop REAR
Known info- There are measured rates available. I have a request in with the manufacture to see if they will give stated rates.
H&R SPRINGS-
Model#50757
1.4 inch drop FRONT/1.2 inch drop REAR
Known Info- Stated to “increase spring rate 20-25% over stock” on retailers site. I have no idea if they are using “claimed” rate or not as a base. I have a request in with the manufacture to see if they will give stated rates.
TEIN SPRINGS-
Model#SKJ06-AUB00
26mm drop (1.0inch) FRONT/24mm (.9inch) drop REAR
Known Info- Rates as stated on the main Tein US site as 168lbs FRONT/368lbs/in REAR
B&G SPRINGS-
Model#12.1.015
1.2 inch drop FRONT/1.0 inch drop REAR
Known info- Stated as progressive spring rate in there advertising. I have a request in with the manufacture to see if they will give stated rates.
Some general info that applies to all companies-
Most spring companies deal in MM, not inches when talking about their springs and how much they raise/drop vs. a stock GTO suspension. So that’s the basis of a lot of the numbers below. As such these manufactures really don't have any direct comparison to standard ½ inch, ¾ inch, 1 ¼ inch, raise/drop that are often used. Any reseller that is advertising any manufactures model spring in standard rate (i.e.: spring XYZ is 1/2 inch drop, spring XYW 1 inch drop, etc. is most likely rounding up or down in height to get the standard number. I would suggest if your getting springs from a manufacture who offers different drops/rise amounts you get exact part numbers so you can understand the exact drops/rise amounts.
Some basic match conversion information-
1mm=.03912inch
5mm=.1956 inch (about 13/64-closest to 1/4)
10mm=.3912 inch (about 25/64- closet to 1/2)
20mm=.7824 inch (about 25/32-closest to 3/4)
25mm=.978 inch (closest to 1 inch)
30mm=1.173 inch (about 1 11/64)
35mm=1.3962 inch
50mm=1.956 inch
¼ inch=.25 inch
½ inch=.50 inch
¾ inch=.75 inch
Stock GTO “claimed” spring rates found on internet sites-This rate and all other rates I am stating in this thread are lb/in rates.
Front 175 linear/Rear 320-420 progressive
What the stock springs actually measured at on a super low mileage set. Low enough mileage to be very close to accurate IMO-
Front 140 linear /Rear 245 linear
Lovells US Rep stated the following about stock spring rates-
Fronts 150 linear/Rears 300 linear
GTO have a real problem with the rear stock springs often sagging. That means they end up being lower then they would stock. Keep this in mind so that if you get a "stock height" spring for the rear and it appears to have "raise" the rear height, it is in fact just returning it to the level it would be with a set of new stock springs. Any “raise” you get would be from the sag that existed in the stock spring your removing.
KING SPRINGS-
In this part I am listing the information I got from king springs directly. This information was given from one of their lead technical people and I believe it to be accurate.
I have been told any of these springs will work even though they aren't specifically listed for the year/model. They are all applicable to the "commodore" platform. I don't know the specifics on the "height" figures that are listed i.e.: what exactly they are measuring to get the "height" figures they use. What I do know is the part numbers that they told me are the stock FE2 height springs, which would be the stock "height" for the 04-06 year GTO. So if you look at those height numbers that go with those model numbers, which are expressed in mm, you can then get an idea of what each spring will drop or raise relative to that number. Finally of course the majority of springs are progressive in rate.
KHFS-22 listed as stock FE2 front spring height-195mm
KHRL-125 listed as stock FE2 rear spring height-160mm
So if you wanted to drop yourself 3/4 of an inch you would look at something 20mm less. So for front springs you would like at something that was 175mm. For the rear you would look at something that was 140mm. And on and on.
