Where'd my power go?

Discussion in 'General Technical Discussion' started by leebutts, Nov 13, 2007.

  1. leebutts

    leebutts 1 AYC Bar

    Joined:
    Jul 15, 2007
    Messages:
    3,365
    Likes Received:
    45
    Location:
    New Zealand
    First Name:
    Lee
    Drive:
    2001 Golf GTI
    Hi folks,

    I come before you today.... a broken man.

    I got took my car into APC Racing today (in Springwood for the QLD folk) and got it tuned as part of a service and AYC flush.

    Sadly it only pulled 129kw at the wheels :(

    It's completely stock and apparently has only done 37,000kms (I'm beginning to doubt this...)

    dyno-1.jpg

    Where do you think all my power has gone? I was hoping for 145-150 based on a 30% drivetrain loss.

    Apparently the AFR's were a little bit rich but nothing outrageous. Compression tests where all good. New plugs fitted today.

    Maybe I'm leaking boost?

    Lee
     
    Last edited: Nov 13, 2007
  2. Gly

    Gly Guest

    boost leak? low octane fuel?
    how many psi you boosting?
     
  3. leebutts

    leebutts 1 AYC Bar

    Joined:
    Jul 15, 2007
    Messages:
    3,365
    Likes Received:
    45
    Location:
    New Zealand
    First Name:
    Lee
    Drive:
    2001 Golf GTI
    Fuel has been 98 for several tanks since I got it.
    Don't have a boost gauge so not sure about the boost - might see if I can get one this weekend.

    That's all I can think it is. Is there any way to check the factory BOV for leaks?

    cheers

    Lee
     
  4. takumi

    takumi Guest

    Prolly a mix of the fuel and car age. A normal car will lose power as it gets older and parts wear.
     
  5. hawks

    hawks Leaving Skid Marks

    Joined:
    Jul 13, 2007
    Messages:
    1,330
    Likes Received:
    5
    Location:
    NSW
    First Name:
    Mark
    Drive:
    Sold my 1998 Legnum VR4 Type S
    The dyno guy should of hooked into the boost line so you could see what it was running. Check for leaks in the piping.
     
  6. bradc

    bradc 1 AYC Bar

    Joined:
    Jul 13, 2007
    Messages:
    8,253
    Likes Received:
    66
    Location:
    New Zealand
    First Name:
    Brad
    Drive:
    Facelift Manual 400hp VR-4 Legnum
    I would suggest resetting the ecu. Do you have the stock intake setup?

    You do need to find out what boost it was running as well as the AFR's!

    Most stock cars do around 150kw.
     
  7. leebutts

    leebutts 1 AYC Bar

    Joined:
    Jul 15, 2007
    Messages:
    3,365
    Likes Received:
    45
    Location:
    New Zealand
    First Name:
    Lee
    Drive:
    2001 Golf GTI
    I've reset the ECU a couple of times since I've had it and the intake setup is stock.

    I'll give them a call back tomorrow and ask if they recorded the AFR's and the boost levels.

    cheers

    Lee
     
  8. Sydo

    Sydo Leaving Skid Marks

    Joined:
    Jul 15, 2007
    Messages:
    632
    Likes Received:
    2
    Location:
    Victoria
    First Name:
    Andy
    Drive:
    Me Crazy
    If you don't mind me asking, what's making you doubt the km's?
     
  9. leebutts

    leebutts 1 AYC Bar

    Joined:
    Jul 15, 2007
    Messages:
    3,365
    Likes Received:
    45
    Location:
    New Zealand
    First Name:
    Lee
    Drive:
    2001 Golf GTI
    I'm not sure exactly :) the interior is in good shape, the engine bay is clean and tidy, no under body rust.

    The main thing is that the workshop thought that the noise I'd been hearing from the rear might be a worn wheel bearing - how many km's do wheel bearings last for? ...and the AYC fluid was pretty brown (but it probably would be after 37,000kms??).

    I'm just wondering if the lack of power could be due to a worn engine as takumi mentioned.

    cheers

    Lee
     
  10. Sydo

    Sydo Leaving Skid Marks

    Joined:
    Jul 15, 2007
    Messages:
    632
    Likes Received:
    2
    Location:
    Victoria
    First Name:
    Andy
    Drive:
    Me Crazy
    Sounds like mine.. At first glance everything looks mint, but after a while little things start to catch your eye. I have a little bit of wear on the steering wheel which is usually a deadset giveaway on true kilometres. No strange noises yet thankfully.

