I finally bought a Z4 - Ownership thread!

Further idle musing on gauge fitting.

It looks like I can get an adapter to fit a sender to the original location for the oil pressure switch, which would be a neat way of doing it that didn't disturb the Vanos banjo or require a complicated adapter.

However, it would relieve the car of its oil pressure switch. Does anyone know if there is a way to code out the standard oil pressure warning?
 
Same plans here. During the 7 years of ownership it went from a nice stock example to an undrivable on the road one. I do have high hopes that the Z4 will not end up the same way. I’ve pretty much hiven up on the track days so fingers crossed I won’t ruin the shed :rofl:
 
Micke said:
Same plans here. During the 7 years of ownership it went from a nice stock example to an undrivable on the road one. I do have high hopes that the Z4 will not end up the same way. I’ve pretty much hiven up on the track days so fingers crossed I won’t ruin the shed :rofl:
Well, I've just ordered the exact same pads that drove me to distraction on the road in my Mini. Perhaps I'll never learn?

The Brembo HC discs are sitting in my hallway waiting for the XP8s to arrive from Ian @ Carbotech, and the replacement trim for my passenger grab handle has arrived too. I guess it's progress, after a fashion.

The hunt is on for a 3.64 2.5i auto diff too. I've put a few wanted ads up, but nobody has responded yet. I've got my eye on one on ebay, but the breaker doesn't have great reviews.

I'm aiming to get the brakes and an oil/filter change (probably to 5w50) done before a Bedford trackday at the end of this month. Then I've got August to sort the diff (and potentially oil gauge) out before the Ring in September.
 
Shout out to Usel (again) for the late-night Whatsapp alert to a 3.64 diff on eBay. Managed to get a 3.0si auto diff for around 200 quid delivered, which is a complete bargain as far as I'm concerned.

Does anyone have a list of part numbers for the bushes which support the diff please? I'm really struggling to decipher the RealOEM diagrams.

@enuff_zed - PM incoming. How do you fancy fitting a diff? :D
 
DaveP said:
Shout out to Usel (again) for the late-night Whatsapp alert to a 3.64 diff on eBay. Managed to get a 3.0si auto diff for around 200 quid delivered, which is a complete bargain as far as I'm concerned.

Does anyone have a list of part numbers for the bushes which support the diff please? I'm really struggling to decipher the RealOEM diagrams.

@enuff_zed - PM incoming. How do you fancy fitting a diff? :D

Was a lucky find that! Was only speaking to someone yesterday morning as to whether they had one. They stated they are hard to find, expensive and it's easier to buy a car and break it. A few hours later one popped up on ebay cheap :D
 
Top stuff indeed.

I'm booked in with enuff_zed next week for him to fit my new brakes and work his magic with some coding, and then I'll squeeze in an oil change before Bedford on the 29th.

In the meantime, I'm going to empty and strip down the diff at home, giving it a decent check over and some new seals. Then I'll refill with decent oil and get it sent to the garage, along with a few bushes (once I've figured out which ones I need) to get it fitted up next month.
 
So, the car is back from Norfolk Zed Rescue, and in rude health!

Carbotech pads and Brembo discs fitted, oil swapped out for a 5w50 ahead of a couple of trackdays, and almost all of my dashboard lights extinguished! I couldn't be happier. enuff_zed rates a heady 11/10 on the good-egg-ometer. :thumbsup:

He even spotted that my errant bulb light was being caused by a loose foglight bulb, which is curious because a) my Creator didn't pick it up, and b) I've never touched the rear lights.

The last piece of the puzzle on dashboard is the steering wheel airbag, which proved too tricky to code out. Looks like I'm going to have to put a resistor in there, unfortunately. Not the end of the world though!

Diff is off to the specialist tomorrow, with a brief to swap the fluid, change the seals and inspect/change the bearings. I'm dithering with the idea of dropping an LSD in there while it's apart, but the most cost-effective option (Blackline) seems to get mixed reviews. I can't justify £1100+ right now for an Mfactory or Quaife, as I may decide to move the car on later this year if I don't gel with it at the Ring in September. Bit more research needed, I think.

Looking forward to Bedford on the 29th, and hoping it stays dry enough for me to push the car hard.
 
DaveP said:
So, the car is back from Norfolk Zed Rescue, and in rude health!

Carbotech pads and Brembo discs fitted, oil swapped out for a 5w50 ahead of a couple of trackdays, and almost all of my dashboard lights extinguished! I couldn't be happier. enuff_zed rates a heady 11/10 on the good-egg-ometer. :thumbsup:

He even spotted that my errant bulb light was being caused by a loose foglight bulb, which is curious because a) my Creator didn't pick it up, and b) I've never touched the rear lights.

