Z4 roadster, 2.5 litre or 3 litre Se or Sport
Z4 roadster, 2.5 litre or 3 litre Se or Sport
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Discussion

Bosshogg76

Original Poster:

792 posts

213 months

Wednesday 13th January 2010
quotequote all
I have hit my midlife crisis early I think, the wife has just got a golf and I have no requirement for a 4 door car, so my 320 Msport is about to be punted. I'm torn between a 2.5 litre Z4 and the 3 litre. As far as I can tell, I'm going to be stung with the same amount for car tax, so my rationale is to get the 3 litre version. Unless of course someone can point out a good reason not to? such as a crippling fuel bill, problems with the 3 litre engine or outlandish servicing costs, compared with the 2.5litre.

Addtionally, what trim level to go for, my current car, has run flats and the Msport suspension, to say it is firm is a mild understatement, so i'm pondering whether the soft suspended se might be the way forward if I persist in running RFTs.

Any information on this would be gratefully recieved. Also has anyone fitted a GruppeM intake, I wouldn't mind hearing that straight 6 a bit more.


rassi

2,517 posts

281 months

Wednesday 13th January 2010
quotequote all
2.5 and 3 litre have identical consumption in real life, so the 3.0 would be the choice, everything else being equal. Try the SE and Sport, as the Sport is reported to have a rather unforgiving suspension, which may or may not suit you.

junglie

2,052 posts

247 months

Wednesday 13th January 2010
quotequote all
What year are you looking at?

Bosshogg76

Original Poster:

792 posts

213 months

Wednesday 13th January 2010
quotequote all
junglie said:
What year are you looking at?
04-06ish seems to be in the price range.

junglie

2,052 posts

247 months

Wednesday 13th January 2010
quotequote all
I bought an 2003 Z4 3.0i SE and it is the one to go for. I have had 5 previous BMWs so I am reasonably familiar with the engines.

Obviously the Z4 3.0i changed to the 3.0si which provides an extra 30bhp or so around 05 / 06 but you would need to check the dates.

Happy to talk about my model if it is of any use to you?

Bosshogg76

Original Poster:

792 posts

213 months

Wednesday 13th January 2010
quotequote all
junglie said:
I bought an 2003 Z4 3.0i SE and it is the one to go for. I have had 5 previous BMWs so I am reasonably familiar with the engines.

Obviously the Z4 3.0i changed to the 3.0si which provides an extra 30bhp or so around 05 / 06 but you would need to check the dates.

Happy to talk about my model if it is of any use to you?
It would be quite a bit of use, any thoughts on the car, and what extras would be deemed manadtory to look for, along with the costs of ownership, would be great.

junglie

2,052 posts

247 months

Wednesday 13th January 2010
quotequote all
I am going to assume that you particularly want a 2 seat convertible and you have ruled out the other similar cars (Boxster, 350Z, S2000 etc). With that in mind the following are some of my thoughts:

- The 3.0i is the best of the bunch of that era. 231 bhp and a fair amount of torque (in the region of 220ft lb at 3500 rpm) ensure that you can make lively progress or pull cleanly from less than 1000 rpm. The noise is lovely - a deep base note at low revs turning into a straight 6 howl at higher revs. 2.5i has less power and torque, cost the same (almost) and uses the same fuel so a no brainer really.

- Fuel economy is in the early 30s. I am getting around 34 - 36 mpg at present but most of that is on the motorway. A cross country jaunt for 50 miles or so saw 32 mpg but that will be lower in city driving and the likes. I am running on 97 - 99 RON which is more expensive but I am getting approx 2 mpg more and better response so it breaks even.

- The 3.0 comes with the 6 speed manual gearbox (auto also available) which provides closer ratios than the 5 speed box but a similar final drive ratio. 85mph equates to approx 3000rpm in top.


- As far as equipment goes there are not that many options. I have electric seats and heated seats as the only 2 options along with the electric hood, climate control etc as standard. I have refurbished alloys that are actually from a 1 Series and suit the car very well - they look similar to the 108's (5 spoke standard 18" alloys) but with a subtle difference. It does however feel quite sparse for what is a £10k+ car. You need to remember that this a a 2 seat sports car, it is paraticle but it is still a 2 seat sports car. You seem to get more for your money in an E46 convertible but part of that is layout. All the climate, fan speed, rear window demist etc on the Z4 is on 3 small dials on the centre console rather than a large keyboard like the E46. Rear vis (hood up) is not brilliant so the argument for rear parking sensors is there but the car is so short and you sit close to the rear bumper so not an issue really.

- Bin the run flats as soon as possible - they do not complement the ride. I am running standard tyres and all is well.

