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    Thread: Suspension spec thread

    1. Member Slave IV's Avatar
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      09-25-2012 09:51 PM #351
      Oh..you don't have the GC coilover kit either do you? Probably not the best idea to go with the exact same springs as ryeboy in that case. He did mention his setup seemed harsh until after about 500 miles though. Also, I know it's been mentioned but I think it's strange that GC recommends higher rates in the front when the OE setup seems to have higher rates in the rear. But that being said, it's also strange to me that the OEM has higher rates in the rear because OEM setups usually tend towards understeer and higher rates in the rear would reduce understeer. Maybe GC is giving you guys rates that work more closely to most OEM handling characteristics though?
      I wish it was easier to get confirmed numbers on this kinda thing for this car.
      If the numbers are correct for the oem spring rates, I'd want to keep that balance or go even stiffer for the rear springs but there are probably things I don't understand at play too.
      If your gas cap light comes on even if you think you tightened the cap, try pulling on the cap as you tighten it. Worked for me.
      Help us with suspension specs!
      Vag Evolution: MkI Rabbit -> MkII 16v GTI -> B5 S4/MkV .:R32

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      09-25-2012 10:39 PM #352
      This thread... it is now confusing the hell out of me... I'm out!

    3. Senior Member abeR's Avatar
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      09-25-2012 10:43 PM #353
      .
      WITW

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      09-25-2012 10:46 PM #354
      Lol Abe...

    5. Member SilverSquirrel's Avatar
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      09-25-2012 11:37 PM #355
      Quote Originally Posted by Slave IV View Post

      OEM has higher rates in the rear because OEM setups usually tend towards understeer and higher rates in the rear would reduce understeer.
      careful now.
      You cant go by just the spring rates. Remember, the motion ratios for the front and rear are different. The Front strut has the spring out close to the tire, while the rear multilink has the spring inboard, with the leverage of the lower arm increasing mechanical advantage on the spring... so the effective spring rate is much less in the rear than the front... Also, remember the weight up front is greater than the weight in the back....

      Im not going to get specific into the math and geometry, but now you are getting into motion ratios and wheel rates. Not just spring rates!

      but i agree, i dont understand the swap of high/low vs low/high.... and how it helps handling. Stiffer up front would reduce grip, and increase understeer. Possibly a stiffer RSB would be needed to keep the balance happy?
      Audi is the girl who was really cute in high school, but now puts on way too much makeup in order to try and hang out with the hot girls.

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      09-25-2012 11:54 PM #356
      Slave IV
      Oh..you don't have the GC coilover kit either do you?
      jedy617
      This thread... it is now confusing the hell out of me... I'm out!
      Sorry if my ramblings are confusing. In case anyone cares, abbreviated recap on my set up:

      * I was on stock springs and Koni FSDs - rear was 'OK', front springs felt like absolute mush
      * wanted to stay roughly stock ride height and increase spring stiffness a lot in the front, a little rear
      * Debated for a while between a GC kit and other options, finally tried GC coilover conversion kit
      * Ryeboy is only other MKV R32 owner I know of who has used a GC kit, and he likes his results
      * Ryeboy (Jay) is running Ohlins dampers, GC kit with 450lb 7" front, 350lb 10" rear springs
      * I asked GC if same springs as Jay with Koni FSDs should work and yield similar results, they said yes
      * Ordered GC kit for Konis, same springs as Jay, ended up 26.75" front 25.75" rear, and too stiff
      * will be trying 5" 425lb front, 9" 280lb rear springs (from GC) soon
      * Lessons learned so far:
      * ........Ohlins have removable perches, Koni's do not (can possibly be cut / ground off...)
      * ........Ohlins can handle stiff springs, Koni FSDs not so much (Koni Yellows / other options likely better)


      Does that help?

