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CIS fuel pressure test - correct values?

Discussion in '308/328' started by RGigante, Jan 13, 2008.

  1. RGigante

    RGigante F1 Rookie
    Project Master Owner

    Nov 1, 2006
    2,874
    Portugal
    A couple of days ago I've tested a friend's 328 fuel pressures. System pressure was ok (around 72 psi) and after turning the ignition off pressure would hold at about 40 psi. That means no problems with the accumulator or leaking injectors.
    The question is that when reconnecting the WUR pressure would start at about 0.8 bar (about 10psi) and slowly increase to 2.8 bar (about 40psi). According to Carl Rose's "Ferrari 328 CIS Fuel Pressure Check" those values should be between 1.4 and 3.5 bar.

    Can anyone please confirm these values? I can't find any reference for them, apart from Carl Rose's documentation
    Anyone been there, done that ?

    Thanks,
    Rui
     
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  3. Jbryant

    Jbryant Karting

    Sep 23, 2006
    220
    California City
    Full Name:
    Jeff Bryant
    I have the BOSCH K-Jetronic Service Guide.

    For A 1980 to 1983 308 GTSi and a 0 438 140 083 WUR, the values are as follows:

    Fuel Pump Delivery : 1100cc / 30 seconds

    COLD Control Pressure for a 0 438 140 083 WUR and full vacuum applied:
    MIN: 1.6 BAR at 10°C 2.0 BAR at 20°C
    MAX: 2.0 BAR at 10°C 2.4 BAR at 20°C

    Control Pressure WARM:
    2.5 to 2.9 BAR WITHOUT Vacuum
    3.3 to 3.7 BAR WITH Vacuum

    System Pressure:
    5.0 to 5.6 Checking Value

    Make sure that when you take the Cold Control Pressure, That you are applying Vacuum to the WUR. Approx 13 to 17 InHg

    Hope this helps

    Jeff
     
  4. RGigante

    RGigante F1 Rookie
    Project Master Owner

    Nov 1, 2006
    2,874
    Portugal

    Thanks Jeff!
    Would you have the values for a 0 438 140 116 WUR (euro version) ? My car is a euro.
    The values I've measured seem ok according to the ones above. Maybe there's no big difference between them ...
     
  5. Jbryant

    Jbryant Karting

    Sep 23, 2006
    220
    California City
    Full Name:
    Jeff Bryant
    What year and model? I can not seem to find the 116 WUR listed. The book I purchased is the service guide and specifications for the K-Jetronic (Basic System). It lists all the specifications for this system and lists all the part numbers. It covers Audi through Volvo cars. The section on Ferrari only covers 1980 - 1983 308 models. I guess that this was the only years BOSCH K-Jetronic (Basic) was used on Ferrari.

    Try this web site: http://www.boschtechinfo.com/index.cfm?event=home

    Lots of good stuff on Fuel Injection.

    Jeff
     
  6. RGigante

    RGigante F1 Rookie
    Project Master Owner

    Nov 1, 2006
    2,874
    Portugal
    Thanks, Jeff!

    My car is a 1988 328 GTS and I know that this reference was only used on the 3.2 euro model.
     
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  8. Verell

    Verell F1 Veteran
    Consultant Owner

    May 5, 2001
    7,001
    Groton, MA
    Full Name:
    Verell Boaen
    IMHO you're OK: With the exception of the Swiss (CH) 328s, all the injected cars used the #113975 injectors whose flow is pressure dependant. So under similar running/test conditions, the pressures for all models should be pretty closely matched.
     

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