Upgrading 2009 Suspension to 2010 Specs.

[Rey]

On a previous post I suggested owners check the dealers parts microfiche for changes. As far as I know no one has done this to date. Whatever, the parts microfiche is being sold on eBay as a PDF file for $6.99. http://cgi.ebay.com/ebaymotors/2009...Motors_Manuals_Literature?hash=item3caabf4e96.
I have the 2010 suspension so my interest in the subject is mild. Nevertheless, it is easy to leave through the PDF reviewing suspension parts to determine which parts were changed. A cursory look revealed that front shocks, rear shocks and rear sway bar were changed. I did not see any bushing changes, except with rear sway bar. What this means is that upgrading the rear suspension may be comparatively easy. Front shocks are a bit difficult to replace for the home mechanic, but rear shocks and sway bar replacements are fairly easy.

 

[Mark_888]

We are fairly certain the springs changed slightly, but not necessarily with new part numbers.

 

[ImInPA]

Any new part released by ANY manufacturer will always have its own part number. There would be no way to control inventory without this. In most cases, even the plant that manufactures the part is tracked. If there is no new part number, then there is no new part. Just how it is.

 

[Mark_888]

Any new part released by ANY manufacturer will always have its own part number. There would be no way to control inventory without this. In most cases, even the plant that manufactures the part is tracked. If there is no new part number, then there is no new part. Just how it is.

If there was a slight change to a part, it is not necessarily a new part number. That is particularly true if the old and new versions are exactly the same dimensions and are completely interchangeable (even though there could be slight difference between them).

These differences could be because the supplier of the part improved their quality control processes, changed the composition of the materials (different blend of metals in the case of a spring), or made slight adjustments to make sure their product meets the original Hyundai specifications. Or it could be that Hyundai changed suppliers, and the new supplier part is just slightly different for that reason.

In this case, HMA has stated that the spring rates changed for 2010, and I have no reason to doubt them.

In the software business, this is called slipstreaming, where changes are made without a new release number, or even without a new fix level.

 

[Rey]

Mea Culpa. My first view of the fiche was cursory. I looked again at rear springs. The V-6 rear springs were changed for 2010. The V-8 springs were not changed
The part number for the 2009 V-6 springs is 56350-3M300. The 2010 part number is 56350-3M301. Both are priced at $82.23 each.

 

[crepen]

If there was a slight change to a part, it is not necessarily a new part number. That is particularly true if the old and new versions are exactly the same dimensions and are completely interchangeable (even though there could be slight difference between them).

[rant mode on]
As an ops guy, that is BAD manufacturing practice. Fit form and FUNCTION must be identical even on a different rev of the same number.

How would your car handle if you replaced only one spring with one with a different rate?

In any even remotely well managed manufacturing operation, parts of same number, different rev can be thrown in the same bin without ANY impact.

As a veteran (no, I won't say how long) software guy, I can also safely say that if rev control on airplanes was controlled like most software, noone would live long enough to obtain top-tier frequent flier status.
[rant off]

If Hyundai puts springs with different rates under the same number, I want out, and I love this car.

cmr

 

[Mark_888]

[rant mode on]
As an ops guy, that is BAD manufacturing practice. Fit form and FUNCTION must be identical even on a different rev of the same number.

You are right about that. The one thing that I do know for certain is that Hyundai says they changed the spring rates for 2010, so my post was in response to "the part numbers are the same" and those who claim there is no difference between the 2009 and 2010 suspensions. Fortunately, it has been confirmed that the part numbers are in fact different for the V6 springs.

However, my original thinking was the possibility that Hyundai switched suppliers in order to obtain a more consistent part, but still have the same part number, as opposed to having different specs. Hyundai has claimed than only some people have complained about the 2009 suspension, and it does seem from reading this forum that the problems affected some people more than others, which could be just manufacturing variations of the same part. My springs have become noticeably less "edgy" in the 13 months I have owned the car, so it doesn't take much to feel a difference.

I have always commented that it is good thing that many of the software development projects I have witnessed were not developing software to run a nuclear power plant, or we would all be fried.

