Evols on a Pro
- Thread starter Leaf27
- Start date
I was looking at these as well, I went with Raptors instead. I haven't gotten them yet, but I cannot say enough good things about their customer service!! I spent about 45 minutes on the phone with them pretty much learning anything I will ever need to know about the socks. Great people! 
I have them, the complete set from Carls, front and rear. I love the adjustability and dialin, setting air takes longer than spring settings. Better than stock - absolutely. Worth it - in the eyes of the buyers. No deep snow issues with the setup. I took out an a-arm and didn't damage the front shock, also. I would do it again. Heard good things about exits, also. I did find the rears as valuable as the ski shocks.
I have them on the front of my Pro love them way better than stock. Got mine at Carl's
Thanks Guy's, I will probably buy them from Nextech along with there Carbon fiber rails. Had thier Mono supension in my XP, worked great. Curt is great to deal with.
http://www.carbonsled.com/rear_suspension_polaris.htm
http://www.carbonsled.com/rear_suspension_polaris.htm
Gman.... how does an EVOL resist bottoming better than say a Float2 or spring shock?
I have EVOL X's Kashima's on the skis...Timbersled EVOL X rear.
Really like them both...
With an adjustable shock... you have more of a chance of being outside of the sweetspot than hitting it... You have to take time to get used to tuning an adjustable shock... On the Float X you have Main air pressure, EVOL air pressure, Low speed compression, high speed compression, and rebound (which also has a big effect on low speed compression) 5 different adjustments... you really have to understand the shock to get any more out of it than you would a standard float2 IMO.
Really like them both...
With an adjustable shock... you have more of a chance of being outside of the sweetspot than hitting it... You have to take time to get used to tuning an adjustable shock... On the Float X you have Main air pressure, EVOL air pressure, Low speed compression, high speed compression, and rebound (which also has a big effect on low speed compression) 5 different adjustments... you really have to understand the shock to get any more out of it than you would a standard float2 IMO.
He's right. At least when comparing an air shock to a coil shock.
Coil springs are linear rate. Example - It takes 50 lbs of pressure to compress one inch, another 50 for the next inch, 50 for the next, and so on. (Flat unchanging rate)
(They CAN, however, be designed as rising rate or progressive - by different gaps between coils or tapered wire spring. This is generally not the case though unless you went with a custom shock or spring)
Example of a dual rate spring -
Example of a tapered wire spring -
Air shocks are rising rate or progressive by nature. (The degree of rising rate is determined by the starting and ending volume of air canister)
As the air chamber becomes smaller through the shocks compression, the same volume of air from when we started with the shock uncompressed has to fit into a smaller area. The more it compresses, the more the air will resist said compression. So let's say it takes 50 lbs of pressure to compress the shock one inch, 60 lbs of pressure to compress the shock another inch. The more it is compressed, the more progressive (or the more bottoming resistance it has) it becomes. At the last inch of travel, it may take 100 lbs of pressure to compress the shock that last inch.
There is a lot of technology that goes into air shocks to try to keep them more linear like a coil spring. They are progressive though. That technology just keeps them from being TOO progressive and feeling spiky or dead through the bumps.
Hopefully that makes sense.
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gman086
Well-known member
Eric you know, as well as I, that the Evols are more progressive than a standard coil (I HAVE had progressive coil springs as well as dual rates that can overcome their linear deficiency). And Float 2's are just a joke compared to custom valved Evol R's with custom pistons, even with the new remote Float2 chambers. I know you know this so why are you baiting me?
I'm finally happy with the way my Pro rides and that's all that matters to me. The Walker Evans suck no matter how much damping you do, they will still bottom with those pathetic stock springs! In fact I've hear both Raptor and Z Bros have come up with dual rate replacements for the lame stock springs on the Pro and they work quite well from what I'm told. Probably would have gone that route had I known (had to sell another sled to pay for my Evols!).Have FUN!
G MAN
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Gman... not baiting you at all.
EVOL's are less progressive than a Float2 though... Unless you crank up the EVOL chamber pressure higher than the main when the shock is fully compressed... that would effectively "lock out" the IFP in the EVOL chamber and defeat the purpose ... Which is to allow you to run higher initial spring force (main air pressure) without the end of travel ramp-up of the pressure that can make them harsh.