- Build quality - good but perhaps not up to the standards of the E39. There are very few ratlles or creaks but you get the feeling the quality is just not the same.

- Running costs - the same as a 3 Series. Usual Inspection I followed by Oil Service followed by Inspection II. Prices vary but I use an Indy. No real difference from any main stream car bar the requirement for an extra couple of spark plugs.

Let me know if I can provide anymore info.

Bosshogg76

Original Poster:

792 posts

213 months

Wednesday 13th January 2010
quotequote all
junglie said:
I am going to assume that you particularly want a 2 seat convertible and you have ruled out the other similar cars (Boxster, 350Z, S2000 etc). With that in mind the following are some of my thoughts:

- The 3.0i is the best of the bunch of that era. 231 bhp and a fair amount of torque (in the region of 220ft lb at 3500 rpm) ensure that you can make lively progress or pull cleanly from less than 1000 rpm. The noise is lovely - a deep base note at low revs turning into a straight 6 howl at higher revs. 2.5i has less power and torque, cost the same (almost) and uses the same fuel so a no brainer really.

- Fuel economy is in the early 30s. I am getting around 34 - 36 mpg at present but most of that is on the motorway. A cross country jaunt for 50 miles or so saw 32 mpg but that will be lower in city driving and the likes. I am running on 97 - 99 RON which is more expensive but I am getting approx 2 mpg more and better response so it breaks even.

- The 3.0 comes with the 6 speed manual gearbox (auto also available) which provides closer ratios than the 5 speed box but a similar final drive ratio. 85mph equates to approx 3000rpm in top.


- As far as equipment goes there are not that many options. I have electric seats and heated seats as the only 2 options along with the electric hood, climate control etc as standard. I have refurbished alloys that are actually from a 1 Series and suit the car very well - they look similar to the 108's (5 spoke standard 18" alloys) but with a subtle difference. It does however feel quite sparse for what is a £10k+ car. You need to remember that this a a 2 seat sports car, it is paraticle but it is still a 2 seat sports car. You seem to get more for your money in an E46 convertible but part of that is layout. All the climate, fan speed, rear window demist etc on the Z4 is on 3 small dials on the centre console rather than a large keyboard like the E46. Rear vis (hood up) is not brilliant so the argument for rear parking sensors is there but the car is so short and you sit close to the rear bumper so not an issue really.

- Bin the run flats as soon as possible - they do not complement the ride. I am running standard tyres and all is well.

- Build quality - good but perhaps not up to the standards of the E39. There are very few ratlles or creaks but you get the feeling the quality is just not the same.

- Running costs - the same as a 3 Series. Usual Inspection I followed by Oil Service followed by Inspection II. Prices vary but I use an Indy. No real difference from any main stream car bar the requirement for an extra couple of spark plugs.

Let me know if I can provide anymore info.
Junglie, thank you for going to the time and effort to type all that, it is much appreciated. I have an E90 3 series at the moment, which to be honest is all the car i would ever need, but the temptation to have a 2 seater is getting a bit much.

Anyway thank you again, and if I have any more questions I'll let you know thumbup

a11y_m

1,861 posts

252 months

Thursday 14th January 2010
quotequote all
Bosshog76, you'll get a great overview/comparison of the 2.5 vs 3.0 on www.z4-forum.com (unless you've already discovered the site).

I also own a 3.0i SE (54-plate, same model as the PHer above mentions) and agree with most of what's listed above. The 3.0i came as standard with the Sport suspension (unlike the 2.5 of that era) so although it's designated as an SE model, that's not true for the ride.

- binning the runflats is essential IMO, or at least changing to another model of runflat - others seems to give a better ride
- rear springs on all models are prone to snapping, but not a major expense to change (Eibach springs are a common upgrade)
- the standard seats are less supportive than the optional Sport seats, but I personally prefer the standard seats, comfier - it's something you really need to try for yourself

And you mention the Gruppe M: an alternative is to modify the "sound generator" fitted as standard to the 3.0i. It's a plastic tube feeding noise from the standard air intake, through the bulkhead into the cabin. As standard it comes filled with 2 bits of foam, but many owners take either one (louder) or both (too loud!) bits of foam out. Makes quite a difference to noise inside the cabin without being crazy loud. It's a free mod that takes 2mins to do and completely reversible, so worth trying.

a11y_m

1,861 posts

252 months

Thursday 14th January 2010
quotequote all
Bosshog76, you'll get a great overview/comparison of the 2.5 vs 3.0 on www.z4-forum.com (unless you've already discovered the site).

