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Complete Tundra fuel system testing and evaluation - pumps, injectors, rails etc. etc.

Discussion in 'Performance and Tuning' started by ViktorG, Jan 19, 2021.

  1. Jan 19, 2021 at 6:12 PM
    #1
    ViktorG

    ViktorG [OP] Lexus/Toyota Master Tech

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    Last edited: Jan 9, 2024
  2. Jan 19, 2021 at 7:48 PM
    #2
    RainMan_PNW

    RainMan_PNW SSEM #82 RGBA #4 “That Guy” Vendor

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    I’d have to see their pump curves, but it’s pretty common for advertised flow to be measured at the pump (i.e. no restriction) - in just about any industry. That’s why mechanical engineers need to see the pump curve across different losses to determine real flow for the spec’ed application.

    Looks like Aeromotive claims 325 LPH at 40psi, but that is still likely measured directly at the outlet of the pump. Any thing connected to that introduces friction/head loss and will reduce actual flow. Again... would have to see the real details of how they are claiming their measurement.
     
  3. Jan 25, 2021 at 3:33 PM
    #3
    ViktorG

    ViktorG [OP] Lexus/Toyota Master Tech

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    World's fastest supercharged Tundra - 2010 RCSB - 10.8 @122 - All wheel drive conversion, lowered, supercharged 2008 DCLB - All wheel drive conversion, 13" lift on 37's
    Last edited: Jan 9, 2024
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  4. Jan 25, 2021 at 4:16 PM
    #4
    Danimal86

    Danimal86 Looks clean even when its dirty!

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    Super cool!
    How was the spray of the s/c injectors compared to the stock ones? Same output shape, just a bunch more fuel coming out?
     
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  5. Jan 25, 2021 at 4:17 PM
    #5
    ViktorG

    ViktorG [OP] Lexus/Toyota Master Tech

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    Yeah, they are similar in spray pattern.
     
  6. Jan 25, 2021 at 11:13 PM
    #6
    assassin10000

    assassin10000 New Member

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    I'd look into the Denso fuel pump for the MK4 supra. You may want to consider upgrading the wiring to the fuel pump as well, depending on OEM wire gauge.

    390 LPH @ 40 PSI @ 14 Volts 9.5 Amps
    350 LPH @ 50 PSI @ 14 Volts 10.5 Amps

    273 LPH @ 40 PSI @ 12 Volts 8.3 Amps
    225 LPH @ 50 PSI @ 12 Volts 9.3 Amps

    From here:
    https://my.prostreetonline.com/2016/01/20/how-to-test-a-toyota-supra-fuel-pump/
     
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  7. Jan 30, 2021 at 1:13 PM
    #7
    ViktorG

    ViktorG [OP] Lexus/Toyota Master Tech

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    Last edited: Jan 9, 2024
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  8. Feb 3, 2021 at 8:34 PM
    #8
    ViktorG

    ViktorG [OP] Lexus/Toyota Master Tech

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    Last edited: Jan 9, 2024
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  9. Feb 4, 2021 at 4:40 PM
    #9
    Vizsla

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    Thanks for sharing Viktor, awesome info. Could the fuel feed be split to both rails and keep the crossover? Return through crossover?
     
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  10. Feb 4, 2021 at 5:45 PM
    #10
    TXTundra2722

    TXTundra2722 Pipe Hitters Union

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    This is a good question
    :popcorn:
     
  11. Feb 6, 2021 at 12:16 PM
    #11
    ViktorG

    ViktorG [OP] Lexus/Toyota Master Tech

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    I'll have a video coming up on the best way to set this fuel system up using stock rails. It is using an aftermarket FPR and dual feeding the rails from both sides.
     
  12. Feb 16, 2021 at 9:15 PM
    #12
    ViktorG

    ViktorG [OP] Lexus/Toyota Master Tech

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    Last edited: Jan 9, 2024
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  13. Mar 17, 2022 at 3:51 PM
    #13
    ViktorG

    ViktorG [OP] Lexus/Toyota Master Tech

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    Last edited: Jan 9, 2024
  14. Mar 17, 2022 at 4:17 PM
    #14
    Silver17

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    Cool test Viktor, thanks for sharing. At what horsepower do you think it’s beneficial to make any changes to the fuel system beyond a larger fuel pump and injectors? Looks like the feed lines are where the best improvements can be made, but are they really necessary for those of us running the smaller than standard pulleys on our Magnusons and Harrops? I have the 80mm for example. On your build I definitely see the importance.
     
