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Thread: Vectra VXR 345mm Set-up

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    Default Vectra VXR 345mm Set-up

    Right,

    I have everything now to fit these bar the discs (picked up the front pads today). I'm unsure now if I want to fit them due to the increase in un-sprung weight. Will I notice a decrease in the performance of my 2.2 non-direct if I fit these?

    I'm now thinking the 314 set-up may be more suitable!

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    Moderator & Events Assistant paulhb's Avatar
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    Vehicle : M5

    Trim : Nothing needs adding

    Engine : 5.0 V10

    Year : 07

    Mileage : 37000

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    The 314mm and 345mm calipers are basically the same so not a lot of difference in unsprung weight if you want increased braking performance over the standard front discs then the 302mm 2.0T ones are a better option, if unsprung weight is your concern, also the rears should be uprated to 292mm IMHO as the 345mm setup will give a different brake balance to the car especially in the wet

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    Regular Member OPC's Avatar
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    Vehicle : Vectra-C

    Trim : SRi XP2 Nav

    Engine : 1.9 CDTi 150

    Year : 2008

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    The discs will weigh more but the 314 and 345 caliper are virtually identical, I can't see them slowing you down that you would notice, but you should make find time under braking

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    Quote Originally Posted by Lean6 View Post
    Right,

    I have everything now to fit these bar the discs (picked up the front pads today). I'm unsure now if I want to fit them due to the increase in un-sprung weight. Will I notice a decrease in the performance of my 2.2 non-direct if I fit these?
    You're confusing two different things, which tells me you're worrying about nothing. Unsprung weight does not slow a car down, because you could compensate for the increase in weight of the brakes by losing weight yourself, or having less fuel on board, or taking the tools out of the boot, etc etc etc. What you're referring to there is kerb weight.

    Unsprung weight is only the weight of the components that are located on the wrong side of the suspension - i.e. the wheels and brakes, because they don't benefit from the suspension effect of the springs. The downside of an increase in unsprung weight is a slight deterioration in handling. However, as your car is highly unlikely to be set up for optimal handling anyway, (i.e. does it have coilovers? Polyurethane bushes all round? The biggest ARB? Semi-slick road-legal tyres?) you won't even be able to notice the difference.

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    Thanks for putting my mind at rest guys. Rebellion, I think you're right; I'm confusing un-sprung weight with kerb weight. I'm going to fit coilovers to it soon and I'm also swapping my XP2 wheels for some pro race 1.2's.

    Another thing I didn't think of (don't know how), is the advantage of being able to brake harder and later before corners! I'll continue with the fitting of this brake set-up.

    Thanks to everyone who replied, all good points!

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