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Bad day at the rollers

Discussion in 'Motors' started by Skywalker, 22 Jul 2006.

  1. Skywalker

    Wise Guy

    Joined: 3 Dec 2003

    Posts: 2,486

    Location: brighton

    Well just got back from the rolling road and all is not well by the look of things

    186.9BHP - Should be pushing 215
    140Torque

    Surely this is not right .

    BHP there is a flat spot of about 400rpm before VTEC which kicks in at 5600rpm
    Torque there is a 10lb drop just before VTEC then shots back up to 140

    Will scan the print out later but major annoyed at the results to be honest as they should be higher
     
  2. Psycrow

    Mobster

    Joined: 16 Jan 2003

    Posts: 4,948

    Location: Kirkcaldy, Scotland

    Glad I didn't buy it now ;)

    On a more serious note, what have you changed from standard? Could the rollers just be out?
     
  3. Skywalker

    Wise Guy

    Joined: 3 Dec 2003

    Posts: 2,486

    Location: brighton

    Only an induction kit has been put on it

    They could be out because an s2000 with a few grand spent on it only pulled 210bhp
     
  4. Serj

    Mobster

    Joined: 18 Nov 2004

    Posts: 3,581

    Location: Bournemouth

    Probably the heat and the humidity.
     
  5. djbenjo

    Mobster

    Joined: 18 Oct 2002

    Posts: 3,889

    Location: Manchester

    Aren't they 235 as standard?

    What was your at wheels figure?

    Do you have copy of the plot?
     
  6. Dolph

    Man of Honour

    Joined: 17 Oct 2002

    Posts: 49,357

    Location: Plymouth

    Apologies for an obvious question, but you're not looking at the 'at the wheels' figure are you?..

    Have you ever had the car on rollers elsewhere for a comparison? Or even better before the induction kit (as some of them are known to be crap)
     
  7. Psycrow

    Mobster

    Joined: 16 Jan 2003

    Posts: 4,948

    Location: Kirkcaldy, Scotland

    Even a crummy induction kit sucking in hot engine air isn't going to lose you 30bhp. As said, is that definatly at the flywheel?
     
  8. Matt82

    Capodecina

    Joined: 13 Mar 2004

    Posts: 16,600

    heat maybe leading to knocking? mine knocks and its no swearing me off, need to get a cure. optimax helps but there is an issue
     
  9. Psycrow

    Mobster

    Joined: 16 Jan 2003

    Posts: 4,948

    Location: Kirkcaldy, Scotland

    Oh yeah, are you running 98ron fuel? If not, WHY NOT!
     
  10. Matt82

    Capodecina

    Joined: 13 Mar 2004

    Posts: 16,600

    i am on 98ron now, it helps a bit but doesnt cure it. i think it may be a knock sensor prob. maybe map sensor? who knows
     
  11. Gibbo

    Commissario

    Joined: 17 Oct 2002

    Posts: 34,105

    Location: OcUK HQ

    HI there

    Which rolling was it?
     
  12. Skywalker

    Wise Guy

    Joined: 3 Dec 2003

    Posts: 2,486

    Location: brighton

    Sussex Performance Centre in Horsham
     
  13. Psycrow

    Mobster

    Joined: 16 Jan 2003

    Posts: 4,948

    Location: Kirkcaldy, Scotland

    I meant skywalker not you :p

    djbenjo they are 212bhp as standard.
     
  14. Gaijin

    Don

    Joined: 18 Feb 2003

    Posts: 8,550

    Location: Brighton/West Wicklow

    I'll give a bit of background. Not crapping on your thread mate but I think it gives them a better perspective.It was a Honda Revs meet and EVERYONE was well down on expected figures.

    Both S2000's achieved fly figures of around 213bhp (~240bhp stock and one had extensive Spoon modifications), A standard and well looked after VTI like mine (5DR 169bhp stock) achieved 158bhp. Mine achieved 174.6bhp (modified), and another mildly modified one achieved 162bhp.

    Most cars were modified in one way or another but most failed to get even stock figures - EVEN stock cars. I think mine was one of the only to do so.

    However, Skywalker's ATR was particularly low down for reasons unknown (should be pushing 210bhp stock)

    I'll post my graph when I get in from work.

    So is it a case of an under-reading dyno or a true down to the wire dyno?
    The operator was very defensive of the machine and said few vehicles achieve stock power figures on his machine and that the machine could not be manipulated to be generous like the Sun and other Dyno's. He was adamant that his rollers were very near correct.

    I just wonder, is it that too many rollers are reading high these days to get client satisfaction? or is this dyno a problem case?

    I believe it was a Dyno Dynamics (Australia) RR if that helps.
     
    Last edited: 22 Jul 2006
  15. Hate

    Soldato

    Joined: 18 Oct 2002

    Posts: 7,175

    Location: Sussex

    was it a 2 or 4 wheel drive dyno ?
     
  16. L0rdMike

    Capodecina

    Joined: 3 Nov 2003

    Posts: 10,586

    Location: Southampton

    If all the cars were consistantly down say 10bhp then you could say it was the rollers.

    If one car does dire and the rest not then its the car no question.
     
  17. Skywalker

    Wise Guy

    Joined: 3 Dec 2003

    Posts: 2,486

    Location: brighton

    Im running optimax, short ram , platinuim plugs and thats is it . Having a look at another ATR dyno sheet it seems to have the same lines as mine but the tourque and bhp are lower down the graph but same patteren - The guy was saying to me that the car is runny pony and dropping petrol like a turbo and then I asked if he had ever done an ATR and his reply was "nope" so that shows a nice little bit of knowledge . The guy said my car should be running very slow compaired to the 6.1 it should be running but I was passing the VTI's nicely to be fair so there is no doubt that its running fine in my eyes

    I just personally think the results where all down on what they should have been , A few other results for you

    EK9 - 160bhp - should be 185bhp
    S2000 - 213bhp - should be 236bhp
    S2000 with goodies - 218bhp - should be pushing 250
     
  18. Hate

    Soldato

    Joined: 18 Oct 2002

    Posts: 7,175

    Location: Sussex

    the short ram is probably bringin in hot air, but deffo not enough to kill that much horsepower - my bets on the dyno monkies
     
  19. Skywalker

    Wise Guy

    Joined: 3 Dec 2003

    Posts: 2,486

    Location: brighton

    Had an ambient of 32 in there so not the best of conditions but as you say definatly not enough to warrent a drop of 30 odd bhp for me
     
  20. thebrasso

    Soldato

    Joined: 18 Oct 2002

    Posts: 5,312

    Based on a few cars being down, I'd say its more likely to be the rollers.