I've got a question about the 06 manual coupe. I realized that there is a delay in the shifting, when I let go of gas the car slowly idles down it seems like there is a delay in the shifting to me, I've also heard that the new M5's do this as well. My question is what is it? what did they do to the 06 coupe I've driven an 03, 04, and they don't have that same delay, Is it the camshafts? or something Electrical? any one have the same problem with an 06? any Ideas?

 

yea the idle does seem to drop strange on this car, i believe that mixed with our wacko clutch is the reason most people cant get smooth shifts out of this transmision. after about a week i figured out the art to our wierd tranny lol.

 

well I've changed the clutch, I put in an ACT Clutch same thing no difference...it's weird...

 

It could be a similar technology as the BMWs, where there is a vavle call the CDV which sits in the path of the slaver cylinder to the master cylinder, essentially this valve allows for same amount of pressure on every clutch input no matter how fast or slow you press and release the clutch. I know for sure they have it in all new bmws including the M series. So it's perhaps they also installed this feature on the new Coupe.

 

The M5 is an automatic so they aren't comparable. The delay is probably your driving style or somethign wrong with your specific car. You shouldn't have a shifting delay with a MT car.

 

thanks IvoryGT for the reply any ideas how to go about this and change it? or modify it? Should I even attempt to change it?

 

woah... u guys have me totally confused. are u talking about an automatic or a manual shifter? how can there be a delay in the shift in a manual car... when u, the human, is shifting. u guys aren't making any sense.

 

I am not talking about an automatic, I'm talking about a manual 06, when I let go of the gas or (thortle) the car has a delay in the idle, idleing down, I heard Infiniti and BMW did this for a smoother ride so that there is less jerking, my question was what could it be I'm thinking its the camshaft or something electronical. I wanted to know if anyone has had this problem or noticed it with their 06 and how to correct the problem.

 

M5 is NOT an automatic by any traditional means. It is a hydraulic actuated clutch system. It has all the manual parts, but controlled by computer to do the clutching and releasing. So if BMW really wanted to, they by all means could have installed a delay in the system to allow for "smoother" shifts.

Now this is just pure speculation, but on the BMWs the CDV looks like this



It would be in location before the slave cylinder in hydraulic line from the master cylinder.



On our cars on the 04 model, the piping looks like


So I imagine if there is a clutch delay valve, it will be somewhere in between.

Now is the hard part, to modify it, some suggested drilling the valve and enlarge the openning, however that will damage the valve and potentially fail underload. So you do find the valve, you could order 2 more and send it to zekhausen racing to have it modified properly.

http://www.zeckhausen.com/cdv.htm#Th...of%20Operation

 

PS. this sounds trivial, but check your carpet, sometime the carpet is too thick, preventing the clutch pedal to release properly, or the clutch could just be sticking. I suggest checking with infiniti first or go test drive another 06 see if it does the same thing.

 

Thanks IvoryGT for all your help it's greatly appreciated.

 

I'm actually curious to drive an 06 after this. I'd like to see what your talking about. My car has the JWT fly and UR pulley set so it drops back to idle like its going out of style, its also an 03. That would definatly weird me out on driving the car if the revs stay for a brief period of time before heading south.

 

Are you talking about the fact that the rpms like to hold for a split second before dropping when you clutch-in? I've always thought that was an attribute of the drive-by-wire system.

 

We have a Dual mass flywheel.

Takes longer to idle down when you let off the gas in neutral. If you get a lightened one, Revs will drop quicker and the car will be more responsive, but you'll also transmit a ton of engine vibes through the drivetrain and clutch pedal. You'll probably want to consider your drivetrain warranty toast if you get one, unless you have a really cool dealer.