 23 mm Master cylinder?, From a 930? |
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| HalfMoon |
 Oct 31 2017, 08:46 PM
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#1
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Senior Member  Group: Members Posts: 828 Joined: 13-November 12 From: Shenandoah Junction, WV Member No.: 15,144 Region Association: MidAtlantic Region  |
A friend of mine who owns a race shop that does alot of Porsche work said when queried about reducing travel on the 914 brake system that the 23mm master cylinder from a 930 would far better reduce the travel over a 19mm master cylinder.
Has anyone done this mod and if so, what were the performance gains/differences? Thanks D |
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| ChrisFoley |
Nov 1 2017, 09:04 AM
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#2
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I am Tangerine Racing Group: Members Posts: 7,968 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None 
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We just swapped out a 23mm M/C for a 22 mm VW unit in a V8 track car we have here with BIG brakes.
I thought the pedal could be modulated fine, with good toe-heel control for downshifts, but the owner wanted it to be a little easier on his leg. The other option was to install a vacuum brake booster but that would have been more work. |
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| mgp4591 |
Nov 1 2017, 11:05 AM
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#3
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914 Guru Group: Members Posts: 5,508 Joined: 1-August 12 From: Salt Lake City Ut Member No.: 14,748 Region Association: Intermountain Region
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QUOTE(Racer Chris @ Nov 1 2017, 09:04 AM)  We just swapped out a 23mm M/C for a 22 mm VW unit in a V8 track car we have here with BIG brakes. I thought the pedal could be modulated fine, with good toe-heel control for downshifts, but the owner wanted it to be a little easier on his leg. The other option was to install a vacuum brake booster but that would have been more work. Is that the M/C for the Corrado that you swapped for? I've heard good things about those being a workable compromise between the 19mm and the 23mm. I'm running the 944T calipers all around and was thinking it would be a good option for occasional track use besides street functions. |
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| ChrisFoley |
Nov 1 2017, 11:07 AM
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#4
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I am Tangerine Racing Group: Members Posts: 7,968 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None
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QUOTE(mgp4591 @ Nov 1 2017, 01:05 PM) Is that the M/C for the Corrado that you swapped for? Yes, but I haven't driven the car yet to see how it feels. |
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| tomeric914 |
Nov 1 2017, 07:03 PM
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#5
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One Lap of America in a 914! Group: Members Posts: 1,263 Joined: 25-May 08 From: Syracuse, NY Member No.: 9,101 Region Association: North East States
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20.64mm or 22.22mm Master Cylinder Option How-To thread is in my signature. Yes, I've driven it on track and yes it feels much better given my brake setup.
http://www.914world.com/bbs2/index.php?showtopic=312451 QUOTE(Racer Chris @ Nov 1 2017, 01:07 PM) QUOTE(mgp4591 @ Nov 1 2017, 01:05 PM) Is that the M/C for the Corrado that you swapped for? Yes, but I haven't driven the car yet to see how it feels. |
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| HalfMoon |
Nov 2 2017, 05:38 PM
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#6
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Senior Member Group: Members Posts: 828 Joined: 13-November 12 From: Shenandoah Junction, WV Member No.: 15,144 Region Association: MidAtlantic Region |
QUOTE(tomeric914 @ Nov 1 2017, 09:03 PM) 20.64mm or 22.22mm Master Cylinder Option How-To thread is in my signature. Yes, I've driven it on track and yes it feels much better given my brake setup. http://www.914world.com/bbs2/index.php?showtopic=312451 QUOTE(Racer Chris @ Nov 1 2017, 01:07 PM) QUOTE(mgp4591 @ Nov 1 2017, 01:05 PM) Is that the M/C for the Corrado that you swapped for? Yes, but I haven't driven the car yet to see how it feels. WOW! No that is some cool intel. Thanks a bunch for sharing that. I know you did the 20.64, but what's your thought on reduction of pedal throw using the 22.22 and other than cost, what would the advantage be over the 930 23mm? Do you think the 22.22 is slightly less stiff than the 23? David |