FRONT-
PART NUMBER RATE(lbs/in)/HEIGHT (mm)
KHFL-22SSL 200-250/135
KHPR-22SL 200-250/145
KHFL-47SSL 220-300/145
KHFL-47SLRP 180-230/145
KHPR-22 200-250/155
KHFL-47SL 180-230/155
KHPR-19 200-250/165
KHFL-22HHD 300-500/165
KHFL-22 180-230/165
KHFL-19 180-230/175
KHFL-47HHD 350-500/175
KHFL-47HD 200-250/175
KHFL-47 180-230/175
KHFL-48HD 200-250/185
KHFL-48 180-230/185
KHFS-22 180-230/195
KHFS-19 140-210/205
KHFS-48 120-240/215
KHFR-19 240 linear/235
KHFR-19H 240 linear/ 250
KHFR-64 200 linear/300
REAR-
PART NUMBER RATE (lbs/in)/HEIGHT (mm)
KHRL-46SSSL 360-440/110
KHRL-46SSL 360-440/120
KHRL-46SL 360-440/130
KHRL-46SLHD 440-520/130
KHRL-127SSL 360-440/140
KHRL-46 360-440/140
KHRL-46HHD 600-1000/140
KHRL-46HD 440-520/145
KCOMU-03 550-600/145
KHRL-127SL 360-440/150
KHRL-45 360-440/150
KHRL-45HHD 600-1000/150
KHRL-45HD 440-520/155
KHRL-125 360-440/160
KHRL-127 360-440/160
KHRL-125HD 440-520/165
KHRL-69 340-450/170
KHRS-46 340-450/170
KHRL-69HD 440-520/175
KHRS-125 340-450/180
KHRS-45 340-450/180
KHRR-125 340-450/190
KHRS-69 380-450/200
KHRR-69 380-450/210
KHRR-65 390-470/240
LOVELL SPRINGS-
They are using a linear spring in the front and the rear. This information was gathered from Lovell’s main US dealer.
FRONT-
HEIGHT/RATE
360mm listed as “stock height”-165lb
340mm would be a 20mm drop-165lb
REAR-
HEIGHT/RATE
370mm Listed as “stock us height”- 400lb
350mm this would be a 20mm drop-400lb
320mm this would be a 50mm drop-360lb
PEDDERS SPRINGS-
This information is based on available charts on other boards and on Pedders retailer’s sites. Pedders doesn’t release actual spring rates. Instead they use percentage increase of rate at full compression. If you want to try and estimate the spring rate, then use the “claimed” stock spring rates in the top of this thread as the base figure. I was told by a dealer/rep for Pedders on another board they use “claimed” stock spring rates as their base rates. I have no idea if Pedders uses liner or progressive springs, but you can make an educated guess that if they are following the stock “claimed” rates they would use a linear for the front and progressive for the rear. They also have some models that raise from stock height that I have not listed.
FRONT-
PART NUMBER HEIGHT/RATE
2142 5mm drop/+50%
2151 20mm drop/+45%
5601 25mm drop/+55%
2275 35mm drop/+47%
REAR-
PART NUMBER HEIGHT/RATE
7643 0mm drop/+50%
2643 20mm drop/+47%
6419 25mm drop/+55%
2641 35mm drop/+47%
EIBACH SPRINGS-
Model# ProKit 3897.140
1.0 inch drop FRONT/.8 inch drop REAR
Known info- There are measured rates available. I have a request in with the manufacture to see if they will give stated rates.
H&R SPRINGS-
Model#50757
1.4 inch drop FRONT/1.2 inch drop REAR
Known Info- Stated to “increase spring rate 20-25% over stock” on retailers site. I have no idea if they are using “claimed” rate or not as a base. I have a request in with the manufacture to see if they will give stated rates.
TEIN SPRINGS-
Model#SKJ06-AUB00
26mm drop (1.0inch) FRONT/24mm (.9inch) drop REAR
Known Info- Rates as stated on the main Tein US site as 168lbs FRONT/368lbs/in REAR
B&G SPRINGS-
Model#12.1.015
1.2 inch drop FRONT/1.0 inch drop REAR
Known info- Stated as progressive spring rate in there advertising. I have a request in with the manufacture to see if they will give stated rates.