The last piece of the puzzle on dashboard is the steering wheel airbag, which proved too tricky to code out. Looks like I'm going to have to put a resistor in there, unfortunately. Not the end of the world though!

Diff is off to the specialist tomorrow, with a brief to swap the fluid, change the seals and inspect/change the bearings. I'm dithering with the idea of dropping an LSD in there while it's apart, but the most cost-effective option (Blackline) seems to get mixed reviews. I can't justify £1100+ right now for an Mfactory or Quaife, as I may decide to move the car on later this year if I don't gel with it at the Ring in September. Bit more research needed, I think.

Looking forward to Bedford on the 29th, and hoping it stays dry enough for me to push the car hard.
It was a fun delivery run back to Dereham this morning. I was surprised just how comfortable the car was on back roads with the coilovers, albeit on their softest setting. The E89 seats are a superlative addition. [ref]Usel[/ref], you get my vote and I'm sure you're going to be busy!
With warnings ringing in my ears about those fancy brake pads needing a specific bedding in process, I managed to do the 22 miles (including a diversion which added 10 miles!) using the gears and hardly touching the middle pedal. One left hander tested the handling as it tightened up halfway through! :o
Great to finally meet up with [ref]DaveP[/ref] and to be able to tidy up at least some of his problems. :thumbsup:
 
Hi, I bought a Z4 about a week ago in Merlot Red. It’s the 2.5l se with some added extras. Really enjoy it. First convertible!
 
Brake pads bedded in yesterday morning on a quiet rural road, and I'd forgotten just how fiercely they bite.

The process for bedding them is quite convoluted, because they are technically a racing compound and not strictly road legal (no E-marking). It requires 4x moderate stops from 70-10mph, with gaps in between to allow for cooling, then four VERY HARD stops from 70-10mph with brief cooling breaks. With that completed, a 15-minute 'spirited' drive is required before parking up to let them cool completely. Such hardship.

With the braided hoses and upgraded fluid, the pedal feel was absolutely excellent - really firm with lots of modulation available. The braking performance was really something else, being able to lock the tyres quite easily on initial bite on a bumpy country lane at 70mph.

The wheels are now absolutely caked in brake dust, but mercifully I'm not hearing the annoying squeaking that almost drove me to distraction when I last used these pads on my Mini. There's something about sliding calipers that they don't like, perhaps a lack of chamfer on the leading edge of the pad just leaves them dragging a little?

Anyway, avanti!
 
That is very much like the Zeckhausen bedding in process that I follow when replacing the brake pads. It does make me quite quasey during that process :D
 
DaveP said:
Brake pads bedded in yesterday morning on a quiet rural road, and I'd forgotten just how fiercely they bite.

The process for bedding them is quite convoluted, because they are technically a racing compound and not strictly road legal (no E-marking). It requires 4x moderate stops from 70-10mph, with gaps in between to allow for cooling, then four VERY HARD stops from 70-10mph with brief cooling breaks. With that completed, a 15-minute 'spirited' drive is required before parking up to let them cool completely. Such hardship.

Wow, that sounds pretty brutal. :o

I had new OE pads fitted to my car a few weeks ago and was simply told to avoid heavy braking for the first 200km/125miles, which I have done. :)
 
Mr Tidy said:
DaveP said:
Brake pads bedded in yesterday morning on a quiet rural road, and I'd forgotten just how fiercely they bite.

The process for bedding them is quite convoluted, because they are technically a racing compound and not strictly road legal (no E-marking). It requires 4x moderate stops from 70-10mph, with gaps in between to allow for cooling, then four VERY HARD stops from 70-10mph with brief cooling breaks. With that completed, a 15-minute 'spirited' drive is required before parking up to let them cool completely. Such hardship.

Wow, that sounds pretty brutal. :o

I had new OE pads fitted to my car a few weeks ago and was simply told to avoid heavy braking for the first 200km/125miles, which I have done. :)
Yeah, brutal indeed. There's something about putting the whole pad through a thermal cycle that's required to get the best out of them on track. By doing the consecutive brakes, you're forcing heat into the heart of the pad material, but doing it slowly to avoid overheating.

Like I said, they are absolutely incredible on track. You'll melt your brake wear sensors before you get them to fade.
 
What a bloody brilliant trackday!

As mentioned before, I'm lucky enough to have a group of good mates who are all also massive car bores. Yesterday was just the perfect day out for a bunch of blokes who don't get together often enough (for the usual middle-aged reasons). 9 of us in 6 cars (some sharing, some just passengering) meant that we spent the whole day following each other on track, sharing passenger rides and standing around talking car bore stuff while the cars took a breather.