 

[GripperDon]

Shock and strut numbers changed also extension -00 to -01

 

[gipp]

So what is the final summary? What exactly has changed and is needed(part for part) for the 2009 4.6 to start behaving properly? Has anyone given it a try with success yet?

Just an FYI- the new issue of Motor Trend long term update says "the suspension is downright wrong-too harsh and unforgiving. Plain and simple, it is the wrong suspension tuning...Those who have never spent time in a comparibly sized BMW, Lexus or Mercedes may think this is how luxury cars drive, but they would be mistaken....In fact, I'll go as far as to say the suspension tuning in this car is inferir to those of mainstream sedans like Camry, Accord, or even Hyundai's own Sonata".

Gee, I think I read almost the same thing a year ago on this forum but the writer was called disloyal, without credibility and an exception to the rule. Just remember the D word-Denial....

 

[Mark_888]

So what is the final summary? What exactly has changed and is needed(part for part) for the 2009 4.6 to start behaving properly? Has anyone given it a try with success yet?

A member named genesis45 (I believe) switched out the parts on his 2009 with 2010 parts and it seemed to help. His brother is a mechanic and did the work. You can search for his posts using the forum search facility. I don't recall if he had a V6 or V8, but you should be able to check the part numbers on the suspension section of the above mentioned document. If I recall, genesis45 replaced all four springs and all four shocks on his 2009.

______________________________

Help support this site so it can continue supporting you!

 

[GripperDon]

Yes he did. You could send him a Pm and get the details as to actual part numbers. They are already listed around on the site and someone could make a nice list for you and post it or maybe you could, that would be nice also. He changed Rear springs ans shocks and front struts. He can best tell you what he thinks of the ride change but it did change. We had discussion about changes to the anti sway bar and one member posted a discussion about the bushings holding it and what may have been changed their also.

Mainly all the new part numbers are the old part numbers except that the hyphenated extension has been changed from -00 to -01.

A shame that Hyundai would not make this info available, also the change out time was short less than 30min per corner after it on the lift. If you only do the rear a new alignment is probably not necessary. However changing the struts would suggest a new alignment is required. If getting a new alignment consider a tad bit more toe in to reduce the Gennis tendenancy to wander and be so crown sensitive.

So if you want it softer:
1. Reduce the rim diameter 1 inch.
2. Replace the tires with Serenities or Comfort treads.
3. Change to 60 series tires.
4. Strongly consider a 225 or more width. Increases side wall height (remember spedo error) and fender well clearance.
5. Reduce the tire pressure with the new tires to 29/30
6. Install new suspension parts cited above.
7. Take a test drive.
8. Want still softer? look a anti swar bar adjustment of bushing.
9. Consider small diameter anti sway bar.
10. Still softer: Replace shock set in rear with a set that fits for: stroke, size etc but that is softer, take dimension to suspension shop or go on line and find a set.
11. Still softer, Wait for new after market springs, Be armed with coil diameter, number of active coils, Coil wire diameter, Material and take a picture of your old springs from above, Place a board on spring and set of weight or large drum and slowly fill with water to get spring rate. Water @ 8 pounds per gallon or 62.4 pounds per cu. ft. and calculate a deflection per pound graph. Good luck finding the right spring. Remember you want a longer initial free length so that car will ride at same height when the softer spring is loaded.
12. Then go live with it.

 

[Seattle Genesis]

Took my co-workers out to lunch today. Packed car with 4 of us....

They all said they wont ride in my car anymore. One said their tailbone hurt and one said his stomach felt like it was on spin dry cycle... ugh.

I guess I will be changing out my suspension sooner that later. Cant take this anymore. not my idea for a luxury car.

Seattle Genesis

 

[GripperDon]

Best $7 you can spend, Thanks REY !
Shocks changed, Rear anti sway bar Bracket changed ,,,,etc. etc.
http://genesisowners.com/hyundai-ge...Motors_Manuals_Literature?hash=item3caabf4e96.