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need help my sc14 has made my car slower

Discussion in 'V6 Development And Modification' started by Matt_vp, Oct 28, 2006.

  1. Matt_vp

    Matt_vp Donating Member

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    :ranting: ok got my sc14 running the other night and it feels like it has halved the performance of my car. when i put the foot to the floor from standing start it is really sluggish and doesnt want 2 go, when driving along and nail it to about 3/4 throttle it takes off and goes well but if i go full throttle its like the charger isn't even there. Went out driving 2nite and got beaten by a au falcon ute v6 manual, vn v6 auto, and a few vs i can normally beat by a couple of car lengths. i dont know whats going on the charger is in good nick and has been fully rebuilt before i put it on. so if anyone that has played with these charges has any ideas i could really use some help. :bang: :bang: :bang:
     
  2. greenfoam

    greenfoam New Member

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    Hellllllllllo :)
    Got a boost gauge? if not get one, then see if you are making any boost, if not check for belt slip, leaks.

    Got boost?
    Fix the tune

    Actually I just noticed you live in queensland, no way in a fit you will be able to run 3lbs of boost on the stock VN timing up there
     
  3. Matt_vp

    Matt_vp Donating Member

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    thanks greenfoam
    its making boost for sure (it has blow a hose off a couple of times before i got proper hose clamps.
    as for a tune is there anyway u could burn a eprom for me if i send u some cash. I think i can mod my spare memcal.
    (u need 2 delete some pms)
    Thanks Matt
     
  4. greenfoam

    greenfoam New Member

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    I could but it's much better that you invest the 70 bucks into a eprom burner if your going to live your life with a boosted commodore. Things will change, boost will go up, turbos will go on. It's better to be able to retune it as needed. Then I can just email you a little one bar tune to get you started so it runs how it is, no stress. I don't like stress :)
     
  5. Matt_vp

    Matt_vp Donating Member

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    no need for u 2 stress but it would b great if u could burn me one just 2 get started, i need it running properly cause this is embarrising being beaten by stock commodores and n/a fords with a boosted car.
     
  6. greenfoam

    greenfoam New Member

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    Ok find me in msn, am I findable?, hope so
     
  7. Matt_vp

    Matt_vp Donating Member

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    i tryed 2 add u 2 my misses msn but it isn't working
    r u logged on 2 msn
    Matt
     
    Last edited: Oct 29, 2006
  8. ashzv6

    ashzv6 New Member

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    yep performence loss.
    crs quote no performance loss with the kit off.
    the sad truth is that is propergander, compleatly untrue.
    u must suck your air in through stationary turbines.
    which will create a massive restriction.

    http://forums.justcommodores.com.au/showthread.php?t=42402

    and it will run slightly rich with the blower blocking up the intake when its turned off.

    i discussed this topic a while ago.
    i recon u lose 10% power with the blower off.

    do u mean u arent goin as fast as u should be with the blower on?

    first thing i would do is get a boost gauge.

    basically with the blower off put your foot flat on the accelerator in 1st or 2nd, it should go strait to 0psi if the blower wasnt there. if the blower is and turned off it might go to -1 or -2psi, meaning it is definetly restricting the intake.
    this is costing u horsepower.
    but dont worry, u shouldnt really be going full throttle with the blower turned off, unless draging a 4banger.

    now having said that(or typed it) the blower should register between 2 and 3? psi when you flatten your foot in first or second or so on. this really depends on your fuel system. i think another member on this forum got 4psi or even 5 from the stock pully. this was with a rising fuel pressure regulator.
    but i am unsure about which 1 to get.

    And greanfoam. where would i be able to get myself a eprom burner and is there a thread u can link to using 1? cheers.

    and dont forget to take off your pcv hose and run it elsewhere.(airbox) so its not getting boost its getting vacuum.
    and if u havent removed it take out your bellmouth thing.
     
