Suspension

[tommika]

2010 4.6

Went to Miami, about 120 miles on I 95 and 20 miles on secondary roads, with 3 passengers and about 100 pounds of luggage in the trunk.
The ride was very good going but coming back empty the ride was "nervous" again.
Will softer shocks fix this ?

Also, I was amazed to see coming back, 28.7 MPG on I 95, at 70 MPH with cruise and A/C on. On secondary roads it was 24.8. Does Nitrogen in the tires have any effect on MPG ?

 

[dataguy]

Rather than turn this into Yet Another Flamewar About the Suspension, please take a look at this thread or this thread or search for "suspension" and scan for relevant topics. They will give some ideas about how to improve the situation for those who need it improved (on their own dime).

As for the mileage, those numbers are typical for all Genesis at that highway speed, regardless of the fill of tires. I've seen the argument about nitrogen, but so far, my mileage hasn't changed significantly since I've filled them with N2. But I did it mostly to keep the pressure level longer, not for the increased mileage or tire life claims.

EDIT: Oops, my bad...I see you're talking about the 2010, which supposedly tweaked the suspension based on complaints about the 2009. So you've already got the "improved" suspension. So either carry more weight in the trunk to improve the weight distribution or try some of the upgrades mentioned in the threads above.

 

[blasterguam]

2010 4.6

Does Nitrogen in the tires have any effect on MPG ?

Nitrogen in the tires should not have any effect given the air pressure is correct and you are diligent at keeping it that way. Since air is slightly greater than 78% (by volume, not molecular weight) you are not getting a lot by running tires on nitrogen. Plus many dealers waaaay overcharge for Nitrogen fills that should cost about a buck a tire - after all, nitrogen is the most plentiful gas in the atmosphere and is the cheapest gas to produce in a pure state. Those that use their cars for racing or other high performance applications have a better argument for using nitrogen.

There are several threads here on this very subject with many opinions and more information.

 

[ctrcbob]

2010 4.6

Went to Miami, about 120 miles on I 95 and 20 miles on secondary roads, with 3 passengers and about 100 pounds of luggage in the trunk.
The ride was very good going but coming back empty the ride was "nervous" again.
Will softer shocks fix this ?

Also, I was amazed to see coming back, 28.7 MPG on I 95, at 70 MPH with cruise and A/C on. On secondary roads it was 24.8. Does Nitrogen in the tires have any effect on MPG ?

Tom,


Your post is valid.

I also noticed that when I was carry passengers, or when I travel with a load in the trunk, the ride is better, but like you, gets nervous again when only myself in car. That being said, I guess I am getting used to the suspension after 13 months of ownership, because it does not seem to be as stiff as it used to me.

As for your milage, I have found the same as you. I get better on the Interstates than I get on the blue roads. Normal I guess. As for Nitrogen, yes I have it in my tires, only because my dealer installs it free both when you purchase the car and anytime I go in for service, (or anytime I request it), all FREE. As was said before, It is not going to do squat to get better gas milage. Pressure is pressure. I use it only because it is free, however when I took my last trip out to New Mexico in December, I know it was going to be cold out there, so I added an extra 4 lbs pressure, from my own compressor, with air. When I returned to Florida, went to dealer, and my tires were still good. "If its free, I'll use it". "If I have to pay for it, I won't use it". (almost sounds like something else, don't it?)

 

[Disaster]

2010 4.6

Went to Miami, about 120 miles on I 95 and 20 miles on secondary roads, with 3 passengers and about 100 pounds of luggage in the trunk.
The ride was very good going but coming back empty the ride was "nervous" again.
Will softer shocks fix this ?

Also, I was amazed to see coming back, 28.7 MPG on I 95, at 70 MPH with cruise and A/C on. On secondary roads it was 24.8. Does Nitrogen in the tires have any effect on MPG ?

Softer shocks would most likely hurt the ride as the Genesis sedan gives all indications of being oversprung and underdamped. Stiffer shocks would cause less "nervousness." Softer springs would better match the shocks but the ride could probably still use shocks with more large frequency rebound damping. I don't know of an easily available substitute for either.

If one were to know the spring size one could probably find a spring to work, as they are pretty common sizes used among many different vehicles. There are also custom spring shops. The Genesis is new and the U.S. sales is too small to generate much interest in aftermarket parts.

 

[GripperDon]

Since I have it available free to me , as I have previously posted, I fill my tires with ARGON. No effect on mileage but since PV= MRT and the only difference we can control is M the change in P caused by T is a bit better with Argon. Not enough to be worth the terrible cost of Argon but it is truly inert and should reduce the rotting of the tire from the pressurizing gas. Finally the size of the molecule is bigger than Nitrogen so leakage may be reduced. All of the stuff about the filling gas of the tires is IMO opinion is mostly BS.

