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Thread: Vectra C exhaust manifolds

  1. #1
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    Default Vectra C exhaust manifolds

    Jaspa, myself and Wazpaz discussed a few things at the Leeds rolling road earlier! The precats and the constrictive manifolds are one area where it may be possible to release some power on the 3.2 V6.(with full system, cam, and map). The manifolds below are starting points for us to consider.
    Comments / ideas guys
    Options so far are:

    Frederiech £750

    JP exhausts; approx £1080


    This is from aVVOC thread, estimates are less than £500, however these would need modifying for the C.

    "Can we sort a possible interest thread.......or add to this......... I know they not sorted yet, but just to give Peter at Longlife a rough guide on how many of us would like a set??

    Will be
    1. Tubular manifolds with as long primaries as possible that can fit into V6 engine bay
    2. Downpipes to suit........will meet up with standard system
    3. Decat sec, Removable for MOT, poss need to weld own section onto each side CAT
    4. Will be in thicker 304 stainless so no thin raspy noise
    5 Will be providing info so F28 box can be fitted so no gear linkage issues
    I dont think i missed any thing??? all in thread so far................
    List
    A WithE............ Deposit paid."

  2. #2
    Regular Member Jaspa's Avatar
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    Vehicle : Vectra

    Trim : GSi

    Engine : Z32SE

    Year : 53

    Mileage : 57,000

    Default

    ****** horrible bits of kit who ever tought eyy!

    yes, we are hoping to hear from RS tuning on monday if it is possible to electronically delete the downstream lambda sensor from the ECU.

    the reason for this is that these 'manicats' have upstream and downstream lambda sensors so having a tubular manfiold with straight through downpipe would ring the sirens with the ecu as the downstream would sense problems and bring on lights. limp mode etc.

    if this 'deletion' isnt possible then the only means of curing this problem is by stand alone engine managment. which personally i wouldnt justify spending the extra 800quid plus set up to run a ****** exhaust but we will see...fingers crossed.

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    Another way to get more power would be using nitrous. V6's respond well to nitrous(well the 2.5 and 3.0 do). Out of interest jaspa and paul, what fuel were you using when the car went on the rollers? My car runs on cheap supermarket fuel. Just wondered whether 'fancy fuel' would have made a difference to my figure?

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    my map was tweaked on Vpower and i have run on that all the time, the v power is supposed to be worth 5bhp anytime
    I wont be doing nitrous. I had hoped the 3.2 would have been stightly better.

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    It almost seems like the 3.2 doesn't like being modified from standard in anyway and if you do the gains are minimal. All I wanted when I got my gsi was a big air filter for induction noise as my previous car had itb so it sounded immense, but now i'm thinking about manifolds and remaps.

  6. #6
    Regular Member Ginge7289's Avatar
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    You are talking about spending £1000's just to gain 30BHP. It's nearly worth looking at the price of a new lump!

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    Davey moll does them manifolds on vvoc iirc there about 700 a set but a lot better than them pictured

  8. #8
    Regular Member Kev_A's Avatar
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    Vehicle : Vectra

    Trim : SRi

    Engine : Z20NET

    Year : 04

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    I was thinking of this route when I had my 3.2.
    Got quotes for a custom manifold back exhaust, cams, even looked in supercharging/turbocharging, in the end I decided it just wasn't worth it, the "bang for buck" ratio just wasn't high enough.

    I ran mine on a RR day with a cat back exhaust, de-restricted airbox, K&N panel filter and fresh plugs and it made 219.9bhp

    Instead of spending fortunes on power mods why not put the money into decent suspension mods, shocks, springs, ARB's, bushes and most importantly - Tyres!

    If you want to stick with the 3.2 then I'd just be happy with what it is, splash on a full exhaust and decent filter and that's about it.

    IMO, if you want something you can wring power from get something that's turbocharged.

    I took my own advice and went from my Vectra to a Corsa VXR, then a 400bhp Supra twin turbo, then back down to a Corolla T-sport compressor and finally came full circle to my current Vectra, an SRi-T as I needed a spacious family car.
    Last edited by Kev_A; 15th May 2011 at 09:57.

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    A touch of reality for us Kev.
    I actually have done the things you suggest first, as you should, brakes all EBC + yellow stuff, braided hose. Bilstein and Eibach suspension. bushes are not made for the vec and we have the largest oem arb's.
    always have the option for track tyres in summer and i have just bought some lighter wheels!
    I only wanted a bit more 'presence' which was when we dicovered the fueling characterisics!

    Quote Originally Posted by Kev_A View Post
    I was thinking of this route when I had my 3.2.
    Got quotes for a custom manifold back exhaust, cams, even looked in supercharging/turbocharging, in the end I decided it just wasn't worth it, the "bang for buck" ratio just wasn't high enough.

    I ran mine on a RR day with a cat back exhaust, de-restricted airbox, K&N panel filter and fresh plugs and it made 219.9bhp

    Instead of spending fortunes on power mods why not put the money into decent suspension mods, shocks, springs, ARB's, bushes and most importantly - Tyres!

    If you want to stick with the 3.2 then I'd just be happy with what it is, splash on a full exhaust and decent filter and that's about it.

    IMO, if you want something you can wring power from get something that's turbocharged.

    I took my own advice and went from my Vectra to a Corsa VXR, then a 400bhp Supra twin turbo, then back down to a Corolla T-sport compressor and finally came full circle to my current Vectra, an SRi-T as I needed a spacious family car.

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    Quote Originally Posted by tomo41 View Post
    Davey moll does them manifolds on vvoc iirc there about 700 a set but a lot better than them pictured
    I understood JP (local to DaveMol)made them for Dave! I will ask.

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