BustedKnuckles1122 Posted December 9, 2017 Share Posted December 9, 2017 Hey guys, The guy I bought my LGT-L from had advertised the coilovers as so: Fortune Auto 500 series Generation 5, 5k(spring rate) iin the front and 7k in the back. And said he bought them from a user on this forum. Well, my front passenger side started leaking and I was planning on replacing the front pair. When I went to the Fortune Auto site and entered my make and model it defaulted the spring rates to 8k in the front and 6k in the rear. My concern isn't necessarily with the numbers, but with the fact that the front spring rate was higher in the front than the rear. And mine were advertised in the opposite order. So now im not sure whether to purchase the 7k or the 5k. I took the wheel off and looked at the coilover and saw nothing about spring rate. Only was able to confirm they were fortune auto 500 series. Does anyone have any insight on this? Link to comment Share on other sites More sharing options...
Becks1818 Posted December 9, 2017 Share Posted December 9, 2017 Front spring will be a higher spring rate as they support more weight and are engaged a lot more than the rear during handling . Link to comment Share on other sites More sharing options...
BustedKnuckles1122 Posted December 9, 2017 Author Share Posted December 9, 2017 That's initially what I thought, and the car performs in accordance with that. But i cant find confirmation of it on the coilovers Link to comment Share on other sites More sharing options...
GTEASER Posted December 11, 2017 Share Posted December 11, 2017 Typically for our cars, and most modern Subarus, you want the rear to be equal to or 1k less than the fronts. 2 steps softer on the rear is too much. If they are equal, you get a little more oversteer (or less understeer). RCE offers their Tarmac 0 for our cars with the same spring rate all the way around. Their lowering springs are the same. They more than anyone else have done significant R&D on our platform. OEM 2011-2014 STi for instance are actually 240f/300r pound springs to produce oversteer for that model, and Subaru did much R&D. Keep in mind that the shocks need to be valved for the spring rates. Previous generation Subarus (ie GC, GD chassis WRX, SF, SG chassis Forester, and BC, BD chassis Legacy) have a different suspension in the rear with a different suspension geometry moment of inertia, so they have always used 2 steps softer in the rear. Unfortunately many coilover companies have carried that through to the modern Subarus without doing the R&D to optimize the setup. GTEASER's 2012 Legacy GT - Sold GTEASER's 2009 XTeaser - Sold GTEASER's 1992 Legacy SS - Sold Link to comment Share on other sites More sharing options...
A_A_ron Posted December 11, 2017 Share Posted December 11, 2017 You guy might be confused on the spring rates unless you can look at them to confirm it somehow. I would not be surprised if he went 7k front 5k rear as that is 1 step softer from the recommendation and would give you a comfy ride. Build Thread Link to comment Share on other sites More sharing options...
BustedKnuckles1122 Posted December 13, 2017 Author Share Posted December 13, 2017 So I verified today that I have 7k front fortune auto generation 5 shocks in the front and 5k in the rear with matching swift springs all around (7k front and 5k rear) Link to comment Share on other sites More sharing options...
BustedKnuckles1122 Posted December 13, 2017 Author Share Posted December 13, 2017 Typically for our cars, and most modern Subarus, you want the rear to be equal to or 1k less than the fronts. 2 steps softer on the rear is too much. If they are equal, you get a little more oversteer (or less understeer). RCE offers their Tarmac 0 for our cars with the same spring rate all the way around. Their lowering springs are the same. They more than anyone else have done significant R&D on our platform. OEM 2011-2014 STi for instance are actually 240f/300r pound springs to produce oversteer for that model, and Subaru did much R&D. Keep in mind that the shocks need to be valved for the spring rates. Previous generation Subarus (ie GC, GD chassis WRX, SF, SG chassis Forester, and BC, BD chassis Legacy) have a different suspension in the rear with a different suspension geometry moment of inertia, so they have always used 2 steps softer in the rear. Unfortunately many coilover companies have carried that through to the modern Subarus without doing the R&D to optimize the setup. So in your opinion, would I be better off replacing with 6k as to keep only a 1k difference? And if so, will that produce more body roll? Link to comment Share on other sites More sharing options...
GTEASER Posted December 13, 2017 Share Posted December 13, 2017 So in your opinion, would I be better off replacing with 6k as to keep only a 1k difference? And if so, will that produce more body roll?I would put 6k in the rear. It will allow less body roll and also alter the balance a little more toward a tendency to oversteer. The shock valving you have now should be able to still damp the heavier springs sufficiently. If you are having them all rebuilt, go with 7k all around and have them valved for that. GTEASER's 2012 Legacy GT - Sold GTEASER's 2009 XTeaser - Sold GTEASER's 1992 Legacy SS - Sold Link to comment Share on other sites More sharing options...
BustedKnuckles1122 Posted December 16, 2017 Author Share Posted December 16, 2017 I would put 6k in the rear. It will allow less body roll and also alter the balance a little more toward a tendency to oversteer. The shock valving you have now should be able to still damp the heavier springs sufficiently. If you are having them all rebuilt, go with 7k all around and have them valved for that. Thanks man, I appreciate the help Link to comment Share on other sites More sharing options...
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