Great explanation! I've been learning how to fully utilize 3-way JRZ shocks on my A90 Supra and this video has been really helpful. Question: Can increasing the gas pressure in shocks help carry a larger aerodynamic load at higher speeds?
No, gas pressure will not do anything like this. Gas pressure will act like a preload and is primarily used to prevent cavitation. It can also act the keep load on the ground by controlling the minimum force the shock/spring will exert at max extension...at the expense of more seal friction. JRZ does have some low drag seals we use more sparingly due to some bushing wear, but we don't always see this. Usually use these as part of a revalve where the car is very light and the damper more directly acting (like when mounted to the upright).
Thanks! So if I'm not experiencing any cavitation then there's no reason to mess with it. I have the standard JRZ shafts, didn't opt to take their 50DA shaft @@inertialab8181
@@mjon5706Typically yes if not cavitating then leave it be. It can be lowered to a point to reduce friction, but only if you know the cavitation limit and the sealing system limit. 150psi is a pretty safe low end for most of the off the shelf RS Pro systems.
How does increasing the gas pressure affect rebound? Additional gas pressure appears to shift the dyno curve up for compression but what is the side effect for rebound in 3W system.
Coming from racing MTB, my rules were: 1. Adjust the shock for the most of the track. Ignore the few big hits and exceptions as the bottom out protection will take care of it. 2. Rebound wins races. You want your tires making contact with the ground as much as possible but don't want the rebound to be so fast that it will upset the bike. 3. High speed compression is for terrain control, low speed compression is for rider's inputs (think of the bike stability during braking). 4. Proper sag optimizes cornering on imperfect surface ( goes along point #2). 5. Shimstacks and valving are dark magic. Talk to your suspension tech about your needs and the tech can transform a cheaper shock into something that can out handle top shelf products. I hope that helps someone out there!
Great explanation! I've been learning how to fully utilize 3-way JRZ shocks on my A90 Supra and this video has been really helpful. Question: Can increasing the gas pressure in shocks help carry a larger aerodynamic load at higher speeds?
No, gas pressure will not do anything like this. Gas pressure will act like a preload and is primarily used to prevent cavitation. It can also act the keep load on the ground by controlling the minimum force the shock/spring will exert at max extension...at the expense of more seal friction. JRZ does have some low drag seals we use more sparingly due to some bushing wear, but we don't always see this. Usually use these as part of a revalve where the car is very light and the damper more directly acting (like when mounted to the upright).
Thanks! So if I'm not experiencing any cavitation then there's no reason to mess with it. I have the standard JRZ shafts, didn't opt to take their 50DA shaft
@@inertialab8181
@@mjon5706Typically yes if not cavitating then leave it be. It can be lowered to a point to reduce friction, but only if you know the cavitation limit and the sealing system limit. 150psi is a pretty safe low end for most of the off the shelf RS Pro systems.
How does increasing the gas pressure affect rebound? Additional gas pressure appears to shift the dyno curve up for compression but what is the side effect for rebound in 3W system.
It is an offset of force, but it is not damping. It effects neither unless it is preventing cavitation.
Coming from racing MTB, my rules were:
1. Adjust the shock for the most of the track. Ignore the few big hits and exceptions as the bottom out protection will take care of it.
2. Rebound wins races. You want your tires making contact with the ground as much as possible but don't want the rebound to be so fast that it will upset the bike.
3. High speed compression is for terrain control, low speed compression is for rider's inputs (think of the bike stability during braking).
4. Proper sag optimizes cornering on imperfect surface ( goes along point #2).
5. Shimstacks and valving are dark magic. Talk to your suspension tech about your needs and the tech can transform a cheaper shock into something that can out handle top shelf products.
I hope that helps someone out there!
Nitron looks like very Nice!
Great Video thanks a lot for making it
Sure thing, let is know if you have any questions!