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Thread: 118 bhp or 125 bhp

  
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    KevT.'s Avatar
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    118 bhp or 125 bhp

    hi peoplejust looking for some help. I have had my 1.8 sri astra mk4 on the rollin road and it come out with a 118 bhp and they said everything on the car was okay but since i have been told that my car should be 125 bhp so is this info correct and if so anyone else had this problem and what can you do to solve it

    cheers

    AOC top 15 car at PVS 2009 & 2010
    313.7bhp/343Ibft


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    first up when did the car have its last service ??
    i had my car on the RR at a meet a few weeks ago and it got 121bhp on ron 95 it had its service 6k ago
    it went back on a RR after a oil change and for 137bhp and 141bhp on tesco ron99
    my car is a 115bhp car as well so it doing a few bhp over book
    it has a full exhaust an air box mods with k&n

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    ZS's Avatar
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    2002 should be the Z18XE, which should be 125hp on the nose. If it was pre-2000 then you'd have the X18XE1 which is 118hp.

    As danny says, check the oil (easy to do, take a drop of oil off the dipstick and rub between fingers, if it's really slippery like soap then it's OK), and also check when it was last serviced as air filter and plugs may need doing.
    2007 Metro Blue 5 door Mk5 Elite 1.7CDTI
    6th Vauxhall (4th Astra) in 10 years...plus a couple of other sheds...

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    it is a 2002 on an 02 plate and it last had a full service in April and it had oil + filter, fuel filter, air filter, new plugs and i had the cam belt done. the oil is still spot on clean and clear and feels silky.

    AOC top 15 car at PVS 2009 & 2010
    313.7bhp/343Ibft


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    rolling roads aint 100% accurate
    Vauxhall history - 13S | 14NV | C16XE | X20XEV

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    but it quite a fair bit out so either there is a problem or the garage or emplyee were completly wrong as driviong the car there dont seem to be a problem but i aint had a go of another 1.8 sri other wise i might see the difference

    AOC top 15 car at PVS 2009 & 2010
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    Rolling roads can only measure BHP at the wheels accurately, since that is where the reading is taken - they then add a fiddle factor to guesstimate engine bhp.

    The olny true way to get an accurate engine bhp is to pull the lump out and stick it on a engine dyno.

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    could you honestly tell a difference of 7bhp from the drivers seat?

    if you are happy with the car then ignore a RR figure which may not be 100% accurate anyway.
    Vauxhall history - 13S | 14NV | C16XE | X20XEV

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    Quote Originally Posted by ZS
    2002 should be the Z18XE, which should be 125hp on the nose. If it was pre-2000 then you'd have the X18XE1 which is 118hp.

    As danny says, check the oil (easy to do, take a drop of oil off the dipstick and rub between fingers, if it's really slippery like soap then it's OK), and also check when it was last serviced as air filter and plugs may need doing.
    Z18XE is 123 not 125bhp and the X18XE1 is 115 not 118bhp. Difference between the 2 is 8bhp. Those are the Vauxhall quoted figures for the engines.

    If it feels ok then I wouldn't bother. Of the opinion that RR figures are inaccurate anyway.
    52 Astra G 1.8, 18" Mille Miglia alloys, 325mm Brembo 4 pot conversion, Coupe leather interior, Raid strut brace, Whiteline rear ARB, Irmscher bits (skirts, Carbon steering wheel, Bonnet extension, M3 mirrors, boot & roof spoiler), Reiger Rear Diffuser & Front Bumper, Koni Adj. dampers, 35/30 Vogtland springs, Duplex quad exit ASCAR stainless exhaust.

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    Rolling roads are good in that they can give a baseline figure to judge the effectiveness of any future mods, but only if you use the same one each time.

    I'd love to take the same car round all the RR's in the country (on a trialer) and compare the figures given at each one. I'm sure the results would give interesting reading

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