Page 2 of 2 FirstFirst 12
Results 16 to 22 of 22

Thread: I dynoed my '09 ninja 250r today, but the figures dont seem right?

  1. #16
    Join Date
    25th August 2008 - 18:48
    Bike
    2009 Kawasaki Ninja 250
    Location
    no mans land
    Posts
    58
    this is the other sheet with hp and the air/fuel ratio

  2. #17
    Join Date
    15th March 2004 - 13:00
    Bike
    Austrian and Italian
    Location
    Glenfield, Auckland
    Posts
    4,687
    Quote Originally Posted by The Stranger View Post
    Random guess here.
    The reduction effect of the primary drive, gearbox and sprockets has the effect of multiplying torque.
    The values are relative to the rear wheel, not the engine.

    If so, the torque values are useless when compared to a bike that has been tested on a dyno which uses the engine RPM on the X plot.
    You are quite correct.
    These figures are at the wheel and not every dyno reads the same. Which is why (as pointed out) you should use the same dyno for all your runs after making changes so you can get a proper picture of the effects.

    The torque reading needs to be divided by the final drive ratio to get the torque at the engine. The sprockets and chain relate direct to pulleys in any physics lesson. Jump on google or wikipedia and learn about pulleys and their effect on torque if you want to understand why.

  3. #18
    Join Date
    15th March 2004 - 13:00
    Bike
    Austrian and Italian
    Location
    Glenfield, Auckland
    Posts
    4,687
    And while i'm here, showing it against speed is a pain in the arse. If you show it against revolutions you can work out the torque figure with a calculator.

  4. #19
    Join Date
    25th August 2008 - 18:48
    Bike
    2009 Kawasaki Ninja 250
    Location
    no mans land
    Posts
    58
    Ive loaded it on a wrong file type so it doesnt work but il download it later if anyones interested

  5. #20
    Join Date
    25th August 2008 - 18:48
    Bike
    2009 Kawasaki Ninja 250
    Location
    no mans land
    Posts
    58
    Quote Originally Posted by Devil View Post
    And while i'm here, showing it against speed is a pain in the arse. If you show it against revolutions you can work out the torque figure with a calculator.

    what about comparing speed with RPM on the road ie, I dont know in 4th now but I can soon find out, but I know in 6th and 50KPH im doing 3500RPM, I know that the dyno dudes went to redline. So couldnt I compare the speed such at 100KPH on the sheet where the peak is then go to 100KPH in 4th, see what RPM im doing and waalaa I have my RPM figure. sure its abit anal and a pain in the arse but I could do.

  6. #21
    Join Date
    5th August 2005 - 14:30
    Bike
    Various
    Location
    Auckland
    Posts
    4,359
    Quote Originally Posted by cameltoe View Post
    what about comparing speed with RPM on the road ie, I dont know in 4th now but I can soon find out, but I know in 6th and 50KPH im doing 3500RPM, I know that the dyno dudes went to redline. So couldnt I compare the speed such at 100KPH on the sheet where the peak is then go to 100KPH in 4th, see what RPM im doing and waalaa I have my RPM figure. sure its abit anal and a pain in the arse but I could do.
    You may find this calculator handy.
    It is set up for my XT at present.
    I used it quite successfully to locate fuelling issues with the PC map for better low end and top speed performance.
    Attached Files Attached Files
    Quote Originally Posted by Tank
    You say "no one wants to fuck with some large bloke on a really angry sounding bike" but the truth of the matter is that you are a balding middle-aged ice-cream seller from Edgecume who wears a hello kitty t-shirt (in your profile pic) and your angry sounding bike is a fucken hyoshit - not some big assed harley with a human skull on the front.

  7. #22
    Join Date
    15th June 2008 - 18:13
    Bike
    rego on hold nick smith special
    Location
    NZ
    Posts
    1,933
    Blog Entries
    1
    what? 14.5kg m? That's more than a 250 2 stroke or even 400cc bike!!! Something wrong here... or i don't understand lol...

    EDIT: just saw it's not kg m....

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •