F30 mods

Discussion in 'General chat' started by blackrat, Oct 8, 2019.

  1. blackrat
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    blackrat

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    Good afternoon all

    I have an F30, 335D Xdrive that I love but there are a couple of handling issues that I don't like and I want to seek the knowledgeable masses views before spending any significant money

    The car is a 2016 on 19 inch run flats, it doesn't have the adaptive suspension but is an Msport+ variant.

    I don't want to get into the debate about changing the tyres as I am more than happy with them and I personally don't see that there are any significant advantages for or against switching other than the obvious cost.
    That being said in relation to the tyres I have lowered the front tyre pressures by a couple of psi over the 38/38 that BMW recommend.
    I have found that the front doesn't wash out quite so much in (spirited) corners as it did do, it allows the fronts to flex a little more even with the stiffer side walls of the runflats so they are more compliant on the road
    I did the same with the cars I used to drive in my previous work and it made a world of difference when driving at speed as was frequently necessary, the feeling was that you could push the car a bit more into a bend and not end up in the hedge at warp speed nose first with lots of understeer.

    The point I want to ask relates to the suspension set up.
    I find the whole stance of the car looks wrong to me in that it rides very high.
    I have searched the interweb and found some interesting (car) porn particularly in relation to the F30 and suspension.
    The main change I have seen and am considering is changing the stock springs to an AC Schnitzer set up, they lower car by around an inch (25mm in Roman Catholic) without upsetting the standard damper settings overly.
    Photographs of cars with this set up look far more proportioned in my view.

    Has anyone made this change to their car be it similar or a different model and what are your thoughts.

    thanks
     
  2. Ers51
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    Ers51 Site Supporter

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    Got a kinda boy racer feel about it this post ...anyone coming in with some advice .

    ed.
     
  3. a.s.uk
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    a.s.uk

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    Dave @bishbosh
    Will be along soon and he’ll tell you about his bilstein set up which has considerably improved his cars handling...


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  4. Mieke
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    Mieke WARLORD Site Supporter

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    That's exactly what I would have suggested - replace the standard shocks and struts with Bilsteins. Not exactly an inexpensive mod, but you should see a significant improvement. Also, a sturdier anti roll bar and mounts would help. Starting to sound expensive . . . :whistling:
     
  5. kleynie
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    kleynie WARLORD Site Supporter

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    Agree, Bilstein is definitely the way to go (and ditch those runflats:eek:)
     
  6. bishbosh
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    bishbosh WARLORD Site Supporter

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    @blackrat your car has the same setup as mine does; m sport+, non adaptive suspension. I found the handling uninspiring to say the least, not just in spirited driving along country roads but also just pootling around, the main problems being that the springs are too soft and overly sprung, but with the dampers being underdamped. I found that on anything other than smooth roads the ride was jarring and not very comfortable. I don't know what your budget is, replacing just the springs will help with pitching/lifting, stance and cornering but the standard shocks really are woeful. I compared an original rear shock to a bilstein rear shock, compressing them and watching the rebound. The bilstein was slightly harder to compress but the rebound was 'purposeful' is the right word I think. The original shock compressed easily but the shock gave an 'if I must' attitude to the rebound with all the vigour of a hooker on the last punt of the day. It took a good 5 or 6 seconds to rebound fully. A shock that slow isn't going to respond quickly to uneven road surfaces.

    Anyway, I went for the Bilstein b12 kit, cost about £700 for the springs and dampers, but I also bought new top/bottom mounts from autodoc. Fitted it myself and paid approx £100 for an alignment.

    I can't compare to the acs offering as I've never been in a so equipped car. I have heard it's possibly slightly more comfortable, that's subjective though and how much of that is marketing fluff who knows? The acs springs lower the car a little more than the bilsteins. The cost for me was prohibitive, £1633 at the time of writing so more than double the cost, but I doubt double the benefit/performance over the bilstein offering.
     
  7. quinnj3
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    quinnj3

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    From the x-drive m sport cars I’ve seen online they appear to sit taller than my 2wd m sport plus. Some are saying the x drive m sport has standard suspension unless you opt for adaptive and do sit higher.

    I spend a lot of my time driving on poor surface B roads, I find my 2016 F31 is perfectly controlled on these roads bearing in mind it’s a family car not a sports car. I have the runflats and 19” wheels still on mine. I like it that much ill be fitting runflats again when the time comes.


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  8. bishbosh
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    bishbosh WARLORD Site Supporter

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    The F3x xdrive cars do sit higher as they have the standard SE suspension - even ones with M-Sport trim. I think even adaptive uses the same springs (different shocks obviously).
     
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  9. Singvogel
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    Singvogel Moderator WARLORD Site Supporter

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    Yet another reason I chose not to buy an x-drive. :whistle:
     
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  10. Mieke
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    Mieke WARLORD Site Supporter

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    The xDrive is 1 cm higher. I can't imagine that would make any noticeable difference, unless you're using it as a race car on track. :whistle:
     
  11. Singvogel
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    Singvogel Moderator WARLORD Site Supporter

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    The extra ride height would be useful on occasion - I could get a few more crates of Spatenbrau in the boot on the way home. :cool::beers: :drink:
     
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  12. madphysics
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    madphysics Site Supporter

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    My older F31 had adaptive xdrive and I think it dropped it back down to the normal msport height. I'd never get another xdrive without it again, my current one has SE suspension on a 335d xdrive. Couldn't get it without 4WD. As there doesn't look to be a replacement for the 35d it could be a 30d next with proper msport suspension again.. unless the mystical 340d does get released here in the uk....
     

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