Fast Suspension's 3-Way Yari Damper Upgrade - Eurobike 2017
Fast Suspension has been working on a plug and play damper to replace Motion Control damper units in RockShox Yari and Revelation forks. Why only these two models? Fabien Glatre, owner and engineer at Fast says that the Yari is becoming one of the most popular forks at the moment due to the huge numbers specced on eMTB's. He thinks the Yari has a great chassis but is let down by the damping performance of the Motion Control system, especially on heavier eMTB's which have much more sprung weight and blow through the mid-stroke too easily. Most riders try to overcome this by adding more volume spacers, but a better solution is said to be to add more compression support in the mid-stroke. This new cartridge gives independent control over three phases of compression damping: low, medium, and high.
Riders can externally adjust compression for low (0-150 millimeters per second) shaft speeds and medium (150-700 millimeters per second) speeds using the purple and black adjusters. High-speed (anything over 700mm/s) can be adjusted internally by switching shims in the lower valve and can be done by the consumer.
The unit will employ nitrogen filled, closed cell foam which will work as a compensator, and turns the damper from an emulsion type system into a closed cartridge type by sealing against the stanchion wall.
The unit will employ nitrogen filled, closed cell foam which will work as a compensator, and turns the damper from an emulsion type system into a closed cartridge type by sealing against the stanchion wall.
Riders can switch shims themselves in the lower part of the cartridge to adjust high-speed compression.
The units will cost €259 and be available in October, along with a series of instructional videos that help riders get the best setup from their on-trail feelings.
Fast also have some new upgrades for their Holy Grail shock. There is a new compression lever that either leaves the shock open, increases high-speed in the middle position for harder hitting riders or in case you take a rare trip to the Rampage and need more support for big stuff, and the third position increases total compression to improve pedaling performance.
Fast have also been developing a new, larger IFP (internal floating piston) reservoir for the Holy Grail shock. This unit pictured is in the prototype stages and will have a more refined finish, but during dyno testing the shocks temperature increases to 78ºc, a full twenty degrees less than their standard reservoir which heated to 98ºc on the same test run. This should keep riders shocks more consistent when arms and legs are struggling towards the end of long tracks.
Fast must have missed out on the memo from the bike industry, though, as both of the above parts are available as upgrades to existing shocks, so you don't need to buy a whole new product to get the latest performance.
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With the Kinematic equations:
V²=V²_0 +2a(Delta)x
i get for a initial velocity of 0 m/s to 700 m/s on a 160 mm fork an acceleration of over one Million meters per second. that would tear appart anything i know of.
And if bike forks can get to Mach 2, I wonder how fast those MX suspension goes!
@LAT2: if you look into his political afiliations you will find most Germans wont like to be compared to him but i hope it was in good Spirit as he sure was a brilliant who was much more talented than i am.
I think it is good that People know the creators of such marvels of Engineering but i think it is also important to know the dark sides.
But hell this is cycling lets get out on the Trails and ride our bikesand make sure such Things never happen again, plu i think having fun on your bike is a good step towards that
I know, you'll now tell me you are an engineer and some shit. I don't know how you can't obviously see how the mass of an object will determine the the energy needed to move and can dictate the speed on which it moves. There is a reason why when it comes to suspension, unsprung weight is a massive factor to how it responds to terrain.
For simple thinking.
Your probably correct most people wont push the limits.
FAST is aware of that fact. What they are trying to accomplish is to bring the Yari to the same level, because (as said in the article above) there is a ton of them out there and a lot of people are looking for possible replacement or upgrade options.
I deliberately bought a bike with a Yari because it was cheap, knowing that in no time there will be lots of aftermarket upgrades available, turning my cheap fork (with great chassis) into something that´ll blow any stock Fox 36 out of the water for a fraction of the price.
From personal experience i can say that FAST upgrades are great. My FAST Boxxer WC beats any currently available stock dh fork on the market by a mile, so (depending on execution) i´m quite sure these knobs do in fact provide a lot of performance gain, especially considering the Yari is a much worse fork than the Boxxer WC to begin with, so there´s even more to gain from it.
As long as companys like FAST or Avalanche exist i can confidently state that i will never again buy any of the top class fork offerings and rather go with an upgraded Damper in a low budget fork (as long as companys keep the chassis the same).
I went with an Avalance cartridge inside my Yari because Craig's design really has something to offer if you jump a lot.
This Fast thing is neat but it seems the biggest difference is they added some adjustable shims where the vanilla MC damper just has an adjustable orifice. Can't see enough details to really understand what they did yet, though.
Waterteddybear - how's that avy damper for trail/am riding?
My Stumpy came with a Yari 150 and it may be more cost effective to upgrade the damper vs sell it for cheap and then try to get into a Lyrik.
Keep in mind that the compression kit from Fast will be customed valved according to the customer needs while the Charger is made to fit everyone.
Right....
Learn to look ahead +20m and keep your brake drag low = more fun & speed for 0$€£