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Thread: Theoritical power from injectors

  1. #1
    Forum Member Grease Monkey bbaacchhyy's Avatar
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    Default Theoritical power from injectors

    Hiya all,

    I have been offered some 550cc injectors from a fellow Supra owner that wants to concentrate on his turbo gas setup.

    They have had only 2 tankfuls of petrol through them, and there is a thought that one of them leaned out for a reason (unknown yet) during some tuning which led to the death of a N/A 7M that was turboed at about 15psi.

    They are apparently ND's and he wants $300 for them. The plan is to eventually use them on the 7M to get to my figure of between 200 and 250 rwkW.

    According to the RC injector site, 550's are required to get to 250rwkW at 80% duty cycle and 45psi pressure - does this sound right ?

    And secondly, what sort of issue would cause an injector to go lean (presuming all things being equal and OK) during a power run ?

    Is the price of $300 a good deal ? i.e. too good a deal to let go ?

    Cheers

    Michael B
    '84 MA61 with 7M-GTE
    Now 5sp, 5 stud,17x8" Ray's, big assed brakes and decent IC
    Better turbo in the wings as well as MAFT !!!!

  2. #2
    Current UZA80 owner Chief Engine Builder JustCallMeOrlando's Avatar
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    Default Re: Theoritical power from injectors

    IIRC, Glen was using 550cc injectors to make his 340rwkw+. I would've thought the 430cc 7MGTE injectors would be capable of the power level you're after. I hope so anyway, because I have a set of them now
    Teh UZA80 - Project Century - Remotely p00'd by association

  3. #3
    MR 18RG Chief Engine Builder The Witzl's Avatar
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    Default Re: Theoritical power from injectors

    $300 is a good deal mate - grab em.

    Yes, 550cc/min x 6 cylinder is capable of that power JCMF... with a rising rate FPR and around 90% d.c.
    ...... butt scratcher?!


  4. #4
    Forum Member Grease Monkey bbaacchhyy's Avatar
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    Default Re: Theoritical power from injectors

    Cheers for that.

    Will have to see how I can stretch the budget around that.

    Cheers

    Michael B
    '84 MA61 with 7M-GTE
    Now 5sp, 5 stud,17x8" Ray's, big assed brakes and decent IC
    Better turbo in the wings as well as MAFT !!!!

  5. #5
    Forum Member Grease Monkey bbaacchhyy's Avatar
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    Default Re: Theoritical power from injectors

    Snaffled them for even less !!!



    Yet another thing to be installed on the other engine .........
    '84 MA61 with 7M-GTE
    Now 5sp, 5 stud,17x8" Ray's, big assed brakes and decent IC
    Better turbo in the wings as well as MAFT !!!!

  6. #6
    Toymods V8 Member Too Much Toyota CrUZida's Avatar
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    Default Re: Theoritical power from injectors

    550cc/5 = 110hp per injector
    *.85 duty cylce = 93.5hp per injector
    *6 cyls = 550hp+

    550hp at fly is 330+rwkw

    Even a set of 440's can do 250rwkw.

    And that is not taking the increase in fuel pressure into account.
    Peewee
    1985 MZ12 Soarer - 1UZ Powered
    2013 86 GTS

  7. #7
    Current UZA80 owner Chief Engine Builder JustCallMeOrlando's Avatar
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    Default Re: Theoritical power from injectors

    Isn't Josh using 7MGTE injectors for his 1GGTE?
    Teh UZA80 - Project Century - Remotely p00'd by association

  8. #8
    Toymods V8 Member Too Much Toyota CrUZida's Avatar
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    Default Re: Theoritical power from injectors

    Pretty sure yes.
    Peewee
    1985 MZ12 Soarer - 1UZ Powered
    2013 86 GTS

  9. #9
    Forum Member Grease Monkey bbaacchhyy's Avatar
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    Default Re: Theoritical power from injectors

    Quote Originally Posted by CrUZida
    550cc/5 = 110hp per injector
    *.85 duty cylce = 93.5hp per injector
    *6 cyls = 550hp+

    550hp at fly is 330+rwkw

    Even a set of 440's can do 250rwkw.

    And that is not taking the increase in fuel pressure into account.
    Thanks Andrew, just the confirmation that I was after. I was pretty sure that the 440's would be OK, but the big advantage 9apart from the cost) is that the MAFT can cope with different injector sizes without any issue.

    What do a good set of 440's go for these days ?

    Cheers

    Michael B
    '84 MA61 with 7M-GTE
    Now 5sp, 5 stud,17x8" Ray's, big assed brakes and decent IC
    Better turbo in the wings as well as MAFT !!!!

  10. #10
    Current UZA80 owner Chief Engine Builder JustCallMeOrlando's Avatar
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    Default Re: Theoritical power from injectors

    Depends where you look, they usually go for around $250 here, whereas I bought a set from the US for AU$91 including postage.
    Teh UZA80 - Project Century - Remotely p00'd by association

  11. #11
    Forum Member Grease Monkey bbaacchhyy's Avatar
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    Default Re: Theoritical power from injectors

    Quote Originally Posted by JustCallMeFrank
    Depends where you look, they usually go for around $250 here, whereas I bought a set from the US for AU$91 including postage.
    Got them (the 550's) for AUS $250, but the [price you got the 440's for was very good, especuially the way some yanks work out their postage rates !!!

    Cheers

    Michael B
    '84 MA61 with 7M-GTE
    Now 5sp, 5 stud,17x8" Ray's, big assed brakes and decent IC
    Better turbo in the wings as well as MAFT !!!!

  12. #12
    Current UZA80 owner Chief Engine Builder JustCallMeOrlando's Avatar
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    Default Re: Theoritical power from injectors

    The USPS kicks ass when it comes to getting stuff from the US. The dude was really good too, took a week and one day from buying them to having them in my hand.
    Teh UZA80 - Project Century - Remotely p00'd by association

  13. #13
    doctor ed Conversion King ed's Avatar
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    Default Re: Theoritical power from injectors

    my 440's cost me $180 off toymods with plugs and leads

    also - i wouldnt really use the fuel pressure reg as a way of squeezing more fuel out of the injector: the velocity flow within the injector needs to be considered, just get the correctly sized ones...
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  14. #14
    MR 18RG Chief Engine Builder The Witzl's Avatar
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    Default Re: Theoritical power from injectors

    also - i wouldnt really use the fuel pressure reg as a way of squeezing more fuel out of the injector: the velocity flow within the injector needs to be considered, just get the correctly sized ones...
    that is such an "all-motor" spaz's comment

    This is my personal understanding of the use of adjustable/rising rate FPRs on Turbo cars....

    The idea of an adjustable or rising rate FPR is more to maintain that velocity you are referring to. When you are moving close to 2 litres per minute with intake pressures above 2 bar, spray and flow velocity go right to p00town - so to get a good spray and fuel atomisation in such harsh conditions you put a little more pressure behind the injector and run it at a lower duty cycle....

    ... i havent come across people (other than retards) maxing out their injectors and then using an adjustable FPR to go further.
    ...... butt scratcher?!


  15. #15
    doctor ed Conversion King ed's Avatar
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    Default Re: Theoritical power from injectors

    oh yeah, totally agree with the concept of using rising rate reg to equalise pressure on the fuel rail with increasing pressure in the intake - thus providing the same differential pressure, and maintaining the injectors flow rate and internal velocities...

    cranking up the rail pressure to 45, 50, 60 psi simply to increase fuel delivery as some yankee's commonly do is just farkin stupid though
    ../delete/ban
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