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      09-26-2012 02:28 AM #357
      Quote Originally Posted by motrrrpsycho View Post
      Sorry if my ramblings are confusing. In case anyone cares, abbreviated recap on my set up:

      * I was on stock springs and Koni FSDs - rear was 'OK', front springs felt like absolute mush
      * wanted to stay roughly stock ride height and increase spring stiffness a lot in the front, a little rear
      * Debated for a while between a GC kit and other options, finally tried GC coilover conversion kit
      * Ryeboy is only other MKV R32 owner I know of who has used a GC kit, and he likes his results
      * Ryeboy (Jay) is running Ohlins dampers, GC kit with 450lb 7" front, 350lb 10" rear springs
      * I asked GC if same springs as Jay with Koni FSDs should work and yield similar results, they said yes
      * Ordered GC kit for Konis, same springs as Jay, ended up 26.75" front 25.75" rear, and too stiff
      * will be trying 5" 425lb front, 9" 280lb rear springs (from GC) soon
      * Lessons learned so far:
      * ........Ohlins have removable perches, Koni's do not (can possibly be cut / ground off...)
      * ........Ohlins can handle stiff springs, Koni FSDs not so much (Koni Yellows / other options likely better)


      Does that help?
      Very much so haha my choices are much much simpler... either coilovers, springs, or FSD's with springs. Your whole setup seems somewhat complicated but I think that's just me haha

    8. Member Slave IV's Avatar
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      09-26-2012 02:19 PM #358
      motrrrpsycho, was your suspension stock before you switched to FSD with stock springs? If so, did the fronts also feel like "mush" before the switch?
      If your gas cap light comes on even if you think you tightened the cap, try pulling on the cap as you tighten it. Worked for me.
      Help us with suspension specs!
      Vag Evolution: MkI Rabbit -> MkII 16v GTI -> B5 S4/MkV .:R32

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      09-26-2012 07:02 PM #359
      My mod progression (chasis related) listing in "stages" of stuff I installed at close to the same time:

      0) Started with a bone stock .:R
      1) Haldex + switch, Neuspeed RSB, Autotech dogbone insert, 21 lb 18x8 wheels
      2) Passat aluminium LCAs + spindles, Koni FSDs
      3) RB 330 brake kit (also slightly lighter than stock Centric rear rotors)
      4) 17 lb 17x8 wheels, HPA dogbone, Tyrol subframe collar kit
      5) 034 trailing arm spherical bushings, GC coilover conversion kit at 450lb 7" front, 350lb 10" rear

      That's where I am right now, with a front ride height of 26.75 and rear at 25.75 both dialed full down.

      Question on front end mush - yes - definitely still an issue with the FSDs. The Konis were a great overall improvement and perform as advertised with tighter damping under steady corner load and much better than stock small bump absorption. I think my confidence level with the car, how hard I drive it, plus other mods make it hard to compare from memory now with / without FSDs, but the main problems (for me) are still front end dive under braking, front body roll and lack of ability to take big bumps - mainly mid corner. I will be putting on a new front air dam as soon as I get my springs sorted coz my original one is ground down to a little nub from dragging on the ground so much. The FSDs may have helped with those issues to a point but can not fix them by themselves - at least not on this particular car (given its front end weight and wimpy stock front springs). So I'm pretty sure stiffer springs will help. It's just turning out to be a bit of trial and error to get the right ones. Live and learn...

    10. Member Slave IV's Avatar
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      09-26-2012 07:40 PM #360
      A GB just started for the Ohlin TTX's that I mentioned I was going to get for my S4...how does that relate here? I mentioned some spring rates that PSi recommended and I immediately got a response from the distributor (034 in this case) about the rates they use on their Time Attack car and that all orders would be discussed with each specific buyer to determine the appropriate rates for them.

      Just a comparison with the headache some of us are dealing with here to even get the rates for an off the shelf system for this car.

