R spec anti-roll bars on a 4.6

[jeder9999]

Anyone know if the R spec anti-roll bars are any bigger, and if so, by how much? Part numbers? Want to install them on my 4.6 if they are larger.

 

[armycamacho]

Ditto

 

[Mark_888]

Starting in 2012 (first year of R-Spec) the rear anti-sway bar is the same for all Genesis sedans (V6 and V8). It has bigger diameter than before, but it is now hollow (was solid). If you have a pre-2012 Genesis Sedan, I would recommend that you install it as it will retain stiffness but actually make the ride less harsh over bad roads. There is a thread on this subject by someone who has done the replacement.

Obviously, due to the extra weight of the V8 vs V6, the front anti-sway bar is different for these engines. Not sure how the R-Spec front anti-sway bar compares to the other Genesis V8 ones.

 

[EXBMWGUY]

Scottdk did the replacement.

 

[brfatal]

Starting in 2012 (first year of R-Spec) the rear anti-sway bar is the same for all Genesis sedans (V6 and V8). It has bigger diameter than before, but it is now hollow (was solid). If you have a pre-2012 Genesis Sedan, I would recommend that you install it as it will retain stiffness but actually make the ride less harsh over bad roads. There is a thread on this subject by someone who has done the placement.

Actually, a larger sway bar will reduce ride comfort as it reduces side to side suspension independence.

 

[Mark_888]

Actually, a larger sway bar will reduce ride comfort as it reduces side to side suspension independence.

I don't want to get into a theoretical argument about this. The 2012 ride is more comfortable than pervious years (by Hyundai's claims, and universal agreement), and the 2012 anti-sway bar is a larger diameter, but now hollow (it was solid before). Exactly how it works from a suspension engineering point of view, I am not sure, but many people with a 2009-2011 model that made the switch said that the ride is less harsh on bad roads with the 2012+ anti-sway bar.

 

[brfatal]

I don't want to get into a theoretical argument about this. The 2012 ride is more comfortable than pervious years (by Hyundai's claims, and universal agreement), and the 2012 anti-sway bar is a larger diameter, but now hollow (it was solid before). Exactly how it works from a suspension engineering point of view, I am not sure, but many people with a 2009-2011 model that made the switch said that the ride is less harsh on bad roads with the 2012+ anti-sway bar.

Hollow vs solid is just weight savings. The ride comfort changes between models are largely due to other changes. Improving the valving and spring rate matching is likely the single biggest cause. They did, after all, replace these parts. I can't explain it would be reported that the ride isn't as harsh with a larger sway bar, given that it's been a long accepted practice by some non-street performance modders (off-roaders, cruisers, etc) to remove sway bars all-together to improve ride quality. *shrug* The simplified science of it is that thicker sway bars transfer more load to the other side of the car by linking the the left and ride sides together, which reduces roll by reducing independent suspension travel. Your car doesn't know the different between body roll and a bump in the road, so the 2 go hand in hand, which leads to a stiffer ride.

 

[Mark_888]

Hollow vs solid is just weight savings. The ride comfort changes between models are largely due to other changes. Improving the valving and spring rate matching is likely the single biggest cause. They did, after all, replace these parts. I can't explain it would be reported that the ride isn't as harsh with a larger sway bar, given that it's been a long accepted practice by some non-street performance modders (off-roaders, cruisers, etc) to remove sway bars all-together to improve ride quality. *shrug* The simplified science of it is that thicker sway bars transfer more load to the other side of the car by linking the the left and ride sides together, which reduces roll by reducing independent suspension travel. Your car doesn't know the different between body roll and a bump in the road, so the 2 go hand in hand, which leads to a stiffer ride.

According to several people on this forum who only changed the rear stabilizer bar on their 2009-2011 Genesis with the 2012+ rear stabilizer, the ride is less harsh now. Maybe harsh is the wrong word, because some of the problems with 2009-2011 suspension are complicated and not as simple as stiff vs. not-stiff.

 

[jeder9999]

Does anyone have the diameter of the front R-Spec bar? I'd like to install the R-Spec bar on my 4.6 if it's bigger. Thanks.

 

[scottdk]

Does anyone have the diameter of the front R-Spec bar? I'd like to install the R-Spec bar on my 4.6 if it's bigger. Thanks.

According to MotorTrend the 2009-2011 front sway bar is 25mm and rear 18mm. 2012-2014 are front 26mm and rear 19mm.

I've replaced the rear bar on my 2009 4.6 with the 2012 bar. I actually didn't realize that the front bar on the 2012 was also larger vs. the previous years. Looks like I might have to order that up in addition to the R Spec springs and shocks in the spring.

But while it has been relatively well-received, Hyundai kicked things up a bit this year with the debut of the performance-tuned 2012 Hyundai Genesis 5.0 R-Spec, featuring Hyundai's new 5.0-liter GDI (gasoline direct-injected) V-8 that pumps out 429 horsepower and 376 lb-ft of torque through an eight-speed automatic transmission. It has larger brakes (up from 13.0 inches to 13.6 front and rear) clamped by four-piston calipers all the way around. The suspension has been retuned with 25- to 30-percent stiffer Sachs Amplitude Selective Damping shock absorbers; the rear multilink is tauter; and the anti-roll bars each are 1 millimeter larger -- now 26mm and 19mm front and rear, respectively.

Read more: http://www.motortrend.com/roadtests...enesis_5_0_r_specs_second_take/#ixzz2uaEyf6ZP

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[ShadowZ]

scott, I hate to sound creepy if I am correct, but were you in Eagan, MN when you shot the HID glare vid on your youtube page?

 

[Mark_888]

According to MotorTrend the 2009-2011 front sway bar is 25mm and rear 18mm. 2012-2014 are front 26mm and rear 19mm.

By looking at www.newhyundaiparts.com it appears that for 2012-13 the front stabilizer bars are the same for all trim levels (3.8 V6, 5.0 V8, and R-Spec 5.0 V8). As previously noted, that is the same situation as the rear stabilizer (same exact part for all Genesis sedan trim levels).

Probably the same for 2014, but that site does not have 2014 parts catalog up yet.

For 2009-2011 it looks like front stabilizer was the same for all trim levels also, except there were different ones depending on whether the car had auto leveling headlamps.

 

[scottdk]

scott, I hate to sound creepy if I am correct, but were you in Eagan, MN when you shot the HID glare vid on your youtube page?

Nope - I was in Elk River

 

[scottdk]

According to MotorTrend the 2009-2011 front sway bar is 25mm and rear 18mm. 2012-2014 are front 26mm and rear 19mm.

I've replaced the rear bar on my 2009 4.6 with the 2012 bar. I actually didn't realize that the front bar on the 2012 was also larger vs. the previous years. Looks like I might have to order that up in addition to the R Spec springs and shocks in the spring.



Read more: http://www.motortrend.com/roadtests...enesis_5_0_r_specs_second_take/#ixzz2uaEyf6ZP

I'm thinking the article from MotorTrend is not correct regarding their statement about the front sway bar being larger diameter in 2012 than the previous years.

I just checked the part numbers with partshyundai.com and the part number are the same exact number for the front bar = 54810-3M800. The only different part number was for the Genesis with the halogen headlights (non-adaptive) which is 54810-3M600. In other words, the front sway bar on my 2009 4.6 is the same part that is on the 5.0 R Spec. I can't find any source proving the parts are actually different.

 

[jeder9999]

Any R-Spec owners have a measuring calipers you'd be willing to use to measure your front and rear sway bars?