Best bang for buck Coilovers
Jun 6, 2011, 11:53 AM
#31
I was just asked in a PM why the average of the two points at the left side of the plots isn't at zero force. (PMs are cool, but I'll answer in public so I don't have to type anything twice. Unless you ask a question I can't answer, of course; that I'll keep secret. 
)
Anyhoo, the reason the average is above zero is because this is a high-pressure shock. The pressure inside (which is used to avoid cavitation in the oil at high piston speeds) tries to force the shaft out of the shock, meaning that these shocks have a noticeable amount of anti-compression force when sitting still. This is why, for example, if you replace a set of dead and/or low-pressure shocks with new high-pressure shocks, your car will gain a little in height.
)Anyhoo, the reason the average is above zero is because this is a high-pressure shock. The pressure inside (which is used to avoid cavitation in the oil at high piston speeds) tries to force the shaft out of the shock, meaning that these shocks have a noticeable amount of anti-compression force when sitting still. This is why, for example, if you replace a set of dead and/or low-pressure shocks with new high-pressure shocks, your car will gain a little in height.
The Koni Yellow has very little hysteris at 0 in/sec, but it also runs little to no gas pressure depending on the model.
- Andrew
Last edited by GTWORX.com; Jun 6, 2011 at 12:06 PM.
Jun 6, 2011, 12:05 PM
#32
ps. in case it's not obvious, I like Koni Yellows
Jun 6, 2011, 12:07 PM
#33
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Im on swift springs sport and i did track about 8 times last year, the car handle very very well with sway bar and good alignment! but my shock is getting alot alot of noise now so i just ordered a set of AST 4100 from GTWORX, I can't wait to go to the track and test them out!
but trust me, springs is good enough for track!
but trust me, springs is good enough for track!
Jun 6, 2011, 12:18 PM
#34
Nope. They're just better because they're Konis.
Yeppers. That little yellow shock is a low-pressure twin-tube. For autocrossing, where the one negative of a twin-tube - the inability to dump heat efficiently - isn't really a problem, they rock. Add in the foot-valve set-up so you have true rebound-only adjustment and they doubly rock.
ps. in case it's not obvious, I like Koni Yellows
Yeppers. That little yellow shock is a low-pressure twin-tube. For autocrossing, where the one negative of a twin-tube - the inability to dump heat efficiently - isn't really a problem, they rock. Add in the foot-valve set-up so you have true rebound-only adjustment and they doubly rock.
ps. in case it's not obvious, I like Koni Yellows
- Andrew
Jun 6, 2011, 12:45 PM
#36
That helps (a lot) to explain why Sean and Chris had these on their One Lap car. When I first read that they ran BCs, I was surprised, given BC's entry-level stuff. BC's ext-res shocks are clearly quite good.
Things to note: no hysteresis at all and out-of-the-box matching left-to-right (something that even Koni needs to work on a little). The post claims complete separation between rebound and compression adjustments, although no plots to back this up are there (that I could see), as they seemed to always adjust both at once and then do another run.
Oh, the plots are inverted from those posted in this thread. Now rebound is up.
Things to note: no hysteresis at all and out-of-the-box matching left-to-right (something that even Koni needs to work on a little). The post claims complete separation between rebound and compression adjustments, although no plots to back this up are there (that I could see), as they seemed to always adjust both at once and then do another run.
Oh, the plots are inverted from those posted in this thread. Now rebound is up.
Jun 6, 2011, 12:51 PM
#39
That helps (a lot) to explain why Sean and Chris had these on their One Lap car. When I first read that they ran BCs, I was surprised, given BC's entry-level stuff. BC's ext-res shocks are clearly quite good.
Things to note: no hysteresis at all and out-of-the-box matching left-to-right (something that even Koni needs to work on a little). The post claims complete separation between rebound and compression adjustments, although no plots to back this up are there (that I could see), as they seemed to always adjust both at once and then do another run.
Oh, the plots are inverted from those posted in this thread. Now rebound is up.
Things to note: no hysteresis at all and out-of-the-box matching left-to-right (something that even Koni needs to work on a little). The post claims complete separation between rebound and compression adjustments, although no plots to back this up are there (that I could see), as they seemed to always adjust both at once and then do another run.
Oh, the plots are inverted from those posted in this thread. Now rebound is up.
- Andrew
Last edited by GTWORX.com; Jun 6, 2011 at 01:05 PM.
Jun 6, 2011, 01:02 PM
#41
I agree that, on rougher surfaces, that's a lot of rebound for, what?, 8k springs. On the washboard, gravel road near my house (that the Army Corp of Engineers refuses to fix), that would be murder.
Jun 6, 2011, 01:03 PM
#42
Actually the main advantage I see of the 2 way BC's is that the compression curve when adjusted up isn't completely pathetically soft like almost all coilovers from Asia.
It's still not a whole heck of a lot of compression though. I think he was doing his best to avoid the rock hard BC bumpstops.
- Andrew
It's still not a whole heck of a lot of compression though. I think he was doing his best to avoid the rock hard BC bumpstops.
- Andrew
Jun 6, 2011, 01:04 PM
#43
Well, I, for one, like a big "nose" on rebound, especially in the front. Gets the weight across quickly without jacking the car down in a slalom. But, then again, I only autocross and I'm neither smooth nor good at setting the car up in advance, so I need these things as a band-aid for the nut behind the wheel.
I agree that, on rougher surfaces, that's a lot of rebound for, what?, 8k springs. On the washboard, gravel road near my house (that the Army Corp of Engineers refuses to fix), that would be murder.
I agree that, on rougher surfaces, that's a lot of rebound for, what?, 8k springs. On the washboard, gravel road near my house (that the Army Corp of Engineers refuses to fix), that would be murder.
I like digressive shocks too.
- andrew
Jun 6, 2011, 01:09 PM
#45
Please say more on this, if you will. My impression of Asian shocks is that they often have too much compression for high-rate springs, as opposed to too little. (I'm from the school of thought that, as spring rates go up, the ratio of rebound to compression must go up, too.)