      Basically, we need to let manufacturers and retailers of products for this car know that we actually care about the parts we put on our cars too and they can't just drop some marketing piece with a bunch of fluff and expect us to buy. Part of what I've been trying to do with threads like this since I showed up here. [/rant]

      Now, back to your regularly scheduled programming...
      If your gas cap light comes on even if you think you tightened the cap, try pulling on the cap as you tighten it. Worked for me.
      Help us with suspension specs!
      Vag Evolution: MkI Rabbit -> MkII 16v GTI -> B5 S4/MkV .:R32

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      09-29-2012 06:09 PM #361
      I called performance shock yesterday to ask about potentially grinding perches off and / or re-valving my FSDs. They gave me some helpful feedback and info that I thought I'd pass along in case it help anyone else considering FSDs and / or Ohlins R&T.

      They said with regard to the Ohlins, that they are basically way overpriced and really not all they are cracked up to be

      Just kidding - just kidding - just kidding - hehe... Just messin with Slave

      Back on a serious note, they said that they think very highly of the FSDs, that they are really the only thing out there that can come close to the Ohlins in terms of giving you both improved performance AND improved ride. Basically the only 2 options out there for dampers that can actually deliver on that promise - the Ohlins being better at it but (obviously) also cost a lot more, so for the money - the FSDs are pretty dang good.

      However, they also told me that they don't think the FSDs will be able to handle as heavy of spring weights as the Ohlins, and they do not rebuild or re-valve FSDs (would have to send them to Koni for that). They also said that while the FSDs compare well to the Ohlins (especially for the money) on the street, the difference is bigger on the track. They didn't actually say it this way - I'm just making up these numbers - but I got the impression they were saying FSDs might be 80% as good for the street but only 60% as good for track (something along those lines).

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      09-30-2012 11:37 AM #362
      Wonder what a good street spring rate for the FSD would be. Long time I looked into spring rates etc how big does the diff front rear need to be? There was something that otherwise you can get harmonic frequencies build up ( or so).

    13. Member SilverSquirrel's Avatar
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      09-30-2012 12:10 PM #363
      Quote Originally Posted by BlixaBargeld View Post
      Wonder what a good street spring rate for the FSD would be. Long time I looked into spring rates etc how big does the diff front rear need to be? There was something that otherwise you can get harmonic frequencies build up ( or so).
      FSD knowledge:

      http://www.golfmk6.com/forums/showth...t=32323&page=2
      Audi is the girl who was really cute in high school, but now puts on way too much makeup in order to try and hang out with the hot girls.

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      09-30-2012 01:34 PM #364
      Quote Originally Posted by SilverSquirrel View Post
      But not applicable to my question

    15. Member SilverSquirrel's Avatar
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      09-30-2012 01:43 PM #365
      Quote Originally Posted by BlixaBargeld View Post
      But not applicable to my question
      bottom line, FSD shocks are designed to work with stock spring rates at stock ride heights.
      Audi is the girl who was really cute in high school, but now puts on way too much makeup in order to try and hang out with the hot girls.

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      09-30-2012 02:53 PM #366
      SilverSquirrel - thanks for that link. The info re bump stop interactions with the FSDs (from someone at Koni no less) is really helpful.

      Yes, FSDs are designed to work with stock springs, but the Koni guy does not say to stay away from any other springs or ride heights. He says they work well with Eibach pro kit springs and others with "moderate" lowering.

      I'm staying close to stock ride height and will be looking at rather I need to cut bump stops now, but what the Koni guy said about how the FSDs cut rebound damping when they hit bump stops (when you would actually not want them to) makes me wonder if they will do the same thing with linear springs. Hm.....

    17. Member SilverSquirrel's Avatar
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      09-30-2012 03:23 PM #367
      Well, since a dyno plot shows us that damping force varies with frequency, and since frequency is a function of spring rate and vehicle mass, (not talking about how fast the car goes, but how fast the shock goes up and down), I would think a FREQUENCY SELECTIVE DAMPER aka FSD,would be even more sensitive to changes in spring rate and /or vehicle mass than a stock or other non FSD damper.