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  15. Mar 17, 2022 at 7:55 PM
    #15
    ViktorG

    ViktorG [OP] Lexus/Toyota Master Tech

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    The most important part is the fuel pump.
    I have found the 325 lph one is pretty much maxed out on the stock setup.
    If you upgrade the pump to a 450 lph, the stock feed line is fine for a while, definitely enough for at least a stage 3 pulley and more.
     
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  16. Nov 8, 2022 at 2:18 PM
    #16
    kos221

    kos221 New Member

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    Sorry if these are dumb questions, but I am trying to understand what is real and what is fluff when it comes to the fuel system in a S/C Tundra. I was wondering if the stock fuel pressure regulator can get maxed out and cause restriction of fuel flow? Conversely, will the regulator keep constant pressure as long as the pump is pumping more fuel than the injectors are?

    In the 'Flow Testing The Complete Stock Toyota Tundra Fuel System' You use a Lexus pump that has very similar flow to the Toyota S/C pump at 196 LPH. It shows 46.5 PSI on the passenger rail with the stock crossover AND with the free-flowing crossover. The driver side rail actually dropped 1 PSI when the free flowing crossover line is used. To me, this might indicate the limits of the fuel pressure regulator have not been met. I assume this test was done with all injectors off the whole time. Why did the driver side rail drop 1 PSI?

    Now on to the 'Twin Pumps And Such' video, I noticed is that the flow rate increased from 310 LPH to 340 LPH or (10%) when all injectors were 100% on versus off. The pressure in the passenger rail decreased from 54.5 PSI to 44.5 PSI (19%) when all injectors were on versus off. Does this indicate that the regulator could not flow any more than 310 LPH @ 54.5 PSI. I am thinking that the limit of regulator was reached in that test since the fuel pressure was so much higher at the passenger rail.

    Can we assume that when all the injectors are off, the fuel pressure at the passenger rail is a result of what the pressure regulator commands?

    The passenger rail fuel pressure in the twin pump test with all (TRD 535cc?) injectors 100% ON was 44.5 PSI, 2 PSI lower than the single pump with all injectors OFF. Previously you showed those injectors to flow 257 LPH is it fair to assume about 83 LPH was left for the regulator in this case? I don't understand why the pressure was 2 PSI lower when there was plenty of return fuel.

    A 535cc/min injector at 100% = about 32.1 LPH and 8 injectors would get us to the 257 LPH figure you have. Since this is a 4 stroke, can I roughly assume the maximum theoretical consumption would be 1/2 of that (injector on for the entire exhaust and intake strokes, even then, wouldn't the fuel just pool up until the intake valve opens?). With this in mind, the 535cc injectors can consume 130 LPH. The TRD S/C fuel pump should leave a minimum of 66 LPH for the regulator to return to the tank.

    My math has to be wrong somewhere. Assuming there is no clogged filter or other restriction, I don't understand how folks can be running lean near maximum RPM, even if they have a slightly smaller pulley or long tube headers. Thanks for your patience in reading this everyone.
     
  17. Apr 4, 2023 at 11:48 AM
    #17
    e30cabrio

    e30cabrio I'm e30cabrio, I'm a modaholic

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    Did anyone save the details of parts needed to do this?
     
  18. Apr 4, 2023 at 11:49 AM
    #18
    M3Tundra-JK

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    I have screenshots somewhere in the General Supercharger thread of them.
     
  19. Apr 4, 2023 at 11:53 AM
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    M3Tundra-JK

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  20. Apr 4, 2023 at 11:57 AM
    #20
    armyoffoo

    armyoffoo Member

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    You need a 5/16 Y adapter for the feed and fuel injection hose

    Hose from feed hardline to Y adapter, from Y adapter to rear port on both rails, out from that FPR adapter on the passenger rail to one side port on your FPR, and out from the driver rail to the other side port on your FPR. Then hose from the bottom port on your FPR to the return hardline.
     
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  21. Apr 4, 2023 at 2:04 PM
    #21
    e30cabrio

    e30cabrio I'm e30cabrio, I'm a modaholic

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    Thanks! I got the pump on Amazon for 50 less coming Monday or Tuesday!
     
  22. Jan 9, 2024 at 7:30 PM
    #22
    ViktorG

    ViktorG [OP] Lexus/Toyota Master Tech

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  23. Jan 10, 2024 at 5:10 PM
    #23
    Jowett

    Jowett New Member

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    Good info here, thanks for taking the time and sharing.

    The flex fuel pump looks like the Lexus RC-F pump, which is also TI Auto/Walbro.
     
    Last edited: Jan 11, 2024
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