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Old 03-08-2012, 11:05 AM   #41
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Yea, I agree Joe. But ultimately the shock body length will determine the maximum ride height with a specific tophat. Makes sense though. Do we know if NB Bilstein sports are the same size as the MSM Bilsteins?

I also wondering are the NA Bilstein HDs the same on the miata as the OTS ones?

Anyways, Seems like you should be in the clear for lower than my estimates Urban, assuming the NB Sports are the same size as the MSM Bilsteins.
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Old 05-01-2012, 04:11 PM   #42
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Hey Urban,
When you get done, could you post up your complete set up and your impressions of the final suspension?

I'm on a '93 LE with OEM Bilsteins, FCM bumps and mounts and I'm riding lower than I want.

Thanks,
Jim
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Old 05-06-2012, 01:21 AM   #43
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Shocks will be here on Monday most probably. Here are dyno charts for my set
Attached Files
File Type: pdf Slava Yanson, Miata SDX (5ips), 5-3-12.pdf (61.0 KB, 241 views)
File Type: pdf Slava Yanson, Miata SDX (10ips), 5-3-12.pdf (59.7 KB, 285 views)
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Old 05-06-2012, 06:47 PM   #44
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Quote:
Originally Posted by Joe Perez View Post
And yes, I can attest to the limited suspension travel. I've got a set of FM springs on Bilsteins with FCM bumpstops and NB tophats, and at rest, you can see with the eye just how little "free" travel there is. And that's after I lathed up about 3/4" worth of spacers to raise the lower spring perch up beyond the highest "stock" ring.

A question for the ISC tophat crew- at what point, assuming a damper with a body equal in length to (or perhaps slightly shorter than) an NA-style Bilstein, do you start to run the risk of creating so much free travel that things other than the bumpstop start becoming travel-limiting components? (eg, hard things crashing into one another?)
I have ISC 1.5 inch top hats on the rear with NA Billies and haven't had any contact issues. I did use a small spacer in the front with the 1 inch top hat.
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Old 05-06-2012, 10:26 PM   #45
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I apologize if you covered this earlier (I glanced back through the thread but didn't see it) but what spring rate did you go with? Is this primarily for street use?
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Old 05-06-2012, 10:54 PM   #46
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Hey Urban,
I can't tell how bad the bushings are on your bilsteins, but you can get new ones direct from bilstein customer support for pretty cheap.

Mine were pretty worn out, so it was a good thing.
Jim
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Old 05-07-2012, 05:08 AM   #47
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Originally Posted by arga View Post
I apologize if you covered this earlier (I glanced back through the thread but didn't see it) but what spring rate did you go with? Is this primarily for street use?
550/400 and it's my daily driver. It's going to be interesting to drive with these spring rates every day.


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Hey Urban,
I can't tell how bad the bushings are on your bilsteins, but you can get new ones direct from bilstein customer support for pretty cheap.

Mine were pretty worn out, so it was a good thing.
Jim
Yeah, I'm just waiting until shocks get here. Shopping for top hats right now.
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Old 05-07-2012, 01:48 PM   #48
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Quote:
Originally Posted by UrbanSoot View Post
550/400 and it's my daily driver. It's going to be interesting to drive with these spring rates every day.



Yeah, I'm just waiting until shocks get here. Shopping for top hats right now.
I drive 550/350s on stiff valved Konis every day. It's stiff, but not coal cart stiff.
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Old 05-07-2012, 03:36 PM   #49
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Are bilstain shocks like a chinese knock off? Like starbox is to starbucks?
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Old 05-07-2012, 03:39 PM   #50
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You still ended up getting the QA1 springs correct?
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Old 05-08-2012, 01:50 AM   #51
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Quote:
Originally Posted by falcon View Post
Are bilstain shocks like a chinese knock off? Like starbox is to starbucks?
Original thread was created on my phone which does not have spell check enabled for web browser.


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You still ended up getting the QA1 springs correct?
Nope, ended up getting Summit Racing branded springs since QA1 were not available in 400's at the time of purchase. Decided to stick with same brand springs on all corners and I've also heard that QA1 is the company making these springs for SR.


PS: shocks are here! Planning to get those installed during this week. Decided to try running on OEM NB top hats for the time being. Will change those out for something else if there is not enough shock travel.
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Old 05-08-2012, 04:28 PM   #52
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Very interested in hearing how these ride. I've been trying to do as much research on shock profiling as I can but what few rules I can find (65% critical damping at 3in/sec; 50/50 bump-rebound) nobody seems to follow. All my info is old though, well before digressive shocks.

Yours are for the street though so that's a completely different requirement.

Thanks for posting all this.
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Old 05-08-2012, 05:14 PM   #53
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Quote:
Originally Posted by arga View Post
Very interested in hearing how these ride. I've been trying to do as much research on shock profiling as I can but what few rules I can find (65% critical damping at 3in/sec; 50/50 bump-rebound) nobody seems to follow. All my info is old though, well before digressive shocks.

Yours are for the street though so that's a completely different requirement.

Thanks for posting all this.
I really don't need custom revalved shocks on the street These were built so I can drive my car the whole week and then take it to a race track on the weekend and kick some butt.
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Old 05-08-2012, 05:50 PM   #54
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Well don't think I'm bashing your valving choices. They're more in-line with Xidas and AFCOS than my out of date theories. I'd just like to know why everyone runs so much more rebound than bump.
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Old 05-08-2012, 06:02 PM   #55
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Quote:
Originally Posted by arga View Post
Well don't think I'm bashing your valving choices. They're more in-line with Xidas and AFCOS than my out of date theories. I'd just like to know why everyone runs so much more rebound than bump.
It really comes down to personal preferences and driving style
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Old 05-10-2012, 03:53 AM   #56
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It's in! Have to set proper ride height and align it tomorrow. Drove the car back home from the shop and was extremely surprised at how much smoother the car is now even with 550/400 rates. I really like the way this valving feels. Will post a proper review after some spirited canyon driving and a track day.

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Old 05-10-2012, 11:11 PM   #57
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I'm running 550/350 on my SD Billies and sure it's stiff but rides surprisingly good. You can feel the stiffness on washboard roads but it's very livable.
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Old 05-11-2012, 12:09 AM   #58
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Temporary ride height and alignment done. So far I'm extremely impressed.

PS: ride height adjustability is somewhat limited with OEM top hats but I was able to get very close to what I originally wanted to set the height at, even though I'm all the way down on threads on all corners. There is still a somewhat reasonable amount of shock travel left but I'd like to see a bit more.
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Old 05-11-2012, 11:20 AM   #59
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What height are at the pinch welds?
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Old 05-12-2012, 04:01 PM   #60
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Quote:
Originally Posted by adamvanxxx View Post
What height are at the pinch welds?
Not sure. I just set it up by eye for the time being. Proper height will be set when I go for corner weighting.

Here is a dilema - I'm pretty much all the way down on all corners and if I drive over a small ditch on the road my rear springs get some slack and slam into top hat upon compression. It makes a bit of noise when that happens but otherwise it seems fine. Should I be worried about that?
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