996 Turbo / GT2 Turbo discussion on previous model 2000-2005 Porsche 911 Twin Turbo and 911 GT2.

997 gt3 brake master psm fix

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Old Apr 29, 2019 | 06:51 AM
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may i also mention, the psm did work flawlessly where it was supposed to. I kept it on for most of the day, driving in light rain semi-dry track. Leaving apex coming to full throttle, there were times it kicked in to limit power and wheel spin appropriately. It also kicked in coming around corners a bit hot.
 
Old Apr 29, 2019 | 07:03 AM
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Originally Posted by jdexter
So I got on the track today at the glen. First half of the day, it was snowing. However it warmed up and the sun came out. My impressions are mixed. The feel of my brake pedal with the 997gt3 master is much improved, however psm seems to interfere in neutral throttle corners often. I eventually just turned it off and felt much happier that way. Overall I was a bit slower today on new r compounds than last year, but it's cold... tomorrow looks like rain/snow so I'll try again in May.
Originally Posted by jdexter
may i also mention, the psm did work flawlessly where it was supposed to. I kept it on for most of the day, driving in light rain semi-dry track. Leaving apex coming to full throttle, there were times it kicked in to limit power and wheel spin appropriately. It also kicked in coming around corners a bit hot.
Justin the psm interference will always happen if its turned on. This mood is just to allow you to keep the psm while using the larger master. You'll want to turn psm off on track and if you really want psm gone you'll still need to pull the plug on the psm pump to completely disable.
 
Old Apr 29, 2019 | 07:42 AM
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Agreed. I was just noting that it felt a touch more intrusive, but with the r compounds and the wet are the likely source. Bottom line, no error codes, everything works as it should, upgraded master is a nice upgrade.
 
Old Apr 29, 2019 | 08:59 AM
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Great news, now I wonder if you reduced the pressure a tad more, would you actually be able to "adjust" the effect of the PSM for different conditions ? Soon as I have time to do this mod might hook a pressure transducer up to my system and check how it does with different bias/pressures, And of course if it will kick in at less pressure as well, it would be nice to know what the actual "cut off, throw code" pressure is
 
Old Apr 29, 2019 | 09:14 AM
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interesting idea, but if you change the pressure you are affecting brake bias as well. Right now the valve is set to limit the pressure in the smallest amount possible. Increasing the effect would decrease the flow, thus further decreasing the effectiveness of the rear brakes. Our cars are very front brake biased as they sit, so I would think that is a bad idea. That being said... tell me what you find.
 
Old Jul 23, 2019 | 02:27 PM
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just reviving this b/c i wanna do it myself...

where did you guys get the lines made? local hydraulic shops?
 
Old Jul 26, 2019 | 06:59 AM
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I just make the lines myself, still in our race season so have not been able to do the mod yet
 
Old Sep 16, 2019 | 10:44 AM
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this mod is all it's cracked up to be...easy and amazing.
 
Old May 6, 2020 | 09:41 AM
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well lines made and all done, we shall see if it works with my psm plugged in now
 

Last edited by DERBOOST; May 12, 2020 at 02:35 PM.
Old May 12, 2020 | 04:34 PM
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Got it all bled, now if the rain would stop i'll give her a try, looks like about a 15% reduction would duplicate the 25.3mm, if it will operate on less than that, better yet.
 
Old May 13, 2020 | 12:23 PM
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Test done, finally ZERO ISSUES, it all works exactly as it should, probably around 7-10 % does the trick and the PSM functions flawlessly with no warning lights all is good !!
 
Old Mar 20, 2022 | 04:45 PM
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Originally Posted by DERBOOST
Test done, finally ZERO ISSUES, it all works exactly as it should, probably around 7-10 % does the trick and the PSM functions flawlessly with no warning lights all is good !!
how are you getting on with this mod? I’m presuming that by putting the valve on you are limiting the flow back to somewhere near where it was with the standard master cylinder, it just takes less pedal travel to get there because the cylinder is larger?

is the valve placed on a line that feeds both front and back? Or is it just to either front or back? Just wondering if it alters bias too.

thx!
 
Old Mar 23, 2022 | 10:45 PM
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Anybody have a set of lines made for this? I have a 997 GT3 master cylinder that I was planning to use in a 987 but never got around to using.
 
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