My track car isn't the most extreme or the fastest thing you'll see on track, but I've focused on trying to make it reliable and enjoyable on track without sacrificing the need to hop in and drive it at a moment's notice. I've spent money to make it as reliable as possible, knowing that there's nothing worse than losing track time because your car is broken.

Yesterday was a great vindication of this. It was absolutely sweltering (27 degrees at lunchtime!), and the car managed 130 miles on track being given an absolute pasting without complaint. Hacking around a race track with the roof off, with your best mate in the passenger seat laughing like a lunatic, is just the absolute best way to spend a day.

Screenshot 2024-07-30 at 11.37.40.png
(Yes, I'm going to buy a photo - I'm just waiting for them to all be uploaded)

As ever, trackdays tend to give you pause for thought about what to do/change. So far:
1. Tyres. My fronts were really struggling after 5 laps on such a fast circuit, and they were gaining pressure like crazy in the heat. I think I might need to switch up to something stiffer and more fade resistant. Currently trying to track down the last Pilot Sport 4S in my size (not easy), and they may have to come from Italy. Joy. If that fails, I might end up on something a bit more extreme like Cup 2s.

2. Suspension. Bedford is a really well surfaced track, but has a few kerbs that can be used as part of the racing line. I set my coilovers to halfway as a compromise, but was still getting a bit more roll than I'd like. I wish the rears were easier to adjust, but I think I might tighten them up next time out.

3. Diff. I'm looking forward to getting that diff in to see how much it can help perk the car up out of the slower corners. A couple more gearchanges would be a reasonable sacrifice for a bit more get-up-and-go.

4. Brakes. The Carbotechs were incredible. One of my passengers actually laughed out loud at how late I was braking, and they stood up to 5-6 laps of abuse, at a track where there are some very big stops. I think I'm going to upgrade the rear pads, as I'm conscious that the OEM stuff might leave me a bit unbalanced.

5. Oil. I need that gauge, pronto. I felt like I was flying blind yesterday, and on a hot day it's always useful to see how much abuse your car is taking.

6. Seats. The E89 seats were absolutely the right decision. 2hrs there and back, and a lot of track driving and I've got no aches and pains today. They aren't the most extreme seats, but they currently feel like the best compromise.

Overall, I'm VERY happy. :)
 
Only one other thing to mention, and that's the joy that some berk on the A14 drove over a tyre carcass in his lane and flicked it into my car.

The damage could have been much worse, but it's left black marks and scratches all the way down the left hand side. Bollards!

The paint is pretty average in places, and I think this is probably going to spur me on to tidy it up or wrap it over the winter. I have a little bit of bubbling on the rear arches that needs taking care of as a priority.
 
Great write up Dave and sounds like you had a fun day out with friends :thumbsup:

I had a Land Rover Defender, in front, that flicked out a lorry tyre carcass. The carcass was resting against the central reservation wall on the M25. Nothing you can do to avoid it, except brake as hard as you can, but not overly so, to avoid being rear ended whilst checking if you can change lane. Unfortunately the car had to take the hit.

I was driving my clients car, luckily, with their family on board who witnessed the events. However my client who was 10 minutes behind us at the time got home 2 hrs later than us because of the traffic jam caused from said tyre. The car was mechanically sound to carry on but it did crack the bumper and some trim was lost.

Screenshot_20240730_124447_WhatsApp.jpg
 
Another great photo! A good indication of how much the suspension is squatting under hard cornering (entering at ~70mph in 3rd).

Screenshot 2024-07-30 at 16.45.28.png
 
Good to know you had a great day on track Dave. :thumbsup:

Shame about the tyre debris though. :(
 
Result! I've found one of the last new/old stock sets of Pilot Sport 4S in my size. Michelin haven't produced this tyre in over a year, and they didn't make many in 17" when they were producing them. To say they are hard to come by is an understatement.

So many places online listed them as 'in stock soon - call for details', only for them to tell me they didn't have a date for when they expected them. Hardly shocking, given that Michelin aren't making them any more.

After finally speaking to someone who seemed to know what they were talking about, I managed to secure a set of 4. £600+ might be on the expensive side for 17" tyres, but it's absolutely worth it for the only tyres available that will take a pounding on track and not kill me on wet roads. I've got another airfield tuition day booked in a week or so, which will be a nice sendoff for the current tyres.

Very good news.

To Do List:
1. Rear pads
2. Diff
3. Oil gauge
 
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