BC coilovers vs CUP

Discussion in 'Suspension, Brakes, Wheels & Tyres section' started by Ahmed918, Mar 14, 2020.

  1. Evening all

    Can anyone comment on the transition from cup suspension to BC coilovers 7kg / 4kg set up?

    the roads around me are full of potholes and bumpy roads. Cup suspension i can live with, maybe if it was a notch firmer i could get used to it but if it’s knocking driveability and comfort out completely, will probs stay away

    It’s a daily, used as a short commuter, occasional weekend blast and even rarer track day once or twice a year although not had it out on track yet.

    just dropped from 19”s to 18”s - arch gap looks wild. It’s done about 40k so at some point rather than buying more cup suspension with altitude issues, thinking of BC’s

    thanks in advance
  2. I will give you my opinion ...

    The CUP suspension is really firm ... I run around 2/3 trackday a month with original suspension, Eibach springs and silver project camber plates. In my case I am thinking of a Bilstein B16.

    If you only do a track day once in a while, it is not worth spending on a suspension adjustable in height, hardness, with adjustable couplings, apart from the topic that it is a Chinese suspension.

    1- the camber configuration that you are going to set for the street, does not work on the circuit and vice versa
    2- on fast circuits you have to get off the car, on the street it will go touching the bottom.
    3- continuously you touching the oil tap because tou are going to notice the car very hard and then you isn't going to know in which position it was good.
    manugtt likes this.
  3. If you are getting dizzy due to altitude, you probably better off with some new cup dampers and some H&R srpings,
    they will lower the car without spoiling the handling, done this on my MK2 for daily street use and its a dream.

    This of course is only my feeling, but i know a few who has done similar changes.
  4. personal if its a DD and aim to keep it id just go with lower springs
  5. Appreciate all the responses

    will definitely consider just the springs upgrade I.e h&r or eibach’s and perhaps new CUP shocks too while i’m there

    i sat in a megane 250 with bilstein b14’s on the weekend albeit very briefly which felt tight, firm but still supple in damping and soaking up road imperfections. Costing around 800 new

    I guess a set of eibach’s / h&r would cost 200, CUP dampers all round another £200 ish so half the money to get rid of the altitude issues and maintaining as a DD.

    Sergio - how do your eibach’s and CUP suspension stand up on track? Appreciate you are doing 2/3 track days a month, would you be happy with your current set up if you doing say 3/4 track days a year?
  6. Hi Ahmed,

    The Bilstein B14 suspension is an ideal suspension for day to day, it comes to be an "improved origin CUP" suspension but with a threaded body and a narrow spring (perfect for setting adjustable top mounts!) a simple suspension that works perfectly.

    I need to change my suspensions because they have more than 140,000 km of circuit and DD and I have reached the point that I want to get more juice.

    The good thing is that I only use my car on the track and really, I don't care if it's a hard and bouncy car.
  7. manugtt

    manugtt RSM Club Member

    This thread has help me a lot!! B14 are in my mind for a future. At now I drive with cup shocks and AST springs, feels good but maybe are too much low.
  8. if there is no money for KW suspension buy grams springs on the stock cup dampers !!
    everything else will work worse than stock suspension! I had both bc racing and B14 kit and it is downgrade from oem cup!!

    Now I have KW v3 and I'm happy with them
  9. manugtt

    manugtt RSM Club Member

    Really?? I don´t know in a Meg, but I had B14 in many cars(Clio Sport cup, Gt Turbo, STI), and always works very good in my opinion. So I´d ask that, in this forum many people have hours and hours in tracks or fast road and your opinion is important to me. Don´t wanna waste my money!!
  10. i really liked the BC's on my mk2, had 8kg front and rear, maybe a bit much for just road use but on track was really great.
    I also have BC's on my mk3 10kg front and rear and on the road its really nice, was expecting it to be a hard ride but its not.
    Also BC's are adjustable for dampening, i believe B14's are fixed, with my BC's on the road i set to 5 clicks out of 30, works for me

  11. yes
    I sold bc and b14. damping is worse than on stock. suspension moves are very small. the car was constantly jumping and it was not comfortable to ride. it was okay on a flat road but on a bad road they don’t work at all. I had no worse suspension. even when I wanted to buy me here on the forum discouraged and they were right
    kw var3 or higher will give you superiority after stock cap.
  12. The B14 is an "improved CUP suspension" a threaded body and a narrow spring.
    I know the people of tecnoshock (manufacturer and official technical service of Bilstein in Spain) and they take the b14 and turn it into a clubsport suspension and adjustable in hardness, becomes a trackday suspension and comfortable for DD.
  13. let's not talk about remaking the suspension. I'm talking about what they buy out of the box
  14. manugtt

    manugtt RSM Club Member

    Sergio, I know Tecnoshock works, we send they a couple of suspensions of race cars for rebuild and very happy with them. Engimek, in Gipuzkoa works very well too.
    Thanks to all for answer, I want to read a few opinions more and will see what to do.:wink::wink:
  15. manugtt

    manugtt RSM Club Member

    Thanks Matthew! I didn´t found that thread, very interesting. Well, it seem like I must forgot the B14:tonguewink::tonguewink:
    Many of you speak about Grams spring. In Spain are´t know. In the web they say that the springs low 2,5cm, sincerely, I think that don´t deserve money to change my AST springs just for up 0,5cm. Maybe will spend that in a camber plates and give a plus to the OEM suspension.
    Thanks again, that help me and my wallet a lot!:grin:
  16. No problem
    I tried everything that I can
    Grams will be perfect if you don't want it to be too low.
  17. I just wanted to make to understand that the b14 is not a sports suspension. Many people think that it is, I know what I'm talking about.

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