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Thread: VPC Astra map - please discuss

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    Default VPC Astra map - please discuss

    I'm no expert on these matters, but when I look at the printout shown on here (you can zoom in a long way. I used 600%), a couple of questions arise in my brain.

    1. The 'sport button on' torque curve seems to be a mere peak, rather than a curve/flat line. Is this a good thing? I'm thinking probably not.

    2. Why do the plots for the 'sport button off' suddenly disappear at around 3.6K when they still seem to be going up?

    Thanks for reading!

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    Looks like a good graph, with the sport button on it seems to have pushed the power & torque lines up equally up the graph, still keeping the same profile.

    Although looks strange lines with the sport button off, looks like it has been plotted using the wrong axis

    Tim.

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    having another look it has been done different times so probably a different car/engine......

    File DATE 31/8/2005 Time 10:21:30
    157.3BHP / 3618 1/min (121mph) 267.7lbft / 2237 1/min
    VEHICLE astra h diesel 888

    File DATE 7/9/2005 Time 11:16:13
    196.6BHP / 3667 1/min (122mph) 335.2lbft / 2761 1/min
    VEHICLE astra diesel new software sport

    Didn't quite break the 200bhp barrier!!

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    Regular Member POAH's Avatar
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    Quote Originally Posted by simonali

    1. The 'sport button on' torque curve seems to be a mere peak, rather than a curve/flat line. Is this a good thing? I'm thinking probably not.

    down to the engine tune. the turbo certainly won't hold the boost and its probably not good for the engine to sustain 335lb ft. the turbo/engine will be able to sustain the lower torque figure across the rev range

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    Regular Member nutron's Avatar
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    Vehicle : Vauxhall

    Trim : very

    Engine : Z19DTH

    Year : Nosey

    Default

    Those graphs look very wrong, can't work out why though. the torque and power match up (i.e. about 280lbf, 196bhp @ 3700rpm, ish - 280*3700/5250 = approx 196bhp)

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    from looking at the graphs, it seems that they backed off the accelerator at 3600 rpm (dont know why), whereas they kept going with the sport button on.

    diesel torque curves are peaky, the engines dont "hold" peak torque like a petrol does, they peak early and steadily drop away. It maybe has something to with the fuel not being totally burnt at higher revs (diesel take a lot longer to burn due to the lack of spark)??

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    That truly is an amazing plot..

    The low down torque is phenominal, the sports switch off plot shows the same Torque increase as the tuning boxes provide (around 360Nm).. with the sports switch on, that jumps to 450Nm.. that is a large increase.. 236Lbft to 335lbft..

    The shape I think shows that the Turbo can't maintain that boost higher up, obviously the higher the RPM, the more air flow required to maintain the pressure, and the Turbo just isn't big enough, but it is allowing a very healthy 196BHP, which is not too shabby..

    IIRC, the sequential twin turbo was going to be limited to 450Nm because the 6 speed box couldn't take any more for reliability, assuming all our 6 speeders are the same, that would mean they are close to their 'safe' design limits..

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    Regular Member The Doc's Avatar
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    They modified the gearbox recently though didn't they?

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    Quote Originally Posted by phil-t
    assuming all our 6 speeders are the same, that would mean they are close to their 'safe' design limits..
    I'm sure Ian_C has looked into these 6 speed gearboxes and if my memory serves there's about 3 or 4 different varients. Plus the new 'Bullet Proof' one.

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    Alex - You have the model number for the new gearbox? Be interesting to see what one is on mine when they replaced it

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