 

[Seattle Genesis]

Ive been online to the local Hyundai dealer parts website and I see there are a few entries for rear and front suspension. There are two buttons to click on. one says FROM 06/15/08 and the other says TO 06/15/08. This suggest to me there was in fact a change to the suspension as most have said here on this forum. Still not knowing what that change is, is still eluding most of us. Just thought I would share some more redundant grief about the suspension issues SOME OF US are having.


If there is anyone in the Seattle area that wants to get together and compare rides I would love to meet up with you.

Thanks,
Seattle Genesis

 

[GripperDon]

Shocks

 

[RonP]

Back in the '50's, When my Dad had 1954 Chev. He made a comment, after giving 3 people a ride across town..............."The car really rides better with more weight in it".

 

[ggienger]

2010 4.6

Went to Miami, about 120 miles on I 95 and 20 miles on secondary roads, with 3 passengers and about 100 pounds of luggage in the trunk.
The ride was very good going but coming back empty the ride was "nervous" again.
Will softer shocks fix this ?

Also, I was amazed to see coming back, 28.7 MPG on I 95, at 70 MPH with cruise and A/C on. On secondary roads it was 24.8. Does Nitrogen in the tires have any effect on MPG ?

You’re receiving about the same mileage I got from Atlanta to PC and back 28.4 with only 600 miles on the engine. Yes a different rate of shock recoil will give you a softer ride. The V8 is a performance unit and stiffer (return rate) than the 3.8. Nitrogen will not affect gas mileage, but is will reduce tire deterioration rates. They use in aircraft tires to resist heat/cold expansioncontraction, deterioration and moisture.

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[HeavyG]

You’re receiving about the same mileage I got from Atlanta to PC and back 28.4 with only 600 miles on the engine. Yes a different rate of shock recoil will give you a softer ride. The V8 is a performance unit and stiffer (return rate) than the 3.8. Nitrogen will not affect gas mileage, but is will reduce tire deterioration rates. They use in aircraft tires to resist heat/cold expansioncontraction, deterioration and moisture.

I can see aircraft using nitrogen in their tires - they go through extremes in temperature through huge changes in altitude, landings, and hard stops. Car tires, not so much.

 

[Seattle Genesis]

Ive noticed the ride is much better with a full tank of gas. Must be the weight in the back making it much heavier and balancing out the suspension.

 

[Mark_888]

Ive noticed the ride is much better with a full tank of gas. Must be the weight in the back making it much heavier and balancing out the suspension.

That is correct. The springs tend to overpower the shocks if there is not much load on the rear. This is more so on the 2009 than the 2010 (they adjusted the spring and shock rates on the 2010), but probably both model years to some degree.

I have also noticed that the springs get a bit softer as the car get a little older. Not much softer, but just enough to make it acceptable. My rear springs were on cocaine when they were new.

IMO ambient temperature can make a slight, but perceptible difference also (cold is worse than hot). Hyundai should be careful about fine tuning the suspension of the cars at their facility in the Southern California desert.

 

[GripperDon]

Changed April 8, 2009

 

[William R.]

Just talked w/local sales mgr where we bought our Genesis w/3.8 engine in 1/09, & he said they slightly softened the suspension in mid-09. My main problem was sharp jolts when hitting potholes I erroneously didn't avoid during our trips to & around S. CA. (CA has to be at the top, or nearly so, of a bad road list ranking states' roads). I solved that w/a LTV cushion - http://tinyurl.com/yzj5nl6.

 

[Jay]

I just checked my 3.8 build date which is May 02 2008 and right below the sticker is another yellow strip which says, CAUTION LOAD CARRYING CAPACITY REDUCED: Modificaton to this vehicle has reduced the original load carrying capacity by, ____kg or lbs____ but nothing was filled in. I'll have to check with the Hyundai dealer in Roseville. Don't know if this was changed before my purchase or during servicing...

 

[Disaster]

Interesting. That suggests softer springs.

 

[Jay]

I spoke to Hyundai, they thought the mod sticker was added at the port of entry, had something to do with the dunlops and or the towing capacity of the car per the nhtsa...nothing was done at the dealership...also this was one of the early models of the car. Didn't get a specific answer to how much of a load change there was. Oh well...

 

[Slovaman]

The best way to solve the suspension problem is to turn the car back in. I did that because I could not handle the stiffness anymore. The dealer took the car back and gave me $146.00 on top of it. I still had 15 months remaining on the lease.

Although they stated that the 2010 was much better suspension wise, I think I will continue driving my 2002 Sonata with 151,000 miles. It is paid for and rides a lot smoother.

 

[GripperDon]

I spoke to Hyundai, they thought the mod sticker was added at the port of entry, had something to do with the dunlops and or the towing capacity of the car per the nhtsa...nothing was done at the dealership...also this was one of the early models of the car. Didn't get a specific answer to how much of a load change there was. Oh well...

Changed April 8, 2009