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E89 Z4 (2009 - current)

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  #1  
Old 03-28-2014, 05:33 PM
heckingbottom heckingbottom is offline
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Location: Leeds
 
Join Date: Jan 2014
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Mein Auto: Z4
New Owner Issue

I'm absolutely delighted to be a new owner of a 2010 SDrive E25i M Sport.

I love the look of car but have real issues with how to change gear smoothly. Setting off from start is really difficult. I've tried low revs and higher revs but it doesn't seem to get going very smartly. 1st gear to 2nd gear is really difficult to change through smoothly. I seem to hold back on accelerating in 2nd to ensure that I'm in that gear before I go for it on the gas. If I go for it early, its really jerky and uncomfortable. 2nd to 3rd is better and I have no problems further on.

I would add that I do think the car has a fault and I need to go back to the dealers because the acceleration from lower revs is not at all smooth. It seems to lack power in the lower revs, stutter a bit and only pick up strongly at 3500rpm. Below this it is quite lethargic.

Some years ago, I bought one of the new Audi TTs and I think this was much faster and punchier than the 2.5l Z4. Have I bought a dud?
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  #2  
Old 03-29-2014, 06:17 PM
jparnes1 jparnes1 is offline
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Location: Rochester, NY
 
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Mein Auto: 2011 Z4 35i, 2006 525xi
Is this your first manual transmission? If so, just practice. If not, it could be that smoother shifting will come as the gear box breaks in. I definitely notice that shifting is not as smooth when the engine is cold and I'm more "delicate" with my shifting until it warms up some. I'd give it a little more time before you bring it in.
As far a performance is concerned, you should have plenty of juice at low revs. Max torque is reached at 1500. That may be an issue worth investigating.
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  #3  
Old 03-31-2014, 06:50 PM
ZooMigo ZooMigo is offline
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Location: Colorado
 
Join Date: Aug 2013
Posts: 11
Mein Auto: 2014 Z4 28i
I had a bunch of trouble getting good shifts on my zed when I first picked it up. Did a bunch of reading including the clutch dampening vale. Turns out I was out of practice. In the end, I have to rev a little higher than I'm used to, but now have nice smooth shifts.


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  #4  
Old 03-31-2014, 07:27 PM
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HerrK HerrK is offline
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Join Date: Jan 2010
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Mein Auto: 2011 Z4 35i
Quote:
Originally Posted by heckingbottom View Post
I'm absolutely delighted to be a new owner of a 2010 SDrive E25i M Sport.

I love the look of car but have real issues with how to change gear smoothly. Setting off from start is really difficult. I've tried low revs and higher revs but it doesn't seem to get going very smartly. 1st gear to 2nd gear is really difficult to change through smoothly. I seem to hold back on accelerating in 2nd to ensure that I'm in that gear before I go for it on the gas. If I go for it early, its really jerky and uncomfortable. 2nd to 3rd is better and I have no problems further on.
I found the vehicle much easier to drive, especially the 1-2 & 2-3 after I ditched the Clutch Delay Valve (CDV) which is basically an orifice in the line leading to the slave unit which as the name implies, delays the clutch engagement in a controlled manner, no matter how fast you lift your left foot.

It is relatively easy to do a CDV'ectomy. I purchased a spare CDV (about $8) and removed the orifice mechanism, which is merely a screen, ball valve and plastic plug.

1. Pinched off the rubber line leading to the CDV to limit the fluid loss.
2. R&R the CDV with the unorificed CDV.
3. Release the pinch point.
4. Bleed the slave unit.
5. Top off the master cylinder.

Total wheels up to wheels down is about a 90 min DIY if you are competent and feel comfortable messing with the hydraulics.

Normal driving no real difference as you are gradually easing out the clutch anyways. Much quicker clutch lockup during spirited upshifts.

If you are not so mechanically inclined or prefer to have someone else (your local independent shop) do the work, you can buy a modified (orifice less) CDV from Zeckhausen Racing (link below) for about $50 with shipping and replacement CDV included. Probably another $120 shop time for your local independent shop to R&R and bleed the system. FYI - Our E89 Z4's use the same CDV's as the E90 3'ers (PN 21526764872)
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