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  • only for the pros

    [img]{SMILIES_PATH}/icon_question.gif[/img]

    does anyone know if the base walbro pump (not highpressure version) will be good enough to support 8psi with 290cc/min injectors.

    someone has told me that i will have to use the HP version if pressure gets up to 100psi. i've went to a graph and it looks like pressure is only 10gph around 80psi (translaters to around 60lbs/hr), but i'm not sure i'll need that much pressure in trying to make the 290's flow enough for 8psi (around 210hp)

    what do you think?
    -Conrad<br /><br /><br />Pioneers just end up with a bunch of arrows sticking out of their backs.

  • #2
    YOu can have injectors stick closed at fuel pressures higher then around 70 psi...plus most injectors don't really have an increase in flow past the 65-70psi range.
    -6S Resident Mechanical Forensics member #001.
    1995 SC2 Turbo 3.6L DOHC, 6sp manual, Ford 8.8 rearend running on MS3x.
    1998 F-250 5.4L triton...stock.

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    • #3
      Stock pump is more than adequate for 8psi and 290cc injectors.

      Joe
      1993 VR R1- 405 whp/330 ft/lbs tq (my toy)<br />1993 Saturn SLx turbo (my other toy)<br />2008 PPW 350z with an Amuse kit and a lot of other stuff (my 3rd toy)<br />2006 Evo IX MR SE intake, exhaust... (my DD)

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      • #4
        Originally posted by onemeansaturn
        Stock pump is more than adequate for 8psi and 290cc injectors.

        Joe
        sparing it is not a 97sc.

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        • #5
          Why is that Jayson? I also need to add I don't mean that 290cc injectors are big enough for 8 psi or anything because I'm not sure about that.

          Joe
          1993 VR R1- 405 whp/330 ft/lbs tq (my toy)<br />1993 Saturn SLx turbo (my other toy)<br />2008 PPW 350z with an Amuse kit and a lot of other stuff (my 3rd toy)<br />2006 Evo IX MR SE intake, exhaust... (my DD)

          Comment


          • #6
            28lb/hr at 8psi wouldbe aboutthe max or slighly lean on a 1.9l. If yo have an eco, then go bigger, at least 30lb/hr.

            And 97 fuel pump = teh sucks because they just sucked. They go bad all the time. Theyjust can't pump alot and some times take for ever to build pressure up just to start the car.
            -6S Resident Mechanical Forensics member #001.
            1995 SC2 Turbo 3.6L DOHC, 6sp manual, Ford 8.8 rearend running on MS3x.
            1998 F-250 5.4L triton...stock.

            Comment


            • #7
              Ahhh. That's right. I did read about the 97 dealyos on the tsn tech article a while back.

              joe
              1993 VR R1- 405 whp/330 ft/lbs tq (my toy)<br />1993 Saturn SLx turbo (my other toy)<br />2008 PPW 350z with an Amuse kit and a lot of other stuff (my 3rd toy)<br />2006 Evo IX MR SE intake, exhaust... (my DD)

              Comment


              • #8
                Originally posted by TURRRBOOO
                28lb/hr at 8psi wouldbe aboutthe max or slighly lean on a 1.9l. If yo have an eco, then go bigger, at least 30lb/hr.

                And 97 fuel pump = teh sucks because they just sucked. They go bad all the time. Theyjust can't pump alot and some times take for ever to build pressure up just to start the car.
                i can tell u that from experience i have to go though that everytiume i start my car
                <br /><br />

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                • #9
                  My pump has been [img]{SMILIES_PATH}/cool.gif[/img] to me.
                  07 Redline w/ stuff.<br /><br />89 Civic hatch w/o stuff.<br /><br />96 SL2 that dont need stuff.

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                  • #10
                    Originally posted by SpoolinSc2
                    Originally posted by onemeansaturn
                    Stock pump is more than adequate for 8psi and 290cc injectors.

                    Joe
                    sparing it is not a 97sc.

                    hey it wasnt limited to sc only though, and i also found like a tsb that it was spread through 96-98 years. my sl2 pump took a crap on me.

                    now that pump should do fine. and about the injectors flowing enough, here is some math and no one get mad, its just the math on it...........

                    (4) 28# injectors=149.2hp capability at 43.5 psi

                    pressure adjustment from 43.5 to 55=326cc, 31#

                    (4) 31# injectors=165.2hp capability at 55 psi

                    both times were run at a brake specific fuel consumption of .60 and injector duty cycle at 80%. NOW REMEMBER IT WAS THE MATH!!! this can be bent to work out. but the problem is, you can just say 8psi will give you 210hp. its better to go a bit bigger so you know your not killing the injectors to work. 210hp the math brought up 35# injectors at 55 psi with bsfc of .60 and injector cycle at 80%.

                    also whats your tuning in this?
                    Ian---The Fat Ass

                    1995 SL2-High compression engine FOR SALE
                    2010 Chevy Cobalt SS- tuned with plenty of goodness
                    2002 SC2-New daily
                    2017 Kawasaki Ninja 650 KRT- got a stupid deal
                    2003 Ford Taurus SES- free daily beater

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                    • #11
                      i replaced my 97 fuel pump with the walbro because it kept dropping fuel pressure at wide open throttle and under spray. no more problems.
                      2007 chevy classic 2500hd 4x4 duramax
                      1996 383 lt1 auto trans am
                      1995 sl1. single cam of fury
                      1995 jeep wrangler lifted 4x4 4.0
                      1995 ford explorer 4x4

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                      • #12
                        saturnspeed12,

                        now thats the kind of answer i'm looking for. thank you!

                        i'm trying to keep the size of the injector big enough to cover the 210hp at 8psi (or so, i know its not exact due to many things)

                        but,

                        i'm also trying to keep it small enough so the stock pcm will not have too much trouble idling and off boost or part throttle response.

                        so, in your best educated guess, what fuel pressure would you say the 290cc/min injectors would need to be taken to to cover my 8psi goal or 210~ hp goal? i won't hold you to it and yes, i understand why you keep saying 'its just the math'.

                        for 'tuning' believe it or not, i'm going to test the theory that you can't do something like this and get it 'close enough' by using the begi regulator, 290cc/min injectors and the walbro pump. no other tuning is being used.

                        again, i'm keeping injectors small enough to keep startup and idle okay while using upped fuel pressure to cover the span for the 8psi.

                        im running the t-too small stock mitsu turbo and smic.

                        i'll let everyone know how it goes.
                        -Conrad<br /><br /><br />Pioneers just end up with a bunch of arrows sticking out of their backs.

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                        • #13
                          have lean spool errr I mean good day.
                          07 Redline w/ stuff.<br /><br />89 Civic hatch w/o stuff.<br /><br />96 SL2 that dont need stuff.

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                          • #14
                            yeah, i'm hoping the begi with the onset of gain will clear up the lean window there from vacuum to boost transition...i'll be fine.
                            -Conrad<br /><br /><br />Pioneers just end up with a bunch of arrows sticking out of their backs.

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                            • #15
                              spool isnt vacuum to boost. spool is atmo to boost.
                              07 Redline w/ stuff.<br /><br />89 Civic hatch w/o stuff.<br /><br />96 SL2 that dont need stuff.

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