Dumb Question Thread - No Flaming Allowed

[0-60motorsports]

Can Anyone confirm the PN for the ground cable from the engine to the chassis? 12421737755?

[bavarian3]

Ok diff mount questions.

Are the rear mount torx bolts (inside the cover) one time use only or can these be reused?
Is there supposed to be a washer between the mount and where it touches the subframe?
Anyone have an objection to using a different style of bolt of the same size and grade if I can't fit a torx socket on there? I have CMP subframe mounts

I've reused all my bolts without issue - however, I'm pretty sure they're all torque-to-yield and are considered single-use.

They actually don't show as TTY/"always replace" in the torque spec doc or TIS, as far as I could tell.

I see no issue with switching to a hex head if it's the same grade and length. Torx head is just for reduced chance of stripping. Not a bad idea tbh. No washer between the subframe and mount... https://www.realoem.com/bmw/enUS/sho...diagId=33_1076 . just for the mounting bolts.

I have cmp bushings, and initially had a tough time with the bolts as well. You need a lower profile ratchet and torque wrench. Check out my posts in this thread: https://nam3forum.com/forums/forum/m...ff-bolts/page4

[bavarian3]

Sure, you could, as long as you have the map sensor installed. I was able to pass smog in my state (Oregon) with a CSL tune. It depends on whether your state looks for modified code in the DME.

Good to know it'll run. Will have to look into the latter part. I'm guessing yes. CA problems.

[liam821]

Has anyone tried running a csl map sensor tuned car with a stock(standard m3) intake? Curious if it would run for smog purposes.

Sure, you could, as long as you have the map sensor installed. I was able to pass smog in my state (Oregon) with a CSL tune. It depends on whether your state looks for modified code in the DME.

Ok diff mount questions.

Are the rear mount torx bolts (inside the cover) one time use only or can these be reused?
Is there supposed to be a washer between the mount and where it touches the subframe?
Anyone have an objection to using a different style of bolt of the same size and grade if I can't fit a torx socket on there? I have CMP subframe mounts

I've reused all my bolts without issue - however, I'm pretty sure they're all torque-to-yield and are considered single-use.

[Nate047]

Ok diff mount questions.

Are the rear mount torx bolts (inside the cover) one time use only or can these be reused?
Is there supposed to be a washer between the mount and where it touches the subframe?
Anyone have an objection to using a different style of bolt of the same size and grade if I can't fit a torx socket on there? I have CMP subframe mounts

[bavarian3]

Has anyone tried running a csl map sensor tuned car with a stock(standard m3) intake? Curious if it would run for smog purposes.

[RickM3]

It does have angel eyes. Thank you!

[Cubieman]

Is there a common modification that requires a fused wire coming off of the positive jump terminal and then running to the cowling? I'll get a picture later if it would help in identifying the purpose of this wire.

Possibly angel eyes on the headlights.

[RickM3]

Is there a common modification that requires a fused wire coming off of the positive jump terminal and then running to the cowling? I'll get a picture later if it would help in identifying the purpose of this wire.

[Cubieman]

Another glass question, this time the front windshield.

I am hoping to buy a new windshield but need to make sure I get the correct one, if it's available that is.

I know nothing about glass but pulled some #'s off the windshield, after looking at realoem and all the options I don't believe I have enough information to proceed.

Should I use a VIN decoder to find what P/N I need?

FWIW this is all the numbers on my windshield that I could find:


Pilkington 43 R-001047

AS M 83-3 DOT 25
E000201

[Slideways]

Is there a consensus on a replacement rear windshield (brand, availability, etc)? Looks like OE is NLA? Not finding much info on the rear, most threads are on the front replacement. I'm getting the windows redone and the shop talked about replacing the rear glass if the old tint won't come off. Hopefully it won't come to that but I'd like to be prepared.

Pick one up from a parts car. Glass techs should be able to remove the rear glass without damaging it.

[Keith_MN]

Is there a consensus on a replacement rear windshield (brand, availability, etc)? Looks like OE is NLA? Not finding much info on the rear, most threads are on the front replacement. I'm getting the windows redone and the shop talked about replacing the rear glass if the old tint won't come off. Hopefully it won't come to that but I'd like to be prepared.

[DJAM3]

I've had two different MK20 cars, both with yellow tag racks. DSC doesn't seem any different to me. I turn it off if I plan on pushing the car.

[fattycharged]

Is it still a bad idea to swap to a faster steering rack if you're on a MK20 DSC? I recall reading a few years ago that because MK20 can't be programmed to account for different steering ratios than the stock M3 rack, if you swap in a different rack you'll set off DSC constantly. Is this a solved problem or still the same now in 2025?

Related question: anyone here rack swap a MK20 car and not regret it?

I always turn of DSC anyways, but curious if it still is an issue with it OFF as well


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[ATB88]

Is it still a bad idea to swap to a faster steering rack if you're on a MK20 DSC? I recall reading a few years ago that because MK20 can't be programmed to account for different steering ratios than the stock M3 rack, if you swap in a different rack you'll set off DSC constantly. Is this a solved problem or still the same now in 2025?

Related question: anyone here rack swap a MK20 car and not regret it?