Lightweight Batteries in E92 M3

Discussion in 'E90 Saloon / E92 Coupe / E93 Convertible M3 (2008-2013)' started by 7nth, May 9, 2019.

  1. 11 May 2019 at 5:32 PM #21
    Pdelamare

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    You have to careful which carbon shaft you use. I have one from the original supplier of the M Factory one, but I know that the DSS version does vibrate at speed. The M Factory one doesn’t.
     
  2. 11 May 2019 at 9:58 PM #22
    Scott

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    Great thread, a lot of useful information. Has anybody removed the IBS? Any negatives? Easy to do?
     
  3. 11 May 2019 at 10:12 PM #23
    philrob1

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    Do you notice a massive difference mate?
     
  4. 12 May 2019 at 12:54 AM #24
    mlhj83

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    If you remove IBS, it will affect the way Efficient Dynamics work, and it may affect brake energy regeneration, therefore the alternator will constantly be running, causing parasitic loss of engine power during acceleration.

    I monitor the voltage of my car, and I know the alternator disengages whenever I accelerate, as the voltage drops, but the moment I coast or brake, the voltage increases to over 14V, indicating that the alternator has reactivated.

    BMW states:

    "BMW's Brake Energy Regeneration operates differently: the generator is activated only when you take your foot from the accelerator or apply the brake. The kinetic energy that would otherwise go to waste is now used efficiently, converted into electricity by the generator and stored in the battery.
    Producing electricity in this highly efficient way delivers an additional advantage: when you apply the accelerator, the generator is deactivated - so the full power of the engine can be directed to the drive wheels. Brake Energy Regeneration thus increases fuel efficiency while simultaneously enhancing driving dynamics. As a safety precaution, the Brake Energy Regeneration system monitors the level of battery charge and will, if necessary, continue to charge the battery even during acceleration to prevent a complete discharging of the battery."
     
    Last edited: May 12, 2019
  5. 12 May 2019 at 12:40 PM #25
    Pdelamare

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    From the impression I got in my Caterham, it adds more feel and directness, rather than adding performance. I’ve yet to actually try in in my M3.
     
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  6. 13 May 2019 at 4:01 PM #26
    Ant Man

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    Phil - you may have already read it but a regular track goer on m3post gained 0.0 seconds at his favourite track when he swapped to a carbon fibre drive shaft. He did say it felt quicker but as the saying goes 'the stop watch don't lie...'
     
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  7. 13 May 2019 at 4:06 PM #27
    Ant Man

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    Thanks. I'll add this info to my notes. I've had the stop / start coded out.
     
  8. 13 May 2019 at 4:16 PM #28
    Nunga

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    https://lithiumax.eu/

    Much much cheaper than Litebloxx, and available through Burkhart Engineering. The big one weighs 3.6kg and costs in the vicinity of €700. It is definitely what I’ll be buying to replace my current battery.
     
  9. 15 May 2019 at 10:45 PM #29
    ttdan

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    I have a Braille IC48, 4.5kg, bit spendy but have had it in and out of a couple of cars. These things last years too so they can be thought of as economical with the correct man maths applied. Cars spins much quicker on start up too. Can sit for ages and still have loads of power although I do keep it on a lithium ctek tender.
     
  10. 17 May 2019 at 3:55 PM #30
    Scott

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    Thanks for the information, very useful.

    When you say the alternator disengages, what do you mean? I assume you mean it disengages the load side (ie. opens a switch to stop charging the battery) because physically the alternator will always be connected. Therefore while I accept disengaging the load will reduce burden on the alternator and in turn the engine, I do not believe it will be that significant. However, without seeing calcultations then I suppose we must trust the smart guys at BMW.

    Removing the IBS is solely dependant on application. If you are looking to get the lightest car possible and only use it on track then I would be removing the IBS, relocating the battery behind driver seat and fitting an under drive pulley. All the weight loss would more than offset against the parasitic loss of engine power during acceleration in my opinion.
     
  11. 17 May 2019 at 7:49 PM #31
    mlhj83

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    There must be a clutch for the alternator otherwise it would be impossible for BMW to claim to save 3% of fuel with the energy recovery system. If the alternator remained physically engaged to the engine, then the parasitic loss would always be there, so BMW must have somehow created a system to physically disengage the alternator from the engine, and power the vehicle's electronics from the battery instead.

    But what you said is true regarding total weight loss (and it's overall gain) vs parasitic loss from removing all the IBS. If you're building a stripped out lightweight, it would certainly make sense to remove IBS totally.
     
  12. 22 May 2019 at 10:33 PM #32
    DuncS3

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    I had no idea the cars had IBS - lightweight battery was a big weight saving in my e46 so interested to go this route on my e92
     
  13. 23 May 2019 at 3:09 PM #33
    HookdexM3

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    I have an Odyssey PC1100 in mine. Decent weight saving, not as much as the LI batteries but it's a fraction of the price. Sits happily for a few weeks without issue.

    I'm having IBS coded out and removed next week.
     

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