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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 11-07-2014, 06:45 PM   #127
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I'll call them & see if they know the bore size on the cylinder.
As long as it's for an N/A motor it should be 3/4". Turbo motors have heavier clutches and get the larger 13/16" slave. Why the N/A FA20 gets the larger slave is a mystery, other than it possibly being chosen by engineering to lighten pedal feel.

I just had an original Subaru 30620AA111 slave arrive in the mail this morning and it's identical to what's in the BRZ other than piston size. This is definitely what you want (or in your case what you want to use as a cross-reference part number).
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Old 11-08-2014, 02:12 AM   #128
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As long as it's for an N/A motor it should be 3/4". Turbo motors have heavier clutches and get the larger 13/16" slave. Why the N/A FA20 gets the larger slave is a mystery, other than it possibly being chosen by engineering to lighten pedal feel.

I just had an original Subaru 30620AA111 slave arrive in the mail this morning and it's identical to what's in the BRZ other than piston size. This is definitely what you want (or in your case what you want to use as a cross-reference part number).
I'll most likely take a chance and try the slave cylinder that I found, it looks to be correct & I can't find the OEM part for less then $50. Thanks for the info on N/A vs Turbo, didn't know that still learning about clutches and what not.
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Old 11-08-2014, 04:37 PM   #129
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So, my wife took it out this morning. She says and I quote "It's much better. Makes it way easier to peel out."

My brother said he wishes his 911 felt like that. "Feels like a dirt bike clutch because you know right where it is the whole time."
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Old 11-08-2014, 06:47 PM   #130
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So, my wife took it out this morning. She says and I quote "It's much better. Makes it way easier to peel out."

My brother said he wishes his 911 felt like that. "Feels like a dirt bike clutch because you know right where it is the whole time."
Ah I'm stoked lol. My cylinder comes in Tuesday, went with the one I linked.
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Old 11-09-2014, 09:02 AM   #131
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How is this different than adjusting the pedal that I've read a lot of other people doing? Other than the part you change/adjust of course. What benefit does this have over adjusting the pedal, or is the goal with this different?
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Old 11-09-2014, 10:33 AM   #132
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A slave cylinder with a different sized piston will move travel more, or less given the same volume/pressure from the master cylinder.
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Old 11-09-2014, 02:35 PM   #133
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A slave cylinder with a different sized piston will move travel more, or less given the same volume/pressure from the master cylinder.
I'm trying to understand the reason for doing this. Is this an alternative to adjusting the clutch pedal grabbing point? ( http://www.ft86club.com/forums/showthread.php?t=8040 ) Or used in conjunction? Or for trying to do something unrelated? What would be the pros/cons of either?
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Old 11-09-2014, 03:00 PM   #134
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I'm trying to understand the reason for doing this. Is this an alternative to adjusting the clutch pedal grabbing point? ( http://www.ft86club.com/forums/showthread.php?t=8040 ) Or used in conjunction? Or for trying to do something unrelated? What would be the pros/cons of either?
not judging - have you read the whole thread yet? I'm not into tl:dr.
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Old 11-09-2014, 04:00 PM   #135
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Finally installed mine today. The engagement shrunk enough to where you can feel a definitive grab point versus the vague stock throw. Overall pedal travel feels much closer to what I'd consider normal. Weight feels no different and certainly no heavier to me.

It should have been a 3/4" slave from the factory.

I'd still like to try replacing the soft line with -3 AN to eliminate that as a variable. I'll give the slave a few weeks and go from there.
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Old 11-09-2014, 08:18 PM   #136
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not judging - have you read the whole thread yet? I'm not into tl:dr.
EDIT: I read it again and it makes more sense now. You mentioned adjusting the pedal too. Why?
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Old 11-09-2014, 08:56 PM   #137
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no, no. Just means it can be better explained. This is a very interesting hydraulic actuator design issue. Understand this intuitively and your mechanical aptitude will jump to a higher level.

This is archimedes' principle at it's best and I bet you already understand it. You just haven't yet made the connection between a mechanical lever and a hydraulic one.

I will be editing this but just wanted you to see my reply.
Thanks for the reply. I have the basics down but I guess it is my lack of knowledge of the components of the clutch system.

How's your tutorial for this coming? Actually, just a complete part list is all I need. :-) I have replaced both the master and slave in my Miata.
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Old 11-09-2014, 09:15 PM   #138
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Actually, just a complete part list is all I need. :-)
Posted earlier in the thread: http://www.ft86club.com/forums/showp...&postcount=118

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Old 11-09-2014, 09:21 PM   #139
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Thanks for the reply. I have the basics down but I guess it is my lack of knowledge of the components of the clutch system.

How's your tutorial for this coming? Actually, just a complete part list is all I need. :-) I have replaced both the master and slave in my Miata.
You need the new slave and the crush washers. @37 already verified the subaru P/Ns for both.

Go for it.
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Old 11-09-2014, 09:25 PM   #140
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Saw that. Thanks. I wasn't sure if that was the "official" parts list.
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