      The "sweet spot" where the FSD changes from soft to firm, on a given car, with a given spring rate, will change. better? worse? who knows. not me.



      What happens when you put a shock designed for a 3000 lb car, with a 180 lb/in spring, on to a 4000 lb car with a 300 lb/in spring?


      Last edited by SilverSquirrel; 09-30-2012 at 03:28 PM.
      Audi is the girl who was really cute in high school, but now puts on way too much makeup in order to try and hang out with the hot girls.

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      09-30-2012 06:03 PM #368
      Quote Originally Posted by SilverSquirrel View Post
      Well, since a dyno plot shows us that damping force varies with frequency, and since frequency is a function of spring rate and vehicle mass, (not talking about how fast the car goes, but how fast the shock goes up and down), I would think a FREQUENCY SELECTIVE DAMPER aka FSD,would be even more sensitive to changes in spring rate and /or vehicle mass than a stock or other non FSD damper.

      The "sweet spot" where the FSD changes from soft to firm, on a given car, with a given spring rate, will change. better? worse? who knows. not me.



      What happens when you put a shock designed for a 3000 lb car, with a 180 lb/in spring, on to a 4000 lb car with a 300 lb/in spring?


      Hmmm not sure if you understand the " sweet" spot is different from what you think it is. Short bumps will always the same. And the " designed for xxx" is to a certain degree just legal blabla
      For the GTI they were reviewed favorably with DG springs ( yes I know diff weight of car, dampers, ....).
      Ok what would be a good guesstimate for FSD and street? 350/250? As my car didn't gain 1000lbs overnight

    19. Member SilverSquirrel's Avatar
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      09-30-2012 08:13 PM #369
      Sorry BLix... I was directing that last at Motorpsycho.

      Interesting to learn from a previous post a page back that
      Koni makes different FSD for regular mkv vs r32.
      Why would they do a crazy thing like that?

      compared to a mkv gti, the r32 is 400+ lbs heavier, about 13% fatter! So FSD for say, GTI, will be 13% less damped (bouncier)
      Also, stock r32 springs are 20 to 35% stiffer than GTI, meaning the damping force of the FSD will be that much more inadequate, making the suspension even further underdamped COMPARED TO THE GTI, WHICH THE FSD WAS DESIGNED FOR. This will make the ride soft and bouncy, and not as smooth.

      About the sweet spot comment:
      Think about this: Stiffer springs will make the suspension travel less given the same bump at the same speed for the same car. right? But the bump takes the same time to go over in either case. velocity=distance/time, Therefore the velocity seen by the FSD could be seen as "low speed" where as before you changed springs, the shock thought it was getting a "high speed" bump, and opening the FSD valve to soften up. Now, it keeps the valve closed, and you experience a hard hit, and then the car pogos up and down because the damping is inadequate, where if you kept stock springs, it would have soaked the bump up and kept rollin down the road.

      My point is, much like the bump stop issue (see link to MKVI forum above) with regard to FSD's working correctly, I think they would be sensitive to changes in spring rate, and car weight, MORE SO than other "normal" shocks. And this is on top of the problem of a shock not being valved correctly for a specific spring, car weight, and intended use!


      Im just puzzle piecing this stuff together from reading this thread, and others, and some googling on suspension math.
      Audi is the girl who was really cute in high school, but now puts on way too much makeup in order to try and hang out with the hot girls.

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      10-01-2012 12:31 AM #370
      Good stuff, guys. Coincidentally I just discovered today while looking at shocks on tirerack.com that several PN's are the same between MKV GTI & MKV R32. I thought this seemed odd, so looked them up on Koni's web site. While TR lists same PNs between GTI and R32, both Koni sports (yellows) and FSDs show different PNs on the Koni site. I dug up my paperwork from when I got FSDs installed and guess which ones I have... The GTI PN. F**King awesome.

