normality78 Posted September 17, 2011 Share Posted September 17, 2011 Well i supposed to give some review but unfortunate thing do happen. My workshop happen to damaged one of my HD strut http://a1.sphotos.ak.fbcdn.net/hphotos-ak-snc7/317521_10150314997303089_693408088_8020200_1937250405_n.jpg so now i'm on front stock damper with H&R spring and rear with B6 (HD) on H&R spring. So following review might not be accurate. Stance, Well it does drop it alright. I measure from front fender till center wheel nut. I figure this will be the most accurate way to measure as everyone finger was different size and some could be using different height tyre. Front from fender till center nut was 350mm and rear was 365mm. If to go buy finger tight, front 2 rear 2 finger with some gap stiffness, as i mentioned, im using stock shock on front now. hence it is smooth silk. I deliberately go over some speed hump, It is obvious front shock was soft but on rear, i do notice it is slightly better (softer) then STI with B6 (HD). So not until i get my front fitted with B6 again, else this review won't be complete. I may not even get B6 anymore as i feel good on current now. Just that stock kyb tad too soft so either go for Spec.B bilstein or B4 Link to comment Share on other sites More sharing options...
BAC5.2 Posted September 18, 2011 Share Posted September 18, 2011 This is great info. Really wish we could see the collapsed/extended lengths on the factory Spec B (Rev C) Bilsteins. It's been mentioned before, that the HDs have a shorter rod length so that information would be helpful to confirm. I have Spec B (Rev C) Bilstein struts with Swift wagon springs. Like this combination, but for reasons mentioned above, mostly under-dampening (not nearly as under-dampened as the stock KYB/Spring combo) but, over time, have come to realize that the Rev Cs are just a bit too soft in that area. One thing I noticed right away with the Rev Cs is that the car would hobby-horse (rock back and forth) horribly. To fix this, I did the Bilstein bump-stop mod which helped considerably. I also did the LCA bushings and the Roll Center Bump Steer kit as well because of the huge gain in static camber from the Swift drop. If you are on lowering springs, that drop you more than 3/4", I'd recommend doing the bump-stop mod to regain additional suspension travel without the incidental loading/unloading from the bump-stops. If you're dropped more than an inch, I'd recommend the RCBS Kit. So, I've bought a set of HDs which I'm getting ready to install with the Swifts and a set of 3/8" butt spacers at the rear. Will be using the RCE bump stops in place of the cut-down Bilstein stoppers. Will post up my results once I get them installed. Do plan to send the Rev Cs to Bilstein in Poway, CA and have them re-valved to Sport settings for another application, so will also post up how that goes. I thought it was debunked that the HD's had shorter stroke than the other struts. They have the same stroke as the stock Spec-B Bilsteins. After switching to Pinks on my HD's, I've noticed the ride is a little more firm, but somewhat better damped than before. I definitely like it, so I'm happy I did the swap. [URL="http://legacygt.com/forums/showthread.php/proper-flip-key-interesti-159894.html"]Flip Key Development Thread[/URL] "Genius may have its limitations, but stupidity is not thus handicapped." - E. Hubbard Link to comment Share on other sites More sharing options...
T-Rexky Posted September 18, 2011 Author Share Posted September 18, 2011 I thought it was debunked that the HD's had shorter stroke than the other struts. They have the same stroke as the stock Spec-B Bilsteins. After switching to Pinks on my HD's, I've noticed the ride is a little more firm, but somewhat better damped than before. I definitely like it, so I'm happy I did the swap. I asked Bilstein this very question but curiously never received an answer. I asked the same person that supplied all the data that I attached in the first post. Regarding the bump stop mod I can add that with the pinks and the stock Spec.B Bilsteins I was frequently hitting the bump stops with high speed compression (we seem to have lots of 'speed bumps' on the highways here). This completely disappeared with the HDs. To my liking this suspension setup is nearly perfect, but unfortunately it highlights how pitifully inadequate the tires are under the extremes. I am planning to go to new wheels and 235mm tires next spring to fix that. Link to comment Share on other sites More sharing options...
Norm Peterson Posted September 18, 2011 Share Posted September 18, 2011 The harshness is the struts, not the springs. I had coilovers with springs that are more than twice as stiff than Pink springs, but were as comfortable as stock. That's precisely why I'd like to see some damping numbers down in the body inertia motion range. At 0.52 m/s you're well above the range of interest for handling and spring control, and how it gets from 0.0 m/s to there matters a great deal. Norm Link to comment Share on other sites More sharing options...
westu37 Posted March 23, 2012 Share Posted March 23, 2012 sorry to resurrect a dead thread, but have any of you used stock spec-b springs with the hd's? I got a set of stock spec-b springs for my hd's, but after doing some more reading, I may want to do firmer springs.... Well anyway, I will be a gunnea-pig for us Outback owners... Wes. Link to comment Share on other sites More sharing options...