I also own a 3.0i SE (54-plate, same model as the PHer above mentions) and agree with most of what's listed above. The 3.0i came as standard with the Sport suspension (unlike the 2.5 of that era) so although it's designated as an SE model, that's not true for the ride.

- binning the runflats is essential IMO, or at least changing to another model of runflat - others seems to give a better ride
- rear springs on all models are prone to snapping, but not a major expense to change (Eibach springs are a common upgrade)
- the standard seats are less supportive than the optional Sport seats, but I personally prefer the standard seats, comfier - it's something you really need to try for yourself

And you mention the Gruppe M: an alternative is to modify the "sound generator" fitted as standard to the 3.0i. It's a plastic tube feeding noise from the standard air intake, through the bulkhead into the cabin. As standard it comes filled with 2 bits of foam, but many owners take either one (louder) or both (too loud!) bits of foam out. Makes quite a difference to noise inside the cabin without being crazy loud. It's a free mod that takes 2mins to do and completely reversible, so worth trying.

Tony 1234

3,465 posts

257 months

Thursday 14th January 2010
quotequote all
Bosshog76, My 04 3.0 will be for sale next month, 1 careful 64 year old owner

Bosshogg76

Original Poster:

792 posts

213 months

Thursday 14th January 2010
quotequote all
a11y_m said:
Bosshog76, you'll get a great overview/comparison of the 2.5 vs 3.0 on www.z4-forum.com (unless you've already discovered the site).

I also own a 3.0i SE (54-plate, same model as the PHer above mentions) and agree with most of what's listed above. The 3.0i came as standard with the Sport suspension (unlike the 2.5 of that era) so although it's designated as an SE model, that's not true for the ride.

- binning the runflats is essential IMO, or at least changing to another model of runflat - others seems to give a better ride
- rear springs on all models are prone to snapping, but not a major expense to change (Eibach springs are a common upgrade)
- the standard seats are less supportive than the optional Sport seats, but I personally prefer the standard seats, comfier - it's something you really need to try for yourself

And you mention the Gruppe M: an alternative is to modify the "sound generator" fitted as standard to the 3.0i. It's a plastic tube feeding noise from the standard air intake, through the bulkhead into the cabin. As standard it comes filled with 2 bits of foam, but many owners take either one (louder) or both (too loud!) bits of foam out. Makes quite a difference to noise inside the cabin without being crazy loud. It's a free mod that takes 2mins to do and completely reversible, so worth trying.
Thanks very much for the information and the forum link, I'll have a closer look at that later. Just a word on the eibachs, is that a direct replacement for just the rears, or is it something like the sportline kit, where you replace all 4?

I love the sports seats in my E90 along with the sports steering wheel, so I think I will try and find a car with those in.

The mod you detailed, is certainly a much more wallet friendly mod to the Gruppe M, and my favourite kind of mod, FREE.

Tony1234, thanks for your offer, however I need to part ex my current car.

Sticks.

9,710 posts

281 months

Thursday 14th January 2010
quotequote all
I've had mine 5 years now and agree with what's been said. Minor things to add. IMO, if you can, go for the facelift 3.0. 3.0's have more standard kit than 2.5s, like electric seats. Star Spoke 108s have corrosion issues, roof motor failure is not unknown, and expensive. I myay be wrong but I think the fault (drains) was corrected on facelift models.

I had sport seats on my 120 and they were great, but iirc they're narrower on the Z4. Imo it's worth getting as high spec as you can. Xenons and heated seats are popular, 18s and leather are all-but standard, cruise is an easy retro fit pre-facelift, mfsw can be added, sat nav was a £2k option when new.

For the balance of performance, fun, reliability and costs I don't think much comes close. Btw, black, silver and grey demand the best prices.

Bosshogg76

Original Poster:

792 posts

213 months

Thursday 14th January 2010
quotequote all
a11y_m said:
Bosshog76, you'll get a great overview/comparison of the 2.5 vs 3.0 on www.z4-forum.com (unless you've already discovered the site).

I also own a 3.0i SE (54-plate, same model as the PHer above mentions) and agree with most of what's listed above. The 3.0i came as standard with the Sport suspension (unlike the 2.5 of that era) so although it's designated as an SE model, that's not true for the ride.

- binning the runflats is essential IMO, or at least changing to another model of runflat - others seems to give a better ride
- rear springs on all models are prone to snapping, but not a major expense to change (Eibach springs are a common upgrade)
- the standard seats are less supportive than the optional Sport seats, but I personally prefer the standard seats, comfier - it's something you really need to try for yourself

And you mention the Gruppe M: an alternative is to modify the "sound generator" fitted as standard to the 3.0i. It's a plastic tube feeding noise from the standard air intake, through the bulkhead into the cabin. As standard it comes filled with 2 bits of foam, but many owners take either one (louder) or both (too loud!) bits of foam out. Makes quite a difference to noise inside the cabin without being crazy loud. It's a free mod that takes 2mins to do and completely reversible, so worth trying.
Thanks very much for the information and the forum link, I'll have a closer look at that later. Just a word on the eibachs, is that a direct replacement for just the rears, or is it something like the sportline kit, where you replace all 4?

