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      06-15-2007, 09:31 AM   #1
Waldorf
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2nd gear grinding

has anyone had a case of chronic grinding in 2nd?

when i test drove an M Roadster i got the 2nd to grind a few times unexpectedly. I'm a very experienced track driver, i don't grind gears. I thought that maybe the poor little M Roadster demo had been abused by a bunch of idiots.

now i've had my M Coupe for about two weeks and 1900 Km and got the grinding 2nd four times. WTH?

anyone?
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      06-15-2007, 09:43 AM   #2
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Waldorf, check your PM box...
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      06-15-2007, 10:08 AM   #3
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Quote:
Originally Posted by Waldorf View Post
has anyone had a case of chronic grinding in 2nd?

when i test drove an M Roadster i got the 2nd to grind a few times unexpectedly. I'm a very experienced track driver, i don't grind gears. I thought that maybe the poor little M Roadster demo had been abused by a bunch of idiots.

now i've had my M Coupe for about two weeks and 1900 Km and got the grinding 2nd four times. WTH?

anyone?
Its because the clutch takeup is so close to the floor - you need to be very percise in the M cars on the timing of the hand and foot work between 1 & 2. Its just not intuitive imo. The long clutch travel and short throw shifter seems to throw timing off too... You're not alone.
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      06-15-2007, 10:12 AM   #4
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X2. The first time sounded devastating!
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      06-15-2007, 10:38 AM   #5
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alright, thanks for the info. it's almost time for lunch so i'll try it soon.
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      06-15-2007, 10:44 AM   #6
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Yeah...2nd is the most challenging to get into.
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      06-15-2007, 10:52 AM   #7
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I'm just gonna be a prick and say its the driver, not the car.
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      06-15-2007, 01:00 PM   #8
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It's not just the M's, it took me a while to figure out the 1>2 in the Zed.

The key is to shift like you do on a bike; pre-load the shift lever while still applying power in 1st and then allow the clutch disengagement to allow the shift. If power is still on, you can put a good deal of rearward pressure on the lever without it coming out of 1st. This results in a quicker, smoother shift without the risk of having the pedal coming off the floor while the lever is still travelling. Unless I'm just poking around town, I now pre-load all of my shifts.
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      06-15-2007, 03:44 PM   #9
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Quote:
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I'm just gonna be a prick and say its the driver, not the car.
What would you know with your automatic
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      06-15-2007, 03:47 PM   #10
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I did it a few times too - in the beginning. I Coupe has never had that happen since I practiced on the first one
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      06-15-2007, 03:57 PM   #11
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What would you know with your automatic
Who said mine is an automatic? 6spd manual, thank you.
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      06-15-2007, 04:24 PM   #12
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It's true tho...if your accelerating fast and your body is being thrown backward and you're trying to kick the clutch while you're also trying to shift quickly it can be a difficult proposition. You know what they say...practice makes perfect.
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      06-15-2007, 05:59 PM   #13
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Quote:
Originally Posted by Waldorf View Post
has anyone had a case of chronic grinding in 2nd?

when i test drove an M Roadster i got the 2nd to grind a few times unexpectedly. I'm a very experienced track driver, i don't grind gears. I thought that maybe the poor little M Roadster demo had been abused by a bunch of idiots.

now i've had my M Coupe for about two weeks and 1900 Km and got the grinding 2nd four times. WTH?

anyone?
Yea,it happened to me a couple of times when i first got my car.

1)You can try to sit closer to the steering wheel and firewall.

2)Get a clutch stop to shorten the travel of clutch.

3)It is less likely to happen again when you got some miles on the car(after you get familiar with you car) .

The transmission will also "loose up" a little bit after some good track days

My car is super smooth right now compared to when it is new.
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      06-15-2007, 06:41 PM   #14
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I don't think the clutch stop would help - it doesn't change the engagement point. If anything, it might make it worse if it inhibits full disengagement of the clutch...

Do M's have the CDV thingy? I removed mine on the 3.0i and it made a world of difference.
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      06-15-2007, 06:59 PM   #15
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Yeah...we have the CDV thingy
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      06-15-2007, 07:06 PM   #16
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What I don't get is if this thing is so bad...what's the reason for putting it in there...

http://www.zeckhausen.com/CDV.htm
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      06-15-2007, 09:11 PM   #17
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I don't really have any problem with 2nd...

I have the CDV deleted... but don't see what that has to do with gear engagement.
It wasn't any different before CDV delete, other than the box was still breaking in.

2nd is a little tougher to engage when downshifting....
but a shorter gear is always harder to engage.
I def don't get any grinding...
Occasionally, I'll get a little *snik* if my timing is a little off.
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      06-15-2007, 09:32 PM   #18
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Quote:
Originally Posted by Godspeed View Post
I don't think the clutch stop would help - it doesn't change the engagement point. If anything, it might make it worse if it inhibits full disengagement of the clutch...

Do M's have the CDV thingy? I removed mine on the 3.0i and it made a world of difference.
I forgot mention that i had the CDV removed too.That helps a little bit,but not much.

However,I think my gear changing is much smoother after some track days.

It might be the car or me getting better with rev match and H/T.
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      06-16-2007, 09:24 AM   #19
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Quote:
Originally Posted by inTgr8r View Post
I don't really have any problem with 2nd...

I have the CDV deleted... but don't see what that has to do with gear engagement.
It wasn't any different before CDV delete, other than the box was still breaking in.

2nd is a little tougher to engage when downshifting....
but a shorter gear is always harder to engage.
I def don't get any grinding...
Occasionally, I'll get a little *snik* if my timing is a little off.
Make sure you don't forget to give it a lil RPMs in your downshift. I've got no worries there. Every now and then during hard acceleration it can be a challenge tho...gotta keep that clutch in!
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      06-17-2007, 12:36 AM   #20
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i just got my z4 3.0 and i get a loud thud sometimes when i shift into 2nd..
also it seems 1st gear is really short and i need to shift inot 2nd really soon..
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      06-17-2007, 07:26 AM   #21
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I agree with InTgr8r
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      06-17-2007, 08:59 AM   #22
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Quote:
Originally Posted by em2b96p View Post
i just got my z4 3.0 and i get a loud thud sometimes when i shift into 2nd..
also it seems 1st gear is really short and i need to shift inot 2nd really soon..
1st gears usually are...when I'm in traffic or not in the mood to accelrate hard...i usually just use 1st to get goin and do most of the accelerating in 2nd.
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