Page 1 of 2 12 LastLast
Results 1 to 10 of 12

Thread: injector flow rates

  1. #1
    Junior Member
    Join Date
    Apr 2010
    Posts
    13

    Default injector flow rates

    im doing a LS2 conversion in my factory LS1 car
    what injector flow rates do I use
    can I just copy them out of a 6L tune
    or I was told find the % difference between the 28lb and 39lb and add that percent to the current flow rates

  2. #2
    Lifetime Member
    Join Date
    Aug 2010
    Posts
    1,934

    Default

    Hello GMMAD,

    As long as your LS1 car is using a returnless fuel system, then Yes - copy (or copy and extrapolate) the values from the “Injectors” folder of the LS2 tune into the LS1 tune. This may involve coming up with “best fit” values here and there.

    Also, confirm the MAP and MAF values - adjust as is necessary. Don’t forget to adjust the cylinder volume - to reflect the engine change.


    Regards,
    Taz

  3. #3
    Junior Member
    Join Date
    Apr 2010
    Posts
    13

    Default

    do I just copy the flow rate or others too
    how do I adjust the cylinder volume...its not letting me change it for 708

  4. #4
    Lifetime Member
    Join Date
    Aug 2010
    Posts
    1,934

    Default

    If you have opened the tuning file as “read only” the software won’t allow changes until you save the file to a new file name. Alternatively, if you have recently downloaded the software, and have yet to enter your licence information, the software will be running in “Demo mode” and will not allow you to save changes.

    I find the best approach is to open both tune files simultaneously and compare each cell / table one at a time. (You can have the tuning software open multiple times). If the table format (X & Y axis) are the same - straight copy and paste. If not, take a look at the values / ranges and use a “best fit” approach.

    Cylinder volume for a 6.0 L is 750 cc if memory serves. Also, in post #2 above I forgot to mention you also need to change the knock sensor type (LS1 to LS2) and values.

    On the road for the day, no access to the tuning software - responses are from memory, so always double check. Just trying to point you in the right direction.


    Regards,
    Taz

  5. #5
    Junior Member
    Join Date
    Apr 2010
    Posts
    13

    Default

    ok I figured the cylinder volume....it says it was 708.2 in the ls2 file I was looking at
    but came up with 745 when I worked it out
    im using LS1 knock sensors ...so I dont have to touch that?
    in the LS2 file there is allot off extra parameters compared to the LS1 file im having trouble with which things to change
    and I cant find the map section in the LS1 file(mafless tune so dont need to touch MAF)

  6. #6
    Lifetime Member
    Join Date
    Aug 2010
    Posts
    1,934

    Default

    From memory MAP parameters should be in the Engine Diagnostics folder - MAP has its own subfolder I believe.

    On the injector changes – take your time, look carefully, only change the parameters of which you are certain.

    Post your tunes if wish direct feedback.


    Regards,
    Taz

  7. #7
    Junior Member SirNemesis's Avatar
    Join Date
    Dec 2007
    Posts
    24

    Default

    These are the injector settings I used with 39LB L76 injectors, which I believe are the same as the ones you are dealing with.

    L76 Injectors.tun
    1985 Volvo 240 || LS2 || 4L80e || S488 Turbo

  8. #8
    Junior Member
    Join Date
    Apr 2010
    Posts
    13

    Default

    thats different to the rates on the VZ LS2 tune I have dont know why there both 39lb

  9. #9
    Junior Member SirNemesis's Avatar
    Join Date
    Dec 2007
    Posts
    24

    Default

    Are you sure the LS2 had 39lb injectors? I've just done some quick research and I'm finding mention of 33lb injectors.
    1985 Volvo 240 || LS2 || 4L80e || S488 Turbo

  10. #10
    Junior Member
    Join Date
    Apr 2010
    Posts
    13

    Default

    the tune I was looking at is a 05 LS2 so not shore if they had smaller 32lb injectors or not Ive never heard it before
    what tune did you get your flow rates from?

Page 1 of 2 12 LastLast

Similar Threads

  1. Injector Flow Rates
    By Biodiesel66 in forum Duramax 06 LLY / 06+ LBZ & LMM
    Replies: 4
    Last Post: October 22nd, 2010, 06:22 AM
  2. injector flow rates
    By 02sierra4x4 in forum Gen III V8 Specific
    Replies: 1
    Last Post: September 30th, 2009, 06:05 PM
  3. reprogram injector flow rates
    By sprouse99 in forum Tutorials
    Replies: 18
    Last Post: April 25th, 2009, 09:24 PM
  4. 44lb injector Flow rates?
    By lownslo in forum Gen III V8 Specific
    Replies: 0
    Last Post: April 14th, 2009, 01:01 AM
  5. Ls1--ls6 injector flow rates
    By tblu92 in forum Gen III V8 Specific
    Replies: 4
    Last Post: September 25th, 2008, 02:26 AM

Posting Permissions

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