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  1. #1

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    facing problem with the my riva fuel presure regulator ?

    my fzs yamaha have these upgrades :
    1-Riva sho / fz performance power filter kit
    2-RIVA Yamaha 1.8L Engine Breather Upgrade Kit
    3-R&D Power Core Intake Manfiold Sleeve (intake manifold upgrade)
    4-RIVA FX-SHO/FZ Power Cooler Kit
    5-RIVA FX-SHO/FZ Power Cooler Blow-off Valve Kit
    6-RIVA FX-SHO/FZ E1 Supercharger Impeller 16 PS
    7-R&D R3 ECU
    8-Water Box, Pro-Series; YAM SHO and HO 1.8L
    9-Riva FZR/FZS Rear Exhaust Kit
    10-R&D YAMAHA SHO/FZR ENGINE / INTERCOOLER COOLING KIT
    11-RIVA Fuel Pressure Regulator Kit
    12-R&D YAMAHA FZR/FZS AQUAVEIN INTAKE GRATE
    13-R&D Pump Seal Kit for R&D FZ intake grate
    14-13/25 Skat Trak Swirl Impeller

    - With all these modifications i reach 79.3 MPH with a half tank of fuel.

    -The problem i'm facing is that my air fuel ratio gives me 11.2 when the regulator is running 59psi on the regulator clock watch , so i have to adjusted to 50 psi and it gave me 11.9 on the air fuel ratio at the hight rpm , is it right ? because as i have known it should not be under 59 psi .






  2. #2
    lets race.... mikeFZR's Avatar
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    Hope this helps:

    Idle = 12.5
    2000rpm = 12.8
    2500rpm = 13.5
    3000 to 4000rpm = 14.0
    4000 to 5000rpm = 13.8
    5000 to 5500rpm = 13.7
    6000 to 6500rpm = 13.4
    6500 to 7000rpm = 13.2
    7000rpm = 12.7
    7500rpm = 12.3
    8000rpm = 12.1
    WOT = 11.8

  3. #3

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    is it right that the Fuel Pressure Regulator on 50 psi is safe for this ratio ? because as i have heard that is not safe to be under 59 psi on the regulator watch !!

  4. #4
    SHOBiz's Avatar
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    Quote Originally Posted by zx270 View Post
    is it right that the Fuel Pressure Regulator on 50 psi is safe for this ratio ? because as i have heard that is not safe to be under 59 psi on the regulator watch !!
    Seems kind of backwards. The Lambda needs to be correct regardless (relatively) of the fuel pressure.
    Use 55 psi of fuel and log the lambda then.

  5. #5

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    thanks man but when i use 55 psi the lambda give me 11.5 11.3 so its ok and , ifell the eccelerate is bet havey on this lambada log 11.3

  6. #6
    Kristian Keppel Waterholics's Avatar
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    I think the best man to talk to is hitman. Send him a PM. But I think your supposed to set your FPR at 55psi and tune with the powershot for the R&D ECU's. BTW is it static or rising rate ?

  7. #7

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    its rising rate from 11.6 11.8 on 51 psi

  8. #8
    Kristian Keppel Waterholics's Avatar
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    Well then remove the rising rate and see if you get your AFR's at around 11.9 @ WOT. I would think the lower the fuel pressure the better it would be for the fuel system. The less strain you would put on fuel pump fuel rail etc.

  9. #9

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    do u think that its will be better to remove the FPR

  10. #10
    Kristian Keppel Waterholics's Avatar
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    Quote Originally Posted by zx270 View Post
    do u think that its will be better to remove the FPR
    No way. You definitely need the FPR but what I suggested was to remove the rising rate feature.

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