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#4463961 - 07/19/17 12:56 PM Clutch slave cylinder restrictor
SHOZ Offline


Registered: 06/28/03
Posts: 5744
Loc: Illinois
Some discussion on one of my forums on the clutch slave cylinder for the Gen Coupe. There is a restriction on the actual cylinder at the fluid pipe entrance. The hole is 1mm.

Any thoughts on making it 2mm?

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#4463971 - 07/19/17 01:04 PM Re: Clutch slave cylinder restrictor [Re: SHOZ]
NStuart Offline


Registered: 12/28/16
Posts: 278
Loc: Sav ga
My 85 Jeep CJ had one on the master cylinder going to the rear line that I was told I had to remove for disc Brakes which I did
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#4463982 - 07/19/17 01:14 PM Re: Clutch slave cylinder restrictor [Re: SHOZ]
double vanos Offline


Registered: 08/05/04
Posts: 1884
Loc: 5600 feet elevation, Arizona
On a lot of the E46 forums many took that inline restrictor and simply threw it away, connect hose back up without it. No bad reactions , just better clutch actuation and feel. On GTI forums they pull the restrictor piece out and reassemble, same good outcome. I'd say drill it as big as you want....
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#4463992 - 07/19/17 01:23 PM Re: Clutch slave cylinder restrictor [Re: SHOZ]
Tman220 Offline


Registered: 09/20/16
Posts: 144
Loc: MN
The "Drill Mod" was also very common on 1998-2002 Camaro/Firebird for solving several issues and complaints.

The whole reason its there in the first place is to slow the fluid down to lessen drive-line shock in the event of a clutch drop.
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#4464012 - 07/19/17 01:34 PM Re: Clutch slave cylinder restrictor [Re: SHOZ]
SHOZ Offline


Registered: 06/28/03
Posts: 5744
Loc: Illinois
Well I guess I'll just take it out. The fitting that it is pressed against on the end of the pipe has a 3mm opening, the actual pipe is 3.5mm.

It is spring loaded and seems like it would act as a bypass on compression. Maybe it is working mostly when you let up on the clutch?
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#4464029 - 07/19/17 01:52 PM Re: Clutch slave cylinder restrictor [Re: SHOZ]
djb Offline


Registered: 01/16/06
Posts: 724
Loc: Los Gatos CA
Yes, a clutch line restriction is one way. It bypasses when you depress the pedal, only slowing the release of fluid. It limits driveline shock when dumping the clutch.

If you take it out, don't be an idiot, or loan your car to an idiot, or use valet parking.

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#4464035 - 07/19/17 01:55 PM Re: Clutch slave cylinder restrictor [Re: SHOZ]
aquariuscsm Offline


Registered: 12/30/06
Posts: 18150
Loc: Dallas,Tx USA
I wonder if my 300ZX has one of these restrictors on the slave?
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#4464144 - 07/19/17 03:57 PM Re: Clutch slave cylinder restrictor [Re: djb]
CR94 Offline


Registered: 03/20/16
Posts: 1120
Loc: Western S.C. since 1996
Originally Posted By: djb
Yes, a clutch line restriction is one way. It bypasses when you depress the pedal, only slowing the release of fluid. It limits driveline shock when dumping the clutch.
...
Interesting manifestation of big-brotherism. None of my manual cars had "clutch line restriction" (or any any sort of hydraulic clutch), or (in over 900K total miles) suffered from "driveline shock".
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#4464172 - 07/19/17 04:28 PM Re: Clutch slave cylinder restrictor [Re: SHOZ]
Dylan1303 Offline


Registered: 10/14/15
Posts: 177
Loc: Washington
My tiburon has one of those and a common mod is to take it out and throw it away.
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#4464175 - 07/19/17 04:31 PM Re: Clutch slave cylinder restrictor [Re: SHOZ]
mightymousetech Online   happy


Registered: 04/03/17
Posts: 1443
Loc: Ontario, Canada
Just about everybody with a BMW who is performance oriented just throws it out. So much better without it.
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#4464186 - 07/19/17 04:39 PM Re: Clutch slave cylinder restrictor [Re: SHOZ]
SHOZ Offline


Registered: 06/28/03
Posts: 5744
Loc: Illinois
This particular slave cylinder has no out line on it like normal for bleeding. I bet taking that restrictor out makes bleeding the clutch much easier.
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2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual

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