1G DSM Wildwood clutch master cylinder conversion kit!
The OEM setup works fine for the OEM clutch, but often struggles to adequately release a heavier pressure plate. Often the heavier pressure plate requires more TOB travel to get full release. The Wildwood slave is larger diameter and offers a longer piston travel resulting in more fluid displacement. The end result is more TOB travel, and better clutch release. Kit includes adaptor, Wildwood master, heavy duty clevis, stainless hardware, and clutch line adaptor. We typically recommend using this with our long travel pedal mods and a large bore slave, however this is a drastic improvement over the stock slave if your pedals are already welded - We reccomend a 0.700" bore master and stock 0.750" slave cylinder in those cases, however it will increase pedal pressure.
Installation requires basic hand tools and a thin wall 12mm socket. The master does stick out roughly 1.5" further than stock, and may be an issue with large plenum intakes. We have no clearance issues with Evo3, dejon tool smim or a billet runner jmf race.
This is a professional level installation part, and is not for amateurs - many shops will not have the experience to properly setup this part. The installer will need to verify proper installation and potentially "tune" the setup to maximize the results. We recommend that this is only used with a solid hub clutch disc. Incorrect setup has the ability to damage the clutch, and even cause crank walk. However if one takes the time to ensure it is setup this can GREATLY improve the clutch operation in these cars and results in much improved high rpm shifting. We include setup notes with the kit, but cannot offer tech support.
. Master and slave selection: It is important to remember “work in = work out”. “Work in” is the pedal pressure X foot travel. “Work out” is pressure plate clamp x release distance. If you increase the pressure plate load your pedal pressure will go up, all else equal. If you increase the release travel your pedal pressure will go up. If you increase foot travel your pedal pressure will go DOWN. Keep in mind this is very simplified, there are losses and deflection that are beyond the scope of this simple analysis.
We have a ~40:1 leverage ratio from the pedal to the pressure plate (not the fingers). The more leverage the less pedal pressure, and the less pressure plate travel.
Increasing the master cylinder bore reduces the leverage ratio.
Increasing the slave cylinder bore increases the leverage ratio.
Increasing leverage ratio reduces pedal pressure and reduces release travel.
If we want to increase release travel, we either need to reduce the leverage ratio, or increase foot travel.
In general, I recommend 0.050” of release clearance to be sure the clutch can release well. There is also another ~0.050” required to get to the start of release. That is a total of 0.100” release travel or pressure plate movement at 2600lbs. That’s 260in*lbs of work. That means if your foot travels the factory 4” that is 65lbs force.
If we increase the pedal movement to 6”, we have now reduced the pedal pressure to 43lbs.
The turbo 1G DSM came with a 0.625” master cylinder and a 0.750” slave cylinder. I recommend going to a 0.700” master, and a 0.812” slave from a 1GN/T or a 2G. This would be a very small increase in leverage ratio (pedal pressure), and the longer foot travel will get more release distance as well.
A smaller stock 1G Turbo slave may be needed if you can not raise your clutch pedal high enough to get enough travel.
If you have a very light clutch or a clutch that requires very little release travel such as 7.25" twin disc you may want to go with the 0.625 master.
In either case an additional master is available for around $90.
These kits are put together as ordered and may take 2 weeks to ship.