Questions for other 2.5i manual owners

[Tuna!]

What RPM do you switch from 1st to 2nd?

I really don’t like 1st because its so damn jerky and slow if i have the slightest roll i can start or shift in 2nd. Usually switch from 1st to 2nd at around 2k rpm maybe sometimes slightly lower. But I feel a lot of times I have a big pause in movement while shifting 1-2 that would probably be solved by shifting later in 1st.

I am new to manual and haven’t had any teacher or given any advice. Not sure if I am doing anything wrong just doing what feels smooth to me.

Also what is the lowest rpm you stay in 5th?

I love the car but I really wish there was a 6th gear lol. It’s tons of fun but feels like the gears are all really close to each other then just revs out the rest of the way.

 

[Zedebee]

Don’t listen to me as I drive an auto these days, but this is a sports car and should be driven a bit harder than changing up at 2k.

Also, removing the clutch delay valve improves the gear change for most people. Search for CDV on here for members’ experiences.

 

[Tuna!]

Ya i just tried reving out 1st and it smoothed everything out. I’m definitely gonna do the delete too!

 

[enuff_zed]

I have a 2.2 which is basically the same. I find the easiest thing is to get out of first asap. I literally use it to start rolling then immediately go to second. The torque is sufficient to not really need first once the car is at walking pace.
So don’t rev it at all really, just clutch up, start to move, second.

 

[MikeyH]

Same here with my 2.2. As long as pointing slightly down hill 2nd is fine, I found early on that 1st is hopeless. My wife keeps asking why am I starting of in 2nd, use 1st. As above on uphill and flat just use 1st to roll a little then into 2nd and your off

 

[raymond.harper]

Oddly enough, I miss the flexibility of the 5-speed! Does your car still have the CDV active?

 

[Mike6]

I have the 2.5i and find first gear is really just for moving of from standstill and doesnt really help in accelerating. The gearbox on these early cars was recognised as fairly good with a reasonable gap between gears and when in 5th car pulls very well. The newer 2.5i post 2006 and known as the facelift has a reduced bhp output but benefited from a 6th gear. Never driven one of those cars so cannot comment. Around this time it all gets very confusing with the introduction of the Si.

 

[MikeyH]

Experimented today uphill. Accelerating smoothly up to 3500 revs in 1st and changing to 2nd seems to be what I do, I think I must do it without realising.

 

[Mr Tidy]

I've not had a Z4 with that drivetrain but I did have an E46 325ti Compact with the 2.5 litre M54 engine and a 5 speed gearbox.

I didn't tend to go much past 2,000rpm in first before I changed to 2nd (unless I was in a hurry) and it was perfectly happy with that. Getting the CDV removed and a new bush fitted to the gear linkage which was a bit sloppy definitely improved things.

If anything it might have been lower-geared than a Z4 as 70mph in 5th was more or less 3,000rpm but it would happily potter along in 5th at 40mph and still accelerate if required.

 

[GadgetMart]

Ignore the CDV delete advice, it’s nonsense.
If I dumped the clutch in my 3.0si it would eat it in one go.
It’s there for a reason.

 

[Joez4]

Ignore the CDV delete advice, it’s nonsense.
If I dumped the clutch in my 3.0si it would eat it in one go.
It’s there for a reason.

Don't dump the clutch then, most car manufactures still don't use this valve so dumping the clutch would destroy them wouldn't they?

In my opinion if you can drive a manual properly then remove the cdv, it's only there to compensate for people who can't operate a clutch

 

[enuff_zed]

Ignore the CDV delete advice, it’s nonsense.
If I dumped the clutch in my 3.0si it would eat it in one go.
It’s there for a reason.

Don't dump the clutch then, most car manufactures still don't use this valve so dumping the clutch would destroy them wouldn't they?

In my opinion if you can drive a manual properly then remove the cdv, it's only there to compensate for people who can't operate a clutch

Ignore the CDV delete advice, it’s nonsense.
If I dumped the clutch in my 3.0si it would eat it in one go.
It’s there for a reason.

Don't dump the clutch then, most car manufactures still don't use this valve so dumping the clutch would destroy them wouldn't they?

In my opinion if you can drive a manual properly then remove the cdv, it's only there to compensate for people who can't operate a clutch

Thanks for the injection of humour
People who really know how to operate a clutch can do it equally well with or without a cdv.

 

[Joez4]

Well obviously you can learn the characteristics of the clutch with a cdv fitted just like you would any clutch but in my experience the cdv makes you drive like a granny hardly what you want from the ultimate driving machine is it.

 

[Mr Tidy]

I've had the CDV removed from my last 5 BMWs and never had a problem, but then I don't just dump the clutch!

I learnt years ago that wasn't a good idea when I blew up the diff in a 2.8i Capri. :lol:

But the change from 1st to 2nd tends to be improved once the CDV is in the bin.

 

[enuff_zed]

Well obviously you can learn the characteristics of the clutch with a cdv fitted just like you would any clutch but in my experience the cdv makes you drive like a granny hardly what you want from the ultimate driving machine is it.

Methinks you need to practice more granny.
Or should have been born early enough to learn on 70s and 80s cars.

 

[Joez4]

Well obviously you can learn the characteristics of the clutch with a cdv fitted just like you would any clutch but in my experience the cdv makes you drive like a granny hardly what you want from the ultimate driving machine is it.

Methinks you need to practice more granny.
Or should have been born early enough to learn on 70s and 80s cars.

I drive a 50 year old tractor at work does that count lol

 

[Mr Tidy]

I drive a 50 year old tractor at work does that count lol

Well I doubt it has a CDV!

So I'm not sure why you'd want one?

 

[Joez4]

I removed my cdv and never looked back, yeah I learnt to drive with it smoothly but it took the fun out of driving a sportscar

 

[enuff_zed]

I removed my cdv and never looked back, yeah I learnt to drive with it smoothly but it took the fun out of driving a sportscar

I wonder if this is connected to the recent discussion about clutch travel? The cdv works as a one way restrictor, slowing the return of fluid and therefore making the clutch take slightly longer to re-engage.
As this is a linear function it makes sense that if you only depress the clutch far enough to disengage, rather than flat to the floor, then the time taken to re-engage will be less.
Could explain why not everyone sees a need to remove it?

 

[Joez4]

I removed my cdv and never looked back, yeah I learnt to drive with it smoothly but it took the fun out of driving a sportscar

I wonder if this is connected to the recent discussion about clutch travel? The cdv works as a one way restrictor, slowing the return of fluid and therefore making the clutch take slightly longer to re-engage.
As this is a linear function it makes sense that if you only depress the clutch far enough to disengage, rather than flat to the floor, then the time taken to re-engage will be less.
Could explain why not everyone sees a need to remove it?

Seems logical to me, have read plenty of stories where people don't notice a difference with it gone, but I noticed a vast improvement, it's my understanding that it doesn't matter how quick you bring the clutch up the valve controls when the clutch engages not your foot I always felt I had to give the car a ton of revs to allow for this delay