I had a good talk with Tom Dynes at his shop about this very topic a couple of weeks back.
EVOL Cutaway
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From FoxRacingShox website:
The EVOL chamber allows this volume to be variable as the shock compresses.
I believe that the EVOL R's and X's will be running a jounce bumper next season... The Elka shocks above... EXIT's Raptors etc.. have jounce bumpers as well... that really ramps up the spring rate at the end of travel...
The 2013 PRO RMK's have the same shocks with a minor change in the valving... but they also run a jounce bumper on them... the 2011's and 2012's did not.... which I think is a small detail that can make them more bottom resistant... and something that is cheap and easy to add to the shock. (one of the least expensive in fact).
Those EVOL R's ARE excellent shocks... with a lot of technology in them... wait another season and you'll see even more evolution of the same shock.
If you like mogul bashing as much as you talk about...you should try a X model with the DSC feature!
Glad you finally got her dialed in the way you need it.
Ride hard my friend!!
.
EVOL's are less progressive than a Float2 though... Unless you crank up the EVOL chamber pressure higher than the main when the shock is fully compressed... that would effectively "lock out" the IFP in the EVOL chamber and defeat the purpose ... Which is to allow you to run higher initial spring force (main air pressure) without the end of travel ramp-up of the pressure that can make them harsh.
I had a good talk with Tom Dynes at his shop about this very topic a couple of weeks back.
EVOL Cutaway
From FoxRacingShox website:
The EVOL chamber allows this volume to be variable as the shock compresses.
I believe that the EVOL R's and X's will be running a jounce bumper next season... The Elka shocks above... EXIT's Raptors etc.. have jounce bumpers as well... that really ramps up the spring rate at the end of travel...
The 2013 PRO RMK's have the same shocks with a minor change in the valving... but they also run a jounce bumper on them... the 2011's and 2012's did not.... which I think is a small detail that can make them more bottom resistant... and something that is cheap and easy to add to the shock. (one of the least expensive in fact).
Those EVOL R's ARE excellent shocks... with a lot of technology in them... wait another season and you'll see even more evolution of the same shock.
If you like mogul bashing as much as you talk about...you should try a X model with the DSC feature!
Glad you finally got her dialed in the way you need it.
Ride hard my friend!!
.
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MH what you are saying is confusing. ALL the set up data that I got from Tom shows main pressure quite a bit lower than Evol pressure. For an Evol R used on an XP for my son's weight he said start with 60lbs in the main and 90 in the Evol. We backed off the main a few pounds so far and they work good. It is my under standing that the main pressure builds up as the shock is compressed then peaks and transitions to the EVOL chamber to prevent bottom out. I am using Tom's Evol Rs on my Freeride and like them a ton better than stock. Tom's service is pretty spectacular too. I have some more set up to do and will be posting a full report. Very happy with the purchase so far.
W
wasatchcomm
Well-known member
i had fastrax in tacoma "do their thing" to the stock WE shocks and they have a dual rate spring package that works very well.
i have zbros on my m8t and love them, expensive!
fastrax mod to shocks is very reasonable.the shocks are awesome now, feel very close to my zbros.
i highly recommend!!!
G
gman086
Well-known member
Gman... not baiting you at all.
EVOL's are less progressive than a Float2 though... Unless you crank up the EVOL chamber pressure higher than the main when the shock is fully compressed... that would effectively "lock out" the IFP in the EVOL chamber and defeat the purpose ... Which is to allow you to run higher initial spring force (main air pressure) without the end of travel ramp-up of the pressure that can make them harsh.
I had a good talk with Tom Dynes at his shop about this very topic a couple of weeks back.
EVOL Cutaway
\
From FoxRacingShox website:
The EVOL chamber allows this volume to be variable as the shock compresses.
I believe that the EVOL R's and X's will be running a jounce bumper next season... The Elka shocks above... EXIT's Raptors etc.. have jounce bumpers as well... that really ramps up the spring rate at the end of travel...
