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r/B58Enthusiasts

▲ 5 r/B58Enthusiasts

PCV Failing? 2020 m340i

Is this voice normal? It doesn’t seem like pcv from listening to how that sounds. What could this be? Hint*- it seems like it only just started, the temperature has dropped significantly, this is probably the coldest the car has idled during my ownership and I don’t recall this when it was in the mid 70s

u/Fun-Humor-4949 — 5 days ago
▲ 2 r/B58Enthusiasts

M340i goes limp/protection mode after full load 1st to 2nd gear shift.

Car specifications:
2024 M340i xDrive
58,000km (36,000mi)
BM3 Stage 2 93 oct
XHP Stage 3

For some context my car is on a stage 2 93 bm3 map and xhp stage 3, i’m using torque reduction set to 25% 1->2 and ignition cut off. my car drives completely fine no problems nothing weird but this is happened twice now in the last week, it’s rare though. Under full throttle load i shift to second gear in manual mode sports plus and the car doesn’t do it and every single malfunction light decides to come on, the car is forced into neutral and I can’t do anything about it. All I do though is turn off the car then turn it back on and it’s completely fine again like nothing happens. both times though I did this pretty quickly after turning it on or atleast had it running on remote start, so right after i fully turned on the car i’d put it in sports + and trans then floor it then boom, it’s only happened in manual mode. I’m honestly just curious i’m not worried about the car it drives more than perfect but do i need to set some limits on my trans tune or engine turn???

u/dyoxyss — 5 days ago
▲ 3 r/B58Enthusiasts

Spending $10K+ on a Pure800 build. Tell me what I got wrong

2019 X3 M40i, Gen1 B58, 30k miles, driven on the weekends in downtown Chicago. Previously ran MHD Stage 1 E30 with xHP Stage 3. I wanted more and dealer flashed me back to stock, so I’m restarting.

Build plan, targeting 550-600whp on E40/E50:
- Pure800 Gen1
- Active Autowerke catted DP (Illinois OBD test)
- Dorch DS25 HPFP
- VTT Gen1 PCV cap
- New plugs?
- MHD flex analyzer + custom flex map
- xHP Stage 3, looking at a TCU torque taper too

Skipping LPFP and not building the trans, no PI, and no driveshaft upgrades. I’m looking for improvement mostly for rolls from 20mph+ and highway on-ramps, I'm not launching it all the time.

Tires are at 3mm so they're getting replaced either way, and factory spec is 245/50R19 squared. I was going to put DWS06+, no second set, no storage.

Is a 245 tire a weak link at this whp or does xDrive handle it? I can live with traction issues if it’s at a full stop launch. I just don't want to spend $12k and find out the tires needed to be wider or ran on summer and winter sets.

Anything missing from the list that I'll regret cutting or should cut? I’m estimating cost with labor included.

If anyone has Chicagoland recommendations, I’m all ears too. Thanks!

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u/bourbonexplorer — 12 days ago
▲ 3 r/B58Enthusiasts

Got a cel on a road trip

On a road trip and got this lean code after driving 1000 miles. Gen 2 On stage 2 with catless dp and Berger intake. Car drives perfectly. I did switch to a 93 tune from 85 before I left. Any ideas? Comes back after a bit if I clear it.

u/ManagedTech — 11 days ago