    Last edited: Oct 29, 2006
  9. Matt_vp

    Matt_vp Donating Member

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    yeah ash i mean with the blower on
    my pcv hose has been reloacted to blower inlet pipe but my bellmouth is kind of still in there i was playing around with moddify if in a couple of ways but it looks like it is coming out today. What size piping is everone using cause i made all my piping out of 3" thinwall stainless pipe, is this 2 big?
    Thanks Matt
     
  10. ashzv6

    ashzv6 New Member

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    noway would your piping be too big.
    the bigger the piping is the less the restriction.

    geez your car is slower with boost, wtf?
    must be a fuel or tuning issue.
    take out bellmouth first.
    are you running premium? crs recomend premium
    are you using a blow off valve?
    are your sure the blower is turning on and locking up the pully compleatly?
    is the belt slipping?

    im using the stock sc14 outlet pipe which is 2inchx 2 1/2 going into a silicon
    2inch-3inch adapter then a 3inch pipe with a metal show off valve welded on
    going into a 3inch right angle silicon adapter

    my inlet pipe is a pod than 3inch pipe going to a 2inch-3inch right angle adapter which is a big restriction
    pics below
     

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  11. Matt_vp

    Matt_vp Donating Member

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    Ok the bell mouth is out it made a little bit of differace when i first give it some, always run premium since i brought the car 3 years ago, yes blow off valve, the charger seems to be pushing heaps of air blown the pipe near the t/b a few times untill i got heavy duty hose clamps on there, just checked the t/b is opening 100% and it looks good, so i think it is a tuning issue, spark and lean fuel ratio
    greenfoams sending me a eprom and im buying a eprom burner next week so hopefully i can sort this out.
    Thanks Matt
     
  12. daron

    daron wizfiz

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    b4 wasting time on burner make sure leads on on right way round and plugs are good and vacuum line is corect cause adding one of these chargers do make power so if yours has gone down you have a prob somewhere and new chip wont do jackshit
     
  13. Matt_vp

    Matt_vp Donating Member

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    ok the leads r on the right way runs fine without the charger on. The plugs r brand new and working. and what vacume line r u refering 2, the one that blow off valve, it is good and the blow off valve works.
    Thanks for the suggestions though
    Matt
     
  14. daron

    daron wizfiz

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    the one that goes to car from bov
    when i did mine i origanlly had it to the rong spot till someone told me
    ops me silly
     
  15. Matt_vp

    Matt_vp Donating Member

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    yeh the bov is working fine i got it hooked up 2 the map sensor vacum hose
    I think its a tuning problem its like it is leaning out at high revs
    thanks matt
     
  16. daron

    daron wizfiz

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    these blowers on stock motors do lean out but your saying it runs like **** and mine doesnt and heaps others dont so its not a tuning thing its a bad setup somewhere
     
  17. greenfoam

    greenfoam New Member

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    He's had it pinging at 4600 rpm, so it must the retarding the spark heaps and to do that it must also be running very very lean, why it it running leaner than other peoples? maybe there's another problem with the fuel system, I dunno. I just hope I got the tune right :)
     
  18. Matt_vp

    Matt_vp Donating Member

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    I brought a boost gauge 2 day and set it up at work, went for a drive all good up 2 3/4 throttle boost gauge reading 4psi then when i mashed it 2 the ground it went back 2 0psi, went back 2 work and had a think, checked for leaks, no leaks, the problem was that i was 2 lazy to run wiring for the pully so i hooked it up 2 the air con and was using the air con switch 2 turn it on since i dont have the belt running around the air con pully, i think at wot it wasn't getting enough power to the magnet on the s/c pully for it 2 hold and it was just slipping, so i wired it up 2 a switch near the gear selector and went for another drive and at wot it is reading 4psi, and has some go at full throttle but is still slightly pinging. But its getting there.:)
     
  19. daron

    daron wizfiz

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    heheeeh see told ya something was rong
    4psi is good most wont even make it to 3psi
     
  20. Matt_vp

    Matt_vp Donating Member

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    yeah thanks u got me thinking
     

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