Raceland Dyno Test Results
#1
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Raceland Dyno Test Results
Speaking of dyno charts, Disaster was kind enough to volunteer his new and unused Raceland shocks for dyno testing at Stewart Development.
Bernie dynoed the shocks today, and here are the results.
There's a lot more to this story, as Bernie had a look inside while the shocks were there. What he found was a bit surprising, but I haven't seen the photos yet so I'll leave it at that.
Bernie dynoed the shocks today, and here are the results.
There's a lot more to this story, as Bernie had a look inside while the shocks were there. What he found was a bit surprising, but I haven't seen the photos yet so I'll leave it at that.
#9
The big thing that struck me was how much less rebound damping there was on the rear shocks. I'm not sure why you'd want less rebound damping on the rear suspension....especially that much less.
I'd also be curious to see how these compared to the stock OEM Koni's and a typical aftermarket shock, like the GR2's.
#10
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Looks like a decent aftermarket shock (similar to the Xida curve) in the front and a stock shaped curve in the rear (similar to Koni sports or AGX on soft).
People are saying these things are smooth on the highway?
People are saying these things are smooth on the highway?
Last edited by Braineack; 12-04-2010 at 03:05 AM.
#11
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They're reported to be comfy for those who leave some bump travel in their setups. I suspect they'd reach their limits and become quite boingy on a rough road pretty quickly; especially the back.
What struck me is that the rears have more bump damping than rebound damping. First time I've seen that in a dyno graph.
What struck me is that the rears have more bump damping than rebound damping. First time I've seen that in a dyno graph.
#15
Horrible, IMO. They're just underdamped in general.
Front, Bump - Poor low speed damping for the spring rates. High speed gradient too aggressive
Rear, Bump - As above, just worse.
Front, Rebound - No low speed control for transient control. High speed rate a touch too aggressive
Rear, Rebound - As above, just worse
Classic mistake of tuning for spring rates ie a stiffer spring needs more damping. That's not the case, as you're tuning ride frequencies not spring rates.
Phil
PS Does Bernie have a F vs PV graph as that would be the raw data rather than averaging which provides another view of the data?
Front, Bump - Poor low speed damping for the spring rates. High speed gradient too aggressive
Rear, Bump - As above, just worse.
Front, Rebound - No low speed control for transient control. High speed rate a touch too aggressive
Rear, Rebound - As above, just worse
Classic mistake of tuning for spring rates ie a stiffer spring needs more damping. That's not the case, as you're tuning ride frequencies not spring rates.
Phil
PS Does Bernie have a F vs PV graph as that would be the raw data rather than averaging which provides another view of the data?
#16
We've got a 2009 Hyundai Genesis that has this exact problem. A lot of people on the forums complaining about the shocks and springs being "too stiff" but in reality, it is a bit underdamped, which can allow the suspension to get excited over surfaces that it should not. Some people say they've hit sections of highway pavement where the car starts porpoising back and forth. The spacing of the waves in the pavement overwhelms the dampers. I'm looking into buying upgraded components from the 2010, but it just occured to me that maybe someone like Bernie could tune the shocks we've got on there...though I don't think my wife would be too happy to have her car up on blocks for a couple weeks. :-D
The only obvious underdamping I see, is the rear's in rebound.
Classic mistake of tuning for spring rates ie a stiffer spring needs more damping. That's not the case, as you're tuning ride frequencies not spring rates.
Phil
PS Does Bernie have a F vs PV graph as that would be the raw data rather than averaging which provides another view of the data?
Phil
PS Does Bernie have a F vs PV graph as that would be the raw data rather than averaging which provides another view of the data?
I imagine he has all the typical data that dyno testing would provide but he's also got customer's shocks to work on, so more data and analysis, from him, will have to wait.
Last edited by Disaster; 12-04-2010 at 08:41 AM.