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Discussion Starter #1 (Edited)
Here are some springs I did research on and also contacted several companies to get information on the drop and spring ratings... Please add any other lowering springs spec/information thats not listed, and I will add it on the list :thumb:



Company //// Ride Height F/R //// Spring Rate F/R :: (L) Linear (P) Progressive


  • Stock '06 Si Coupe //// 0" / 0" //// (L) 200 lbs. / 230 lbs.

  • Eibach ProKit//// 1.0" / 1.2” //// Coupe (P) 137-222 in. lbs / 143-262 in. lbs
  • Eibach ProKit//// 1.2" / 1.0” //// Sedan (P) 137-222 in. lbs / 142-262 in. lbs


  • Eibach Sportlines //// 1.4" / 1.4” //// (P) 125-222 in. lbs / 131-262 in. lbs


  • Skunk 2 //// 1.5” / 1.4” //// (P) 135-184 in. lbs / 125-273 in. lbs


  • Tein H-Tech //// 0.79” / 0.67” //// (P) 220 in. lbs / 250 in. lbs


  • Tein S-Tech //// 1.54” / 1.42” //// (P) 230 in. lbs / 270 in. lbs


  • Tanabe Sustec GF210 //// 1.0” / 0.75” //// (L) 187 in. lbs / 225 in. lbs ; +20-30% est.


  • Progress Group //// 1.3” / 1.2” //// (L) 240 in. lbs / 330 in. lbs


  • Neuspeed Sport //// 1.6” / 1.6” //// (P)+-218 in. lbs / +-448 in. lbs


  • Neuspeed Race//// 2.0” / 2.0” //// (P)+-303in. lbs / +-460 in. lbs


  • H&R Sport //// 1.5” / 1.3” //// (P) N/A in. lbs / N/A in. lbs


  • Comptech Sport //// 1.0” / 1.2” //// (P) N/A in. lbs / N/A in. lbs

  • HFP Springs //// 1.0” / 1.0” //// (P) N/A in. lbs / N/A in. lbs


  • B+G Sport //// 1.6” / 1.6” //// (P) 25%+ in. lbs / 25%+ in. lbs



  • Swift Springs USA

    Swift Sport Springs

    CIVIC SI--2 Door-FG2--Front 2.3-4.0kg/mm--129-224lbs/in--Drop 30mm/ 1.2in----Rear 3.2-4.6kg/mm--179-258lbs/in--Drop 20mm/ 0.8in
    CIVIC SI--4 Door-FA5--Front 2.3-4.0kg/mm--129-224lbs/in--Drop 30mm/ 1.2in----Rear 3.2-4.6kg/mm--179-258lbs/in--Drop 25mm/ 1.0in
    CIVIC-----2 Door-FG1--Front 2.3-4.0kg/mm--129-224lbs/in--Drop 25mm/ 1.0in----Rear 3.2-4.6kg/mm--179-258lbs/in--Drop 15mm/ 0.6in
    CIVIC-----4 Door-FA1--Front 2.3-4.0kg/mm--129-224lbs/in--Drop 25mm/ 1.0in----Rear 3.2-4.6kg/mm--179-258lbs/in--Drop 20mm/ 0.8in
Part Number----4H913
 

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Here is some more info for the file:

Tanabe makes two versions of the GF210...one for the LX/EX and one for the Si. I have the details on the Si model:

They are also Linear.
Front drop = 0.6"
Rear drop = 0.5"

Front rate = 3.4kg/mm
Rear rate = 4.1kg/mm

They also make their DF210 springs for the Si. The GF210 series is described as being 20% to 30% stiffer than stock, whereas the DF210 series is described as being 15% stiffer than stock, yet these two sets of springs have the same spring rates! The only difference is the drop. However, the GF210 lowers the car 0.1" more in the front, whereas the DF210 lowers the car 0.1" more in the rear. But obviously Tanabe feels really strongly about these particular spring rates, for some reason. Anyways, here are the specs on the DF210 springs as well:

These are also linear.
Front drop = 0.9"
Rear drop = 1.0"

Front rate = 3.4kg/mm
Rear rate = 4.1kg/mm

I almost bought the GF210 springs, but then I found out that Swift is going to be releasing their Sport Mach lowering springs for the Si in the next couple of months, so I'm waiting to see the details on those before making my final purchase...but the Swift's basically already have my vote.

Although, based on the specs above (and thanks FA5SI!!), the Progress springs kinda intrigue me now, particularly since they sell for like $150 or something. Does anyone have them installed, and if so, how do you like them??

Brian
 

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In order to convert lbs/in to kg/mm, multiply the lbs x 0.0178579673.

So the Progress springs for example are 4.3kg/mm in front, and 5.9kg/mm in the rear.
 

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FG Civic Si FG Civic LX
Front spring rate 200 170
Rear spring rate 230 200

Wheel Rate Estimates
Front wheel rate 190 161.5
Rear wheel rate 138 120

Wheel F/R bias 1.38 1.35
 
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