I’ve been driving on swift springs and eibach sways now for a few weeks and I absolutely love the looks and handling of the car. Everything feels so responsive and tight. However the ride is quite a bit harsher, I would say it is livable but just barely. The car has lost that semi luxury car like ride entirely. I feel like in the long term I am likely to get tired of this ride quality. I know many around here and swift themselves claim that these springs maintain an OE like ride, but I haven’t found that to be the case in my experience. Maybe it is the springs, or the sways or both. That brings me to the question of if it is even possible to lower the car 1-1.3 inches and maintain OE ride quality? Would something like KW V1s be able to do it? I don’t care about increasing performance any further as the current setup already handles fantastically but would a high quality coilover setup really make it much better than swifts? I guess if it is not possible I need to just live with it and accept it or go back to stock springs. My gut feeling is that no matter what setup you buy, the car will never ride as plush as stock.

At the moment my rear alignment is still screwed up and my tires are just about dead so I will try to get that fixed/replaced and see if it helps at all.

 

Listen to your gut, it speaks the truth.
No springs or coils will be as forgiving as the OEM setup, it's designed as a compromise to provide a more comfortable ride to the masses. Aftermarket springs have to be firmer to keep the springs from slamming the bumpstops on every large bump, coilovers can be adjusted to be softer than OEM dampers but then you'll get a floaty feeling that's worse than the firmer ride.

Hopefully you can deal w/ the sacrifice in comfort for a bit more connection to the road, but if not there's a good market for Swift springs in the classifieds here.

It took some getting used to w/ my firm B&G springs and my coilovers are quite a bit better in that regard. My springs were quite a bit lower than Swifts though, you should have more compliance w/ Swifts.

 

In my experience aftermarket springs never pair well with OEM shocks.

My swift + Koni setup is only marginally harsher than stock and not at all objectionable. If it was, my wife would never want to take my car anywhere with the girls (age 1 and 3). As it is, you can barely tell a difference when driving normally (ie with wife and kids on board).

That said, the roads in NC are pretty smooth, and the S sedan has a little more sidewall on stock size tires, so YMMV.

 

Ride Quality works something like the chart I made below, this is subjective and rather general, but still useful. It also shows that I think the difference you will achieve will be marginal at best. I wouldn't be able to justify the cost of parts and labor to make the switch, at this point it's probably best to stick with what you have or go back to OEM to fulfill what you desire. Possibly try the springs you have currently without the sway bars. This may bring the ride comfort back into the acceptable range for you. This list is not all inclusive, just lists some of the more common setups. Assumptions for the coilovers adjusted perfectly are that the car's height is within the ideal range of operation and the spring preload is set independent from the height. It is also assumed that the coilovers dampening has been professionally matched to suit the ride height and the car is lowered evenly and balanced. Assumptions for the lowering springs is that they are operating in conjunction with OEM struts, as aftermarket shocks will increase handling at the cost of ride quality. The deeper the drop, the less suited the OEM dampers are, lowering ride quality. Lower quality coilovers will have artifacts in the ride quality that lowering springs will not have, some possibilities include clunking, unpredictable behavior on very poor roads, poor spring rates - ranging from "jarring" to "bouncy", etc. All setups assume camber kits are installed to allow an in-spec alignment.

Best Ride------------------------------------------------------------------Worst Ride

[OEM]---------------------------------------------------------------------------------
--------[Quality Coilovers set perfectly]---------------------------------------------
---------[Quality lowering springs with modest drop]------------------------------
------------------------------[Quality lowering springs with deep drop]------------
---------------------------------[Cheap coilovers adjusted perfectly]---------------
---------------------------------------------------[Cheap Coilovers adjusted poorly]

 

IMO Eibach is the best at supplying a modified look with keeping fairly true to OE ride quality. If you are not looking to go too low I think that would be the best product choice. Proven time and time again

 

Also most that lower their Gs also are getting bigger rims w/ lower profile tires, often doing this all at the same time. If you go from 17s or 18s on the OEM suspension, then going w/ 20s and 30 series sidewalls along w/ lowering springs/coilovers, the combination will be
a huge difference from the comfy OEM ride.

 

I disagree with the eibach comment as I've had them on our 10 sedan and it was rougher for sure. Not bad but noticable. I've had quite a few quality setups to compare to I'm going to steel Rynes little chart as reference

Best Ride------------------------------------------------------------------Worst Ride

[OEM]---------------------------------------------------------------------------------
---------[KWv3]-----------------------------------------------------------------------
------------------[KWv1 & H&R Springs]---------------------------------------------
------------------------------[Eibach]-------------------------------------------------
---------------------------------------------------------[BC Coilovers]---------------
[Airlift Air Struts]---------------------------------------------------------------------

Believe it or not I would say the airlift is more comfortable than OEM, as well as handling better than my KWv3 on my twin turbo coupe. It made my KWv3 seems like junk, which they are not. If you can afford it the air is the way to go. Keep in mind air does have it's quirks and will require some initial tinkering to sort out 100%, but by far the best option.

 

That's pretty in line with what I suggested. We both agree on a key point though - someone who wants an OEM-like ride will be miserable on a set of economy coilovers, no matter how they are adjusted. Your addition of Air at an OEM-like quality seems appropriate. Surprised about H&R being more comfortable than Eibach, but I have only experienced Eibach - i am pretty happy with the ride quality overall. Even if the ride is a bit better, I don't know if I would be happy with how much I'd scrape (already very close a lot of places I go on Eibach).

 

I installed only Eibach springs on my g37x coupe.
I love how it looks, but the ride quality is not as good as OEM.
Would that looking be funny if I go back to OEM springs with 19'' OEM sports rims??

 

No, the look will be OK, just a bit higher than stock 37S coupes w/ the same rims.

As far as cheaper coils being worse than springs, maybe I just got lucky but my Megan LP coils are quite a bit better than my previous spring setup and a better ride than my friends Eibach dropped G37 coupe.
Got about 25k miles on them now and w/ the exception of washboard type bumps they handle real well overall.

 

Well I will admit I have no idea how eibachs are on the coupe but my experience with them on my previous car was great. I am considering them again but I am also considering coils so idk. If you are looking for "budget" options that Air Ride suggestion wont work...those run like 5 grand! Question, since we are on the subject, are Koni the only shocks available for our cars?

 

I own a 2009 g37x coupe.
I installed oem sports bumper, sports rims, and Eibach springs only.
I like how much low my car is with the eibach, but it feels too stiff for me.
Some people say that eibach spring has almost same ride quality as oem, BUT you would feela big difference

 

especially when you pass in a construction area or even on a small bump.
I feel almost everything through my buttttttttt!!
I had a q50 as a loaner's car last week and I loved the ride feeling. Very soft and comfortable!!!
Can I have a lexus or q50 sedan ride feeling with any other springs or coilover or shocks or air suspensions ?

 

Your coupe looks a little bit lower than mine does. I also have an X Coupe with Eibach. Did all of your bushing, isolators, etc. get transferred over when you had the Eibach springs put on? This will make a noticeable difference in the harshness of the ride. Also, are you sure you ordered the spring for the X Coupe and not the RWD or other variant? Eibach actually has different part numbers for each model and this could affect the ride quality for you. Post the part number and I can verify for you.

 

I ran true airlift struts w accuair and had ilevel elevel, the works. The 5 grand quote is an uneducated guess. I had roughly 3400 in my setup and could be had for 700 or so less with smaller compressors and spare the ilevel, elevel I believe is a must for a dd. That being said a good pair of coils can run between 2-3k so with the added comfort and benefits it's really not out of the picture. You can spare even more if you run bag-over kits