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Thread: Whats the diffrence between psi and bhp

  1. #1
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    Default Whats the diffrence between psi and bhp

    Ive got 150 psi vectra sri what bhp is it. Iam new to all this but got to start some where

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    Regular Member Ian's Avatar
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    Pinched this from Wickepdia - I hope its explains -

    Metric horsepower
    Metric horsepower began in Germany in the 19th century and became popular across Europe and Asia. The various units used to indicate this definition ("PS", "CV", "pk", and "ch") all translate to "horse power" in English, so it is common to see these values referred to as "horsepower" or "hp" in the press releases or media coverage of the German, French, Italian, and Japanese automobile companies. British manufacturers often intermix metric horsepower and mechanical horsepower depending on the origin of the engine in question.

    Metric horsepower, as a rule, is defined as 0.73549875 kW, or roughly 98.6% of mechanical horsepower. This was a minor issue in the days when measurement systems varied widely and engines produced less power, but has become a major sticking point today. Exotic cars from Europe like the McLaren F1 and Bugatti Veyron are often quoted using the wrong definition, and their power output is sometimes even converted twice because of confusion over whether the original "horsepower" number was metric or mechanical.

  3. #3
    Regular Member john_k_sri's Avatar
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    Vehicle : Vectra

    Trim : SRI NAV XP

    Engine : 1.9 CDTI 150

    Year : 2007

    Mileage : 72K

    Default

    I assume you mean 'ps' not 'psi' (used for tyre pressures, amongst other things) . You wouldn't get very far with that much pressure in your tyres.

    'PS' is the European equivalent to 'bhp' and is almost the same.

    Up to about 100 PS the bhp figure is 1 less : so 100PS is 99bhp.

    Between 100 and about 200 it is 2 less: so 175PS is 173 bhp,

    and over about 200PS the figure is 3 less: so 250PS is 247bhp.

  4. #4
    Regular Member nutron's Avatar
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    Vehicle : Vauxhall

    Trim : very

    Engine : Z19DTH

    Year : Nosey

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    Um, no.

    150ps = 148bhp for starters

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    Regular Member JuzzyD's Avatar
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    Quote Originally Posted by john_k_sri View Post

    Between 100 and about 200 it is 2 less: so 175PS is 173 bhp,
    Quote Originally Posted by nutron View Post
    Um, no.

    150ps = 148bhp for starters
    Isn't that what he said?

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    Regular Member nutron's Avatar
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    Vehicle : Vauxhall

    Trim : very

    Engine : Z19DTH

    Year : Nosey

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    There are :

    0.7457KW per imperial HP
    0.7354988KW per metric HP

    So 100hp = 101.387ps
    150hp = 152.0805ps
    e.c.t.

    roughly 1.01387ps per hp

    175hp does = 173ps if you round off the 172.6ps

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    Regular Member Marty J CDTI's Avatar
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    Don't you just hate the clever ones lol, Nutron what job do you do by the way other than underline stuff in red pen lol haha

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    Regular Member nutron's Avatar
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    Vehicle : Vauxhall

    Trim : very

    Engine : Z19DTH

    Year : Nosey

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    engineer...

  9. #9
    Regular Member john_k_sri's Avatar
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    Vehicle : Vectra

    Trim : SRI NAV XP

    Engine : 1.9 CDTI 150

    Year : 2007

    Mileage : 72K

    Default

    Quote Originally Posted by nutron View Post
    There are :

    0.7457KW per imperial HP
    0.7354988KW per metric HP

    So 100hp = 101.387ps
    150hp = 152.0805ps
    e.c.t.

    roughly 1.01387ps per hp

    175hp does = 173ps if you round off the 172.6ps
    Surely you meant to say '175ps does = 173bhp if you round up the 172.6bhp'

    No matter. The point of my post was simply to illustrate the differences between bhp and ps using round figures and without formulae.

    The estimates are close enough as to make no real-world difference.

    Manufacturers themselves use rounded figures in the names of model variants such as TDI 140, TDI 170, TDCI 115 etc etc.

  10. #10
    Regular Member Marty J CDTI's Avatar
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    Quote Originally Posted by nutron View Post
    engineer...
    ditto, jus doing a degree in Marine Engineering at the moment.

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