Dumb Question Thread - No Flaming Allowed

[ATB88]

What's the rough lifespan of OE rubber RTABs (Z4M variant) with vorshlag limiter shims installed? I had them installed when I got the car at 45k miles, now I'm up to 105k miles 7 years later. Are they for sure cooked? The ones that were on the car with 45k miles were absolutely cooked. Do the limiter shims make a huge difference in lifespan? Also, is there any disadvantage of moving to spherical monoball RTABs when I replace? (car is street only vert, lots of freeway miles)

The limiters should help yes, but I also think their lifespan is heavily dependent upon install technique (clocked correctly). But with 60k, they're surely done. Get solid anyway.

Interesting data point for anyone with this question in the future: just went in and replaced stock/Z4M RTABs with SDW monoballs because I was getting an alignment anyway.

The 7 year old and 60k mile rubber RTABs that I took out were absolutely pristine. Rubber looks and feels new to the touch. Either I'm not driving my car hard enough, or those Vorshlag limiters really completely change how these RTABs get used. Also, Tyler, to your point about them being installed correctly: I remember being kinda peeved because when I asked the tech who did the work if they pre-loaded them on install (I had been reading about this job back then and was curious if it was necessary -- had a shop do it because I was roadtripping the car home from GA where I bought it) he gave me a blank stare and then mumbled that it's not necessary. So FWIW, I do think mine were, technically, improperly installed.

I'm now curious enough to follow up with another dumb question -- to what extent do limiters have any negative effect on intended performance/behaviour of OEM rubber RTABs? My experience here tells me that monoballs are overkill and stock rubber with limiters are a great way to go, unless the limiters force some other tradeoff.

The monoballs are pretty and cool tho, so not a bad option if you wanna spend $150-$200 more and not have to ever do RTABs again I guess.

[karter16]

crazy just experienced the same thing but with the passenger door, interested to find out if there is some adjustment.

I have an RHD and mine is the same, passenger door is crisper and quieter. Pretty sure it's just that whichever door is the driver's door gets used a lot more a wears over the time. Adjustment definitely made things a lot better for me, but it's still not as good as passenger door. Pretty sure replacement of the latch mechanism etc. is what's needed to fix the rest of it.

[bagger]

Same with my passenger door. Passengers often actually think it's locked and I have to tell them to pull a little more lol

Mine have always been that way. If there is a way to tune it - I'm here for it!

[ATB88]

crazy just experienced the same thing but with the passenger door, interested to find out if there is some adjustment.

Same with my passenger door. Passengers often actually think it's locked and I have to tell them to pull a little more lol

[elrichmeister]

I noticed today--not sure how--that my driver side exterior door handle requires more travel compared to the passenger side to "open" the door. Is there an adjustment procedure for this? The passenger side "feels" better to me (tighter/crisper/less travel), but, I'll let sleeping dogs lie if I need to; the driver door opens just fine.

crazy just experienced the same thing but with the passenger door, interested to find out if there is some adjustment.

[CrisSilberGrau]

I have a set of Shrick 280/272 cams (manufactured late 2022, new polished lobes that force you to get rockers instead of the black nitride lobes of old) that are slightly damaged after install. I've documented this well in my build thread and as well on the Cam thread here on the forum (link to follow). While they are damaged, it is also minimal. Is there a point to put them up in the For Sale section for a heavily reduced price for someone to take on as a project or is this a lost cause? I'd be selling them for less than half what they were new in 2022 when I got them from Bimmerworld ($750 obo) and they'd come with the relief valve as well.

If it's worth it please let me know.

[PSUEng]

I noticed today--not sure how--that my driver side exterior door handle requires more travel compared to the passenger side to "open" the door. Is there an adjustment procedure for this? The passenger side "feels" better to me (tighter/crisper/less travel), but, I'll let sleeping dogs lie if I need to; the driver door opens just fine.

[Cubieman]

I have CMP subframe raising bushings and am replacing my diff and wondering if I must lower the S.F to get the diff out? My first guess would be yes..

[E46m3zcp]

Can someone tell me how much the Mason Engineering rear X Brace was going for. I used wayback machine but the photos don’t load, and the item that’s got the most similar description was listed at $490.00

This is the product I’m talking about:

[D-O]

What's the best way to clean the sunroof drains on these cars?

I have not cleaned the drains on the M3, but I did recently clean them on a Toyota and I used 1/4" polyethylene tubing from Home Depot. <$5.00 for a 25' roll. I just fished it down the drains from up top. Worked great.

[Shonky]

I replaced my original alternator 2yrs ago with a brand new Valeo unit; runs great so far. To "protect" against NLA parts and rising prices, is it more prudent to order a complete Valeo alternator and put on the shelf, or just get the voltage regulator kit as a spare? Of course, $100 for a VR vs. $270 or so for a complete unit.

Depends on what kind of failure you plan on having Mine (a Valeo) developed an open circuit in one of the windings so those spares wouldn't be any use. Sure it's a less likely failure but still you're trying to predict the future really.

[Cubieman]

What's the best way to clean the sunroof drains on these cars?

Not sure how accessible they are, I have never looked on the M3.
A very long time ago my old Jeep sunroof drains clogged up, the only thing that worked well was compressed air. You just want to make sure you have some way of stepping down the air pressure.

You could use a shopvac that blows air and neck it down with tubing to the point you could insert it into the drains. I think I pulled the hard plastic tube off one of those cheapo fluid transfer pumps to get a small enough size to work with.

[D-O]

I replaced my original alternator 2yrs ago with a brand new Valeo unit; runs great so far. To "protect" against NLA parts and rising prices, is it more prudent to order a complete Valeo alternator and put on the shelf, or just get the voltage regulator kit as a spare? Of course, $100 for a VR vs. $270 or so for a complete unit.

My alternator recently failed during a track day at Road Atlanta and I was glad I had a new Valeo sitting on the shelf at home. I then disposed of the failed unit instead of repairing it, so I am asking myself the same question you are. It feels profligate, but I think I am going to do both. When the one in the car fails I will have a new replacement and parts to build another spare.

[PSUEng]

I replaced my original alternator 2yrs ago with a brand new Valeo unit; runs great so far. To "protect" against NLA parts and rising prices, is it more prudent to order a complete Valeo alternator and put on the shelf, or just get the voltage regulator kit as a spare? Of course, $100 for a VR vs. $270 or so for a complete unit.

[PSUEng]

I have a BlueBus issue. I installed my BlueBus 6 months ago and absolutely love it. The 5x turn signal is great. Last week there has been a buzzing sound that matches the engine revs. I have not done anything to the car and confused as to why this is happening.
TIA

Contact Ted directly if you haven't already. He helped me through my issue which resulted in updating to the latest HKA unit. Great guy to work with.