Solid (aluminium) bushes for track car

Discussion in 'Track-days' started by Matthead, Sep 23, 2018.

  1. 23 Sep 2018 at 12:25 PM #1
    Matthead

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    I’m currently doing a fairly major refresh/overhaul of my track car ready to start again next year and as I’m stripping down various parts I’ve been thinking about the bushes. At the moment most of the bushes are powerflex purple with a couple of powerflex black series. Although there is nothing wrong with these I’m always looking to upgrade so I was considering going to solid aliminium bushes where applicable, rose joints for other areas and generally solid bushing the whole car.
    Pros and cons of this? I would assume LOTS more noise in the cockpit, but is it worth this for less slop in the bushes? The powerflex stuff seems up to task but can it be improved upon? My engine and gearbox have solid mounts and i do seem to have a lot of noise from that but then the car is noisy as hell anyway!
    Thanks in advance for any advice :thumbsup:
     
  2. 23 Sep 2018 at 8:30 PM #2
    Ripper46

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    Hi Matt, great work you are doing just now , as for the bushes , I have every bush either solid or rose jointed , as it’s a track only car I’d say yes do it , it’s noisy as you know but definitely worth it
     
  3. 24 Sep 2018 at 11:07 AM #3
    Matthead

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    Thanks Ray :thumbsup:
    Sounds good. I think on that recommendation I may go for it then. I’ve already changed the front lower control arm bushes for rose joints and have a new set of rose jointed, solid bushed rear camber arms so I may as well do the diff mounts as well.
     
  4. 24 Sep 2018 at 11:50 AM #4
    dhdev

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    I have solid diff mounts with powerflex black subframe bushes. I drive too and from the track and I'd previously thought it was fine, but on my last return trip my friend took all my equipment and spares in his van, so I had an empty car. OMG the noise from the diff was deafening (almost literally). 100dB for 2hr30mins has definitely done some permanent damage to my hearing :( On track with a helmet it's fine though!
     
  5. 24 Sep 2018 at 7:10 PM #5
    Scottyboi

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    :eek::eek:
    I’ve just put solid diff and subframe bushes on mine. Driving to the ring on Saturday. Should be fun. :muttley:
     
  6. 24 Sep 2018 at 7:13 PM #6
    dhdev

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    Is it stripped out? If it is the luggage should help dampen the noise a bit. But I would definitely recommend ear plugs as a minimum, if you’ve got em noise cancelling headphones
     
  7. 24 Sep 2018 at 7:33 PM #7
    Scottyboi

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    Rear is stripped, I have a makeshift mdf floor for the boot when I’m carrying loads of gear. Easier to strap down.
    Going to be a long drive for me and the passenger.
    To be honest, at 70mph you can get away with just talking a little louder than normal.
     
  8. 24 Sep 2018 at 8:31 PM #8
    evomilk

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    Most of mine is solid bushes only thing i would say is have to spanner check the car a bit more as things do vibrate loose
     
  9. 24 Sep 2018 at 11:21 PM #9
    philrob1

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    Solid subframe mounts will add little to no extra noise. All current M models come fitted with them. The difference over the stock rubber is staggering.

    The diff mounts are where you'll introduce the most noise.
     
  10. 25 Sep 2018 at 5:32 AM #10
    billyboym3

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    For your car matt your be fine, I had solid diff, subframe and rtab, to much for the road.

    My rear caliper come loose on way back from Donny.
     
  11. 25 Sep 2018 at 5:34 AM #11
    PolarisCSL

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    Depends how your diff was done to a certain extent.. mine is pretty quiet despite being solid everything.
     
  12. 25 Sep 2018 at 8:06 AM #12
    Matthead

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    Thanks guys that’s all great info.
    So can you actually feel any improvement in terms of less movement etc?
    Is it worth the extra noise? If I changed everything do you think I would genuinely say to myself, “hell yes it was worth going solid bushes” ?
     
  13. 25 Sep 2018 at 8:32 AM #13
    Scottyboi

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    I have powerflex black through the car, have had for a while.
    Had the solid diff and subframe bushes on a few days. Driving on the road, the rear of the car feels fully attached. Rears hook up instantly, feels a lot more stable when pushing on. The whine is addictive, if that’s your sort of thing. “The M clunk” is definitely magnified.
    I think it’s well worth while. The rear suspension is now doing the job it is actually meant to do, instead of soaking up the flex of the diff etc
     
  14. 25 Sep 2018 at 8:10 PM #14
    Matthead

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    My diff was built by drexler? I was quiet when the car was working!

    Interesting. I’m sorely tempted to change them for solid after this. I am concerned about the noise levels and potential vibration issues but if they improve handling noticeably then I reckon it could be worth it.
     
  15. 25 Nov 2018 at 8:53 PM #15
    Iain

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    i dont think the diff mounts being solid are worth a fig biscuit.

    Changed mine to solid, no improvement that i can feel, but a lot more noise, its the one change i have made that i regret. All other bushes have been fine, but these are arse.
     
  16. 6 Dec 2018 at 5:14 PM #16
    tblandy

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    So for a club sport car solid subframe but stock diff bushes? Any recommendations for solid subframe mounts?
     
  17. 8 Dec 2018 at 3:16 PM #17
    Mr Reeves

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    Hack engineering have a few different ones with the Bimmerworld ones probably being the most popular but I haven't a scooby on what the difference is between them all.
     
  18. 9 Dec 2018 at 8:57 AM #18
    Matthead

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