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Old 12-26-2010, 01:43 AM   #1
haisofly
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Question Rough Suspension

Hey guys, I just did my 6k checkup on my gtr. i told the dealer that i wanted the suspension to be adjusted to street mode and not race/aggressive mode so i can have a smoother ride. while driving, i notice that the suspension seems stiffer than normal and that i was feeling every bump on the road. do u think that the dealer did a wrong adjustment or what can be causing this problem?
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Old 12-26-2010, 02:41 AM   #2
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It's possible the new alignment setup will change some variables in the suspension to create more stiff on the car. You should get a copy of report after the alignment is done, if not, ask for one.

Street alignment spec:
Front Camber: -1.51 deg to -1.44 deg (nominal: -1.48 deg)
Caster: 5.24 deg to 6.23 deg (nominal: 5.73 deg)
Kingpin inclination: 9.24 deg to 9.56 deg (nominal: 9.40 deg)
Toe in angle: out 0.03deg to in 0.06 deg (nominal: in 0.02 deg)

Rear:
Camber: -1.73 deg to -1.40 deg (nominal: -1.57 deg)
Toe in angle: out 0.01 deg to in 0.15 deg (nominal: in 0.07 deg)
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Old 12-26-2010, 11:07 AM   #3
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thanks for the reply. so the street alignment is suppose to make the car smoother right?
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Old 12-26-2010, 11:54 AM   #4
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The main purpose of the street alignment is to be less aggressive on the tires, so they don't wear so fast. It could possible affect the car to be less stiffer than the Performance Sport alignment setup, but unless the alignment is totally off, you shouldn't feel major difference IMHO.
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Old 12-27-2010, 01:16 PM   #5
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Also, check that your tires haven't been over-inflated. And, for what little difference it makes, put the suspension toggle switch in "Comfort" mode each time you start the car.
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Old 12-27-2010, 05:42 PM   #6
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^^^^ Yeah that. After getting a recent alignment my Tires were way over inflated, causing and extremely rough ride.
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Old 12-27-2010, 06:41 PM   #7
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tires are inflated at 34psi. too much nitrogen?
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Old 12-27-2010, 06:56 PM   #8
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Mine were at 42 psi.....and it was crazy harsh. I could feel every single pebble on the road. I think 34 is fine, I'll go out and check to see what mine says now....give me one minute
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Old 12-27-2010, 07:02 PM   #9
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Thought 29 lbs. was the correct pressure.
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Old 12-27-2010, 07:05 PM   #10
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Mines at 33/34 all the way around.
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Old 12-28-2010, 12:47 PM   #11
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Bleed the tire pressure to 29 psi (or at least down to 30) and that should help soften the ride, and better match the recommended pressure.
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Old 12-28-2010, 04:28 PM   #12
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Not to sound like a complete Noob, but I'm running 20x10 fronts and 20x11 rear wheels with OEM runflats. Should I still run 29-30 psi with 1/2 larger wheels or a couple pounds more. Only asking cause the shop that mounted tires suggested a couple lbs more.
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Old 12-29-2010, 12:17 PM   #13
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Increasing your tire pressure will reduce the size of your tire's contact patch on the road. Probably not what you're trying to do. I'd stick with the OEM recommended pressure.
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Old 12-29-2010, 04:12 PM   #14
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The only setting in an alignment that will cause increased road feel is the caster setting. If you get too much positive caster, it transfers more of the suspension energy towards the passenger compartment, but this setting also provides better handling characteristics.

I would get a copy of the alignment spec sheet and type out or scan it so I can check it quickly.

Our customers who run the K&W Clubsport coil overs say the car rides more comfortably then stock, and handles better on the road course, so that may be a modification to consider if you are able to go to a shop that can properly install and corner balance your vehicle.
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Old 12-30-2010, 02:43 AM   #15
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here is the aligment
Attached Files
File Type: pdf aligment.PDF (157.9 KB, 101 views)
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Old 12-30-2010, 12:58 PM   #16
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Not sure what is up with the technician that did your alignment...

Camber is set to performance levels in the front, you want -1.48 and you are set to -1.6 .

Caster should be at ~5.7 and you have non matching caster of 5.3 and 5.9, this can induce a pull to the left while driving on flat roads.

SAI and IA are numbers used to find bent parts, but improper alignment settings can cause this to look off when they are fine.

In the rear, they got the left side right but didn't touch the right side, with the offset camber its going to want to track the rear of the vehicle slightly to the left.

Looking at the alignment sheet, it looks like the technician that did the work was happy with "close enough".
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Old 12-30-2010, 07:26 PM   #17
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thanks a bunch jared. im gonna take it to another dealership tomorrow with this finding and see what they have to say. will keep u inform
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Old 12-31-2010, 06:28 PM   #18
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Default rough ride

dont you set the ride to soft. it is the center swich on your dash hold it down and green light comes on it is the softest ride you can get also you can run non runflat as i have been doing for two yrs that really makes a difference.
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