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Suspension | Chassis | Brakes -- Sponsored by 949 Racing Relating to suspension, chassis, and brakes. Sponsored by 949 Racing. |
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08-19-2015, 05:51 PM | #1 |
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TESTED- Perrin Master Cylinder Brace
We had a spare analog input, a spare shock pot, a Perrin master cylinder brace, and some time to kill. Let's find out if it actually works!
First thing we did was mount a shock pot horizontally in line with the master cylinder: Interestingly enough, we had marginal deflection. On the order of a few thousandths of an inch. Watching it, we noticed the master cylinder was actually deflecting upwards, not forward like you'd think. It rotates around a point on the firewall, roughly, so that the end is pushed upwards. So we got a little creative with some machining measurement fixtures, and wound up with this: Despite the angle of the picture, the shock pot was perfectly vertical and in line with the front face of the master cylinder. Once we had that setup, we definitely recorded some deflection. The tests were performed with the engine off (no vacuum assist). The brake pedal was pressed several times at varying pressure. Brake line pressure was monitored via OBD2 at a resolution of 1 bar (14.7 psi), and the master cylinder deflection was measured via analog channel at a resolution of 0.001" (4 inch linear potentiometer at 12 bit resolution). You can see here, despite what may be a structurally inefficient position, it's absolutely effective, reducing master cylinder deflection by 57%. Could it be better? Maybe, but the returns would be minimal. You guys already know it improves feel, here's why. |
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08-20-2015, 09:49 AM | #2 |
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VERY Cool!! Thanks for the Info!
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08-20-2015, 01:39 PM | #3 |
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Practically every thread by you guys provides real data or at least truly useful information.
Thanks for taking such a comprehensive approach to developing the platform, and above all, sharing the results with us on a regular basis. If I had 10 posts to my name I'd just click thanks, but this probably gets my point across better anyway. |
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08-20-2015, 06:12 PM | #4 |
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This is awesome! Thank you so much for sharing!
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08-20-2015, 07:51 PM | #5 |
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that is total win.
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08-23-2015, 08:47 PM | #6 |
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The numbers don't lie! Thanks for making the test results available!
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08-24-2015, 01:49 PM | #7 |
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This is why I love this community. Great information
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08-27-2015, 08:34 PM | #8 |
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Awesome stuff. Thank you so much.
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08-07-2020, 03:23 AM | #9 |
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08-07-2020, 07:17 PM | #10 |
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08-07-2020, 08:09 PM | #11 |
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08-08-2020, 12:27 PM | #12 |
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