Surprise: Our BMW 435i broke a belt during its first track day

J.G.
Update by J.G. Pasterjak to the BMW 435i project car
Feb 16, 2024 | BMW, 435i, Serpentine Belt

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Our latest BMW project car? The one that’s just off warranty? It broke after just a lap and a half.

While cruising around a damp-but-drying Florida International Rally and Motorsport Park in our 2015 BMW 435i, just warming up the oil, the dash let us know that our charging system was no longer a charging system and just a “sitting …

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Comments
Slippery
Slippery GRM+ Memberand PowerDork
2/16/24 8:54 a.m.
Noddaz
Noddaz GRM+ Memberand PowerDork
2/16/24 9:00 a.m.

Interesting!  Does anyone make a steel pulley to replace the plastic one?

Wait!  You guys have a lathe.

Jerry
Jerry PowerDork
2/16/24 9:08 a.m.

Glass half full - you made it all the way from Cincinnati without issues.

calteg
calteg SuperDork
2/16/24 9:25 a.m.

David S. Wallens
David S. Wallens Editorial Director
2/16/24 9:42 a.m.
Slippery said:

You guys should have read this article before going to the track!

https://grassrootsmotorsports.com/project-cars/2017-golf-gti/how-to-tech-a-used-car-for-the-track-project-golf/

 

I know, right!?

 

JG Pasterjak
JG Pasterjak Production/Art Director
2/16/24 10:32 a.m.
Jerry said:

Glass half full - you made it all the way from Cincinnati without issues.

On balance, shredding a belt an hour away from home with a trailer is better than a day away from home on I-26.

z31maniac
z31maniac MegaDork
2/16/24 11:04 a.m.

Perfect example of why that era of turbo BMWs is not great. When mine started making a noise even the specailist couldn't diagnose, drove it down the street and traded it for a one year old Mazda 3. 

$10k DCT? $7k for a used engine? Nope. 

jgrewe
jgrewe Dork
2/16/24 11:19 a.m.
calteg said:

Uh, me?

Actually they got off easy. I'm glad the project update didn't begin with, "It ate the belt."

On my F25 chassis you can pull the whole fan assembly out the top and then have plenty of room.

If you see any sign of a leaking front seal I have the primer, glue and tools to do the job. The primer expires this month so let me know.

Duckzero
Duckzero GRM+ Memberand New Reader
2/16/24 1:17 p.m.

Every time I think about getting a BMW, I see/hear/read about something wild happening to them. 

This doesn't seem toooooo bad, but still. 

Feedyurhed
Feedyurhed UltraDork
2/16/24 1:27 p.m.
Duckzero said:

Every time I think about getting a BMW, I see/hear/read about something wild happening to them. 

This doesn't seem toooooo bad, but still. 

Exactly this. And I spent half my life driving Subaru's and Rotaries and these BMW stories still scare me.

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