HOW TO DO AN ADVANCED SEARCH.

Mon Jul 08, 2013 3:56 pm by Admin


For the benefit of 944Hybrids users there are two search functions available for you to use.
The purpose of this sticky is to explain the "Advanced Search" function because it is much more powerful and is the best choice when researching information.

When you log on to the site a list of options is shown in a line at the top of the page. One option is labelled "Search", use this option (NOT the search box lower down on the right).

After you click on the upper search option, a drop down box appears. At the bottom of this box is a radio button marked "Advanced …

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Clutch Master Upgrade

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Re: Clutch Master Upgrade

Post by matty89 on Mon Apr 17, 2017 4:52 pm

Old post revive Smile so after reading all of theses comments i understand taht we conclued to hainb got need a 13/16 wildwood to make a perfect diengagement of the c5 slave

using the stock porsche clutch master is a 3/4 bore?? but the stroke isnt long enought ... ? im using stock porsche MC and its giving me a uber low pedal declutch and is really hard Smile stock pressure plate and clutch from tpc kit and flywheel. tpc plate and throwout

matty89

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Re: Clutch Master Upgrade

Post by sharkey on Mon Apr 17, 2017 6:33 pm

you basicly need to consider the volume moved by the master cylinder. a larger bore will push more fluid with the same stroke. a 13/16 bore will move roughly 18% more volume than a 3/4 bore.

sharkey

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Re: Clutch Master Upgrade

Post by matty89 on Mon Apr 17, 2017 9:23 pm

sharkey wrote:you basicly need to consider the volume moved by the master cylinder. a larger bore will push more fluid with the same stroke. a 13/16 bore will move roughly 18% more volume than a 3/4 bore.
i rarely grind a gear but its limit to beeing not complet

matty89

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Re: Clutch Master Upgrade

Post by dsrracer on Tue Apr 18, 2017 5:05 pm

I have the identical issue you describe. I wanted to get enough miles to feel like the conversion was solid before I disassembled for painting (which I started about 3 weeks ago). I have about 1000 miles with only two issues- one the clutch and another some surging under high power application. I don't know whether the lack of clutch finesse or some drive line flex is the surging problem ( not an engine issue IMO). I'm wondering whether I should change to a MC of 13/16 or 7/8. Anyone have an opinion about either issue? I'm wondering about a stiffer transmission mount but I'm sure others have input which I'd really appreciate.
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Re: Clutch Master Upgrade

Post by sharkey on Tue Apr 18, 2017 6:00 pm

all i can say is that any hydraulic clutch retrofit kit using the gm concentric slave cylinder ive ever seen comes with a 13/16 master cylinder.

as i said last night, going from a 3/4" bore to a 13/16" bore is an 18% increase in fluid volume. going from a 3/4" to a 7/8" is 35% more fluid volume. id think that the 7/8" would make the clutch pedal quite heavy and be far too much fluid volume, and you would risk over centering your pressure plate

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Re: Clutch Master Upgrade

Post by dsrracer on Tue Apr 18, 2017 6:18 pm

I think I could tolerate the added pressure but I did worry about too much travel and dind't know- thanks!
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Re: Clutch Master Upgrade

Post by matty89 on Sun Jul 09, 2017 1:45 pm

its all about travel with the fluid volume Very Happy i cant believe there isnt a specific one since we all have almost the same spec cars meaning a flywheel is all the same i still cant pick which one i want to upgrade my oem porsche one to for sure its bigger than 3/4 . since that is the stock size im still getting low pedal grab and some hard shifts but no miss shifts !

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Re: Clutch Master Upgrade

Post by sharkey on Sun Jul 09, 2017 2:35 pm

looking at the hydraulic setup from the cars all these parts came out of, they all run 3/4 bore master cylinders. the combo of a gm pressure plate and slave cylinder, along with our 3/4" bore factory master cylinder, the only thing that can really be different is the clutch pedal ratio, and thats something ive never seen any mention of. at first glance looking at what typically happens, it would seem the gm cars have a lower pedal ratio than we have from factory. going with a larger bore master cylinder overcomes the issue easier than drilling the hole lower down on the clutch pedal (you would need to angle the master to do it properly).

that being said, in my experience with mostly aftermarket setups involving ls swaps with performance clutches and running non stock master cylinders (often pedal boxes), a 13/16" master has always been recommended.

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Re: Clutch Master Upgrade

Post by matty89 on Sun Jul 09, 2017 2:52 pm

what about the clutch pedal assistance spring ? if i remove it will i get more pedal ? looking for clues here or im just gonna buy a bigger master Smile i never touched the spring pressure yet on my stock pedals
and didnt drill nothing for the hydro brake or the clutch pedal

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Re: Clutch Master Upgrade

Post by sharkey on Sun Jul 09, 2017 3:00 pm

the spring just helps assist the pedal. when you start to push the pedal down the spring goes overcenter and assists your foot pushing down on the pedal. this gives a smoother feeling. it will not give any more travel, it doesnt affect it that way, it just helps push the pedal down easier.

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Re: Clutch Master Upgrade

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