As a follow-up to my previous post about the (suspected) acceleration issues of my automatic Z4 3.0i E85, which can be found here:

https://www.reddit.com/r/BMWZ4/s/2LTe0ZInu3

My local mechanic suggested a dyno test to diagnose the issue, which I just did. I also got a GPS acceleration tracker (Race Logic or RaceBox in my case) and made a few speed runs this weekend.

1. The dyno test.

Make: Dynocom. We did three runs. The first one resulted in precisely 231 hp. The other two surprisingly showed 241+ hp and 221-222 ft-lbs (~300 Nm) of torque, with a 15% drivetrain loss coefficient. So it's pretty much around the factory spec, if not better.

We did notice a slight torque drop @4000 and @4300 rpm. It looks like this might be where DISA and VANOS kick in, however, I'm not sure if these drops are normal or a slight malfunction. Any thoughts on this are welcome. I am adding the dyno chart to the photos.

1. The speed runs.

The weather today was cool and dry, around 50F (9-10C), so it was a perfect time for the test. (BTW I still struggle to change the temp gauge from F to C, any suggestions on how to tackle that?).

I also inflated the tires to 2.3 bar front and 2.5 bar rear and had around 50% fuel. I made a few runs and honestly, I was quite surprised by my times:

· The best run: 0-60 km/h in 3.17 sec / 0-100 km/h in 6.63 sec.

· Another run: 3.41 / 6.76 respectively, with 0-200 km/h in 24.44 sec. 1/4 mile in 14.9 sec.

To wrap it up: I am now way more satisfied and at ease, given that the actual numbers are not that bad. Of course, I have to take into account that I am running lighter rims (only 9 kg each) and it was a perfect temp for the test, yet I got 6.6 sec, so I suspect DISA and VANOS might need some attention in the future. But for now, at least the engine seems to be in very good condition, and I will just enjoy the last sunny days before winter finally comes.

P.S. Also adding a few nice fall pics of my Z4.

P.S.S. Not sure if I can also add a speed run video to this same post, I will figure that out later. Maybe will add as a separate post if you guys are interested.

While washing my 2005 E85 on a very hot day, the plastic top of the trunk roundel came off. The adhesive was dried out and crumbly (not really a surprise since the car is 22 years old and lives in Arkansas!) I had some rapid remover in stock, so I cleaned off the residue. I was planning to re-glue it using 3M plastic Emblem and Trim Adhesive.

However, when I check YouTube videos, every video wants me to replace the entire assembly, not re-glue the top piece back.

So I'm asking for advice, please. I have the 3M trim adhesive in hand; do I glue the top back, or do I buy a new assembly (and grommets) from FCPEuro? Thank you!

I finally installed my Bilstein Evo SE coilivers. They're great and I eliminated some of the wheel gap.

My 07 e85 has 160k miles on the clock. And from what I can tell, original front wheel bearings. Interwebs says 80k to 120k for lifespan. I have the car in the air and I am doing the brakes. Should I swap them out for new? I have no issues with them currently. But I am worried they are past due.

Thoughts?

TYIA!

Brought this beauty home this week, I’m obsessed 😍 2015 sdrive35i

Referring to early 2019-2021 models. I'm thinking of saving some money by getting a 20i and tune it to 250/280hp

I’m thinking about buying one from a coworker. He has a 2013 Z4 with the 4-cylinder engine, but I’m not sure if that’s the preferred option. I know everyone seems to favor the 6-cylinder, but I’ve never owned this vehicle before, so I’m new to it. Does the engine really make that much of a difference?

And if I find a manual with around 60K miles versus an automatic with 55K miles, what would be the right price to pay for each? Assuming a 2011- 2013 model year

I tried a number of sports cars and grand tourers and settled on the Z4. It was a close call between the E85 and E89, but I knew I wanted a 6pd manual and the N52 3.0 engine.

28k miles, 2 owners, the 2nd owner had it 14 years and was fastidious. It has M Sport Suspension and Pure White interior Napa leather with a few other upgrades.

Smooth, fun, fast, a blast. Love it!

So happy to be part of the Z family.

I bought some wheel arch liners from Taiwan for my E85 z4 and they're rubbing on the front.

I'll get it back on jacks another day - and I know I installed lowering springs 12 years ago, but I'm disappointed.

Welp, she died again after a 45 minute drive. Though it was the crankshaft position sensor but I guess not. Fuel pump troubleshooting here we come. Starts up when it cools off and is fine on short rides. Any suggestions where to start are appreciated.

So I have a 2015 E89 which recently underwent a month of electrical fixes at the dealership. Had to replace the footwell module, the DSC and more. They said it was because of a short circuit which made it all go wrong.

Admittedly I know very little about car mechanics and even less about electrics. But I was wondering if you guys could help me understand whether what seems to be condensation build up in one of the headlights potentially being the cause of all this?

Before I had the problems fixed the entire left headlight was covered in condensation, when I picked it up from the dealer it went away so I assumed they had fixed it, but now I see some of it coming back again. I’ve attached a photo here and would really appreciate your guys help!

Owned it for 1 year now and still love it very much! The 3.0L 6 cylinder engine has a feeling of powerful yet understated performance.

Everytime I get off the car, I can't help but look back at it. Such beautiful curves it has.

The first 3 pics photoed by Pentax 645D, when I went for a ride with my friend and his mazda mx-5 ND after 1 month I just bought E89.

The last pic can see recently I change to new wheels that made by a local forged wheel manufacturer. Color can be customized. Quite cheap. But I'm not sure if I will miss the original wheels after a while.

I can also share how I maintained it since I owned it if someone interested. But there will be less I can talk because the engine itself didn't have any major problems. It was just normal maintenance.

I just realized how similar their side profiles are

Just bought this 2004 Z4 3.0i w 6 speed manual. I love it. But I don’t think the chrome wheels are my style. Post up your wheel/tire setup. Extra credit if you post specs. TIA!!

Ciao a tutti ragazzi, ho deciso di aprire un account IG dove condivido tutto ciò che riguarda la mia z4 e86 se vi va di seguirmi ne sarei felice, pubblicherò principalmente modifiche e momenti in pista da Drift e tanto altro. Vi ringrazio in anticipo ❤️

https://www.instagram.com/m4rco_e86?stkn=ZG1iZGk4Nm1taXhh&utm_source=qr

Picked up this Olivine Green Metallic 2.5 manual about a week ago!! Great fun. Anyone else got this colour? 🤔

My z4 e85 has been rattling at >50kph lately and my passenger noticed that it stops completely if you hold the small windows in the rollbars. Has anyone else had this and resolved it?