I love the sports seats in my E90 along with the sports steering wheel, so I think I will try and find a car with those in.

The mod you detailed, is certainly a much more wallet friendly mod to the Gruppe M, and my favourite kind of mod, FREE.

Tony1234, thanks for your offer, however I need to part ex my current car.

Tony 1234

3,465 posts

257 months

Thursday 14th January 2010
quotequote all
Bosshogg76 said:
Tony1234, thanks for your offer, however I need to part ex my current car.
Ah thats ok, best of luck.

AB

20,549 posts

225 months

Thursday 14th January 2010
quotequote all
2.5 vs 3.0 - I test drove them both and I really couldn't find much difference if I am honest. The lower insurance cost of the 2.5 and the fact that there was a fully spec'd one 2 miles away in my local BMW dealership swung it for me.

Mine IS currently for sale, has every extra except for sat nav including the sports suspension and I would be open to discussing part ex on the E90. It's a 54 2.5i SE but most people seem to be put off with the 72k miles (all motorway!).

Drop us an email if there is any interest there, otherwise happy hunting!


Herbs

5,132 posts

259 months

Thursday 14th January 2010
quotequote all
Echoing the post a few above:

get rid of the runflats - it transforms the car
Try and get the following options

Heated seats (most important for me as it allows the car to be used roof down pretty much every day of the year)
xenons
wind deflector
parking sensors
larger alloys
sat nav
HK Stereo/DSP/Logic 7 (sounds superb and so much better than the standard one)


Either way you will enjoy the car but those options make it that bit more enjoyable and that bit easier to sell on in the future. (i'm on my 2nd wink)

Mattt

16,664 posts

248 months

Thursday 14th January 2010
quotequote all
Agree with most of the above - I've got the 3.0i, and it's a great all rounder (comfort vs speed/handling) - such a nice engine.

I have the SMG version, which is pretty rare - but suits the car well IMO. Easy to drive in traffic/town, then good fun when on nice open twisty roads with sport mode engaged.

Nav is a good option to have, not for the Nav itself (which is crap) but for the integration you get.

Carver sound system is good, one of the best stock systems I'd heard.

Sport seats are nice, I'm quite broad shouldered - and they're still comfortable on long runs.

The only options I don't have are Xenons and Heated seats - which I don't really mind. Never had a car with Xenons before, so don't miss them - the halogens seem to work ok, and the heated seats I'm not too fussed about - the cabin seems plenty warm enough with heaters on full blast - in fact if you stop at lights or anything, it gets too hot very quickly!

It would be nice to have everything, but you often seem to end up with a choice of cars that have 1 or 2 things missing from full spec.

I reckon full spec on a 3.0i SE would've added around £10k (list) to the total price, bringing it to around £45k I'd guess. A lot of car for not a lot of cash these days.

a11y_m

1,861 posts

252 months

Friday 15th January 2010
quotequote all
Bosshogg76 said:
Thanks very much for the information and the forum link, I'll have a closer look at that later. Just a word on the eibachs, is that a direct replacement for just the rears, or is it something like the sportline kit, where you replace all 4?
No probs. It's the full set of 4 springs, designated by Eibach as "Pro" rather than their "Sportline" range. They're 30mm lower than a standard Z4, or 15mm lower than a Sport equipped Z4.

a11y_m

1,861 posts

252 months

Friday 15th January 2010
quotequote all
Herbs said:
Echoing the post a few above:

get rid of the runflats - it transforms the car
Try and get the following options

Heated seats (most important for me as it allows the car to be used roof down pretty much every day of the year)
xenons
wind deflector
parking sensors
larger alloys
sat nav
HK Stereo/DSP/Logic 7 (sounds superb and so much better than the standard one)


Either way you will enjoy the car but those options make it that bit more enjoyable and that bit easier to sell on in the future. (i'm on my 2nd wink)
Good point about options helping with future selling. I bought mine without heated seats and cruise control, but have since managed to retrofit both very easily and cheaply. The seats aren't something I thought I'd use much so I did it mainly for that reason, and to keep the wife happy, but I'm surprised how much I'm enjoying them. I used the roof down regardless of temperature before anyway but now it's more comfortable!