New FM suspension offering
08-17-2015, 09:36 PM
#1
SADFab Destructive Testing Engineer
Thread Starter
iTrader: (5)
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 18,642
Total Cats: 1,866
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>
Reply
0
0
08-19-2015, 11:16 PM
#7
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 .
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 02:02 PM.
Reply
0
0
08-20-2015, 12:42 AM
#11
SADFab Destructive Testing Engineer
Thread Starter
iTrader: (5)
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 18,642
Total Cats: 1,866
<p></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>
</p>
Reply
0
0
08-20-2015, 01:25 AM
#12
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?
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?
Reply
0
0
08-20-2015, 01:34 AM
#15
SADFab Destructive Testing Engineer
Thread Starter
iTrader: (5)
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 18,642
Total Cats: 1,866
<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>
Reply
0
0
Thread
Thread Starter
Forum
Replies
Last Post
bigmackloud
Miata parts for sale/trade
19
01-08-2021 11:24 AM
stoves
Suspension, Brakes, Drivetrain
5
04-21-2016 03:00 PM
