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Will I need to upgrade injectors with a cam swap?

This is a discussion on Will I need to upgrade injectors with a cam swap? within the General Help forums, part of the LSx Technical Help Section category; Originally Posted by Hi-Po I think I mis read your post for a second. Thought you were asking if a ...

  1. #41
    Member qwik219d9's Avatar
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    silver
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    FP meter needle constantly moving?

    Quote Originally Posted by Hi-Po View Post
    I think I mis read your post for a second. Thought you were asking if a pressure guage would drop the FP. After re-reading I dont think you asked that.

    With the guage hooked up to the rail, It should be 58ish PSI and around 50ish PSI at WOT
    I still have a stock GM fuel pump.

    OK I was expecting to observe 58PSI at idel was'nt sure what to expect at WOT.

    ? if at WOT FP drops below 50PSI would this indicate a weakened fuel pump?

    is it normal for this FP to drop to 50PSI at WOT even w/ a Racetronics Fuel pump?

    ? so the FP meter needle will move frequently (changing reading determined by amount of throttle used?)

    now I'm anxious to connect the FP meter.

    Thanks I'm learning alot about fueling.
    Last edited by qwik219d9; 11-13-2009 at 04:55 AM.

  2. #42
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    SOM
    1998 T.A.

    And if you find a deal on the 30# red tops (Cobra) you will be fine as they are rated at 30#'s on a 3 bar(43.51 psi) fuel system but we run a 4 bar system so they flow 36#'s at 58psi....

    I see them all over the place at $100-$125 a set.
    Last edited by SOMbitch; 11-13-2009 at 01:55 PM. Reason: misspelled word

  3. #43
    LSX whore allbaugh_04's Avatar
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    So those ones on ebay are probably a really good buy then huh? They are plug and play right?

    I would just need a tune?

  4. #44
    Awaiting Activation lovedrvr's Avatar
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    i put a set of fast #36,after the cam swap.
    fixed my idle problem and my misfire problem.

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    Quote Originally Posted by allbaugh_04 View Post
    So those ones on ebay are probably a really good buy then huh? They are plug and play right?

    I would just need a tune?
    Yeah they are a good deal and yes the tune needs to be touched up. When I was modding my car 2 years ago they were $300+ new. I almost upgraded to Redtops but used everybody was getting $200 used so I just kept my 28#'s. Can't remember my duty cycle when tuned. I will ask RPM next time I talk to them......

  6. #46
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    Black
    2001 WS6 Trans Am

    I have been following this thread, as I am just about ready to install a custom ground LSM cam and have all assoc. hardware already purchased.. BUT,
    never considered swapping out the injectors.. ( I swap them out at around 150k on all of the 5.3 and 6.0 LS style motors on my work vans, HUGE DIFFERENCE, with new stock injectors )... So, I will go buy a set..
    However, I very anit-Ford ( no blue ovals in my collection, my wifes cars or my work vans and trucks ) SO, is there any other 42lb'ers than are plug-n-play other than the Ford green tops??? Hi-Po and others, what would you recomend?? No one ever answered about LS2 or Vette injectors...Anybody???

  7. #47
    LSX whore allbaugh_04's Avatar
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    I've heard the c5 ones will work, I might take the chance and bid on them.

  8. #48
    Veteran Hi-Po's Avatar
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    at anti ford. If you really dont want any Ford there are many options, for more money. FAST injectors would work fine. There are many companies the sell injectors. 36 #ers would work great. Also, the rail pressure on these GM cars is 58 PSI. Most injectors are rated at 43ish PSI.

  9. #49
    LSX whore allbaugh_04's Avatar
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    Hi-Po you ready to sell your 42lbers yet?

  10. #50
    Veteran Hi-Po's Avatar
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    Quote Originally Posted by allbaugh_04 View Post
    Hi-Po you ready to sell your 42lbers yet?
    Nah, sorry man When I start my next build, yes. If I do, You'll be the first I offer them to.

  11. #51
    LSX whore allbaugh_04's Avatar
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    I will tune it in April I bet, so what's your plans? I'm guessing you won't be building for a while...

    Also, can I buy that spring tool from you. I'll pay full price and you can refund some of my money when I ship it back to you...what you think?

  12. #52
    Veteran Hi-Po's Avatar
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    Quote Originally Posted by allbaugh_04 View Post
    I will tune it in April I bet, so what's your plans? I'm guessing you won't be building for a while...

    Also, can I buy that spring tool from you. I'll pay full price and you can refund some of my money when I ship it back to you...what you think?
    The plans have been a 370 + a F1A + stock 317's. The build is delayed until further job aspects start looking up.

    Yea, that sounds fine. Just let me know when you need to borrow it. Ill just charge you shipping.

  13. #53
    LSX whore allbaugh_04's Avatar
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    Ok thanks.

    Sounds like that will be a nice setup.

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