      SilverSquirrel - your thoughts do seem to make a lot of sense. I'll be calling Koni first thing in the AM.

      I'm supposed to be dropping my car off @ 9 AM to get my 2nd set of GC springs installed. Same shop that ordered the FSDs and installed the for me. If they bought them from TR or somewhere else that listed the GTI PN for the R32, then its not the shops fault, but hopefully they can get whoever they ordered from to take some responsibility for sending the wrong ones. Makes me wonder now what the CORRECT FSDs for the .:R would feel like - even with stock springs.

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      10-01-2012 07:53 AM #371
      That the FSD and other Konis were sold as " for R32" isn't good business practice. Someone ordered the STR ( or what the basic line is called). And that the GTI shocks were sold to R32 owners it even tougher to understand ( as here there are two part numbers).

      Koni step up!

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      10-01-2012 01:21 PM #372
      Got results from Mike at TyrolSport today on spring rates for the VR6 A3. The only other bit of data beyond the measurements from this and my previous post is that the Euro springs lowered the front of my car by about 5/8" and kept the rear at the same ride height.

      In round numbers:

      S-Line F = 180 lb/in
      Euro F = 280 lb/in

      S-Line R = 250 lb/in
      Euro R = 330 lb/in

      A VR6 AWD w/ lots of goodies

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      10-01-2012 02:58 PM #373
      Hmm and as the FSD are probably designed for the Euro springs .....

      Too much guesswork for me as I have little real knowledge on this issue and if I would try couldn't expect to improve it ( no track no experience to translate driving feel into technical changes).

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      10-02-2012 02:37 PM #374
      Got some more info and news to share. I talked with Lee G. @ Koni and he tells me that the different PN for the FSDs for R32 only came out about a year ago and is only very slightly different. He said the fronts are still the exact same PN, only the rears are different. For the rears, the body is 10mm different (I think he said longer, but can't remember for sure now) and that it had slightly different dampening. He said if you already have the older PN to not worry about it - it was not a significant difference and certainly not worth the cost / effort to replace.

      As for ride height and spring questions, he basically re-iterated what he was quoted as saying in that other thread - stay off the bump stops and you should be fine. I asked if he thought linear springs that are stiffer rates than stock should be OK. He said linear vs progressive does not matter, and somewhat stiffer and/or lower is fine. He said that because they are not manually rebound adjustable, you should not go -too- much stiffer than stock - if so, get yellows. Or if you are lowering to the point where you can't avoid some bump stop contact - get yellows. Otherwise FSDs are fine.

      A note on yellows: Lee mentioned that while the different PNs between GTI and R32 are not significantly different for the FSDs, he said the difference for yellows IS significant, so if anyone is thinking of getting yellows, make sure you get the R32 PN from the Koni site before you order. A lot of the sites out there may still list the same PN for both GTI and R32.

      As for my set up with the Ground Control kit - GC insisted that the 5" long front springs would work for me and that I would not have an issue with travel. Maybe they work for the GTI, I don't know, but for me - first corner I took at an even semi quick pace and hit a bump - I slammed in to the bump stops hard and just as Koni described, the FSDs don't try to resist the rebound force so I bounced up and down 3 or 4 times off the bump stops from (I think) just one bump in the road. I could try cutting my bump stops, sure, but as easily and as hard as I hit them, I can't imagine I will recover enough travel unless completely removing them which can obviously kill the shocks, sooo yeah. I'm screwed. Not sure what to do next, but lesson learned - do NOT try to use a GC kit with Konis or any other shock with welded on perches UNLESS you know going in that you will have to cut / grind the perches off. Now I either have to do that, buy Ohlins or try to get GC to take the kit back and do something else all together.

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      10-02-2012 03:44 PM #375
      That blows . All this work for nothing.

      But I remember the diff PN are older than 1 year. There was change to the FSD in the beginning (high pressure > low pressure or so) as the early FSD seemed to have lifted the vehicle.

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