    The service records do seem to reflect the low km's though..
     
  11. DarkVR4

    DarkVR4 Leaving Skid Marks Premium Member

    Joined:
    Jul 17, 2007
    Messages:
    452
    Likes Received:
    0
    Location:
    Queensland
    First Name:
    James
    Drive:
    Black FL Reganum
    Thats No good Lee, it will be interesting to find out the cause. Just out of interest, how much did the service cost at APC?
     
  12. leebutts

    leebutts 1 AYC Bar

    Joined:
    Jul 15, 2007
    Messages:
    3,365
    Likes Received:
    45
    Location:
    New Zealand
    First Name:
    Lee
    Drive:
    2001 Golf GTI
    Don't ask :) my other half might be reading...

    I'm not sure what a service costs on it's own - I think for what I got which is a "major performance service" (which includes a dyno run and tuning if you had an aftermarket ECU) it's about 400-500.

    I got them to put Greddy iridium plugs in it at $28 a pop so that blew it out $650 *gulp*

    I think I'll try Neal Lowe next time - APC were ok but seemed pretty keen to sell me lots of expensive brand name stuff and the quotes I got for an exhaust were very different from what Christian was told on another occasion.

    cheers

    Lee
     
  13. Unique

    Unique Guest

    Hi Lee, if you need to borrow a boost guage just let me know. I am in Brisbane, happy to help out if I can. I am going down the wheel bearing path myself so might be able to assist you with that also.
     
  14. SiliconAngel

    SiliconAngel 1 AYC Bar

    Joined:
    Aug 7, 2007
    Messages:
    5,314
    Likes Received:
    78
    Location:
    Perth, WA
    First Name:
    SA, Trevor
    Drive:
    '99 Legnum VR4 Black MT
    Yea how'd you go with that, Graeme?
     
  15. Gly

    Gly Guest

    could also be a faulty wastegate/actuator.
     
  16. Kieran

    Kieran Guest

    Mmm... 175bhp ATW for a Manual car isn't great. That's what we see for completely stock Autos in the UK.:(

    That torque curve looks a bit flat - again, suggesting a boost leak, but without knowing the gear the run was in, etc it's difficult to say as one can't calculate the flywheel value to see if it's miles out or not.
     
  17. leebutts

    leebutts 1 AYC Bar

    Joined:
    Jul 15, 2007
    Messages:
    3,365
    Likes Received:
    45
    Location:
    New Zealand
    First Name:
    Lee
    Drive:
    2001 Golf GTI
    Hi Keiran,

    the run was done in 4th (according to the detail at the bottom of the graph). I rang them back today and asked for another graph with boost and AFRs on it.

    He said boost peaked at 9.8psi, will be interesting to see if it drops off suddenly at high rpms.

    cheers

    Lee
     
  18. bradc

    bradc 1 AYC Bar

    Joined:
    Jul 13, 2007
    Messages:
    8,253
    Likes Received:
    66
    Location:
    New Zealand
    First Name:
    Brad
    Drive:
    Facelift Manual 400hp VR-4 Legnum
    9.8 is reasonable, if it stays above 7psi for most of the run, then boost isn't the problem.
     
  19. Unique

    Unique Guest

    Lee, how does the car feel? Have you driven another Legnum or Galant to compare?

    A dyno is nothing more than a tuning tool, the outputs will vary at each dyno. A little fiddle with a couple of numbers on the computer and it is easy for your car to look like it is making more or less power. Call me cynical, but the aim of a performance shop is to sell parts to enhance performance.

    I have a boost guage in my garage that I am happy to let you use and a galant to compare with if you like.
     
  20. leebutts

    leebutts 1 AYC Bar

    Joined:
    Jul 15, 2007
    Messages:
    3,365
    Likes Received:
    45
    Location:
    New Zealand
    First Name:
    Lee
    Drive:
    2001 Golf GTI
    Hi Graeme,

    I've driven a tiptronic and my car feels quicker than that did.

    I hear what you're saying about performance shops :)

    Thanks for the offer of the boost gauge I'll send you a PM and try to arrange something.

    cheers

    Lee
     

Share This Page