Fuel Pressure/flow sensor placement

Discussion in 'PSI Superchargers Tech Questions' started by Comax Racing, Jun 1, 2011.

  1. Comax Racing

    Comax Racing Member

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    Just beginning my research on the best way to install my datalogger (RPM System). What is the best placement for fuel pressure & flow meter? I only have one of each for now, is it common to set up a fuel system to allow the sensors to be moved around in the system. Eg. Read flow after barrel valve for total engine consumption for a run then move it to right after the shutoff for total pump flow. Same with the PSI transducer? Seems to me if a person sets up the hoses and fittings correctly, moving these around should be pretty easy depending on what you want to log for a perticular run. Also I plan to use the Jetsize program as well (don't have it yet) if this will dictate where information is taken from.

    Thanks
    Corey
     
    #1
    Comax Racing, Jun 1, 2011
  2. Mike Canter

    Mike Canter Top Dragster
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    as far as the flow sensor you are only concerned with the total flow of fuel going into the motor. The standard configuration is to block off the lower angled output of the BV and change the oring to -8 adapter on the straight output to a oring to -10 then run at least 4" of straight -10 line to the flow sensor and 3-4" of straight -10 to a Y fitting that is a -10 in to two -8 out. One -8 line goes to the hat and the other to the ports. The flow sensor needs at least 4" of straight line going in and 3" straight line going out to reduce turbulance in the fuel or the accuracy and repeatability will suffer. You can still run a bypass off that angled output of the BV.

    As far as the pressure sensor you are going to have to decide what you are going to do with all this data. If you are going to buy Davenports Jetsize tuning software then the pressure sensor should be before the BV because Jetsize assumes it is there and computes a pressure drop across the BV.

    My recommendation is to buy Jetsize so you can tune the car from all the data you are now getting. You can calibrate Jetsize to the fuel pressure and flow data and every run is a flow bench calibration run. No need to ever get your system flowed on a bench anymore so that is a $800 savings right away.
     
    #2
    Mike Canter, Jun 1, 2011
  3. Comax Racing

    Comax Racing Member

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    Sensor placment

    Thanks again Mike that makes thing crystal clear.


    Corey
     
    #3
    Comax Racing, Jun 2, 2011
  4. Don Onimus

    Don Onimus New Member

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    Flow meter

    Mike Canter is the Man. His advice is from his knowledge, not from what he thinks it should be. I wish I lived near him. He would be my guy. Don
     
    #4
    Don Onimus, Jun 2, 2011
  5. Mike Canter

    Mike Canter Top Dragster
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    Don, it would cost you big bucks $$$$$$$$$
     
    #5
    Mike Canter, Jun 2, 2011
  6. Don Onimus

    Don Onimus New Member

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    fuel placement

    Yes, But worth every cent. !!!!!!!!! Don
     
    #6
    Don Onimus, Jun 4, 2011
  7. Top Drag

    Top Drag Wally Stelmach TD5560

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    Fuel Pressure Placement

    I am installing a fuel pressure transducer only on a blower system. (no flow meter) I have the davenport program. Just wondering if installing the pressure sensor before BV or at nozzle block would be better for fuel pressure data. I am running both hat and port nozzles with two seperate fuel line blocks with enderle BV.

    any help would be grateful.
    Wally
     
    #7
    Top Drag, Jun 4, 2011
  8. Mike Canter

    Mike Canter Top Dragster
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    The Jetsize software is designed for the fuel pressure sensor to be before the BV because there is a slight pressure drop across the BV and it is accounted for within the software. The understanding is that Les took an average of pressure drops observed on his flow bench and put it in his software. Having said that the software will also work with the pressure sensor after the BV because you can calibrate Jetsize to your fuel system with the Tuning Modifier. So if you are using the TM and the EGTs or plug readings then you will come up with a TM that matches your tuneup and everything will be good..
     
    #8
    Mike Canter, Jun 5, 2011
  9. Top Drag

    Top Drag Wally Stelmach TD5560

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    Thanks Mike. That is what I have been doing; Using the flow bench data, Tunning Modifier and Plug Reading. I keep running on the conservative side. Still learning this blower stuff and do not want to blow anything up. Decided to purchase a data system w/egts to get a little closer to good tune up and be able to watch what the engine is doing.
    Going to mount the sensor on the hat fuel line distribution block, thus be able to see the pressure drops during the whole run plus be able to see the egts. Davenports program wants to maintain a certain pressure during the whole run.

    Hope this sounds logical
    Wally
     
    #9
    Top Drag, Jun 5, 2011
  10. Mike Canter

    Mike Canter Top Dragster
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    Remember Jetsize is only computing the flow data from what you put in at 8000 or 9000 rpm in high gear. It is not maintaining anything or showing anything during the rest of the run.
     
    #10
    Mike Canter, Jun 6, 2011

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