Toyota MR2 Message Board - View Single Post

abarks · 10-04-2009, 01:15 PM

G-Authority -

Thanks for the info. I used the formula on the Eaton Springs website to create a spring rate calculator spreadsheet. I pulled the stock springs, measured them, added the values into my spreadsheet.

Bottom line: 3/8 of a coil results in 9.5% rate increase. 1/2 coil is 13% increase. The value is essentially identical for front and rear springs.

My plan at the moment is to remove 3/8 of a coil from each for starters. There is clearly a point at which cutting springs will take away too much suspension travel for the resulting spring rate increase. I'm sure that's were folks start to get into trouble. At some point, a spring would simply have to increase the diameter of the wire in order to increase the rate while retaining the necessary travel.

In my case, I'm only running the car on a race track, so I shouldn't need all of the suspension travel. Second, I'm removing weight, so I need to lower the car back down.

That's my plan. I'll post the results when I put the car back together.

10-04-2009, 01:15 PM	#9 (permalink)
abarks No Skills Join Date: Sep 2009 Location: Raleigh, NC Posts: 9 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	G-Authority - Thanks for the info. I used the formula on the Eaton Springs website to create a spring rate calculator spreadsheet. I pulled the stock springs, measured them, added the values into my spreadsheet. Bottom line: 3/8 of a coil results in 9.5% rate increase. 1/2 coil is 13% increase. The value is essentially identical for front and rear springs. My plan at the moment is to remove 3/8 of a coil from each for starters. There is clearly a point at which cutting springs will take away too much suspension travel for the resulting spring rate increase. I'm sure that's were folks start to get into trouble. At some point, a spring would simply have to increase the diameter of the wire in order to increase the rate while retaining the necessary travel. In my case, I'm only running the car on a race track, so I shouldn't need all of the suspension travel. Second, I'm removing weight, so I need to lower the car back down. That's my plan. I'll post the results when I put the car back together.