04-02-2008, 04:42 AM
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EVO X Wizard
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Join Date: Mar 2008
Posts: 84
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EVO 8 - 9 Braided Clutch Line / Restrictor Removal - HOW TO ARTICLE
As most DSM owners already know, Mitsubishi utilizes a section of rubber hose to connect the clutch master cylinder to the release cylinder. While the flexible nature is necessary to allow movement with engine torque (which is why it can't be replaced simply with hard brake line), it also expands under pressure, which causes inconsistent clutch engagement.
To combat this issue, we replace the stock rubber hose with a braided stainless steel line that will flex with the engine, but does not expand under pressure.
Since the clutch line will need to be bled anyway, we also highly recommend removing the clutch restrictor at the same time. The restrictor is the same as in the 95-99 DSMs: a small plate with a hole in the middle, attached to a spring.
This restrictor slows the fluid movement to the release cylinder to make for smoother clutch engagement/disengagement....or possibly just to help avoid too much drive train warranty work from hard AWD launches.
In either case, quick, solid clutch engagement is nearly impossible with the restriction of the fluid and its removal causes absolutely no noticeable loss of drivability. Those concerned about removing it due the possibility of it causing "driveline problems" should be made aware that removal of the restrictor has been done for nearly 9 years on 2G DSMs with zero consequence.
In fact, even heavy duty AWD DSM clutches like the ACT 2600 have been known to still slip if the restrictor is left in, so unless you consider more consistent 60 foot times and more solid clutch engagement a "driveline problem", it's removal should be of little or no concern.
By upgrading the clutch line or removing the restrictor, clutch engagement will be more direct and more consistent. Obviously, it best is to do both for maximum improvement and daily driving will suffer 0%
EVO 8 - 9 Braided Clutch Line / Restrictor Removal - HOW TO ARTICLE
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