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328 redline rev'ing problem...

Discussion in 'Technical Q&A' started by rob lay, Mar 17, 2004.

  1. rob lay

    rob lay Administrator
    Staff Member Admin Social Subscribed Miami 2018 Owner

    Dec 1, 2000
    52,551
    Southlake, TX
    Full Name:
    Rob Lay
    I know the 328 has a 7,700 RPM redline or so, but it really sounds like mine is struggling past 7,200 or so. It goes strong until then and about there it struggles to get more RPM and sounds like it's really straining.

    It's done this since I owned the car. I've had it on the dyno and the numbers show a healthy 228 RWHP. I never got a print of the dyno run, but it did drop of all of a sudden in power past that 7k mark or so.

    I know the top power doesn't come at redline, but I wanted to see if there's something wrong. Can the engine be 100% healthy until a certain RPM? If so, what problem would this point to.

    I was talking to Ric Rainbolt Saturday and he just rebuilt his 348 engine. He said the most noticeable difference after the rebuild is how it revs at the top end.

    I'm really just looking for an excuse to rebuild my first Ferrari engine. ;)

    Thanks,
    rob
     
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  3. ricrain

    ricrain Karting

    Nov 1, 2003
    195
    Dallas Area
    Full Name:
    Ric
    Sounds like the fuel pump to me...
     
  4. Mitch Alsup

    Mitch Alsup F1 Veteran

    Nov 4, 2003
    7,674
    Most tired engines loose it in the low end before it becomes noticible in the top end. I suspect fuel or ignition.
     
  5. wimeldo

    wimeldo Formula 3

    Jul 24, 2003
    1,297
    (Spain)
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    Alfredo
    is possible a reading error in the rev counter???

    Greetings

    Alfredo.
     
  6. rob lay

    rob lay Administrator
    Staff Member Admin Social Subscribed Miami 2018 Owner

    Dec 1, 2000
    52,551
    Southlake, TX
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    Rob Lay
    No, because you can feel and hear the engine bog down and the dyno chart showed it.

    Shouldn't a 328 rev strong all the way up to 7,800+?
     
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  8. 4re gt4

    4re gt4 Formula 3

    Apr 23, 2002
    2,279
    Roseburg, OR
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    Hans E. Hansen
    Poor high rpm response can be caused by either airflow or exhaust being constipated. Cat conv issues often, but could be muffler too. As I recall, you have a K&N, so it's probably not intake - but wouldn't hurt to check.
     
  9. Mitch Alsup

    Mitch Alsup F1 Veteran

    Nov 4, 2003
    7,674
    Yep, forgot about exhaust constipation........
     
  10. f355spider

    f355spider F1 World Champ
    Rossa Subscribed Owner

    May 29, 2001
    17,316
    USA
    Rob, do check/confirm the accuracy of your tach. 328/Mondial 3.2 tachs are notorious for failing and reading several hundred rpm low. I personally know of four cars with this problem, mine included. I fixed mine last year.
     
  11. rob lay

    rob lay Administrator
    Staff Member Admin Social Subscribed Miami 2018 Owner

    Dec 1, 2000
    52,551
    Southlake, TX
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    Rob Lay
    I would think a 328 would rev to 10,000 strong if you wanted it to.
     
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  13. f355spider

    f355spider F1 World Champ
    Rossa Subscribed Owner

    May 29, 2001
    17,316
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    You're right Rob, I hit 8100 rpm a couple times last Saturday (accidentally), and it pulled without strain all the way up.

    Dave
     
  14. peterp

    peterp F1 Veteran

    Aug 31, 2002
    6,006
    NJ
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    Peter
    My car was weak above 7K until I had the exhaust recirculation hoses replaced, then it was much quieter and the power continues building all the way to redline. It made a huge difference in top-end power. Strangely though, it seem to have lost some of its mid-range power in the process. I would recommend looking at the exhaust.
     
  15. Auraraptor

    Auraraptor F1 World Champ
    Lifetime Rossa Owner

    Sep 25, 2002
    11,559
    MO
    I thought our limiter was at 7.7k?
     
  16. f355spider

    f355spider F1 World Champ
    Rossa Subscribed Owner

    May 29, 2001
    17,316
    USA
    Nope, none.
     
  17. abarthracer

    abarthracer Formula Junior

    Dec 6, 2003
    373
    Falmouth, Cape Cod
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    david S.
    I would hook up a basic vacuum/pressure gauge to the exhaust before the mufflers/cats and check your backpressure. The Shadetree mechanic guys did a episode on this recently and it is very simple. I want to say that you shouldnt have more than 4-5psi back pressure. At least it would tell you whether it is in the exhaust.
    David
     
  18. 4re gt4

    4re gt4 Formula 3

    Apr 23, 2002
    2,279
    Roseburg, OR
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    Hans E. Hansen
    Good idea. Also, a vacuum gauge in the intake system will detect problems in either the intake or exhaust. As I have no experience with 328 injection, I'm not sure where you'd hook it up.
     
  19. Corsa

    Corsa Karting

    Nov 1, 2003
    109
    Stockholm
    Full Name:
    Peter
    Some 328 have a 7700-7800 rpm limiter. I have heard that some of these rev limiters are adjustable.

    My 328 pulls strong up to the limiter. The tacho is insane though...

    Ciao
    Peter
     

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