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Old 11-18-2009, 03:24 PM   #1
PorKen
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Default Adjustable clutch stop

I wondered why this was missing from my '85 when I bought it. Most other manual transmission cars I've seen from other OEMs have them.

Lets you know where the clutch is totally disengaged, instead of just pushing all the way to the floor 'just in case'. Adjust it with a lot of room for feathering, or closer for faster shifting ('85-up ) from less time spent disengaging/engaging the clutch. I'm able to sit a bit farther away from the steering wheel now that I don't have to push to the floor.

It appears that single disk clutches ('87-'95) need a lot less throw to disengage compared to the doubles ('78-'86), and can have a lot of dead space taken out.

I reckon it would be ideal for Colin's new Super Shifter.

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Old 11-19-2009, 02:11 PM   #2
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Quote:
Originally Posted by PorKen View Post
I wondered why this was missing from my '85 when I bought it. Most other manual transmission cars I've seen from other OEMs have them.
What is the "them" you are referring to? Is it the rubber bumper to the right of the boot near the center of the pic? Can't tell from the parallax what will hit that bumper, if that is what it actually is.
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Old 11-19-2009, 04:56 PM   #3
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'Them' is the rubber bumper/clutch stop. The clutch arm hits the center of the bumper about 3" above the pedal.

You can see the worn area where the clutch arm hits the carpet at full extension on my '85. (Early clutch arms have a cast metal stop behind the pedal which hits the carpet, later (S4?) arms don't have this stop.)
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Old 11-19-2009, 04:56 PM   #4
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Along with my clutch stop, I'm going to get a factory spacer for the pedal, too, so I can sit farther away from the steering wheel with my shortish (for my height) legs and long arms.

The spacers are 15mm thick and bolt directly on the clutch or manual brake pedals using an existing threaded hole in the pedal, after removing the pedal pad. The pad then fits over the spacer. You can double them up for 30mm.

928 423 207 00 - spacer (~$35, still available from Porsche)

Last edited by PorKen; 11-28-2009 at 06:52 PM.
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Old 11-20-2009, 11:11 AM   #5
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Is that stop something that you're selling - if so, I'm buying.
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Old 11-20-2009, 02:18 PM   #6
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This will be perfect for the track project - thanks.
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Old 11-25-2009, 05:16 PM   #7
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Nice find on the spacers, Ken! I put a spacer on my steering wheel, and now its too close to my chest when I can reach the pedals- so the pedal spacers will make nice adjustment for perfect fit.
I will probly order the stoop from you soon as well...

Steve
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Old 11-28-2009, 06:50 PM   #8
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I was wrong, the spacers are 15mm, which you can double up to 30mm. (Corrected above.)

Works great, and is perfect with my clutchstop. I wasn't able to move the seat back, but I was able to raise the front of the seat up to the max, which puts my shoulders farther back, so I'm comfy, now.


FYI: Roger checked, Porsche says there are ~170 in stock. There used to be a automatic brake pedal sized version, but that is NLA.

vertical pedal adjustment
brake pedal
clutch pedal
15 MM

928 423 207 00 spacer plate
900 067 057 02 pan-head screw M8 X 20
N 042 131 1 shake-proof washer

30MM

900 067 081 02 pan-head screw M8 X 35


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Old 11-29-2009, 06:56 AM   #9
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Ken,

I think I read about cases where people were clutching too hard and the top of the clutch pedal arm itself actually cracked. Will this put more strain on any of the arm if people clutch to the stop and keep pushing?

Not trying to knock your design, you know I'm one of your biggest fans, I'm just curious.
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Old 11-29-2009, 12:32 PM   #10
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IIRC, that was with very early clutch arms. They may have been designed to break like that in a crash. They cracked at the top, AFAIK.

The rubber buffer is a little squishy, and the stop bracket purposely has some spring in it. Normally, you don't hit the stop at full force, and the hydraulic clutch action slows you down anyway.

I was worried when designing the stop bracket that it wouldn't be beefy enough. In testing though, I found that you can't hit it very hard, and it didn't take much to stop the pedal.
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Old 11-29-2009, 02:42 PM   #11
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Quote:
Originally Posted by PorKen View Post
IIRC, that was with very early clutch arms. They may have been designed to break like that in a crash. They cracked at the top, AFAIK.

The rubber buffer is a little squishy, and the stop bracket purposely has some spring in it. Normally, you don't hit the stop at full force, and the hydraulic clutch action slows you down anyway.

I was worried when designing the stop bracket that it wouldn't be beefy enough. In testing though, I found that you can't hit it very hard, and it didn't take much to stop the pedal.
Ah, gotcha. Thanks.

Yeah I couldn't understand how that happened anyway, I mean we're all taught to clutch 'all the way' but once you've driven for a while you certainly develop a feel for it and you don't need to slam it down with full force.
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Old 12-02-2009, 11:44 AM   #12
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It's the 78-80 pedal that's weak, 928 423 313 00. 81-up have a sturdier design.

You can buy a slightly used one, (here):
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Old 12-08-2009, 12:09 PM   #13
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My 82 had that hollow one on it and broke right at the weld. I Picked up a nice solid one from 928intl.
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Old 01-26-2010, 12:09 AM   #14
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Thumbs up Install - S4

I had a few minutes this evening to install Ken's PorKultch'r :
  1. Remove 2 13mm bolts and plate
  2. S4's have spacers under the stock plate, retain these. Not sure of pre/post S4's
  3. Undo circlip and washer on the clutch rod and the pedal and remove rod
  4. Be careful of the clutch pedal with the clutch assist spring..basically it's a great finger cracker w/o the clutch rod
  5. Fit the new bracket with spacer, bolts and washers. I started with 1 cm of adjustment. Use a small 10mm wrench (spanner) to tighten the stop nut once desired stop is achieved.
  6. Tighten to 17 ft/lbs and reconnect clutch rod
Done 8 minutes total. Will post up more on driving tomorrow.
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Old 01-26-2010, 12:23 PM   #15
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Nice pics, Stefan!

The spacers are there to get through the insulation/sound deadening. What happened to your SD/carpet? It makes for good install pics, though!


[2] '78-'95 all have the same spacers, and trim plate.

[3][4] It's a good time to verify the clutch pedal adjustments. (Note the difference in measurement '92+.)

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