Results 1 to 13 of 13

what size injectors should I run?

This is a discussion on what size injectors should I run? within the LT1 forums, part of the Vehicle Specific category; I have a '94 z28 a4 with lt4 hot cam, 1.6rr's, moroso cai, hooker long tubes, off road y-pipe, hooker ...

  1. #1
    Junior Member
    Join Date
    Aug 2005
    Location
    south bend, IN
    Age
    46
    Posts
    7

    red
    1994 camaro z28

    Question what size injectors should I run?

    I have a '94 z28 a4 with lt4 hot cam, 1.6rr's, moroso cai, hooker long tubes, off road y-pipe, hooker aero chamber cat back, and a tci 2800 stall with a mad z28 tune. I have a stock injector that is stuck open and am going to replace all 8 of them. My question is should I put another set of 24lb injectors in it, or would I actually gain enough horse power to justify going to 30lb injectors and have ian retune it for those injectors? Thanks.

  2. #2
    Junior Member
    Join Date
    Aug 2006
    Location
    brew city
    Age
    41
    Posts
    18

    black
    96 impala

    i would get some 30's you are surely close to maxing out stock injectors with what you are running.

  3. #3
    Pathelogical Liar BlackLT1Z28's Avatar
    Join Date
    Aug 2006
    Location
    Missouri
    Age
    30
    Posts
    1,476

    Black
    94 Camaro Z28

    Do you plan on adding any more mods? Like heads, or nitrous, or turbo/supercharger? If so, I'd say yes to the bigger injectors and tune them down until you need the extra fuel after the extra mods.
    If you don't plan on adding any more mods, I'd say the 24lb/hr should be fine for what you have. But I'm no expert on fuel injectors or fuel systems.

  4. #4
    Member
    Join Date
    Aug 2006
    Location
    NC
    Posts
    258

    mystic
    95 LS, yes it says LS

    I would go with the 30s. You can have your ECU tuned for it. Plus if you plan on doing more mods then you won't have to redo your injectors again.

  5. #5
    Junior Member
    Join Date
    Aug 2006
    Location
    brew city
    Age
    41
    Posts
    18

    black
    96 impala

    Quote Originally Posted by BlackLT1Z28 View Post
    Do you plan on adding any more mods? Like heads, or nitrous, or turbo/supercharger? If so, I'd say yes to the bigger injectors and tune them down until you need the extra fuel after the extra mods.
    If you don't plan on adding any more mods, I'd say the 24lb/hr should be fine for what you have. But I'm no expert on fuel injectors or fuel systems.
    i would guess with the cam and exhaust he is close to 80% DC on the stockers,hell with a stock b-body camshaft i would see 85% with my combo.....
    he has gone this far,its safe to say the mod bug has bitten,its not likely the car will be put back to stock from here.
    just my .02

  6. #6
    Pathelogical Liar BlackLT1Z28's Avatar
    Join Date
    Aug 2006
    Location
    Missouri
    Age
    30
    Posts
    1,476

    Black
    94 Camaro Z28

    Quote Originally Posted by juicedimpss View Post
    i would guess with the cam and exhaust he is close to 80% DC on the stockers,hell with a stock b-body camshaft i would see 85% with my combo.....
    he has gone this far,its safe to say the mod bug has bitten,its not likely the car will be put back to stock from here.
    just my .02
    Well, the only reason for bigger injectors would be for the radical mods, like forced induction or bigger heads.

  7. #7
    Junior Member
    Join Date
    Aug 2006
    Location
    brew city
    Age
    41
    Posts
    18

    black
    96 impala

    Quote Originally Posted by BlackLT1Z28 View Post
    Well, the only reason for bigger injectors would be for the radical mods, like forced induction or bigger heads.
    thats true,and with his current mods,i would guess it wont be long and he will be upgrading the heads.

  8. #8
    Pathelogical Liar BlackLT1Z28's Avatar
    Join Date
    Aug 2006
    Location
    Missouri
    Age
    30
    Posts
    1,476

    Black
    94 Camaro Z28

    I was just saying that if he didn't plan on any more mods, the 24's would be fine, but if he is going with the bigger stuff, I agree that he should upgrade the injectors now so he won't have to do them later.

  9. #9
    LT1KING GOODZ/BADZ's Avatar
    Join Date
    Nov 2005
    Location
    Fontana, Ca.
    Age
    37
    Posts
    127

    Black/Black
    96 Vert Z28-RIP/94 TT Z28

    I agree with BLACKLT1Z28, if your gonna stay with stock heads and naturally aspirated then the stock injectors are just fine. If you plan on spraying or getting forced induction or even doing some bigger heads than yes you should go ahead and invest in the larger injectors. Keep in mind though that with forced induction your going to need larger than 30lb injectors so you could find yourself buying injectors again down the road.

  10. #10
    Junior Member
    Join Date
    Aug 2005
    Location
    south bend, IN
    Age
    46
    Posts
    7

    red
    1994 camaro z28

    So if I go with venom or FRPP 30 lb injectors, I still need to have madz28 reflash the ecm for them, correct? I am rather new to the GMs and with the 5.0 mustangs I have always had The mass air meter had to be recalibrated for injector size changes over a certain amount.

  11. #11
    Pathelogical Liar BlackLT1Z28's Avatar
    Join Date
    Aug 2006
    Location
    Missouri
    Age
    30
    Posts
    1,476

    Black
    94 Camaro Z28

    Yes, you will need to have the ECM reflashed for the larger injectors. Unless you want to start shooting fireballs out of the exhaust from running way to rich.

  12. #12
    Hark_Z
    Guest
    get some 30#'s

  13. #13
    Member koolaid_kid's Avatar
    Join Date
    Sep 2005
    Location
    Indianapolis
    Posts
    209

    Arrest Me Red
    1997 Formula

    The thing is, you can tune the 30s down and run them now. If you mod again, you can't tune the 24s up. I learned this lesson, which is why I have a set of 36s just laying around the house.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Help: what size injectors..need help
    By badta98 in forum External Engine
    Replies: 1
    Last Post: 05-21-2011, 05:17 AM
  2. Question: Which size injectors should I get for cam ls1? 48?
    By allbaugh_04 in forum General Help
    Replies: 34
    Last Post: 04-29-2010, 08:16 AM
  3. injectors what size?
    By lilicedout24 in forum External Engine
    Replies: 1
    Last Post: 12-24-2005, 02:58 PM
  4. what size injectors?on set up
    By lilicedout24 in forum Internal Engine
    Replies: 14
    Last Post: 12-19-2005, 11:05 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •