Stock SR20DET springs
Seat Pressure 58.94-65.42kg @30.0mm
25.6kg @40.0mm
Free height 49.36mm
Color code GREEN
Manley 22165-16
http://www.manleyperformance.com/sc/mk/nissan/sr20_kits.shtml
Seat Pressure 90 @ 1.550″ (40.8kg @ 40mm)
Open Pressure 185 @ 1.170″ (84kg @ 30mm), 225 @ 1.010″ (102kg @ 25.65mm)
Stock/Max Lift 0.380″ (9.65 mm) 0.540″ (13.72 mm)
Coil Bind .960″ (24.38mm)
Rate (lbs./in.) 248
BC BC1200
https://briancrower.com/makes/nissan/sr20det_valvetrain.shtml
Seat: 1.550″ @ 90 lbs – 40mm 40.8kg
Open: 1.025″ @ 220 lbs – 26mm 99.8kg
Coil Bind: 0.910″ (23.11mm)
Cosworth 20000168
“Cosworth Performance Tuning Parts Catalogue 2011 – pdf”
Free height 46mm
Seat Pressure 365 N @ 39mm
Open Pressure 964 N @ 27.5mm
Max lift 11.5mm
Coil bind 25.4
Comp 909-16
https://www.compcams.com/valve-spring-chart
Seat Pressure 75 @ 1.550″
Open Pressure 170 @ 1.150″
Coil Bind Height (in.): 0.917″ (23.29mm)
Spring Rate: 240
Max lift .550″ (13.97mm)
TOMEI TYPE A 173004
https://www.tomei-p.co.jp/catalogue/sr_vs/
Set Length(mm) 40.0
Lift Length(mm) 27.5 (up to 12.5mm)
Compressed Length(mm) 26.5
Set Load(kgf) 25.6±7%
Lift Load(kgf) 81.6±7%
Supertech SPR-H1021S-16
https://www.supertechperformance.com/p61820-single-valve-springs
Seat Pressure: 68 @ 40.5 (30.8kg)
Open Pressure: 160 @ 10.0 (72.6kg)
Max Lift: 15.00mm
Coil Bind: 22.70mm
Rate in lbs./mm: 9,30
GSC GSC5051
https://www.power-division.com/gsc-power-division-sr20-det-beehive-spring-upgrade-with-titanium-retainer.html
IN: 103lbs @ 1.527″ / EX: 101lbs @ 1.533 install height
IN: 256lbs @ 1.055″ / EX: 254lbs @ 1.061″
Coil Bind (in) 0.920 (23.67mm)
Install Height (in) 1.527 / 1.533
Seat Pressure (lbs) 103 / 101
Open Pressure, 12.0mm Lift 256lbs @ 1.055″ / 254lbs @ 1.061″ 115kg
Maximum Valve Lift (in) 0.553″ 14mm
Kelford Cams KVS93
https://kelfordcams.com/product/kvs93
Seat pressure: 92lb at 39.90mm installed height (41.7kg)
Coil Bind: 23.25mm
Maximum lift: 39.90-23.25=16.65mm
Kelford Cams KVS93-BT
https://kelfordcams.com/product/kvs93-bt
Beehive springs, comes with titatium retainers
Seat pressure: 95lb (43kg) – using OEM spring base
Maximum lift: 15.00mm