Rep Power: 379

OK everyone I have an 03 Coupe and have a fully fiberglassed trunk. I had Eibach Sportlines on the car, but the stereo made the back sag too much. I've heard of using sedan springs for a higher load rate, but I'd like to see if anyone has tried it yet and get some feedback. The car is back on stock springs now and still sags a little. So now I need to sell these Eibachs and buy something new.

 
Rep Power: 412

it is not the springs, it is the shocks. get new shocks and maybe some springs with higher spring rates. Just getting higher spring rates won't do much. There aren't any springs that have higher spring rates than sportlines. Most springs will only be at most 35% stiffer than stock. You can get custom spring rates for many companies or get full coilovers.

 
Rep Power: 379

So is the sedan myth busted?

 
Rep Power: 412

what myth?

 
Rep Power: 323

Get the sedan version of the sportlines, This should help a bit with your sagging problem. It may not solve it depending on how much wieght you have back there, but it will help.

 
Rep Power: 0

I would suggest coilovers then if you add more weight you can just raise them up and keep the car even

 
Rep Power: 379

Coilovers (sleeved anyway) seem way too harsh. I liked the Eibachs but the sagginging sucked. The ride WAS nice though.

 
Rep Power: 320

I have sportlines and my back does sag a little, but o well.. my subs weigh a ton..

 
Rep Power: 0

Yup, it is the shocks. The spring will help but in the long run you will have to replace the shocks and springs because the shocks will give out and too much weight on the springs over time will damage them. You might as well solve the problem now instead of waiting till this happens. I had the same problem with my sedan. I had a full custom trunk that weighed a ton. Over time my back shocks gave out and forced me to go another route. I got bags because I had my system was built with all wood, but fiberglass wont weigh as much so you should be safe with a true coilover setup. Maybe look into Teins or something similar. I just reciently changed to Teins SS and love the ride, handling, and its ability to hold up the weight.

 
Rep Power: 0

I previously had progress springs, and when I had a sub and box in the back around 75lbs the back end would sag a little. I switched to a lighter sub setup and it made a world of difference not only in the ride height, but also in the accleration of the car

 
Rep Power: 379

Changing the box isn't an option though. It's fiberglassed into the tire well. 4.2 cuft for 2 Diamond TDX 10's.

 
Rep Power: 448

if your staying with the spring set-up...
i would suggest going with the sedan versions (like the Neuspeed or GoldLine)

 
Rep Power: 283

I have the tokico blues and my backend sags because of my stereo. maybe, but maybe because I have coupe springs in a sedan. I dont think the shocks are the answer I think it is the springs.

 
Rep Power: 0

Just airbag the whole car, you can adjust ride hight at front for more rake, or even corner to corner when you park you can drop it on the floor.

 
Rep Power: 276

eibach sportines are known to sag your rear for some owners.
have you tried taking out your system of your trunk and see if the rear still sags? new springs wont do as much as if you were to replace some better shocks. your better off investing into shocks. if you wait til you blow them out, then your lose OEM shocks and start looking into new ones.