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Ohlins DFV Shocks installed

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Old 06-28-2013, 08:07 PM
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Old 11-12-2013, 07:23 PM
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Decisions, decisions. I think I'm down to buying one of these two, but It doesn't seem that EITHER the AST 4150 OR the Ohlins DFV comes optimally valved for springs in the 600-700 range. The Ohlin's are obviously optimized for 571/457 and AST recently told me that their "standard springs" for the AST 4150's are 9k/8k, or 504/448. People are for sure running higher rates on both, but which set of dampers will better handle the higher rates? They are both "single" adjustable but quite different in that the Ohlins adjustment does something with BOTH the compression AND the rebound, right? Is this an advantage or a disadvantage when running much higher rates than the damper has been optimized for?
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Old 11-14-2013, 09:24 AM
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Originally Posted by tcjensen View Post
Decisions, decisions. I think I'm down to buying one of these two, but It doesn't seem that EITHER the AST 4150 OR the Ohlins DFV comes optimally valved for springs in the 600-700 range. The Ohlin's are obviously optimized for 571/457 and AST recently told me that their "standard springs" for the AST 4150's are 9k/8k, or 504/448. People are for sure running higher rates on both, but which set of dampers will better handle the higher rates? They are both "single" adjustable but quite different in that the Ohlins adjustment does something with BOTH the compression AND the rebound, right? Is this an advantage or a disadvantage when running much higher rates than the damper has been optimized for?
Yes the DFV adjustment changes both low and high speed compression.

I wouldn't recommend running more than 20% greater Spring Rates on the DFVs. 20% higher rates will limit you to the stiffer damper settings to match. Anything higher you will get accelerated wear. Also, the Ohlins design philosophy is softer springs for greater grip, if you go to high the car can get unsettled and feel jittery.

Unlike most other damper kits, Ohlins actually test drove the S2000 and designed the damping and springs rates to fit the cars dynamics. Most other kits take an off the shelf damper, customize the mounting points and guess at whats best. Ohlins tends to get things right. We've had 100% positive feedback on these and only 3 out of 20ish order higher spring rates. If you really want stiffer, Id order 650/700 lb/in springs for the front, move the front to the rears and stay on the stiffer damping settings.

Patrick
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Old 11-14-2013, 09:11 PM
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Originally Posted by Urge View Post
I wouldn't recommend running more than 20% greater Spring Rates on the DFVs. 20% higher rates will limit you to the stiffer damper settings to match. Anything higher you will get accelerated wear. Also, the Ohlins design philosophy is softer springs for greater grip, if you go to high the car can get unsettled and feel jittery.

Unlike most other damper kits, Ohlins actually test drove the S2000 and designed the damping and springs rates to fit the cars dynamics.
This.

I have the stock Ohlins rates. Everybody likes to **imagine** that they are a Ph.D. mechanical engineer, trained in vehicle dynamics. But few ARE. I bought my off-the-shelf Ohlins, installed them with baseline settings, and haven't touched them since.

If your car isn't fast enough with shocks set up by the Ohlins engineers, maybe the nut behind the wheel needs adjustment ... just sayin'

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