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Most of us have probably seen hundreds of Evo engine dyno charts but probably much fewer Evo damper dyno charts. While rebuilding my Evo I sent my JRZ RS 2 way dampers to Olsen Motorsports for inspection, repair and rebuild. They provided this Roehrig dyno chart afterward, and while I am admittedly pretty ignorant I thought I would share in case anyone found it interesting. Shock data and how it is presented seems to vary but data is data. As you can see it is digressive at first then very flat.
If anyone else has Evo damper dyno charts it would be interesting to see and compare.
Good topic. Been interested in shock dynos for years. Would love to see a head to head comparison of plots w/all the big hitters
Curious how similar or different they all are comparatively?
Yes, that's what I would like to see as well.
Did you mean how various brands/models compare or how all 4 of mine compare? In the latter case, I wish I had that data but this is all I got from them, probably because there was some visible damage to one of my front coilovers only. I can try to ask in case they have more.
Most of us have probably seen hundreds of Evo engine dyno charts but probably much fewer Evo damper dyno charts. While rebuilding my Evo I sent my JRZ RS 2 way dampers to Olsen Motorsports for inspection, repair and rebuild. They provided this Roehrig dyno chart afterward, and while I am admittedly pretty ignorant I thought I would share in case anyone found it interesting. Shock data and how it is presented seems to vary but data is data. As you can see it is digressive at first then very flat.
If anyone else has Evo damper dyno charts it would be interesting to see and compare.
Eek, Im certainly not a shock expert but thats not a very good looking plot you got there. Compression has a knee but its at a really low speed even compared to the other chinese sourced dampers (FA included..). Rebound seems to do almost nothing till its moving fast giving you almost no control of weight transfer rates. If that was my shock, I would be looking to make some changes TBH. Surprised that came from the JRZ's.
I couldn't find any shock dynos for my dampers (Toda Fightex DA-G), but this is what they list on the website as being possible through custom-ordered valving. The plot on the left looks pretty decent.
Eek, Im certainly not a shock expert but thats not a very good looking plot you got there. Compression has a knee but its at a really low speed even compared to the other chinese sourced dampers (FA included..). Rebound seems to do almost nothing till its moving fast giving you almost no control of weight transfer rates. If that was my shock, I would be looking to make some changes TBH. Surprised that came from the JRZ's.
Something is very wrong here.
It looks like that knee is sharp because they don't have many data points in that region.
The total lack of rebound damping at low speeds also doesn't make sense.
Usually two different colors on a shock dyno would represent the extremes of adjustment. In this case, the red and blue lines basically overlap, indicating no adjustment. Or maybe the operator didn't adjust them?
JRZ is a respected company, so I'm guessing either operator error on the shock dyno or something wrong with the rebuild.
It looks like that knee is sharp because they don't have many data points in that region.
The total lack of rebound damping at low speeds also doesn't make sense.
Usually two different colors on a shock dyno would represent the extremes of adjustment. In this case, the red and blue lines basically overlap, indicating no adjustment. Or maybe the operator didn't adjust them?
JRZ is a respected company, so I'm guessing either operator error on the shock dyno or something wrong with the rebuild.
Yeah this just doesnt seem right. In general I dont like the idea of really low knees (in the ~1in/sec range and lower) but this is waaay low on compression. Something borked!
Appreciate the feedback guys. Although it's not positive, it's good to receive. To be clear, this was for a front shock that was rebuilt and serviced by a third party, not JRZ. Maybe I should get a second reevaluation for all 4. Thanks again.
i was just about to post here. I got my Ohlins today with valving - seems very linear, what are the pros and cons vs digressive?
also not sure here if the chart is 6 clicks from stiff or from soft, not sure what the convention is.
According to Ohlins, this valving is based on a ton of data that they collect. In that data some is centered around wheel rates, weights of the car in combination with spring rates to come up with what they feel is the optimal damping curves. When we revalve for a higher or lower spring rate we will keep the shape of the base curve and increase or decrease it % wise for the spring requested.
The jrz plot, while done at crappy settings, doesn't look broken to me.
I'm assuming by "crappy settings" this means this dyno graph was probably set to full soft for rebound and compression? Essentially, it's not showing a graph with a high rebound and/or compression setting/having an overlay of multiple settings on the damper?
I'll post up my JRZ motorsport triples chart when I have a chance, but I want to say it looks somewhat similar off the top of my head.
I'm assuming by "crappy settings" this means this dyno graph was probably set to full soft for rebound and compression? Essentially, it's not showing a graph with a high rebound and/or compression setting/having an overlay of multiple settings on the damper?
I'll post up my JRZ motorsport triples chart when I have a chance, but I want to say it looks somewhat similar off the top of my head.
Looks like full stiff compression and full soft rebound to me.
