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Old 12-05-2008, 10:58 PM   #41
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Keith is right. What I add below is less important than any of the points he made.

In both lateral and longitudinal weight transfer, there is actually a slight increase with greater dive or roll angle, due to the CG of the vehicle shifting relative to the pitch or roll center. But it's typically a small fraction of a percent and can safely be ignored in any internet arguments about setup.

Before dive has occurred, the car can't transfer weight through the springs, because they are position-sensitive devices. Low-speed compression (and bump) valving can affect the rate at which weight is transferred, because they are speed-sensitive devices and can move the force on the contact patches before the car has been able to reach the steady-state compression of the springs for the decel level it will ultimately achieve. I have seen instances of excess rebound damping on the rear causing the car to get really loose on braking. Dialing out the rebound made everything peachy.


BTW, Keith, any chance you could reproduce the data on your site regarding Miata prop valves for a range of settings on the Wilwood valve? I've been looking for that for years, and even friends at Wilwood have failed to provide it. Assuming the spring is linear, all you'd really need to completely characterize the valve is the knee point at the minimum and maximum settings, and the post-knee point slope. Multiple readings around the knee point to be sure hysteresis is accounted for would be a nice bonus.
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Old 12-06-2008, 02:04 AM   #42
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The data on the stock valves was not obtained by testing, but by research. They're printed in the factory manuals I don't have a test setup at hand that will give me the knee points of a valve.

However, Wilwood claims that their valve adjusts from 57% to 100%. When you adjust it, you're basically just moving the knee point. So from this we should be able to deduce that at wide open (100%), there is no knee point. At full close, the knee point is essentially at the origin so you have the post-knee slope of 57%.
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Old 12-06-2008, 04:43 PM   #43
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Originally Posted by [email protected] View Post
If you want to install the valve in the cockpit but don't want to flare, we can help put together a kit that will do that and will also be reversible. Bending and supporting the lines (very important, that last one!) will be up to you though.
What the hell Keith, two weeks too late! (yes, after sending you those pictures, it took me this long to actually plumb the damn thing)

Hustler if you don't want wait for FM to put a kit together (unless they already have?) I'll let you borrow my flaring tool. just pay postage from 97045, its probably about 3-4lbs.
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Old 12-06-2008, 07:06 PM   #44
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Actually, flaring tools are the sort of thing you can rent/borrow from local auto parts stores, usually for free. However, I've found that you usually get your moneys worth. It's important to prep the line well (a nice square cut, preferably with a pipe cutter and knock the edges down), but at least two of those cheap tools have broken in half on me. I only own three Snap-On tools, but my flaring tool was the first one I bought. In case you're wondering, the other two are some flare nut wrenches (cheap ones will expand and slip under pressure) and a ratcheting crimping tool...

When I think about it, the "kit" would simply be two metric unions and the two metric-NPT adapters. So basically our Wilwood kit plus one extra union. You can buy the piece of metric brake line you'd need from your local auto parts store in a length that suits you. So we've had the "kit" available for months and months
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Old 12-07-2008, 09:10 PM   #45
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I'm waiting on my speed bleeders to see how my standard/metric mix of lines even seals. I didn't have a pipe cutter either, so hopefully I can cut as straight as my eyes say I can.
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Old 12-07-2008, 11:02 PM   #46
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You can usually spot a bad flare by eye, it'll be asymmetrical. It's possible to do them well without a pipe cutter, but harder.
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Old 12-12-2008, 12:01 PM   #47
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So what do I need to do in order to get in on this group-buy?
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Old 12-12-2008, 12:07 PM   #48
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Call us and tell us you're part of the group buy.
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Old 12-12-2008, 07:55 PM   #49
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keith you need to keep your instructions simple for hustler, "call us and tell us you're part of the group buy" is much too complicated
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Old 12-13-2008, 05:40 PM   #50
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Quote:
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keith you need to keep your instructions simple for hustler, "call us and tell us you're part of the group buy" is much too complicated
the jerk store called, they're running out of you.
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Old 12-13-2008, 06:22 PM   #51
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jerk? geez, apparently finally having a turbo miata makes people soft
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Old 12-17-2008, 12:03 PM   #52
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Call us and tell us you're part of the group buy.

Jason told me no special price, as there's not 10 orders yet

so get ordering guys, I need this
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Old 12-17-2008, 12:53 PM   #53
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Im in.
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Old 12-17-2008, 02:21 PM   #54
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We just need two more to commit, then we can start taking orders.
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Old 12-18-2008, 12:20 PM   #55
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Here's the list as I see it:

cjernigan
Rafa
Oscar
DragonsMaw (retracted?)
UrbanSoot
ray_sir_6
ScottFW
levnubhin
Hustler
leatherface24

That's 10 if DragonsMaw is in, but it looked like he was on the fence.
Come on y'all.
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Old 12-23-2008, 12:15 PM   #56
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If anyone else wants in, add your name now. We have a couple guys ready to place orders and they are waiting on you!
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Old 12-27-2008, 12:58 AM   #57
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so do I need to call them again or are we still waiting? I have a track day in 2-weeks. I'd like to get my **** together so I can rape and spit on rich people.
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Old 12-27-2008, 06:37 AM   #58
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What the hell, I'm in for sure. Only question is if we can get some made for cockpit mounting? Even if this is only for installation in the engine bay I'll take it.
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Old 12-27-2008, 11:52 AM   #59
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great, that's 10
I'll give Jason another shout for the discount now
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Old 12-27-2008, 12:24 PM   #60
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Quote:
Originally Posted by DragonsMaw View Post
What the hell, I'm in for sure. Only question is if we can get some made for cockpit mounting? Even if this is only for installation in the engine bay I'll take it.
you can mount that one wherever you want.
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