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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Tracking, Autocrossing, Dragstrip, Driving Techniques > Worn flywheel springs - OK to auto-x/HPDE?

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      07-01-2013, 02:52 PM   #1
Phil G
Dominator of Deep South curvy roads
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Drives: '07 335i Coupe
Join Date: Apr 2006
Location: Atlanta, GA

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Worn flywheel springs - OK to auto-x/HPDE?

I am considering taking my 335i out for auto-x events, and maybe an HPDE at Road Atlanta (or Barber Motorsports Park in B'ham). Been wanting to do this for years, but just never had the time or money to do so.

My car has 102k miles on it now (have owned since new), and it was my first manual tranny car. Needless to say, I was a little harsh when shifting for the first 20-30k miles or so. So, my dual-mass flywheel springs are pretty worn (car sometimes lurches/surges when lifting off throttle, sometimes rattles and/or takes a little extra effort to engage smoothly, etc).

It has been this way for probably 50k+ miles, but I just haven't fixed it as it the holding power of the clutch seems to be fine....not to mention it would be a crazy expensive job. If anything, I didn't slip the clutch enough when I was a newbie tranny driver.

Would this cause a serious issue if I auto-x/HPDE the car?

'07 335i coupe (build date 02/2007) - Space Grey/Black Dakota/Dark Burl - 6MT/ZPP/ZSP/Nav/CA/Heated Seats. European Delivered in Munich 3/19 - 3/23/2007. 11 years and 160k miles of pure joy!

Mods: JB4, 335is clutch, Koni Sport shocks/struts, Cool Carbon street/track pads, R1Concepts Premium rotors, E46 ZHP shift knob, trim re-wrapped in VVIVYD carbon fiber vinyl
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      07-02-2013, 10:27 AM   #2
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Drives: '08 E92 335i
Join Date: Apr 2012
Location: Dallas

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2008 BMW 335i  [5.00]
Never heard of one exploding at the track but if you search the N54 engine forum a few of them have exploded when the springs were dead. I'd replace it if it were me.
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