ebpda9 Posted March 24, 2012 Share Posted March 24, 2012 Hm... this is quite contradict with my experience on HD pair with Pinks which im currently having it. I felt it is hard and bouncy. The only thing i'm not sure is which "type" of sti spring that i have and i don't even know there are different version of it. But i do have B6 for sure. So im not sure if it is the spring too hard or the HD. Also i don't think my sti spring is progressive type http://a5.sphotos.ak.fbcdn.net/hphotos-ak-ash4/218150_10150172983633089_693408088_6783744_1004769_n.jpg I had the same setup and hated it. finally upgraded to konis and it's a lot better provided that you cut the bump stops Link to comment Share on other sites More sharing options...
Zac88 Posted March 26, 2012 Share Posted March 26, 2012 Can I run Bilstein HD's with my stock 05 LGT wagon springs? Link to comment Share on other sites More sharing options...
cusco-awd Posted March 26, 2012 Share Posted March 26, 2012 Yeah, it's gonna sit higher in the front. Link to comment Share on other sites More sharing options...
Zac88 Posted March 27, 2012 Share Posted March 27, 2012 Yeah, it's gonna sit higher in the front. so I'll need specB springs then? Link to comment Share on other sites More sharing options...
Hugo L. Posted April 12, 2012 Share Posted April 12, 2012 I have JDM Spec B Rev. C Bilsteins, apparently the stiffest «stock» ones available. I wonder how they compare to HDs. Link to comment Share on other sites More sharing options...
Drogos Posted April 18, 2012 Share Posted April 18, 2012 I have JDM Spec B Rev. C Bilsteins, apparently the stiffest «stock» ones available. I wonder how they compare to HDs. Yeh, I am interested too if someone could chime in Link to comment Share on other sites More sharing options...
Heticor Posted May 3, 2013 Share Posted May 3, 2013 this is old thread, but nobody answer, I am interested in HD with spec B sprint. I would like to know to which resivision is closer the HD. thanks Link to comment Share on other sites More sharing options...
thestory8 Posted April 10, 2017 Share Posted April 10, 2017 My struts are dead and I'm looking to get new Bilstein's On tire-rack they have 2 options Bilstein HD B6 & Bilstein B8 Under the B6 it's showing that Spec.B top hats are needed but under the B8 it doesn't show that SpecB top hats are needed. https://www.tirerack.com/suspension/Susptabl.jsp?autoMake=Subaru&autoModel=Legacy+Wagon+2.5+GT&autoYear=2005&autoModClar=Base+Model I called them to see if maybe this was just overlooked but they told me that no the B8 would just used the stock top hat I'm having a hard time trusting them on this.. Also does anyone run the B8? Would you recommend them over the B6? Im on H&R springs Thanks! -Erik Link to comment Share on other sites More sharing options...
98legwag Posted April 11, 2017 Share Posted April 11, 2017 From what I have read the B6 and B8 are similar but the B6 was designed for use with stock height springs and the B8 for use with lowering springs. Link to comment Share on other sites More sharing options...
thestory8 Posted April 12, 2017 Share Posted April 12, 2017 From what I have read the B6 and B8 are similar but the B6 was designed for use with stock height springs and the B8 for use with lowering springs. Yes from what I can find that is true. But I'm trying to figure out why the B6 needs spec.B top hats and the B8 is said to use stock top hats I would also like to know if the B8's are worth the extra $240 over the B6's Link to comment Share on other sites More sharing options...
Dispatch20 Posted April 13, 2017 Share Posted April 13, 2017 Yes from what I can find that is true. But I'm trying to figure out why the B6 needs spec.B top hats and the B8 is said to use stock top hats I would also like to know if the B8's are worth the extra $240 over the B6's Ajusa.com had the B8s for less ($185 each shipped) than the B6s. They seem to have the least expensive Bilsteins. Ajusa says both B6 and B8 need spec B front tophats. I'm not aware of anybody that has bought the B8s yet, but I'd bet money they also require spec B hats. Sent from my SAMSUNG-SM-G890A using Tapatalk Link to comment Share on other sites More sharing options...
Dispatch20 Posted April 13, 2017 Share Posted April 13, 2017 Bilstein has great customer service. I bet they would give you a quick answer on the B8 tophats. Sent from my SAMSUNG-SM-G890A using Tapatalk Link to comment Share on other sites More sharing options...
thestory8 Posted April 17, 2017 Share Posted April 17, 2017 Just got an email back... Hello, Thank you for your inquiry. I checked with my hardware support team, and they said that all non-Spec B must convert to the Spec B upper mounts. We will be updating our website to reflect that information. Best regards, Skip Link to comment Share on other sites More sharing options...
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