Subaru hydraulic clutch time..., Need help from the gurus! Options

[Chris H.]

Hey all,

I'm at the point where the hydraulic clutch setup needs to be mapped out for my Subie conversion. The donor trans is from a 2006 WRX with a 13/16 slave cylinder. Initial reaction is to buy a 13/16 generic (wildwood or CNC) master cylinder so they match and give a “factory” clutch feel but after some internet searches it seems that pedal travel is also a factor and might mean a different size would be better. I’ve seen some GREAT hydraulic clutch threads but could not find one for the Subie trans setup.

I’d assume the pedal throw is probably similar but could be wrong. BIGKAT is using a 3/4 and mentioned he might rather have a 5/8. His trans likely has a ¾ slave.

Any insight or thoughts on this? You don't have to be right! Brainstorming is great too. (IMG:style_emoticons/default/biggrin.gif)

[strawman]

Be sure to check what the stock Subaru clutch master cylinder sizing is, and then match it. I know my Suby master cylinder inner diameter was different than the Suby slave cylinder inner diameter. I ended up using a Honda master cylinder that has the same ID as the stock Suby one (because the Honda slave worked better for my design -- essentially because the Honda Civic clutch master has a remote reservoir) and used the stock Suby slave cylinder on the Suby trans. YMMV...

[blitZ]

This is a timely question as I am in the same place. I have the Subie slave already. What Honda MC did you use?

Be sure to check what the stock Subaru clutch master cylinder sizing is, and then match it. I know my Suby master cylinder inner diameter was different than the Suby slave cylinder inner diameter. I ended up using a Honda master cylinder that has the same ID as the stock Suby one (because the Honda slave worked better for my design -- essentially because the Honda Civic clutch master has a remote reservoir) and used the stock Suby slave cylinder on the Suby trans. YMMV...