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Cleared 200 miles today - no CEL and no stored codes so far.
Throttle in sport mode with AC on full (105 Dallas heat) = touchy. You get used to it, but from a dead stop the throttle is now linear and sensitive meaning your immediate instinct is to back off when revs rise too rapidly (happened to me, too).
Thanks again Nexus-6, I agree you need to adjust a bit from a dead stop but the end result is all good.
J Cay asked if 0-60 time might be better and I would say yes what do you think ?
BTW I made a plastic cap that is .430 long with a .417 bore and it will slip over the pin and slightly press on to the switch body below and holds the switch in the depressed position and then there is no needed to tape or even take the switch out and with this cap you can do this mod in 20 seconds or less and reverse it the the same amount of time. The cap fits in a position so the part of clutch pedal that makes contact with the switch pin does not touch the cap so repeated clutch pedal operation will not effect the cap and it's funtion.
To show thanks to you for your post on this mod you may if you so choose send me a PM for one free cap.
1. With the mod, cruise still deactivates if you dip the clutch
2. I noticed that there is a red plug which fits into the back of the switch.
Instead of capping of taping the switch, if we disconnected the plug would that mean the car would think the clutch was always up or always floored?
1. With the mod, cruise still deactivates if you dip the clutch
2. I noticed that there is a red plug which fits into the back of the switch.
Instead of capping of taping the switch, if we disconnected the plug would that mean the car would think the clutch was always up or always floored?
Excellent news on the cruise feature still working. Hadn't gotten around to trying that.
I'm guessing that unplugging the switch, versus tricking it via tape (or caps) will throw a code for certain. With the circuit completed, even if it's not functioning correctly, it seems not to care. I'm guessing, though of course not 100% certain, that unplugging the switch = incomplete circuit = CEL or code.
How is the switch under the clutch involved with this? (I know this is a BMW...but how is ours different?)
Having owned 7 BMWs in the past several years, I've become rather familiar with the CDV method they employ (note that familiar and fond are very different things!). Defeating or removing it in each one meant a world of difference. In fact, with more than one it meant the difference between being able to drive without thinking about it (as all of us old fashioned manual lovers like to do) or constantly trying to avoid stalling the car or jerking shifts under normal driving conditions...devoting cycles to a process we would much rather take for granted.
Simply put, the BMW method (Clutch Delay Valve) is the mechanical way of doing what Porsche, Mazda and others are doing in software. The CDV is a narrow portion of the clutch fluid line, just before the slave. And by narrow, I mean it's a pin hole - what happens is that fluid is passed through here more slowly than it would in a proper size tube. This means that your input (clutch has been operated - all done!) isn't 1:1 with what's actually taking place. A fraction or two later, the clutch, now delayed by the slowly returning fluid in this narrow portion, engages the flywheel completely, but not at the moment you complete your portion of the equation.
I will say that a sloppy driver will find a CDV-less BMW very tricky to drive smoothly, especially if they had previously become accustomed to the "help" the CDV was providing. Smooth and experienced drivers will appreciate that the clutch pedal will actually directly modulate where the clutch disc is at in the operation. Most folks that defeat the CDV so they can actually shift quickly at redline without the slight (but measurable) delay the valve creates. In other words, folks often do it so they can chirp 2nd gear. Others (like myself) do it simply because our brains are wired from past years of driving to expect that the pedal on the left there directly modulates the clutch, and thus the smoothness of our uptakes post shift. To have it modified slightly puts our brains off just a bit. If you're the sort of person who loathes understeer, the CDV is the sort of thing that drives you bonkers. You want immediate, direct and expected results from your actions. Anything that interferes with or lags that, well...it bugs us is some deep ways.
I have no idea if Porsche involves more than just a software version of the clutch delay by employing that switch (they may use it for other things...as a feedback loop, it's a pretty solid example...to the switch, the clutch is either out, or in and this data could be used for other things I imagine).
I just tried this mod and I can tell you the difference is night and day....not dusk and dawn but night and day...especially in first...my foot and clutch now work in unison...before I thought - "now I know I haven't driven a manual in quite some time and that I was rusty", taping up this button I now think...hmmm my skills weren't so bad after all. I don't know whether to leave it or try to get used to Porsche's high revs to move out of first. Really what's the real harm...and why is this there in the first place.
In my opinion, the reason these measures even exists is to lengthen the life expectancy of the the clutch and drivetrain in general. If you can eek out another 15K miles before things need replacing (given that the clutch is a non-warranty item, but transmissions are covered and are quite pricey), well then you pad the bottom line a bit more.
In other words, I'm guessing that clutch delay devices in general are, foremost, pushed hard for by bean counters. The marketing is "smoother shifts!" but the reality is "less wear!" which means less $$ spent covering "blowed up" transmissions in the real world. And honestly, for most drivers it's not that noticeable so it makes the case pretty simple for car makers in general. Case in point = my wife. The only difference she detects is that the car is touchier from a stoplight. But she may drive the car, at most, 2/10s at her friskiest. For her, and for many, the difference is almost imperceptible. For me though, it was night and day...and got rid of the flatulence!
It's my understanding that you can more or less beat the living !@#!@ out of a BMW with CDV (high rev clutch dumps, power shifting, etc) and within reason, the CDV does a good enough job at protecting the clutch, flywheel, trans from shock that you can't really do much harm. Without it, that safety buffer isn't there to absorb the shock if you're brutal with the car.
My point in all of the above is that I don't believe there will be any harm whatsoever in disconnecting the switch (or defeating it) short to medium term for folks who don't abuse their cars. Long term (and by that I mean 75~100K miles) I can imagine more clutch and flywheel wear without the switch operating, but for me, that's of no concern as I doubt that my 987 will ever see more than 40K during my ownership. If it does throw a CEL or store a code at some point, that could be a nuisance to deal with, but it's a simple task to erase it - and, touch wood, she hasn't thrown any codes in 200 miles as of this evening. If anyone is concerned about warranty work, you can always remove the tape (or cap as Elmo has devised) and you'll be back to normal in less time than it took me to type this sentence. Of course it should be stated that I might be talking directly out my rear end here as I'm not an engineer for Porsche, but I'm relatively confident that it's the same line of thinking as BMW and others (extend the life expectancy of certain expensive to replace/fix parts).
The comparison to variable rate steering is spot on - I had to fight tooth and nail with my sales guy a few years ago as to why I didn't want it on my 335i, and felt oddly out of place defending my preference for direct and precise interactions, sans assistance. He finally let up when I used the (lame) statement "It's the ultimate driving machine, right? When did they begin selling the ultimate parking machines?"
