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Thread: Answer this then! Rolling Road Result

  1. #1
    Regular Member Maverick's Avatar
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    Default Answer this then! Rolling Road Result

    Since I fitted the twin exhaust, I really thought the car felt stonger low down and pulled better from mid range to the limiter at 5000rpm.

    Now I have been around long enough to know these things can be psychological and it's all in your head, so I put it down to that. But since I fitted it, I swear it was way better than before.

    However, I was talking to a German colleague at work last week and he told me a story that did the rounds on German forums a few years back, that ALL Signums (exc 1.8) from 2004 were supposed to have twin exhausts as standard to enhance the executive image of the car, but only the 1.8 and 1.9's from 2004 had a single. The centre section of the 1.9's exhaust is the same diameter as the 3.0 V6 CDTi, but reduces a little into the single back box.

    There was talk that the 1.9 150's with twin exit exhaust set up during development were producing more than 150bhp and that the engineers at Opel had to get the car back to 150PS for type approval purposes and to fall into line with the rest of the 1.9 range. How much of this is truth I don't know, but the figures in question were up to 167bhp.

    Fitting the 3.0 twin rear silencer assembly does make the system less restricture for sure, just looking at the two set ups clarifies this.

    So I decided to put the car on the rolling road to see if it was true.

    My result was 161bhp and 254lb/ft. It may be a little enhanced due to the fact that I run V-Power Diesel but the torque figure was 18lb/ft above standard. OK, not a massive amount over standard but good all the same.

    I know rolling roads should be used as a guide, but hopefully it has proved I am not going mad!

  2. #2
    On a Sabbatical daviek's Avatar
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    Result there buddy .... combined figures with a remap would be interesting

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    Regular Member shadow's Avatar
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    Do you know what your Bhp was before the mod. Fifth gear tested Vpower fuel on a recent program, and on a rolling road it added 5-6 bhp on a 150bhp citreon over supermarket diesel. So you may not be getting the improvement with the exhaust system that you think you are.

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    Regular Member Hideous's Avatar
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    Vehicle : Insignia

    Trim : SRi Nav

    Engine : CDTI158

    Year : 2012

    Default

    At the big Vec C rolling road meet (think it was in 2007) I distinctly remember one member with a bog standard 1.9 CDTI 150 producing 166 bhp. Went by the name of "Penfold" or something similar. And what made this event the more relevant, was a lot of other cars were tested on the same day; Spoons remapped CDTI put out about 185bhp, "caterman" boxed cars about 193bhp. Good, meaningful set of figures taken on that day.
    The engines are not all the same.
    Last edited by Hideous; 7th February 2009 at 00:52.

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    Regular Member shadow's Avatar
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    I just can`t see the standard one outlet exhaust knocking 17 horses off. I hope that i`m wrong cause want a twin exit box.

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    Regular Member Maverick's Avatar
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    Quote Originally Posted by shadow View Post
    Do you know what your Bhp was before the mod.
    Yes, 152bhp and 239lb/ft, so already a little up considering stock figures are 147bhp (150PS) and 236 lb/ft. So this 'small' increase may be down to the V-Power deisel. This was on the same rolling road in December.

    Quote Originally Posted by Hideous View Post
    At the big Vec C rolling road meet (think it was in 2007) I distinctly remember one member with a bog standard 1.9 CDTI 150 producing 166 bhp. Went by the name of "Penfold" or something similar. And what made this event the more relevant, was a lot of other cars were tested on the same day; Spoons remapped CDTI put out about 185bhp, "caterman" boxed cars about 193bhp. Good, meaningful set of figures taken on that day.
    The engines are not all the same.
    Your right it was 166bhp.

    Quote Originally Posted by shadow View Post
    I just can`t see the standard one outlet exhaust knocking 17 horses off. I hope that i`m wrong cause want a twin exit box.
    I can't, thats why I was very synical about the whole thing. But you don't know what the manufacturer may have done with the single exit rear silencer to get what they require.

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    The best exhaust for a turbo diesel is no exhaust. The freer the flow, the better.

    I had a 2.5" straight through Powerflow on my Mk4 Astra 2.0DTi and gained 4hp and 58lb-ft of torque. Yes, 58lb-ft! Pulled 228lb-ft at 1450rpm.

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    Going outside now...to saw the back-boxes off my V6.

    I thought that all the 'hard work' was done by the 'centre-box' ?
    Last edited by diesel dog; 7th February 2009 at 20:03.

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    Regular Member Maverick's Avatar
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    Quote Originally Posted by diesel dog View Post
    Going outside now...to saw the back-boxes off my V6.

    I thought that all the 'hard work' was done by the 'centre-box' ?
    I don't know about that, but the arn't the centre box's straight through?

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    Regular Member shadow's Avatar
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    Quote Originally Posted by _ZS_ View Post
    The best exhaust for a turbo diesel is no exhaust. The freer the flow, the better.

    I had a 2.5" straight through Powerflow on my Mk4 Astra 2.0DTi and gained 4hp and 58lb-ft of torque. Yes, 58lb-ft! Pulled 228lb-ft at 1450rpm.
    A straight through exhaust, I`m glad you don`t live near me.
    There`s a kid down the road with a scooter thing with a powerpipe on it. He revs the balls of it every morning. One day the thing will blow up hopefully.

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