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TBI injectors HELP - 454 vs 350

This is a discussion on TBI injectors HELP - 454 vs 350 within the Performance forums, part of the General Discussion category; now whats the difference in the 454 TBI injectors? ive heard they are smaller than the 350, but run at ...

  1. #1
    Tbi-MAX
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    TBI injectors HELP - 454 vs 350


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    now whats the difference in the 454 TBI injectors?

    ive heard they are smaller than the 350, but run at a higher psi... I dont want that! (smaller)

    I want it to flow more than the 350 with the same psi... granted im still raising the psi...

    just would like to know what part number, or what year vehicle or whatever i need to tell them at autozone... thanks...

    what injectors in other words is going to feed my 383 the best??

  2. #2
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    Re: TBI injectors HELP - 454 vs 350

    http://www.fullsizechevy.com/forums/...t-numbers.html


    I ended up getting 46# injectors with my 454 TBI which is fine (better spray pattern) and with enough pressure will still fuel my engine ok.
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    Re: TBI injectors HELP - 454 vs 350

    running 68# cop injectors in a modified tbi with spacer from cfm-tech . running 12 1/2 psi on an adjustable regulator from extreme fi . feeds my .30 over 5.7 . i thought the 454 injectors were like 90# ?
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    Re: TBI injectors HELP - 454 vs 350

    Quote Originally Posted by bowtiejack
    i thought the 454 injectors were like 90# ?
    They are either 71 or 74#, I've seen both numbers stated as being a 454 injector. The 454 SS supposedly used a 90# injector. Then again the later 454s used a 46# injector at 30 psi which is what my 454 TBI has. A smaller injector can still deliver enough fuel, it just takes more pressure. The more pressure the finer the fuel spray is and better it can burn.
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    Re: TBI injectors HELP - 454 vs 350

    Well, 80 lb/hr was a 454 injector and 90 as well. So, GM #17112560 is a 80 lb/hr injector from the 91-93 454 TBI set at 12.5 psi and GM #17113080 is a 90 lb/hr injectors set at the larger pressure (23 psi) from 94-95 years.

    The 90ss used a 90 lb/hr but GM #17111784 and the 91/92/93up used a 80 lb/hr set. Both of those numbers we set at 12 psi.
    Last edited by YenkoST; 09-25-2007 at 08:20 PM.

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    Re: TBI injectors HELP - 454 vs 350

    I use the 90 lb/hr inj's at 15 psi for my setup, only because I didn't want to change the fuel pump. Otherwise I would have kept my stock 350 inj's and just cranked up the FP after I put a new pump in.
    I've had no issues at all with the 90's. THey work great, idle is great, passed emissions w/o egr and on a rough tune.
    It took a while for me to figure out the quirks (increased offset) but they work great.
    I have the PN 17113080 inj's
    Last edited by 91chevZ71; 09-26-2007 at 01:12 PM.
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    Tbi-MAX
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    Re: TBI injectors HELP - 454 vs 350

    thanks guys, alot of great post in this thread.. it is very confusing with all the different type of injectors, and the different part #s that are always changing!

    im looking for the 90 lbs for the earlier 90-93 tbi's rated at the low psi... im going to run them a good bit higher...

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    Re: TBI injectors HELP - 454 vs 350

    How hard are they to swap out? If going bigger when is it to big?

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    Re: TBI injectors HELP - 454 vs 350

    Quote Originally Posted by tabasco
    How hard are they to swap out? If going bigger when is it to big?
    Take the injector pod hat off and pry the injectors out of the injector pod body. Install new orings and screens on the new injectors and install them. The most time consuming part is scraping the gasket off the pod body and hat. Unless you have done some extensive mods to the engine you really don't need bigger injectors. Most simple bolt on mods can be compensated for with a slight increase in pressure.
    1995 Silverado - ported vortec heads, 4L80E, efans, LT4 Hot Cam, Rear disc brake conversion w/drilled and slotted rotors
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  10. #10
    Tbi-MAX
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    Re: TBI injectors HELP - 454 vs 350

    Quote Originally Posted by tabasco
    How hard are they to swap out? If going bigger when is it to big?
    its not hard at all, just 2 different types torx bits screws to seperate the pod itself... i normally just take off the entire tbi itself, its easier... along with a full tbi rebuild gasket set which runs about 30-35$ to assure NO leaks... cause it sucks, when you turn on the ON position and fuel sprays like a hydrant all over the place.... especially with high psi setups...

    im getting a great deal on some 90#s. but im still going to have to get on the dyno with the 350s for now at a high psi...

 

 

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