Hey all! So a month ago I moved over from a 2015 Lexus IS 250 F-Sport to a 2013 G37xS. I already knew ahead of time that compared to the Lexus the Infiniti would not be as refined in interior quality or smoothness of the ride but nonetheless I feel as though the car makes a bit too much noise with the plastics inside and the bumps feel rough. There might or might not be a solution but I figured I'd ask in case anyone figured out a way to fix it. I'll list my tire detail in case this is all being caused by the tires on the car which came from the dealer.

Tire:
Dunlop SP Sport Maxx
Front Tires: 7/32
Rear Tires: 5.5/32

From my research it seems these tires aren't the best and does give a rougher ride but I'm not sure if it's a big or small difference. Hoping your experiences can help here before I think of getting new tires. Let me know if you can help out at all! Thanks a ton!

 

yeah a change of tires will help but it still wont be as good as a lexus. There maybe some coilovers out there that give a better ride and still drop the car but I haven't heard of any and I'm sure they'd be pretty expensive. Other than that you might want to buy a different car sorry to say.

 

The F-Sport has a sport suspension, right? Because your G37xS Sedan does not. That little red "S" on the AWD Sedan only means you've got sport seats and flappy paddles. But the steering, brakes and dampers are the same as the non-sport. The G should probably feel a little more floaty. However, if you're saying the opposite, then yeah... maybe you got the wrong car. The Lexus IS 250 had a 2.5L four banger with what... 200hp? The power in your G should be way better.

There's no right or wrong. Everyone has different priorities.

 

Hmm could be. Unfortunately I'm not looking to spend that much to enhance the ride quality but I might look deeper into the tires and see if that might fix the issue.

 

Correct, the F-Sport does have a sport suspension and the tire's side walls are a lot more thinner so I just expected this ride to be of equal or slightly lesser.

It may be the tires, one thing I've noticed is the impact of the bumps on the road feel very stiff which causes noise in the car and what not. The Lexus handled the bumps very smoothly and I believe this quality is large from the quality of your tire.

The power in the G37 is definitely awesome, just want a bit more smoother ride. Hopefully I can fix that somehow.

 

getting thinner tires is only going to make the ride even more bumpy. If you want a smoother ride you are going to need coilover.

 

IME a coilover setup (at least the ones available to the AWD Gs) will result in a firmer ride regardless of the damper settings. The coilover spring rates available to the AWD platform are all higher rates than the OEM springs. Even if you take out most of the damping w/ the adjusters and rely more on the springs, the higher rates will end up resulting a harsher ride.

The only lowering option for the AWDs that has similar spring rates to OEM would be Tanabe Lowering Springs, but these tend to lower the rear more than the front, so it can look a bit off.

Unfortunately there are no aftermarket Shock options either for the AWDs (I believe KYB &/or Tokico might make some OEM replacements, but not an upgraded damper), so the rough ride you are currently experiencing is about as smooth as you can really expect unless your current shocks have a lot of miles and are past their shelf life.

How many miles on your '13?

 

You might be able to shoehorn some Koni dampers into the OE damper bodies but it's no cheaper than a set of good tires.

 

Going with 17" wheels will give you more sidewall, cushier ride. Personally I didn't think the g37xs was stiff when test driving, but we all have our own standards to compare to. Even the g37s (stock suspension) is stiff, but not super stiff.

 

I just got rid of some run flats and those were harsh over bumps. Compared to those my Michelin A/S 3 feel sublime. Are you sure those aren't run flats?