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YOUR RESEARCHAnyone Else Mod Their Clutch Delay Switch?
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clutch delay switch causing a throttle lag
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Suspected cause · Original poster
I think a more likely culprit is the clutch delay switch causing a throttle lag which coincidentally happens to end when I reach around 3,000 rpm.
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Suggestion · Original poster
This may replace the orange cap as the Best Bang for the Buck Mod.
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Suggestion
BMWs (expect M models) use a clutch delay to make the cars easier to drive / harder to stall.
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Has anybody else modded their clutch delay switch? I just read this on Cayman Club
http://www.caymanclub.net/cayman-mod...eated-joy.html
I just tried it out and WOW
what a difference. The throttle pedal is now much more sensitive off the line and after shifts. Power after an upshift is much more immediately available. Heel-toe downshifts are much easier because I don't have to blip the throttle as deeply to get the revs up.
I don't know exactly what the clutch delay switch does, but it feels like it modifies the throttle map (makes it less sensitive) so you have to push the throttle pedal deeper to get increase the throttle while the delay is in effect. Since I got the 996 I've noticed a "turbo-lag-like" effect where upon a standing start, the engine will surge a little at around 3,000 rpm. I used to think that was the Variocam Plus kicking in. Now I am rethinking that theory. I think a more likely culprit is the clutch delay switch causing a throttle lag which coincidentally happens to end when I reach around 3,000 rpm.
Interesting.
It takes literally 5 minutes to do. The easiest way to do it is to give the switch a 1/4 twist and remove it from the bracket. Then either tape or rubber band the switch plunger down so the sensor thinks the clutch pedal is permanently in the up position. Then just move it up and out of the way. The hardest part is contorting your body in the footwell with a light.
This may replace the orange cap as the Best Bang for the Buck Mod.
Not this one, this is a burnt orange color, twists out (I didnt need a light), quick tape up and fold it up in the wires..
Personally I tried it for about an hour and realized that after "learning" to shift this car over the last few months, I no longer wish it was "normal"... I switched back, simple enough to test if you like it....
Ed
Won't this disable your cruise control? The starter interlock switch is a different one that is triggered when the clutch pedal hits the floor, not when it is initially depressed.
no... this wont dis-able the CC cause it thinks the clutch pedal is always up.... it however, will not dis-able your CC if you have it enabled and step on the clutch.... the brakes will dis-able it though.
I actually dont like the extra response at the track.... Im much smoother with the throttle when it is dampened a bit. I find my gas pedal to touchy for my taste. But Ithink this mod may only be good from 1st to 2nd gear... so it will not impact so much at the track. I like the helper spring mod for clutch feel.... But Im sure I have to try this mod out one day since its so easy....
Thanks for the info...
2 different switches but mounted on the same bracket. If you look at this photo someone posted of their Cayman clutch you can see the grey micro switch in the middle, which activates the starter circuit when the clutch is fully depressed. This is the click that is heard when the clutch pedal is fully depressed. The orange plug is the clutch delay switch. It makes no sound and the plunger switch is pushed in when the clutch pedal is not depressed. This photo was taken looking straight up under the dash. The clutch pedal itself would be extending out at the bottom of the photo.
The new throttle feel definitely takes a little getting used to. Without the delay the throttle feel is more linear and the power comes on more quickly. The tradeoff is the sensitivity can make shifts jerky and make it harder to maneuver small distances at slow speed e.g. parallel parking into a tight spot on a hill.
It's not really a "Clutch Delay Switch". A "Clutch Delay" would slow the release of the clutch, and it's usually a mechanical device like a manifold with a fixed orifice to slow the flow of hyrdaulic fluid from the cluch slave cylinder. BMWs (expect M models) use a clutch delay to make the cars easier to drive / harder to stall.
The switch you're talking about does one thing for several reason, one of them overlaping the benefits of a clutch delay. It retards the timing when you press the clutch, and for a short time after the clutch has been released.
1. Retarding the timing reduces shift jerk which makes shifts smoother, but more importantly protects the Dual Mass Flywheel from damage.
2. During take offs, retarding the timing reduces the chances of knock/ping on clutch release. This makes it much easier to launch without stalling (the overlap I was taking about).
3. By knowing when the clutch is being depressed, the DME can widen the range of acceptability in it's misfire detection module.
Here's a quote directly from the Porsche Tech archives: "The program that evaluates misfire is complex. it has to be able to distinguish between deceleration caused by rough roads, potholes,
shifting
, and other non misfire causes, and deceleration caused by misfire."
4. By knowing then the car is shifted (watching the clutch), the Torque Control can reduce engine braking during high torque downshifts.
Here's another quote from the archives: "On deceleration with unacceptably high engine braking when downshifting, engine drag torque control (MSR) prevents the drive wheels from locking on a slippery road by slightly opening the throttle valve."
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.
