Bilstein PSS9 (B5 S4) dyno results, and suspension ramblings.
09-08-2006, 08:13 PM
#31
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That's a different type of shock.
You've got what appears to be a twin tube rebound adjustable shock there. Probably a KONI or something similar.
It's not completely comparable to a monotube.
When you change the input, the curves will change dramatically. He's an example of a KONI shock at the speeds shown on the left.
<img src="http://pictureposter.audiworld.com/13830/dyno.jpg">
It's not completely comparable to a monotube.
When you change the input, the curves will change dramatically. He's an example of a KONI shock at the speeds shown on the left.
<img src="http://pictureposter.audiworld.com/13830/dyno.jpg">
09-10-2006, 10:27 PM
#32
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if that's a Penske dyno . . . i thought monotube?
09-15-2006, 01:59 AM
#33
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Oversteer or understeer is determined at < 1"/sec velocity.
The 3-way <a href="http://penskeshocks.com/8760.htm">Penske 8760</a> we use on our race car is independently adjustable for low speed bump, high speed bump, and rebound. Once springs and sway bars are correct, low speed (less than 1"/sec) damping is adjusted to control load transfer and basic handling thru the various phases of a corner. High speed damping primarily determines how the car responds to rough track or corner exit alligators. Measurements up to 5"/sec are more than sufficient.
The <a href="http://www.neohio-scca.org/comp_clinic/hand_out_reprints/damper%20_2003_handout%20.pdf">Basic Damper Fundamentals</a> pdf was written by Dave Weitzenhof, one of the best drivers I know. <a href="http://www.ozebiz.com.au/racetech/theory/shocktune1.html">Shock Tuning</a> explains in detail how load transfer affects handling.
The <a href="http://www.neohio-scca.org/comp_clinic/hand_out_reprints/damper%20_2003_handout%20.pdf">Basic Damper Fundamentals</a> pdf was written by Dave Weitzenhof, one of the best drivers I know. <a href="http://www.ozebiz.com.au/racetech/theory/shocktune1.html">Shock Tuning</a> explains in detail how load transfer affects handling.
09-29-2006, 08:38 AM
#35
I agree. Would need to test at lower pk speed before making conclusions.
1. Steve Weiner, considered one of the most knowledgable p-car guys in the country, has found from testing that PSS9's (for p-cars) indeed have distinct settings:
http://forums.rennlist.com/rennforums/showpost.php?p=3442160&postcount=12
2. Bilstein's curves (taken at 1.5 in/sec pk) show distinct settings:<ul><li><a href="http://www2.bilstein.de/en/produkte/wettbewerbsvergleich.php3#16">http://www2.bilstein.de/en/produkte/wettbewerbsvergleich.php3#16</a</li></ul>
http://forums.rennlist.com/rennforums/showpost.php?p=3442160&postcount=12
2. Bilstein's curves (taken at 1.5 in/sec pk) show distinct settings:<ul><li><a href="http://www2.bilstein.de/en/produkte/wettbewerbsvergleich.php3#16">http://www2.bilstein.de/en/produkte/wettbewerbsvergleich.php3#16</a</li></ul>
09-29-2006, 11:31 AM
#36
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interesting, though the Bilstein graphs say peak 1.5 m/sec not 1.5 in/sec (i.e. way higher)?
10-02-2006, 05:40 PM
#37
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Where is Steve's graph??? (Am I missing somethign or he did not post?)
993 PSS9s and Audi PSS9s could be very different. If you read his post carefully he states that #1 and #9 are different, the rest... well up to your interpretation.
I am getting 220 wired to my garage, then we will test at additional speeds. Why not - it will be free then.
I am getting 220 wired to my garage, then we will test at additional speeds. Why not - it will be free then.
10-02-2006, 05:45 PM
#38
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WOW, Bilsteins graph confirms my findings.
Their chart shows m/s... .5 m/s is a BIG bump, mosty of us operate well below .5 m/s. If you look at .5 m/s and below, disregard red line - that is stock, there isn't that much difference. Also notice how they only show #1, #4 and #9...
Bilstein Adjustable DOES NOT EQUAL Ohlin or Penske adjustable. You are not buying world class here. I think that they may be better than some Konis and other street suspensions, but they are not discount Penskes/Ohlins.
Bilstein Adjustable DOES NOT EQUAL Ohlin or Penske adjustable. You are not buying world class here. I think that they may be better than some Konis and other street suspensions, but they are not discount Penskes/Ohlins.
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