Anyone Else Mod Their Clutch Delay Switch?

[smackboy1]

Has anybody else modded their clutch delay switch? I just read this on Cayman Club

http://www.caymanclub.net/cayman-modificat...feated-joy.html

I just tried it out and WOW :D 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.

Edited September 12, 2008 by smackboy1

[Tool Pants]

I read that before but did not think it had any application on a 996/986.

[smackboy1]

It's defintely on my 996. It seems to be on Caymans and 997. Don't know about the Boxters but I would imagine it would be the same.

[Loren]

I do not think the cruise control clutch microswitch does anything to the DME program - other than turn off the cruise when the clutch is engaged. I've looked at the schematics and there is no direct connection - which means it could still be a CAN signal but that is all that it is "on" or "off".

[tholyoak]

I don't know if the DME uses the clutch switch for anything other than cruise functions but it may. The DME does get the clutch switch signal from the cluster via the CAN bus. If you leave this switch bridged closed you will get a P0830 error and the cruise control will be disabled. In my opinion there is no reason to do this 'modification'

-Todd

[cecil_t]

I just unplugged the upper switch on the clutch and didn't really notice any difference on my 997. After a couple of miles driving I did get a check engine light with the message "drive-off assistance failure" or something like that. I guess that switch is used at least for that feature (it's the hill-hold feature when starting from a stop on an incline). I plugged the switch back in and the error went away and I did some more hard starts and hard shifts and didn't notice any appreciable difference in power. So if it is delaying the timing or changing the engine map to make less power after a shift on the 997 it's really subtle.