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Clutch Delay Switch

Richard_Hamilton

Richard_Hamilton

PCGB Member
Member
I thought the clutch switch was just for the starter interlock and cruise control. Do you have cruise, and does it still work?
 
There are two, this one just pulls a load of timing for two seconds after the clutch is actuated. You must try it, its quite a transformation.
 
Just removed and jumpered my clutch delay switch and what a difference!

My E90 had a valve in the clutch line which I removed to good effect but the mod on the Porsche was so simple.

The car is now a pleasure to drive, gear changes are sweeter with no initial stumbling, recommended!

CDSWITCH.JPG
 
Bit of a follow up, I've just taken the car out for another spin and can't believe the difference, it feels almost lighter, certainly more responsive, needs an lsd now.. I have retrofitted cruise so tested that on the motorway and its working perfectly.
 
Seems it's not all good news So by removing that switch, you may in fact feel some added sharpness to throttle response when shifting. Because now you have a sharper timing curve. But you will be castrating all 4 of the benefits mentioned above. To summarize: 1. You may experience premature failure of your DMF 2. You may find yourself stalling your car more frequently, and you may find that your car has less power than before, because when it preignites - the DME is going to pull the timing back and keep it back for a while. 3. You may experience a Check Engine Light, and investigation may reveal random misfire codes. 4. You may notice locking of the rear wheels after high RPM downshifts. This is most likely to be noticed on slippery surfaces like rain or snow, and it is likely to cause oversteer.
 
You should make it clear that the points you have made are of course purely speculation and have not been seen in actual application.
 
I can't get my head round this. There are two separate single-pole switches on the clutch pedal. The clutch interlock switch is at the bottom of the pedal travel, and is connected to the DME. It can't be this switch which alters the timing, as I never press the pedal that far in normal use. The other switch is at the top of the pedal movement, and is connected to the instrument cluster. I can't see how you can by-pass this switch, and have the cruise disengage when you press the pedal. Sure, the cruise will work, but it is disabling this safety feature. The only thing that now makes sense to me now is why I get an error code in the DME when I do clutchless changes.
 
It's amazing really ... Porsche spend all that money on R&D and still miss that fact that you can improve the whole thing with two spade connectors and an inch of wire! Sorry ... not convinced! [&:]
 
LOL, well I'm waiting for Richard to try it so we'll see. As for millions in R&D, an awful lot of it is spent on achieving a compromise and meeting EU regs, some of the easiest modifications are removing those compromises. Take the exhaust for example, the secondary cats can be removed improving the efficiency of the engine resulting in more power and improved MPG. Another example in the exhaust again, the pipework directs the pulses directly at each other before the tailpipe, hardly an efficient design despite the millions in R&D. I remember when the Mk3 MX5 was introduced, to meet EU regs they just slapped some longer suspension springs on the car without adjusting the geo, a simple mod was fitting some Eibachs and having a geo to turn the car in to what it should have been. I'm not posting to try to convince you either, I'm just enjoying my car and sharing what I do along the way, am I on the wrong forum?
 
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