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Thread: Rolling Road Power Graphs.

  1. #1
    spoons
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    Default Rolling Road Power Graphs.

    Hi All,

    ... and appologies to Pricey as I've taken his graph figures as an example.

    I've posted below my rolling road figures compared to a 'caterman' tuning box.

    Pricey got 193 BHP whereas I got 185 BHP
    Pricey got 272 lbft torque whereas I got 275 lbft torque

    So the two above cars are very closely matched.. I've spent loads of money... Pricey has been more shrewd and spent less money.. for what appears to be a better result.

    So I wanted to see why his figures appeared to show a more powerful car. Look at the graph below and it will give you an idea where the power is delivered compared to my car... and how this might have an effect when on the open road.

    Now I know for certain (cos I do it regularly) that my car will rev to 5,000 RPM... So why the operator only went to 4,000 RPM is beyond me ???

    I just thought this comparison may raise a few more questions.

    Last edited by spoons; 1st October 2007 at 00:24.

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

    Trim : very

    Engine : Z19DTH

    Year : Nosey

    Default

    Those figures are imposible, bhp = lbft * rpm /5252. So if you both had the same lbft at 4000 rpm then you both had the same power!?!

    Something is very wronge there.

  3. #3
    Regular Member Hideous's Avatar
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    I'm not getting my calculator out now, though it's clear you are getting some awesome power levels low down. But it seems to pretty much run out of puff at 3500rpm... why
    Shame that it doesn't seem to keep making more bhp higher up the rev range like most cars do up to around 4500 rpm for diesels - if you can sort that out you are almost certain to see 200bhp.

  4. #4
    [Ex]Admin Duncan's Avatar
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    The figures aren't everything Steve. People often read waaay too much into RR figures. A car with less peak bhp, and even torque, than another car may on the road be a much quicker car as it delivers the power to the wheels in a far better way. All the RR figures indicate are peak figures - a useful guide but doesn't mean one car will be faster than the other.

    Obviously the graphs will give a real indication of how the cars will perform on the road based on the steepness of the curves etc. and not going up and down like a roller coaster.

    Take my last RR graph (Stage 1 fitted) - simply because it's a graph I can find easily....



    Nice climbing power curve along with a steep climbing, but smooth, torque curve, tailing off gradually indicate would suggest that the car will pull strongly with no flat spots or jumps/dips in power delivery. The peak figures were 217bhp/249lbft which obviously indicate that it's got decent power, but they are peak figures and peak figures are simply that - they on their own do not give any other indication as to how the car will perform in real life.

    You could have a car that had a high peak bhp for example and drove like a bag of bones because the power is not being delivered nicely - the graph may be all up and down like a roller coaster.

    I wouldn't get too hung up about the figures TBH Steve, far too many people do - it's how the car drives that's important IMO.

    BTW - I heard you were given a lesson in the on the road power of BSR today?!

    D

  5. #5
    spoons
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    Quote Originally Posted by Duncan View Post
    BTW - I heard you were given a lesson in the on the road power of BSR today?! D
    lol - no... it was yesterday.

    I was doing quite well until mach 4.... and then my little diesel engine ran out of push..

    I saw the Saab afterburner kick in... as it disappeared... lovely !!

    Hmmm....

    EDIT: Which reminds me... Phil !!... stop slip streaming me dude... go get your own air !!

  6. #6
    [Ex]Admin Duncan's Avatar
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    Quote Originally Posted by spoons View Post
    lol - no... it was yesterday.
    Ah yeah - I meant yesterday! Drunken fingers! lol
    Quote Originally Posted by spoons View Post
    I was doing quite well until mach 4.... and then my little diesel engine ran out of push..
    I saw the Saab afterburner kick in... as it disappeared... lovely !!

    Hmmm....
    Can you face another BSR spanking when we next meet up?!

  7. #7
    Regular Member VectraV6CDTi's Avatar
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    Looking at your figures Steve, he didnt take it past 4000rpm as the bhp and torque were dropping off so no point in taking the revs any higher.
    However, price's figures hadnt yet peaked at 4000rpm, so that possibly why he kept on going on his.
    Last edited by VectraV6CDTi; 1st October 2007 at 01:08.

  8. #8
    spoons
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    Quote Originally Posted by Duncan View Post
    Can you face another BSR spanking when we next meet up?!
    Thats what you said last time....

    You know me... always happy to be the pace car !! ... so long as its safe

    Quote Originally Posted by VectraV6CDTi View Post
    Looking at your figures Steve, he didnt take it past 4000rpm as the bhp and torque were dropping off so no point in taking the revs any higher.
    Hey Andy... hows things ??

    Yeah... I suppose that makes sense... need to find a way of getting more power longer in the rev range.

  9. #9
    spoons
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    Quote Originally Posted by Duncan View Post
    Ah yeah - I meant yesterday! Drunken fingers! lol Can you face another BSR spanking when we next meet up?!
    Actually... technically we are both wrong lol....

    It was Saturday.... day before yesterday.... must go to bed now !!!

  10. #10
    [Ex]Admin Duncan's Avatar
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    Quote Originally Posted by spoons View Post
    Thats what you said last time....
    lol, well it was somewhat wet and not really the road for giving it the full beans. Oh yeah, and that was only Stage 1!

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