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Thread: Heading for the Rolling Road tomorrow

  1. #1
    Regular Member nutron's Avatar
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    Vehicle : Vauxhall

    Trim : very

    Engine : Z19DTH

    Year : Nosey

    Smile Heading for the Rolling Road tomorrow

    Had her on there two weeks ago and she was pushing out 161bhp at the road wheel but I wasn't satisfied so I sent the tuning box back for some tweeking.

    Going to run her with and without the box to compare this time and hope for nearer 170bhp at the road wheel...

    I was reading up about roaling roads a bit recently and I found a few references that suggest that a better result may be obtained by doing the max run in 4th gear so I may give that a go and see...

    What are other people getting (bhp wise) at the road wheel?

  2. #2
    Regular Member nutron's Avatar
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    Vehicle : Vauxhall

    Trim : very

    Engine : Z19DTH

    Year : Nosey

    Unhappy Not too good...

    Got an increase in low down torque and held power for slightly longer but there is no increase in the max power at all

    So I'm going to take a trip up north and see if they can't sort it out for me, not far to go (185miles )

  3. #3
    Regular Member installer's Avatar
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    Abyss is right mate.
    Most `proper` places will mostly agree on 20% ish on tranny losses.
    If you want a very entertaining read and factual eye opener go on VVOC and do a search on `transmission losses`.
    There are pages and pages and pages of it.I started some of them and `discussed alot on there when did my v6.
    Think there is a calculation on there that is generally accepted now as a way to work out your fly fig.

    I think you can confidently say your at 200 bhp+.

    I (along with others) just leave them to it.It can raise many ugly heads.

    Make sure you get a before fig before you do anything else to it and try to all ways go to same place = consistincy.

  4. #4
    Regular Member barney's Avatar
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    what is the standard 150 cdti at the wheels? Iwould have thought it would be around 120 + and with the box on you getting 160ish at the wheels I dont think thats too bad really.

  5. #5
    Regular Member nutron's Avatar
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    Vehicle : Vauxhall

    Trim : very

    Engine : Z19DTH

    Year : Nosey

    Unhappy There is a small problem....

    The bhp at the wheel was an estimate made using a ruler on a monitor so it isn't acurate.

    I went back and got 181bhp estimated at the fly wheel and watched to needle rise this time. Only got 146bhp at the road wheel. so not anywhere near as much!

    The manufacture guarentees 185bhp at the fly wheel, so I'm not there yet.

    Ran the car without the box and got 144bhp estimated at the fly wheel (not far off the manufactures claimed 148bhp (150ps)) so I'm fairly confident in these figures.

    I've also seen an increase in fuel ecconomy again since they returned the box as the torque has increased low down allowing me to change up gear sooner.

    I'm still not getting as much torque as I had with the tunit box though and the torque is growwing slower and peaking later.

    I've tried to attach my power/torque graphs, hope it works.

    http://www.vectra-c.com/forum/attach...ntid=280&stc=1

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    I'm running a Diagnostix CR1 box and my figures are 193.4bhp (fly wheel) & 306.4lbft. I have a K&N Panel filter and Powerflow cat back exhaust.

    Should have some new figures for you all after the pressure in the turbo is increased and NOS if fitted.

  7. #7
    Regular Member nutron's Avatar
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    Vehicle : Vauxhall

    Trim : very

    Engine : Z19DTH

    Year : Nosey

    Default Where are you going to get the turbo pressure pumped up?

    I was thinking about trying to get that done, are you doing it through programing or with a piggy back to the manifold pressure sensor?

  8. #8
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    Piggy back mate. Mike at diagnostix is working on the electronics as we speak

  9. #9
    Regular Member nutron's Avatar
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    Vehicle : Vauxhall

    Trim : very

    Engine : Z19DTH

    Year : Nosey

    Default Good plan

    I was talking about that in a thread couple of days ago, I'm sure I have asked them before up there too... or maybe I ment too... I forget. I'll ask him about it while I'm up there.

    Principle is simple and I could do it myself, but I have no way of knowing how much I would be increasing by and have no way of taking readings from the car to see if it's healthy. So I decided not to try myself (mainly because I couldn't wasn't sure I had identified the inlet manifold pressure sensor)

    Something I am going to try though it insulating the air hose from the inter cooler to the manifold. It goes past the engine to the manifold at the back and gets very hot. If I can insulate it and perhaps even rig a crude cooling methord such as an electric water pump and half a dozen coils of a water pipe around it. Just a few degrees would give more power.

    Thought about NOS too but that would cause serious warrenty issues. Even when removed traces of NOS would remain and be tracable be Vx.

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    What about Methanol Injection?

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