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Mustang Forums
2011-2014 Mustangs
Driveline/Suspension
Still can't shift at WOT after JHR clutch line...
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<blockquote data-quote="Shaun@AED" data-source="post: 11823350" data-attributes="member: 32381"><p>I've also had similar problems and have come to the conclusion we are boiling the clutch fluid.</p><p></p><p>The clutch/pressure plate heats up the slave cylinder and boils the fluid in the slave. Once that happens there is not enough fluid pressure to release the clutch.</p><p>The larger orifice clutch lines allow more fluid thru vs clutch pedal travel, but it does not solve the problem. It's a bad-aid at best IMO.</p><p></p><p>Depending on the DOT4 fluid used vs DOT3 you will raise the boiling point ~100 degrees, again not enough as I have already swapped out the DOT3 for DOT4 (475 degree boiling point) and still have issues.</p><p></p><p>Best I can do is pump the clutch like crazy after a burnout (fluid boils during burnout) and I can nail 3 gear changes with slicks dropping the hammer. If I was on DR's slipping the clutch, I doubt I'd be able to nail even the first gear change.</p><p></p><p>Once the rest of my new brake setup gets here I'll be doing another fluid swap, and even have a remote clutch reservior ready to install if needed.</p><p></p><p>Tilton makes TSR-1 brake fluid which is labeled as DOT4 and compatible with conventional DOT3/4, but it boils at 622 degrees! I'll be swapping the entire brake/clutch system over to TSR-1 fluid before the next track outing.</p><p></p><p>IMO this is yet another band-aid. The proper fix would be a Slave that is insulated from the heat of the clutch/pressure plate.</p></blockquote><p></p>
[QUOTE="Shaun@AED, post: 11823350, member: 32381"] I've also had similar problems and have come to the conclusion we are boiling the clutch fluid. The clutch/pressure plate heats up the slave cylinder and boils the fluid in the slave. Once that happens there is not enough fluid pressure to release the clutch. The larger orifice clutch lines allow more fluid thru vs clutch pedal travel, but it does not solve the problem. It's a bad-aid at best IMO. Depending on the DOT4 fluid used vs DOT3 you will raise the boiling point ~100 degrees, again not enough as I have already swapped out the DOT3 for DOT4 (475 degree boiling point) and still have issues. Best I can do is pump the clutch like crazy after a burnout (fluid boils during burnout) and I can nail 3 gear changes with slicks dropping the hammer. If I was on DR's slipping the clutch, I doubt I'd be able to nail even the first gear change. Once the rest of my new brake setup gets here I'll be doing another fluid swap, and even have a remote clutch reservior ready to install if needed. Tilton makes TSR-1 brake fluid which is labeled as DOT4 and compatible with conventional DOT3/4, but it boils at 622 degrees! I'll be swapping the entire brake/clutch system over to TSR-1 fluid before the next track outing. IMO this is yet another band-aid. The proper fix would be a Slave that is insulated from the heat of the clutch/pressure plate. [/QUOTE]
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2011-2014 Mustangs
Driveline/Suspension
Still can't shift at WOT after JHR clutch line...
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