Bilstein PSS9 (B5 S4) dyno results, and suspension ramblings.
09-05-2006, 03:33 PM
#21
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I don't think you've got a case yet.
You've only got graphs for at one speed, a relatively slow speed of 5in/s.
Perform testing across the board from 1inch/s up to 14 or 16inch/s, and I'm sure you'll much clearer differences between the various shock settings.
Perform testing across the board from 1inch/s up to 14 or 16inch/s, and I'm sure you'll much clearer differences between the various shock settings.
09-05-2006, 04:58 PM
#22
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Not at one speed, but up to 5" / sec. Dyno time is expensive... maybe next year.
In street cars you rarely get anything above 5" / sec. rumble strips... maybe.
09-06-2006, 06:44 AM
#24
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so you're saying that the only place that the other 8 setting differ is in the highest-speeds?
09-06-2006, 09:55 AM
#26
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Not necessarily.
They could differ at slower speeds as well.
Testing just a single speed only gives you a graph at that speed, nothing else. You can't necessarily infer that the shock will behave exactly the same at every other speed.
Testing just a single speed only gives you a graph at that speed, nothing else. You can't necessarily infer that the shock will behave exactly the same at every other speed.
09-06-2006, 10:40 AM
#27
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I'm confused...
If we're trying to fiddle with the car's handling, under 5"/sec is where we're likely to see an effect. At the higher piston speeds, you're only likely to see an increase in ride harshness and loss of traction.
09-06-2006, 12:48 PM
#28
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To clarify..
To say that these shocks simply "have 2 adjustment settings, not the 9 advertised" is probably very premature to be saying without testing the shock at more cycle speeds.
I'd agree most of the suspension movement is relatively slow, but by no means is suspension only limited to 5in/sec motions.
I'd agree most of the suspension movement is relatively slow, but by no means is suspension only limited to 5in/sec motions.
09-06-2006, 12:52 PM
#29
Over 5 would be important in handling expecially on many roads and tracks with...
many small surface inturruptions. I'm surmising that you want the shock to be able to hold up in all situations for optimum handling and ride. cheers! Mike
09-06-2006, 01:50 PM
#30
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Let me show you what I mean by an adjustable shock.
Shock do not start acting differently at higher speeds. The lines would begin to diverge at lower speeds, and the difference could be more pronounced at higher speeds.
Also look carefully at the colors. On the fronts red and purple are closer on the rebound side, while they are at the opposite ends of the adjustement spectrum.
I agree that if you extrapolate instead of the 30 lbs. difference at 5" /sec. we may see a 60 lbs. difference at 10" / sec. But look at the randomnes of the lines versus adjustement.
As to useable range. 5" / sec. is fast. Unless you are building a car for gravel roads anything after that does not matter. Yes, a pothole may feel stiffer - but that setting has no impact on performance.
Let me show you what and adjustable shock should be able to do:
<img src="http://www.startupracing.com/images/Suspension/RbAdj.jpg">
Also look carefully at the colors. On the fronts red and purple are closer on the rebound side, while they are at the opposite ends of the adjustement spectrum.
I agree that if you extrapolate instead of the 30 lbs. difference at 5" /sec. we may see a 60 lbs. difference at 10" / sec. But look at the randomnes of the lines versus adjustement.
As to useable range. 5" / sec. is fast. Unless you are building a car for gravel roads anything after that does not matter. Yes, a pothole may feel stiffer - but that setting has no impact on performance.
Let me show you what and adjustable shock should be able to do:
<img src="http://www.startupracing.com/images/Suspension/RbAdj.jpg">