11-02-2014, 12:18 AM | #85 | |
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11-02-2014, 12:30 AM | #86 | |
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If there are no delay valves in either slave then shrinking the line diameter should have the same effect as shrinking the slave size. There might be two ways to skin this cat. |
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11-02-2014, 12:50 AM | #87 | |
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Think of the master and slave as 2 syringes connected by a tube. Imagine the syringes are both the same diameter. Push 5 cc liquid from the first into the second. The second one will have travelled the same distance to displace the liquid. Repeat the same thing with a skinnier tube. Same effect. Now replace the second syringe with a skinnier one and push that same 5 cc. ...make sense? It worked better yesterday when I was able to wave my hands around. edit: decreasing the diameter of the tube will only increase the velocity of the fluid in the tube as the same volume is transferred between cylinders.
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11-02-2014, 01:15 AM | #88 | ||
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-4 line (0.25" ID) moves fluid slower and allows the slave to return quicker. Pedal effort is easier than -3 given no change in master or slave diameters. -3 line (0.1875" ID) moves fluid quicker but slows the slave return slightly compared to -4. Pedal effort is slightly more difficult than -3. Quote:
If installing a smaller slave makes pedal effort more difficult then the effect (from a fluid dynamics standpoint) is similar to shrinking the line diameter. The smaller slave cannot accept or return fluid as easily due to it having less volume, thus making pedal effort greater. Mechanical advantage is reduced in both scenarios. In other words, the pressure plate is now pushing the same volume of fluid using a smaller slave cylinder on the return stroke, therefore the return action is slowed down due to the increased effort required. The same thing would theoretically happen using a smaller feed line. Last edited by 37; 11-02-2014 at 01:44 AM. |
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11-02-2014, 01:36 AM | #89 | |
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Also I'm struggling with comparing the above ID to the hole in the banjo bolt. Isn't that really small?
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11-02-2014, 01:43 AM | #90 |
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LOL - we're just a couple of editing fools.
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11-02-2014, 01:49 AM | #91 |
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Well said. IMO viscous effects are negligible in this case.
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11-02-2014, 01:51 AM | #92 | ||
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Depends on the strength of your left leg. I've installed larger clutch lines in race cars with no other purpose than to reduce fatigue in longer races. Pedal feel isn't as crisp but race clutches aren't as forgiving as street vehicles. The stock clutch system in the BRZ is a wet noodle in comparison. |
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11-02-2014, 01:57 AM | #93 |
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You are confusing mechanical advantage with throttling.
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11-02-2014, 01:14 AM | #94 |
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If the stock clutch line was purposefully increased to soften the clutch feel then it would be mathematically difficult to argue against mechanical advantage. If reducing the line returns mechanical advantage to its original design state then that's not the same as throttling.
My guess is the master cylinder was made smaller with a longer throw to make effort easier. Conversely, a larger master with shorter throw should bring back the feeling most long-time manual drivers are used to having. Shrinking the slave should have the same effect as the latter assuming throw on the slave isn't increased too much and results in damage to the fork or pressure plate. Last edited by 37; 11-02-2014 at 02:13 AM. |
11-02-2014, 01:28 AM | #95 |
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What did I just spot here? I think I found my new found love. Subbed and waiting for DIY write up! Cuz I'm a total noon.
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11-02-2014, 12:29 PM | #96 |
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@Andrew025 and I just drove each other's cars. Sweet ride. Gotta get me some OFT ...and your header is sublime.
But your clutch, something's wrong. feels all mushy. ...oh, wait
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11-02-2014, 01:20 PM | #97 | |
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The pedal feels more "normal" (like every other manual I've driven) and would probably be perfect once the spring is taken out. As is, it has similar resistance as my pedal that has the spring removed except Ultramaroon's doesn't have the somewhat vague squishy feeling. I'll be buying one for sure.
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11-02-2014, 02:55 PM | #98 |
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I will definitely be waiting for a write up on this! Before, I had a 2002 Celica and the clutch was heavier and shifting was a lot easier because you could actually feel the catch point. I've had the frs for two months now and I've been frustrated the entire time. Between having the squishy feeling and dbw, I've had trouble shifting consistently without lunging forward or giving too much gas.. I work at an autogroup and we have have a vw dealership and I drove a new 2015 2 door GTI we got in the other day and the clutch felt like a dream. It had resistance and you could feel exactly where it was engaging. Honestly the response in the gas pedal was awesome too.. because of this issue with the frs I've been questioning my decision to get it... I'm hoping to fix this so I can finally be happy driving on a consistent basis!
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