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  1. #1
    Regular Member Marky's Avatar
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    Default Thinking of lowering...

    I have replaced the rear dampers with B4s and changed rear control arms and front drop links.
    Soon I will be putting B4s on the front.

    As the car is 7 years old and done 135k I was thinking of changing the springs (fronts are still original, rears were replaced 3 years ago).
    Now I wasnt after lowering the car but the price of a set of Pi springs with a lifetime warranty is half of what VX want for a set of SRi spings. And it's only a 15mm drop over the SRi.

    Are the Bilstein B4s ok with 30mm lowering springs?
    And do you need to do the spring sleeve mod to front lowering springs or is it only needed for VX springs???

  2. #2
    Regular Member Dan_BlackSRi's Avatar
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    Vehicle : Vectra SRi

    Trim : XP1

    Engine : 1.9 CDTi 150

    Year : 2007

    Mileage : 66000

    Default

    The shocks will be fine with that drop, and when I fitted the PI springs on my old Vectra I fitted the sleeves on the front springs.

  3. #3
    Regular Member rozzer2006's Avatar
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    Vehicle : vectra

    Trim : VXR

    Engine : 2.8 v6 Turbo

    Year : 2009

    Mileage : 50k

    Default

    So can the car be lowered with out changing the shocks with these springs??? I dont want the ride any firmer but I want it lowered lol

  4. #4
    Regular Member Marky's Avatar
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    I did ask bilstein about this and they replied saying that the B4s are for standard springs. However they knwo people have added lowering springs with no problems but don't recommend it.

    On here people have said that you should be ok for 30mm lowering springs (the SRi springs are already 15mm lower than standard).
    Any lower and you need sports dampers that are specifically for lowering springs.

    Not done mine yet, waiting for some money and need to decide to go for Pi or Eibach.

  5. #5
    Regular Member rozzer2006's Avatar
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    Vehicle : vectra

    Trim : VXR

    Engine : 2.8 v6 Turbo

    Year : 2009

    Mileage : 50k

    Default

    yeah its ovb the travel of the dampers, so 30 mm springs should be ok u recon?? that would be fine anyway my sri rides quite low anyway

  6. #6
    Regular Member rozzer2006's Avatar
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    Engine : 2.8 v6 Turbo

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    Default

    sorry marky i just read that back sounded a bit cheaky lol,
    i might go for the 40's then, r u sure dan lol the springs didnt go lose due to the travel of the shocks when u jack it up??
    sounds to good to be true lol.
    cheers
    Quote Originally Posted by Marky View Post
    I did ask bilstein about this and they replied saying that the B4s are for standard springs. However they knwo people have added lowering springs with no problems but don't recommend it.

    On here people have said that you should be ok for 30mm lowering springs (the SRi springs are already 15mm lower than standard).
    Any lower and you need sports dampers that are specifically for lowering springs.

    Not done mine yet, waiting for some money and need to decide to go for Pi or Eibach.

  7. #7
    Regular Member 19CDTi's Avatar
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    Seen discussions on here stating standard shocks are ok til 40mm. Not done it meself so can anyone confirm or otherwise?

    HTH

    Stuart

  8. #8
    Regular Member Dan_BlackSRi's Avatar
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    Vehicle : Vectra SRi

    Trim : XP1

    Engine : 1.9 CDTi 150

    Year : 2007

    Mileage : 66000

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    Quote Originally Posted by 19CDTi View Post
    Seen discussions on here stating standard shocks are ok til 40mm. Not done it meself so can anyone confirm or otherwise?

    HTH

    Stuart
    I had PI 45/40 on my old Vectra SRi with standard shocks and had no issues what so ever, so I would say SRi shocks ok, wouldn't be too confident on non-sri shocks though.

  9. #9
    Regular Member 19CDTi's Avatar
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    Interesting note there Dan, thanks.

    Mine are above SRi so think I might just get away with standard shocks on 35mm

    Sorry for the hijack

    Stuart

  10. #10
    Regular Member Spelly's Avatar
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    Ive done this several times on Sri / Gsi Vec C's. You will be fine with a 40mm drop on the Sri shocks as long as they are in good working order. Its 40mm from standard height so will actually be a 25mm drop on an Sri. Just ensure that you get the correct springs that are matched to your axle weights (on a plate inside the drivers door B pillar) as some models require different spring rates. Ive always used Eibach and found them to be an excellent balance between ride and performance

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