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240racer · 08-21-2003, 05:50 PM

If you want you can use mass/damper frequencies to figure out what springs you should run. This: http://www.240sx.org/links/installs/...efinition.html

and the spring selection page (next one) will tell you everything you need to do. I have made up a spreadsheet on excell that has all the spring rates I can find and their equivilent ride frequency. Most of the aftermarket stuff is close to 2hz. The Tein HA's are 2.13f/2.02r and the pro-kits are about (cause they are progressive) 1.53f/1.40r. Having a little lower frequency in the rear helps with traction a little bit. If you are running an aftermarket bar in the back, then you are already probably having problems with rear wheel traction out of the corners. so if you raise the rear spring stiffness, that reduces the effectivness of the rear bar and gives you more traction. It's all a balance point, but for the 240, I would stick really close to 2hz for performance street and closer to 2.5hz for racing. Oh yeah, stock is 1.23f/1.28r All these were calculated useing 728lbs/corner on the front and 672lbs/corner on the rear.

email me at nord0306 at umn.edu if you want a copy of the spreadsheet

08-21-2003, 05:50 PM	#29
240racer Zilvia Junkie Join Date: Nov 2001 Location: Minneapolis, MN Age: 46 Posts: 574 Trader Rating: (0)	If you want you can use mass/damper frequencies to figure out what springs you should run. This: http://www.240sx.org/links/installs/...efinition.html and the spring selection page (next one) will tell you everything you need to do. I have made up a spreadsheet on excell that has all the spring rates I can find and their equivilent ride frequency. Most of the aftermarket stuff is close to 2hz. The Tein HA's are 2.13f/2.02r and the pro-kits are about (cause they are progressive) 1.53f/1.40r. Having a little lower frequency in the rear helps with traction a little bit. If you are running an aftermarket bar in the back, then you are already probably having problems with rear wheel traction out of the corners. so if you raise the rear spring stiffness, that reduces the effectivness of the rear bar and gives you more traction. It's all a balance point, but for the 240, I would stick really close to 2hz for performance street and closer to 2.5hz for racing. Oh yeah, stock is 1.23f/1.28r All these were calculated useing 728lbs/corner on the front and 672lbs/corner on the rear. email me at nord0306 at umn.edu if you want a copy of the spreadsheet __________________ Adam '89 coupe KA24DE+T 14.1 @ 104 MPH '88 Celica All-Trac turbo stock, but no more ecu codes!!