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Old 08-17-2015, 10:36 PM   #1
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Default New FM suspension offering

<p>https://www.flyinmiata.com/fox-suspe...a-chassis.html</p><p>Just found out about this. Sounds pretty cool. Interested in back to backs with other competitors.</p>
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Old 08-18-2015, 11:00 AM   #2
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Who's gonna do back to back testing against Xidas?
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Old 08-18-2015, 11:06 AM   #3
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Pretty cool. Love me some competition
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Old 08-18-2015, 02:06 PM   #4
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Who's gonna do back to back testing against Xidas?
buy me some fox's and I'll do it.
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Old 08-18-2015, 03:05 PM   #5
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<p>Does anyone know if these are&nbsp;aluminum body or steel shocks?</p>
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Old 08-18-2015, 03:12 PM   #6
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<p>Does anyone know if these are&nbsp;aluminum body or steel shocks?</p>
Anodized, so aluminum.
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Old 08-20-2015, 12:16 AM   #7
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Who's gonna do back to back testing against Xidas?
On the street, with soft springs in comfort mode, I suspect we'll be pretty equal. On the track however, the Fox dyno plot shows about 60% less compression damping at 3 in/sec regardless of damping setting. Compression doesn't change on the Fox, just rebound. That's about equivalent to our settings 14-20 (of 1-20) on the Xida. The Xidas can be adjusted for far stiffer on low speed compression and that's needed for modern 200tw EHP or race tires. The Fox are single digressive. Xida are double digressive. That little feature allows the Xida driver to tune in a low speed compression nose which is particularly useful in autocross.

On the rebound side, the Fox digression starts at about 4 in/sec in the middle settings. Perhaps that's a conscious tuning decision or just the limitations of the hardware. On a car at least, you want that rebound digression to start right off the bat, at 1 in/sec. No later than 3 in/sec though as that's sort of the threshold for driver induced suspension movements. To accomplish that without a bunch of hysteresis is difficult. Managed quite well in the Xidas, as evidenced by the ride quality testimonials you read everywhere.

It's interesting that the lamented AFCO's had a better rebound curve here, but inferior internals to the FOX. I'm sure the FOX works better overall despite that less optimized digression curve.

So as a street only kit, I think the Fox represents a great value. An excellent option if the Xidas are out of reach. What the xidas offer, from what I can see on the published dyno plots, is a entire additional level of performance for competitive or HPDE use that the Fox aren't apparently designed for.


Also the $207 helper spring kit on the Fox seems to be a near zero rate tender. Not a high rate helper like the $260 option on the Xidas. The Fox bearing is a molded plastic collar, not a stainless Torrington need roller bearing on the Xida. So not apples to apples .

Last edited by emilio700; 07-12-2017 at 03:02 PM.
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Old 08-20-2015, 01:19 AM   #8
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Emilio, are you comparing single adjustable Xidas or double adjustables to the Foxes? I think there is quite a difference in price from singles to doubles.
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Old 08-20-2015, 01:35 AM   #9
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Emilio, are you comparing single adjustable Xidas or double adjustables to the Foxes? I think there is quite a difference in price from singles to doubles.
Singles to singles of course. That post would be quite disingenuous otherwise wouldn't it.

Our singles adjust compression a bit in step with rebound. Somewhat unique in that regard.
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Old 08-20-2015, 01:36 AM   #10
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<p>Thank you for the insight emilio.</p>
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Old 08-20-2015, 01:42 AM   #11
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disingenuous
</p><p>That's an interesting word to use. When I first read it I saw it as the opposite of ingenuous, but then I realized it was the opposite of ingenuous, which is another seldom used word. In fact I don't think I've ever heard the word ingenuous before.</p><p>Have you always worked on cars? Possibly an english degree in your past? </p>
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Old 08-20-2015, 02:25 AM   #12
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You've not heard ingenious before? I'm an ingenious

I've been modeling all the popular suspension packages in a racing simulator recently, because very scientific, anyway I really want Xidas after all I've tested.

Still need to do these and the feals though, as that seems a bit more apples-apples. I haven't seen a plot of the cheaper street set yet, I wonder how they compare?
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Old 08-20-2015, 02:28 AM   #13
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<p>See you're wrong there. I have heard of ingenious before, but not ingenuous. 2 different words.</p>
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Old 08-20-2015, 02:33 AM   #14
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Ha, nope. Just an avid reader at an early age. My oldest sister taught me to read before I began 1st grade. Within 6 weeks I read through the entire curriculum and got bumped a grade. So yeah, I like words
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Old 08-20-2015, 02:34 AM   #15
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<p>I too like words, but I always find it to be more effort to use big fun ones. I'm short and to the point, my brain always works faster than I can type. :/</p>
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Old 08-20-2015, 02:36 AM   #16
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The people I deal with on a regular basis look at me funny if I use big words, so I don't use big words.

I super love the right click "search google for..." option though, I should use it more lol
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Old 08-20-2015, 02:37 AM   #17
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<p>Lol, the people I deal with look at me funny when I talk like a redneck. I should start making more of an effort.</p>
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