The 2013 PRO RMK's have the same shocks with a minor change in the valving... but they also run a jounce bumper on them... the 2011's and 2012's did not.... which I think is a small detail that can make them more bottom resistant... and something that is cheap and easy to add to the shock. (one of the least expensive in fact).
Those EVOL R's ARE excellent shocks... with a lot of technology in them... wait another season and you'll see even more evolution of the same shock.
If you like mogul bashing as much as you talk about...you should try a X model with the DSC feature!
Glad you finally got her dialed in the way you need it.
Ride hard my friend!!
.
I hear what you're saying MH, but you still have a limited amount of volume with both the main and EVOL chambers; the EVOL system just allows for later ramp up of the eventual progressive finish of an air shock system. And Tom likes to run 50-60 psi mains and 90 psi Evol (fronts). I took Chris' advice and went higher on the Evol chamber to 125 which gives the bottom out prevention without negating the plush initial stroke feel. I think Tom is missing the boat on what he's recommending but we each have our riding styles and that's the beauty of being able to fine tune these! And yes, I would LOVE a set of EVOL X's but my budget doesn't allow for that. The R's are adequate for typical deep snow riding and I still have my Hygear equipped Renegade for bump and jump riding.
CHEERS!
G
You have it right... but I probably was poor in my communication.
The EVOL chamber always has a higher pressure in than the main.
The main pressure does build as the shock is compressed... The EVOL "yields" at a point where the EVOL pressure is LESS than the main and the EVOL-IFP (Internal Floating Piston) begins to move.
This Softens the end of travel so that the shock is not harsh in the last part of the travel because the pressure in the main ramps up so high. This allows you to use higher main chamber pressures and still retain full shock travel...Giving you a secondary progressive spring rate as the IFP also maxes out.
The Higher the pressure in the EVOL... the less travel the IFP has... and the more progressive (the pressure ramps up faster)... Up to the point where the
EVOL pressure is so high that the IFP does not move when the shock is fully compressed.
You can get the same characteristics from a Zero-Pro Spring shock as you can a Float..you just will not have the variable spring rate other than pre-load... also as pointed out above... spring type and quality play a big role here.
G
Tom is a master tech with the Foxes...and gives Fox Factory a lot of valuable feedback and help with development of shocks on the snow side of things...The R-EVOL was his "baby". By his own admission, he does not have much time on the PRO-RMK Shock setups which would explain why you feel Burandts pressures work for you and you feel Tom is "missing the boat".
I would not put Chris (also by his own admission) in the category of shock tuner though... He works closely with Jeff Favorite at FoxRacingShox to pull off the internal tuning of what he describes he needs... Pretty cool having a Fox Rep tailor your shocks to your needs.. very cool indeed!!
Tom is a master tech with the Foxes...and gives Fox Factory a lot of valuable feedback and help with development of shocks on the snow side of things...The R-EVOL was his "baby". By his own admission, he does not have much time on the PRO-RMK Shock setups which would explain why you feel Burandts pressures work for you and you feel Tom is "missing the boat".
I would not put Chris (also by his own admission) in the category of shock tuner though... He works closely with Jeff Favorite at FoxRacingShox to pull off the internal tuning of what he describes he needs... Pretty cool having a Fox Rep tailor your shocks to your needs.. very cool indeed!!
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aksnopro
Well-known member
all technical bs aside, i have evols on my new hcr, and cant wait to put a quility 5/8 shaft res adjustable shock on. preferably the exit X1's tripple rate springs.they will make you smile everywhere and not leave you messing with air pressure every temperature change.
get a tripple rate shock! either raptor, exit or any other brand! they soak up cross ruts excellent, lay over easy, yet still have the mid and bottom out for your big hucks!
i have had floats, float2's, evols, exits, walker evans, ect i think floats have there place in the weight world, but have no place in the peformance area as any quality tipple rate 5/8 shaft clicker shock.
-Aksnopro
get a tripple rate shock! either raptor, exit or any other brand! they soak up cross ruts excellent, lay over easy, yet still have the mid and bottom out for your big hucks!
i have had floats, float2's, evols, exits, walker evans, ect i think floats have there place in the weight world, but have no place in the peformance area as any quality tipple rate 5/8 shaft clicker shock.-Aksnopro