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| ChrisFoley |
Nov 2 2017, 07:08 PM
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#7
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I am Tangerine Racing Group: Members Posts: 7,968 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None
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QUOTE(HalfMoon @ Nov 2 2017, 07:38 PM) QUOTE(tomeric914 @ Nov 1 2017, 09:03 PM) 20.64mm or 22.22mm Master Cylinder Option How-To thread is in my signature. Yes, I've driven it on track and yes it feels much better given my brake setup. http://www.914world.com/bbs2/index.php?showtopic=312451 QUOTE(Racer Chris @ Nov 1 2017, 01:07 PM) QUOTE(mgp4591 @ Nov 1 2017, 01:05 PM) Is that the M/C for the Corrado that you swapped for? Yes, but I haven't driven the car yet to see how it feels. WOW! No that is some cool intel. Thanks a bunch for sharing that. I know you did the 20.64, but what's your thought on reduction of pedal throw using the 22.22 and other than cost, what would the advantage be over the 930 23mm? Do you think the 22.22 is slightly less stiff than the 23? David The 23mm M/C is really 23.8mm in diameter. |
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Posts in this topic
HalfMoon 23 mm Master cylinder? Oct 31 2017, 08:46 PM
Vacca Rabite
A friend of mine who owns a race shop that does a... Oct 31 2017, 09:32 PM
HalfMoon
A friend of mine who owns a race shop that does ... Oct 31 2017, 10:05 PM porschetub
A friend of mine who owns a race shop that does a... Oct 31 2017, 10:19 PM Mike Bellis I'm running a 23 but I also have 930 brakes. I... Oct 31 2017, 10:39 PM HalfMoon
I'm running a 23 but I also have 930 brakes. ... Oct 31 2017, 10:56 PM shoguneagle Agree with all the above. I am running 23mm M/C w... Oct 31 2017, 10:52 PM HalfMoon
Agree with all the above. I am running 23mm M/C ... Oct 31 2017, 10:57 PM HalfMoon To clarify-
I run a 19mm too (as well as a variet... Oct 31 2017, 10:55 PM mepstein
To clarify-
I run a 19mm too (as well as a varie... Nov 1 2017, 05:30 AM jd74914
To clarify-
I run a 19mm too (as well as a vari... Nov 1 2017, 05:49 AM mepstein
[quote name='mepstein' post='2544209' date='Nov 1... Nov 1 2017, 05:58 AM HalfMoon
To clarify-
I run a 19mm too (as well as a vari... Nov 1 2017, 10:02 AM mepstein
[quote name='mepstein' post='2544209' date='Nov 1... Nov 1 2017, 11:36 AM porschetub
[quote name='mepstein' post='2544209' date='Nov ... Nov 1 2017, 04:59 PM infraredcalvin It’s not a 930 MC is a 23 mm ATE MC for a Merced... Oct 31 2017, 11:50 PM infraredcalvin Sorry had to edit above... Oct 31 2017, 11:55 PM flyer86d My old 911SC track car had turbo brakes front and ... Nov 1 2017, 05:30 AM DBCooper And, important to note, with just a larger m/c you... Nov 1 2017, 08:28 AM HalfMoon
We just swapped out a 23mm M/C for a 22 mm VW uni... Nov 1 2017, 10:05 AM tomeric914 David,
This is basic hydraulics, but somehow, too... Nov 2 2017, 07:54 PM HalfMoon
David,
This is basic hydraulics, but somehow, to... Nov 2 2017, 11:48 PM Keyser Sose I currently run a 19mm and find that their's s... Nov 3 2017, 10:56 AM Racer Chris
the bias valve can make it hard to get them full... Nov 3 2017, 03:03 PM Keyser Sose
the bias valve can make it hard to get them ful... Nov 3 2017, 03:37 PM Racer Chris
So do those valves ever go bad?
They don't ... Nov 4 2017, 09:06 AM tomeric914 THIS IS AN EXAMPLE ONLY!!! You need t... Nov 3 2017, 03:04 PM DBCooper OK, when I got my car the pedal was way too hard. ... Nov 1 2017, 10:34 AM Dave_Darling When you change the diameter of the master cylinde... Nov 1 2017, 09:48 PM tomeric914 ...on a bone stock brake system
When you change ... Nov 2 2017, 08:39 AM Dave_Darling
...on a bone stock brake system
No, that's ... Nov 2 2017, 12:07 PM tomeric914 The reason for going with a larger master cylinder... Nov 2 2017, 07:36 PM SirAndy When you change the diameter of the master cylinde... Nov 2 2017, 11:19 AM porschetub
When you change the diameter of the master cylind... Nov 2 2017, 06:59 PM GeorgeRud Is the lack of a proportioning valve on the 911s b... Nov 4 2017, 09:19 AM |
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